Special rate and overseas allowances
Special-rate matches use OPM's official occupation, agency, geographic coverage, grade, and step data. DSSR calculations use official State Department schedules, but a published post or rate does not establish eligibility. Post differential and danger pay are treated as taxable FICA wages, but not retirement, TSP, or FEGLI basic pay. Verify authorization, expense eligibility, quarters group, family status, and taxable treatment with your agency. Use the manual entries for agency-confirmed SMA, TQSA, transfer, consumables, incentives, or other amounts that require facts this calculator does not collect; manual taxable entries affect estimated federal income tax but are not assumed to be FICA wages.