Who can I top up CPF for — what are the rules on direction (upwards vs sideways vs downwards)?

CPF Top-Up Rules: Direction and Limits

CPF top-ups for Singaporeans generally follow rules regarding direction (upwards, sideways, or downwards) based on the account type and the contributor's age and current balances. The primary goal of most top-ups is retirement savings (SA/RA) or healthcare savings (MA).

Upwards Top-Ups (To Higher Interest/Security Accounts)

• Voluntary Contributions to SA/RA: You can make voluntary contributions (VC) to your Special Account (SA) or Retirement Account (RA) up to the prevailing Enhanced Retirement Sum (ERS). For 2025, the ERS is SGD 426,000 (4x the Full Retirement Sum, FRS). Top-ups to SA/RA earn higher interest (4% guaranteed floor for 2025) and qualify for tax relief under the Retirement Sum Topping-Up Scheme (RSTU).
• RSTU Tax Relief Limit: The maximum annual RSTU relief is the lower of:
• The amount topped up.
• SGD 37,740 (Total CPF contribution cap for self-employed, or 37.74% of salary up to the prevailing ceiling, which is SGD 7,400/month in 2025).
• The amount needed to reach the ERS in your RA.
• SGD 8,000 (combined personal relief limit for top-ups to self and family members).

Sideways Transfers (Between Accounts)

• OA to RA Transfer (Permanent): After age 55, if you have excess funds in your Ordinary Account (OA) after your RA is filled to FRS, you can transfer OA savings to your RA to earn the higher 4% interest. This transfer is one-way and permanent, locking the funds into CPF LIFE payouts from age 65. (Note: For those aged 55+, excess SA money flows to OA, earning 1.5% less than the 4% RA rate).
• MA Overflow: Medisave contributions overflow sideways if the Basic Healthcare Sum (BHS) is hit. For 2025, BHS is SGD 75,500. Excess contributions flow first to the SA until FRS is met, and then to the OA.

Downwards Transfers (Not Generally Allowed)

CPF rules strictly prohibit downwards transfers (e.g., RA to OA, or SA to OA) unless mandated by specific events (like the SA closure at age 55, where excess SA flows to OA). Funds are generally locked into the respective accounts based on their intended purpose (housing/education for OA, retirement for SA/RA, healthcare for MA). Withdrawals are only permitted under specific conditions (e.g., age 55, property pledge, or withdrawal after age 65).

Sources: CPF Board guidelines on Retirement Sum Topping-Up Scheme (RSTU) and CPF Account Structure.