Employees of the World Bank, IMF, and similar Bretton Woods institutions are generally exempt from US Social Security and Medicare taxes on their institutional salaries, and many international organization staff based in Washington DC receive a tax adjustment allowance from their employer that partially compensates for the income tax they owe on their salary. Like UN employees, this means World Bank and IMF staff who are US citizens still owe US income tax on their salaries, but they do not accumulate US Social Security credits from that employment. The Staff Retirement Plan (SRP) at the World Bank is a defined benefit pension, and whether contributions and earnings are tax-deferred for US purposes depends on the specific legal status of the institution and IRS guidance on the particular plan. For US expat staff posted to country offices outside the US, the Foreign Earned Income Exclusion may apply to the portion of salary attributable to days worked in a qualifying foreign country, reducing US income tax. The interactions between institutional tax allowances, actual US tax liability, and the FEIE can be complex, and many World Bank and IMF employees work with advisors who specialize specifically in international organization taxation.