Singapore's Central Provident Fund (CPF) is a mandatory social security savings scheme that covers retirement, housing, and healthcare costs, and US citizens employed in Singapore are typically required to contribute to it. The IRS treats CPF as a foreign pension plan for US tax purposes, and contributions — particularly employer contributions made on your behalf — may be treated as taxable compensation in the year they're made, rather than being deferred as they are in Singapore. There is no US-Singapore income tax treaty, so no treaty provision can shelter CPF contributions or earnings from current US taxation. The CPF accounts (Ordinary, Special, Medisave, and Retirement) must be reported on FBAR if their aggregate value contributes to the $10,000 threshold. The treatment of CPF is unsettled in some respects — there is limited IRS guidance on exactly how CPF should be treated — making professional advice particularly valuable for US citizens in Singapore.