Taxes and Deductions

US Citizen Payroll Withholding

Employees must complete federal and state withholding elections in GMS. To make or change withholding elections in GMS, click on the ‘Pay’ icon, and under ‘Action’,  select ‘Withholding Elections’. Please see detailed instructions in the GMS Onboarding manual.

Non-US Citizen Payroll Withholding

Non-US Citizens for tax purposes are not able to update tax withholding in GMS. Please complete the Georgetown University Nonresident Alien Tax Request Form to request changes to withholding.


Payroll Forms

Social Security Tax 

  • For 2021:
    • The social security tax rate is 6.2%
    • The social security wage base limit is $142,800

Medicare Tax

  • For 2021:
    • The Medicare tax rate is 1.45%.
    • There is no wage base limit for Medicare tax.
    • An additional tax of 0.9% is assessed on Medicare wages above $200,000.

Mileage Reimbursement

  • For 2020
    • 56 cents per mile per business miles driven