How may federal income tax be withheld from separation pay and accrued vacation wages paid at termination when identified separately on the employee's pay stub?

• A. using the aggregate method only
• B. using the prior 12 months' tax rate
• C. at the optional flat rate for all payouts at termination only
• D. at the optional flat rate or using the aggregate method

Answer: (D)

When separation pay and accrued vacation wages are paid at termination and shown separately on the employee’s pay stub, federal income tax withholding can be handled using either of two approaches. You can apply the optional flat rate method for supplemental wages, or you can use the aggregate method that treats the payment as part of regular wages for withholding purposes.

The optional flat rate method provides a simple, consistent percentage withholding on the supplemental payoff, regardless of the employee’s regular tax situation. The aggregate method, on the other hand, combines the termination payments with the employee’s other wages and calculates withholding as if it were part of the usual payroll period, using the standard wage-tax tables and the employee’s withholding allowances.

Thus, either approach is acceptable when the payments are identified separately, giving the employer flexibility to choose the method that best matches payroll practice or the employee’s situation. The other options don’t fit because there isn’t a requirement to use only one method, and the prior-year rate approach isn’t a standard method for withholding these separate termination payments.