The flat rate method of withholding on supplemental wages
may be used if income taxes have been withheld from the regular wages of
the employee. Consequently, if income taxes have been withheld from an
employee's regular wages, an agency may use the flat rate method to
determine the correct amount of income tax to be withheld with respect
to the loan payment. The resulting employment taxes may be withheld from
either the employee's regular wages, the loan repayment, or a separate
tax payment made by the employee.
This answer was provided by the Internal Revenue Service (IRS). For further guidance/clarification on this issue, agency representatives may contact IRS (Federal, State and Local Governments) at (202) 283-9665.
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