Federal Income Tax Withholding

The 2017 Tax Cuts and Jobs Act made major revisions that affected taxpayer withholding. Due to changes in the law, personal exemptions are no longer a central feature of the tax code. The Internal Revenue Service (IRS) updated Form W-4, Employee’s Withholding Allowance Certificate, to reflect these changes. Employees who have submitted Form W-4 in any year before 2019 or earlier are not required to complete a new form, and USPS® will continue to compute withholding based on information from the employee’s most recently submitted Form W-4.

For employees who do submit a revised Form W-4 from 2020 or later, withholding will be based on expected filing status and standard deduction for the year. Employees can also choose to have qualified children and other dependents, multiple jobs or spouse works, and other income and deductions reflected in their withholding. For further information about withholding calculations, refer to IRS publication 15t (see page 10) at

Contributions made by employees to the following programs continue to be treated as pretax monies for federal tax computations:

n Commuter Program (CPP) up to the transit/parking pretax limits.

n Federal Employees Dental and Vision Insurance Program (FEDVIP).

n Health Benefits (HB):

n Federal Employees Health Benefits (FEHB), unless the employee declined the pre-tax benefit.

n USPS Health Benefits (USPS HB), only if the employee opted for pretax contributions.

n Flexible Spending Accounts (FSA).

n Health Savings Account (HSA).

n Traditional Thrift Savings Plan (TSP).

Regardless of whether employees have completed a revised 2020 Form W-4, they are encouraged to use the resources available at and complete a “paycheck checkup” using the Tax Withholding Estimator (see