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The Internal Revenue Service is looking toward automated solutions to cover the recent workforce reductions implemented by the Trump Administration, Department of the Treasury Secretary Bessent told a House Appropriations subcommittee.

The Internal Revenue Service is looking toward automated solutions to cover the recent workforce reductions implemented by the Trump Administration, Department of the Treasury Secretary Bessent told a House Appropriations subcommittee.

During a May 6, 2025, oversight hearing of the House Appropriations Financial Services and General Government Subcommittee, Bessent framed the current employment level at the IRS as “bloated” and is using the workforce reduction as a means to partially justify the smaller budget the agency is looking for.

“We are just taking the IRS back to where it was before the IRA [Inflation Reduction Act] bill substantially bloated the personnel and the infrastructure,” he testified before the committee, adding that “a large number of employees” took the option for early retirement.

When pressed about how this could impact revenue collection activities, Bessent noted that the agency will be looking to use AI to help automate the process and maintain collection activities.

“I believe, through smarter IT, through this AI boom, that we can use that to enhance collections,” he said. “And I would expect that collections would continue to be very robust as they were this year.”

He also suggested that those hired from the supplemental funding from the IRA to enhance enforcement has not been effective as he pushed for more reliance on AI and other information technology resources.

There “is nothing that shows historically that by bringing in unseasoned collections agents … results in more collections or high-end collections,” Bessent said. “It would be like sending in a junior high school student to try to a college-level class.”

Another area he highlighted where automation will cover workforce reductions is in the processing of paper returns and other correspondence.

“Last year, the IRS spent approximately $450 million on paper processing, with nearly 6,500 full-time staff dedicated to the task,” he said. “Through policy changes and automation, Treasury aims to reduce this expense to under $20 million by the end of President Trump’s second term.”

Bessent’s testimony before the committee comes in the wake of a May 2, 2025, report from the Treasury Inspector General for Tax Administration that highlighted an 11-percent reduction in the IRS workforce as of February 2025. Of those who were separated from federal employment, 31 percent of revenue agents were separated, while 5 percent of information technology management are no longer with the agency.

When questioned about what the IRS will do to ensure an equitable distribution of enforcement action, Bessent stated that the agency is “reviewing the process of who is audited at the IRS. There’s a great deal of politicization of that, so we are trying to stop that, and we are also going to look at distribution of who is audited and why they are audited.”

Bessent also reiterated during the hearing his support of making the expiring provisions of the Tax Cuts and Jobs Act permanent.

By Gregory Twachtman, Washington News Editor

A taxpayer's passport may be denied or revoked for seriously deliquent tax debt only if the taxpayer's tax liability is legally enforceable. In a decision of first impression, the Tax Court held that its scope of review of the existence of seriously delinquent tax debt is de novo and the court may hear new evidence at trial in addition to the evidence in the IRS's administrative record.

A taxpayer's passport may be denied or revoked for seriously deliquent tax debt only if the taxpayer's tax liability is legally enforceable. In a decision of first impression, the Tax Court held that its scope of review of the existence of seriously delinquent tax debt is de novo and the court may hear new evidence at trial in addition to the evidence in the IRS's administrative record.

The IRS certified the taxpayer's tax liabilities as "seriously delinquent" in 2022. For a tax liability to be considered seriously delinquent, it must be legally enforceable under Code Sec. 7345(b).

The taxpayer's tax liabilities related to tax years 2005 through 2008 and were assessed between 2007 and 2010. The standard collection period for tax liabilities is ten years after assessment, meaning that the taxpayer's liabilities were uncollectible before 2022, unless an exception to the statute of limitations applied. The IRS asserted that the taxpayer's tax liabilities were reduced to judgment in a district court case in 2014, extending the collections period for 20 years from the date of the district court default judgment. The taxpayer maintained that he was never served in the district court case and the judgment in that suit was void.

The Tax Court held that its review of the IRS's certification of the taxpayer's tax debt is de novo, allowing for new evidence beyond the administrative record. A genuine issue of material fact existed whether the taxpayer was served in the district court suit. If not, his tax debts were not legally enforceable as of the 2022 certification, and the Tax Court would find the IRS's certification erroneous. The Tax Court therefore denied the IRS's motion for summary judgment and ordered a trial.

A. Garcia Jr., 164 TC No. 8, Dec. 62,658

The IRS has reminded taxpayers that disaster preparation season is kicking off soon with National Wildfire Awareness Month in May and National Hurricane Preparedness Week between May 4 and 10. Disasters impact individuals and businesses, making year-round preparation crucial. 

The IRS has reminded taxpayers that disaster preparation season is kicking off soon with National Wildfire Awareness Month in May and National Hurricane Preparedness Week between May 4 and 10. Disasters impact individuals and businesses, making year-round preparation crucial. In 2025, FEMA declared 12 major disasters across nine states due to storms, floods, and wildfires. Following are tips from the IRS to taxpayers to help ensure record protection:

• Store original documents like tax returns and birth certificates in a waterproof container;
• keep copies in a separate location or with someone trustworthy. Use flash drives for portable digital backups; and
• use a phone or other devices to record valuable items through photos or videos. This aids insurance or tax claims. IRS Publications 584 and 584-B help list personal or business property.

Further, reconstructing records after a disaster may be necessary for tax purposes, insurance or federal aid. Employers should ensure payroll providers have fiduciary bonds to protect against defaults, as disasters can affect timely federal tax deposits.

IR-2025-55

A decedent's estate was not allowed to deduct payments to his stepchildren as claims against the estate.

A decedent's estate was not allowed to deduct payments to his stepchildren as claims against the estate.

A prenuptial agreement between the decedent and his surviving spouse provided for, among other things, $3 million paid to the spouse's adult children in exchange for the spouse relinquishing other rights. Because the decedent did not amend his will to include the terms provided for in the agreement, the stepchildren sued the estate for payment. The tax court concluded that the payments to the stepchildren were not deductible claims against the estate because they were not "contracted bona fide" or "for an adequate and full consideration in money or money's worth" (R. Spizzirri Est., Dec. 62,171(M), TC Memo 2023-25).

The bona fide requirement prohibits the deduction of transfers that are testamentary in nature. The stepchildren were lineal descendants of the decedent's spouse and were considered family members. The payments were not contracted bona fide because the agreement did not occur in the ordinary course of business and was not free from donative intent. The decedent agreed to the payments to reduce the risk of a costly divorce. In addition, the decedent regularly gave money to at least one of his stepchildren during his life, which indicated his donative intent. The payments were related to the spouse's expectation of inheritance because they were contracted in exchange for her giving up her rights as a surviving spouse. As a results, the payments were not contracted bona fide under Reg. §20.2053-1(b)(2)(ii) and were not deductible as claims against the estate.

R.D. Spizzirri Est., CA-11

The IRS issued interim final regulations on user fees for the issuance of IRS Letter 627, also referred to as an estate tax closing letter. The text of the interim final regulations also serves as the text of proposed regulations.These regulations reduce the amount of the user fee imposed to $56.

The IRS issued interim final regulations on user fees for the issuance of IRS Letter 627, also referred to as an estate tax closing letter. The text of the interim final regulations also serves as the text of proposed regulations.These regulations reduce the amount of the user fee imposed to $56.

Background

In 2021, the Treasury and Service established a $67 user fee for issuing said estate tax closing letter. This figure was based on a 2019 cost model.

In 2023, the IRS conducted a biennial review on the same issue and determined the cost to be $56. The IRS calculates the overhead rate annually based on cost elements underlying the statement of net cost included in the IRS Annual Financial Statements, which are audited by the Government Accountability Office.

Current Rate

For this fee review, the fiscal year (FY) 2023 overhead rate, based on FY 2022 costs, 62.50 percent was used. The IRS determined that processing requests for estate tax closing letters required 9,250 staff hours annually. The average salary and benefits for both IR paybands conducting quality assurance reviews was multiplied by that IR payband’s percentage of processing time to arrive at the $95,460 total cost per FTE.

The Service stated that the $56 fee was not substantial enough to have a significant economic impact on any entities. This guidance does not include any federal mandate that may result in expenditures by state, local, or tribal governments, or by the private sector in excess of that threshold.

T.D. 10031

NPRM REG-107459-24

The Tax Court appropriately dismissed an individual's challenge to his seriously delinquent tax debt certification. The taxpayer argued that his passport was restricted because of that certification. However, the certification had been reversed months before the taxpayer filed this petition. Further, the State Department had not taken any action on the basis of the certification before the taxpayer filed his petition.

The Tax Court appropriately dismissed an individual's challenge to his seriously delinquent tax debt certification. The taxpayer argued that his passport was restricted because of that certification. However, the certification had been reversed months before the taxpayer filed this petition. Further, the State Department had not taken any action on the basis of the certification before the taxpayer filed his petition.

Additionally, the Tax Court correctly dismissed the taxpayer’s challenge to the notices of deficiency as untimely. The taxpayer filed his petition after the 90-day limitation under Code Sec. 6213(a) had passed. Finally, the taxpayer was liable for penalty under Code Sec. 6673(a)(1). The Tax Court did not abuse its discretion in concluding that the taxpayer presented classic tax protester rhetoric and submitted frivolous filings primarily for purposes of delay.

Affirming, per curiam, an unreported Tax Court opinion.

Z.H. Shaikh, CA-3

Gross income is taxed to the person who earns it by performing services, or who owns the property that generates the income. Under the assignment of income doctrine, a taxpayer cannot avoid tax liability by assigning a right to income to someone else. The doctrine is invoked, for example, for assignments to creditors, family members, charities, and controlled entities. Thus, the income is taxable to the person who earned it, even if the person assigns the income to another and never personally receives the income. The doctrine can apply to both individuals and corporations.

Gross income is taxed to the person who earns it by performing services, or who owns the property that generates the income. Under the assignment of income doctrine, a taxpayer cannot avoid tax liability by assigning a right to income to someone else. The doctrine is invoked, for example, for assignments to creditors, family members, charities, and controlled entities. Thus, the income is taxable to the person who earned it, even if the person assigns the income to another and never personally receives the income. The doctrine can apply to both individuals and corporations.

A taxpayer cannot assign income that has already accrued from the property the taxpayer owns, and cannot avoid liability for tax on that income by assigning it to another person or entity. This result often applies to interest, dividends, rent, royalties, and trust income. The doctrine applies when the taxpayer's right to income has ripened so that the receipt of income is practically certain to occur. Once a right to receive income has ripened, the taxpayer who earned it or otherwise created that right will be taxed on the income.

Similarly, under the anticipatory assignment of income doctrine, a taxpayer cannot shift tax liability by transferring property that is a fixed right to income. However, a taxpayer can assign future income by making an assignment of property for value or a bona fide gift of the underlying property.

The doctrine does not apply if a right to income is sold or exchanged for value. If a gift of income-producing property is made, income earned after the date of the gift is taxed to the donee of the gift. If a taxpayer assigns a claim to income that is contingent or uncertain, the assignee of the right is taxable on income that the assignee collects on the claim. If a taxpayer transfers appreciated property prior to a sale or exchange, the appreciation is income to the person owning the property at the time of the sale or exchange.

The mortgage interest deduction is widely used by the majority of individuals who itemize their deductions. In fact, the size of the average mortgage interest deduction alone persuades many taxpayers to itemize their deductions. It is not without cause, therefore, that two recent developments impacting the mortgage interest deserve being highlighted. These developments involve new reporting requirements designed to catch false or inflated deductions; and a case that effectively doubles the size of the mortgage interest deduction available to joint homeowners. But first, some basics.

The mortgage interest deduction is widely used by the majority of individuals who itemize their deductions. In fact, the size of the average mortgage interest deduction alone persuades many taxpayers to itemize their deductions. It is not without cause, therefore, that two recent developments impacting the mortgage interest deserve being highlighted. These developments involve new reporting requirements designed to catch false or inflated deductions; and a case that effectively doubles the size of the mortgage interest deduction available to joint homeowners. But first, some basics.

Mortgage Interest Deduction Ground Rules

Mortgage interest — or "qualified residence interest" — is deductible by individual homeowners. Qualified residence interest generally includes interest paid or accrued during the tax year on debt secured by either the taxpayer's principal residence or a second dwelling unit of the taxpayer to the extent it is considered to be used as a residence (a "qualified residence").

Qualified residence interest comprises amounts paid or incurred on acquisition indebtedness and home equity indebtedness. Acquisition indebtedness is debt that is both:

1. secured by a qualified residence, and
2. incurred in acquiring, constructing or substantially improving the residence.

Home equity indebtedness is any debt secured by a qualified residence that is not acquisition indebtedness to the extent of the difference between the amount of outstanding acquisition indebtedness and the fair market value of the qualified residence.

A qualified residence for purposes of the home mortgage interest deduction can be the principal residence of the taxpayer, and one other residence selected by the taxpayer. In other words, the deduction is limited to interest payments on two homes.

Qualified residence interest is subject to several dollar limitations:

• The total acquisition indebtedness (principal) on which qualified residence interest is deductible is limited to $1 million ($500,000 in the case of married individuals filing separately).
• The total amount of home equity indebtedness (principal) taken into account in calculating deductible qualified residence interest may not exceed $100,000 ($50,000 in the case of married individuals filing separately).

Information reporting. Mortgage service providers have been required to report only the following information to the IRS annually with respect to individual borrower:

• the name and address of the borrower;
• the amount of interest received for the calendar year of the report; and
• the amount of points received for the calendar year and whether the points were paid directly by the borrower.

The amount of interest received by a mortgage service provider is reported on Form 1098, Mortgage Interest Statement, to the IRS. Form 1098 must also be furnished by the mortgage service provider to the payor on or before January 31 of the year following the calendar year in which the mortgage interest is received.

More Detailed Form 1098 Coming

The 2015 Surface Transportation Act (aka the Highway bill), which was signed into law on July 31, 2015, will require that Form 1098, Mortgage Interest Statement, filed with the IRS and provided to homeowners, include information on:

1. the amount of outstanding principal of the mortgage as of the beginning of the calendar year,
2. the address of the property securing the mortgage, and
3. the loan origination date.

These items are in addition to the information that parties were already required to provide to the IRS and payors under existing law.

The Government Accountability Office (GAO) had expressed concern that the information reported on Form 1098 is insufficient to allow the IRS to enforce compliance with the deductibility requirements for qualified residence interest. This criticism has included in particular, but not limited to, the dollar limitations imposed on acquisition indebtedness and home equity indebtedness.

While the modifications are intended to boost compliance with the deductibility requirements for qualified residence interest, they also impose a new burden on mortgage service providers. To give mortgage service providers time to reprogram their systems, the additional reporting requirements apply to returns and statements required to be furnished after December 31, 2016.

Joint Ownership

Another major development impacting on some homeowners’ mortgage interest deduction also took place this summer. Reversing the Tax Court, a panel of the Court of Appeals for the Ninth Circuit has found that when multiple unmarried taxpayers co-own a qualifying residence, the debt limit provisions apply per taxpayer and not per residence (Voss, CA-9, August 7, 2015). The question was one of first impression in the Ninth Circuit, the court observed.

Background. The taxpayers, registered domestic partners, obtained a mortgage to purchase a house (the Rancho Mirage property). In 2002, the taxpayer refinanced and obtained a new mortgage. That same year, the taxpayers purchased another house (the Beverly Hills property) with a mortgage, which they subsequently refinanced and obtained a home equity line of credit totaling $300,000. The total average balance of the two mortgages and the line of credit during the tax years at issue was approximately $2.7 million.

Both taxpayers filed separate income tax returns. Each individual claimed home mortgage interest deductions for interest paid on the two mortgages and the home equity line of credit. The IRS calculated each taxpayer’s mortgage interest deduction by applying a limitation ratio to the total amount of mortgage interest that each petitioner paid in each taxable year. The limitation ratio was the same for both: $1.1 million ($1 million of home acquisition debt plus $100,000 of home equity debt) over the entire average balance, for each tax year, on the Beverly Hills mortgage, the Beverly Hills home equity line of credit, and the Rancho Mirage mortgage. The taxpayers challenged the IRS’s calculations but the Tax Court ruled in favor of the agency.

Court’s analysis. Code Sec. 163(h)(3), the court found, provides that interest on a qualified residence, by a special carve-out, is not considered "personal interest," which would otherwise be nondeductible by taxpayers who are not corporations. A qualified residence is the taxpayer’s principal residence and one other residence of the taxpayer which is selected by the taxpayer for the tax year and which is used by the taxpayer as a residence.

The court further found the Tax Code limits the aggregate amount treated as acquisition indebtedness for any period to $1 million and the aggregate amount treated as home equity indebtedness for any period to $100,000. In the case of a married individual filing a separate return, the debt limits are reduced to $500,000 and $50,000.

Looking at the language of the Tax code, the court found that the debt limit provisions apply per taxpayer and not per residence. There was no reason not to extend this treatment to unmarried co-owners, the court concluded. Thus, each of the homeowners were entitled to the $1 million limit.

Whether this holding will hold up in jurisdictions other than the Ninth Circuit (California and other western states, including Hawaii), and whether it will apply to joint ownership situations for vacation homes, for example, remains to be tested.

If you have any questions regarding how best to maximize your mortgage interest deduction, please do not hesitate to contact this office.

Many federal income taxes are paid from amounts that are withheld from payments to the taxpayer. For instance, amounts roughly equal to an employee's estimated tax liability are generally withheld from the employee's wages and paid over to the government by the employer. In contrast, estimated taxes are taxes that are paid throughout the year on income that is not subject to withholding. Individuals must make estimated tax payments if they are self-employed or their income derives from interest, dividends, investment gains, rents, alimony, or other funds that are not subject to withholding.

Many federal income taxes are paid from amounts that are withheld from payments to the taxpayer. For instance, amounts roughly equal to an employee's estimated tax liability are generally withheld from the employee's wages and paid over to the government by the employer. In contrast, estimated taxes are taxes that are paid throughout the year on income that is not subject to withholding. Individuals must make estimated tax payments if they are self-employed or their income derives from interest, dividends, investment gains, rents, alimony, or other funds that are not subject to withholding.

Estimated income tax payments are required from taxpayers who:

1. expect to owe at least $1,000 in tax for the year, after subtracting taxes that were paid through withholding and tax credits; and
2. expect that the amount of taxes to be paid during the year through other means will be less than the smaller of—

• 90% of the tax shown on the current year's tax return, or
• 100% of the tax shown on the previous year's return (the previous year's return must cover all 12 months). This 100-percent test increases to 110 percent if the taxpayer's AGI for the previous year exceeds $150,000.

U.S. citizens who have no tax liability for the current year are not required to make estimated tax payments.

Form 1040-ES. Taxpayers use Form 1040-ES to calculate, report and pay their estimated tax. The annual liability may be paid in quarterly installments that are due based upon the taxpayer's tax year. However, no payments are required until the taxpayer has income upon which tax will be owed. Taxpayers may also credit their overpayments from one year against the next year's estimated tax liability, rather than having them refunded.

Generally, the required installment is 25 percent of the required annual payment. However, a taxpayer who receives taxable income unevenly throughout the year can elect to pay either the required installment or an annualized income installment. The use of the annualized income installment method, provided on a worksheet contained in the instructions to Form 2210, Underpayment of Estimated Tax by Individuals and Fiduciaries, may reduce or eliminate any penalty for underpaid taxes.

Due Dates. For most individual taxpayers, the quarterly due dates for estimated tax payments are:

Penalties. A penalty generally applies when a taxpayer fails to make estimated tax payments, pays less than the required installment amount, or makes late payments. However, the IRS may waive the penalty if the underpayment was due to casualty, disaster or other unusual circumstances.

A business operated by two or more owners can elect to be taxed as a partnership by filing Form 8832, the Entity Classification Election form. A business is eligible to elect partnership status if it has two or more members and:

A business operated by two or more owners can elect to be taxed as a partnership by filing Form 8832, the Entity Classification Election form. A business is eligible to elect partnership status if it has two or more members and:

• is not registered as anything under state law,
• is a partnership, limited partnership, or limited liability partnership, or
• is a limited liability company.

Publicly traded businesses cannot elect to be treated as partnerships. They are automatically taxed as corporations.

Form 8832 allows a business to select its classification for tax purposes by checking the box on the form: partnership, corporation, or disregarded. If no check-the-box form is filed, the IRS will assume that the entity should be taxed as a partnership or disregarded as a separate entity. An LLC that makes no federal election will be taxed as a partnership if it has more than one member and disregarded if it has only one member. An LLC must make an affirmative election to be taxed as a corporation. The IRS language on Form 8832 uses the term "association" to describe an LLC taxed as a corporation.

Form 8832 has no particular due date. There is a space on the form (line 4) for the entity to note what date the election should take effect. The date named can be no earlier than 75 days before the form is filed, and no later than 12 months after the form is filed. It is most important to file Form 8832 within the first few months of operations if the entity desires a tax treatment that differs from the tax status the IRS will apply by default if no election is made.

A few businesses do not qualify to be partnerships for federal tax purposes. These are:

1. a business that is a corporation under state law,
2. a joint stock company (a corporation without limited liability),
3. an insurance company,
4. most banks,
5. an organization owned by a state or local government,
6. a tax-exempt organization
7. a real estate investment trust, or
8. a trust.

Although these businesses cannot be partnerships, they can be partners in a partnership (they can join together to form a partnership).

Of course, whether your business is best operated as a partnership, as a corporation or as another type of entity should not only be driven by short-term tax considerations. How you envision your business will develop over time, whether your business is asset or service intensive, and what personal financial stake you plan to take, among other factors, are all additional factors that should be considered.

The IRS expects to receive more than 150 million individual income tax returns this year and issue billions of dollars in refunds. That huge pool of refunds drives scam artists and criminals to steal taxpayer identities and claim fraudulent refunds. The IRS has many protections in place to discover false returns and refund claims, but taxpayers still need to be proactive.

The IRS expects to receive more than 150 million individual income tax returns this year and issue billions of dollars in refunds. That huge pool of refunds drives scam artists and criminals to steal taxpayer identities and claim fraudulent refunds. The IRS has many protections in place to discover false returns and refund claims, but taxpayers still need to be proactive.

Tax-related identity theft

Tax-related identity theft most often occurs when a criminal uses a stolen Social Security number to file a tax return claiming a fraudulent refund. Often, criminals will claim bogus tax credits or deductions to generate large refunds. Fraud is particularly prevalent for the earned income tax credit, residential energy credits and others. In many cases, the victims of tax-related identity theft only discover the crime when they file their genuine return with the IRS. By this time, all the taxpayer can do is to take steps to prevent a recurrence.

Being proactive

However, there are steps taxpayers can take to reduce the likelihood of being a victim of tax-related identity theft. Personal information must be kept confidential. This includes not only an individual's Social Security number (SSN) but other identification materials, such as bank and other financial account numbers, credit and debit card numbers, and medical and insurance information. Paper documents, including old tax returns if they were filed on paper returns, should be kept in a secure location. Documents that are no longer needed should be shredded.

Online information is especially vulnerable and should be protected by using firewalls, anti-spam/virus software, updating security patches and changing passwords frequently. Identity thieves are very skilled at leveraging whatever information they can find online to create a false tax return.

Impersonators

Criminals do not only steal a taxpayer's identity from documents. Telephone tax scams soared during the 2015 filing season. Indeed, a government watchdog reported that this year was a record high for telephone tax scams. These criminals impersonate IRS officials and threaten legal action unless a taxpayer immediately pays a purported tax debt. These criminals sound convincing when they call and use fake names and bogus IRS identification badge numbers. One sure sign of a telephone tax scam is a demand for payment by prepaid debit card. The IRS never demands payment using a prepaid debit card, nor does the IRS ask for credit or debit card numbers over the phone.

The IRS, the Treasury Inspector General for Tax Administration (TIGTA) and the Federal Tax Commission (FTC) are investigating telephone tax fraud. Individuals who have received these types of calls should alert the IRS, TIGTA or the FTC, even if they have not been victimized.

Tax-related identity theft is a time consuming process for victims so the best defense is a good offense. Please contact our office if you have any questions about tax-related identity theft.

An employer must withhold income taxes from compensation paid to common-law employees (but not from compensation paid to independent contractors). The amount withheld from an employee's wages is determined in part by the number of withholding exemptions and allowances the employee claims. Note that although the Tax Code and regulations distinguish between withholding exemptions and withholding allowances, the terms are interchangeable. The amount of reduction attributable to one withholding allowance is the same as that attributable to one withholding exemption. Form W-4 and most informal IRS publications refer to both as withholding allowances, probably to avoid confusion with the complete exemption from withholding for employees with no tax liability.

An employer must withhold income taxes from compensation paid to common-law employees (but not from compensation paid to independent contractors). The amount withheld from an employee's wages is determined in part by the number of withholding exemptions and allowances the employee claims. Note that although the Tax Code and regulations distinguish between "withholding exemptions" and "withholding allowances," the terms are interchangeable. The amount of reduction attributable to one withholding allowance is the same as that attributable to one withholding exemption. Form W-4 and most informal IRS publications refer to both as withholding allowances, probably to avoid confusion with the complete exemption from withholding for employees with no tax liability.

An employee may change the number of withholding exemptions and/or allowances she claims on Form W-4, Employee's Withholding Allowance Certificate. It is generally advisable for an employee to change his or her withholding so that it matches his or her projected federal tax liability as closely as possible. If an employer overwithholds through Form W-4 instructions, then the employee has essentially provided the IRS with an interest-free loan. If, on the other hand, the employer underwithholds, the employee could be liable for a large income tax bill at the end of the year, as well as interest and potential penalties.

How allowances affect withholding

For each exemption or allowance claimed, an amount equal to one personal exemption, prorated to the payroll period, is subtracted from the total amount of wages paid. This reduced amount, rather than the total wage amount, is subject to withholding. In other words, the personal exemption amount is $4,000 for 2015, meaning the prorated exemption amount for an employee receiving a biweekly paycheck is $153.85 ($4,000 divided by 26 paychecks per year) for 2015.

In addition, if an employee's expected income when offset by deductions and credits is low enough so that the employee will not have any income tax liability for the year, the employee may be able to claim a complete exemption from withholding.

Changing the amount withheld

Taxpayers may change the number of withholding allowances they claim based on their estimated and anticipated deductions, credits, and losses for the year.  For example, an employee who anticipates claiming a large number of itemized deductions and tax credits may wish to claim additional withholding allowances if the current number of withholding exemptions he is currently claiming for the year is too low and would result in overwithholding.

Withholding allowances are claimed on Form W-4, Employee's Withholding Allowance Certificate, with the withholding exemptions. An employer should have a Form W-4 on file for each employee. New employees generally must complete Form W-4 for their employer. Existing employees may update that Form W-4 at any time during the year, and should be encouraged to do so as early as possible in 2015 if they either owed significant taxes or received a large refund when filing their 2014 tax return.

The IRS provides an IRS Withholding Calculator at www.irs.gov/individuals that can help individuals to determine how many withholding allowances to claim on their Forms-W-4. In the alternative, employees can use the worksheets and tables that accompany the Form W-4 to compute the appropriate number of allowances.

Employers should note that a Form W-4 remains in effect until an employee provides a new one. If an employee does update her Form W-4, the employer should not adjust withholding for pay periods before the effective date of the new form. If an employee provides the employer with a Form W-4 that replaces an existing Form W-4, the employer should begin to withhold in accordance with the new Form W-4 no later than the start of the first payroll period ending on or after the 30th day from the date on which the employer received the replacement Form W-4.