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The Percentage-Withholding Method: How It Works


Employers are required to withhold federal income tax from all employees' wages unless the employee is exempt from federal income tax. The withholding amount is based on the employee's taxable wages, marital status and number of allowances stated on his or her W-4 form, combined with the withholding tax tables in IRS Publication 15-T.

Employers can calculate federal income tax withholding using either Publication 15-T's wage bracket method or its percentage method.

The wage bracket method is the most straightforward approach, as it tells you the exact amount to withhold based on the employee's taxable wages, marital status, number of allowances and payroll period. No calculations are needed.

However, this method stops at 10 allowances and limits the amount of wages that can be used to calculate withholding — which brings us to the percentage method.

How the Percentage Method Works

The percentage method has no wage or allowance limits. Therefore, you can use it if the employee's wages exceed the wage bracket's limit or if he or she has more than 10 allowances. This approach is more complex than the wage bracket method because it involves more calculations. First, you will need to determine the value of the employee's W-4 allowances. According to 2020 Publication 15-T, one allowance for a weekly pay period is worth $83. For a biweekly pay period, the amount doubles to $165. For a semimonthly pay period, one allowance comes to $ $179, and for a monthly pay period, one allowance comes to $ $358.

So if an unmarried employee earns taxable wages of $1,700 biweekly and has two allowances, the total allowance amount would be $330. To arrive at the amount subject to withholding, subtract $330 from $1,700, which leaves $1,370.

Per 2020 Publication 15-T's percentage method table (page 58 ), this employee would be taxed on wages over $526 at 12 percent plus $38.

Here's a breakdown of the calculation:

$1,370 - $526 = $844 x 12 percent + $38 = biweekly tax withholding of $139.28

Note the above calculation assumes you are using a W-4 completed by an employee from 2019 or earlier. The 2020 W-4 has been re-designed and if an employee has submitted a W-4 for 2020 or later, you'll need to consult worksheet 1 on page 5 of publication 15-T.

The IRS allows certain rounding procedures for figuring federal income tax withholding, such as rounding the tax to the nearest dollar. (Consult Publication 15-T for details on this.) If you decide to use rounding, apply it in a consistent manner.

Also important is checking the employee's W-4 to see if he or she requested an additional withholding amount, in which case you would need to add the extra amount to the withholding amount you obtained through the percentage method.

Payroll software does all withholding calculations for you, so you may never need to manually compute employees' federal income tax withholding via the percentage method. However, you should understand how the process works for your own knowledge or in case you are called upon to explain it.

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Our firm provides the information in this e-newsletter for general guidance only, and does not constitute the provision of legal advice, tax advice, accounting services, investment advice, or professional consulting of any kind. The information provided herein should not be used as a substitute for consultation with professional tax, accounting, legal, or other competent advisers. Before making any decision or taking any action, you should consult a professional adviser who has been provided with all pertinent facts relevant to your particular situation. Tax articles in this e-newsletter are not intended to be used, and cannot be used by any taxpayer, for the purpose of avoiding accuracy-related penalties that may be imposed on the taxpayer. The information is provided "as is," with no assurance or guarantee of completeness, accuracy, or timeliness of the information, and without warranty of any kind, express or implied, including but not limited to warranties of performance, merchantability, and fitness for a particular purpose.
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