For details, see Publication 519, U.S. Tax Guide for Aliens. Withholding certificate . If you give OPM a Form W-4P-A, ... File copy B of Form CSA 1099R with your return if any federal income tax was withheld. Withholding from Thrift Savings Plananbsp;...
|Title||:||Tax Guide to U.S. Civil Service Retirement Benefits|