For CPF cash top-ups, the timing rule is straightforward: the top-up must be received by the CPF Board on or before 31 December of the year in order to qualify for tax relief in the corresponding Year of Assessment. For example, a cash top-up made by 31 December 2026 is eligible for relief in YA 2027 (which assesses income earned in 2026).
Because processing can take a little time, it is best not to leave top-ups to the final days of December – make them comfortably before the year-end so the contribution is received and recorded in time. Relief is granted automatically based on the records CPF transmits to IRAS, so you do not need to file a separate claim.
Keep in mind that the tax relief for cash top-ups under the Retirement Sum Topping-Up scheme (to your own and your family members' accounts) and for MediSave top-ups is subject to annual caps, and personal income tax relief is also subject to an overall relief cap. Topping up early in the year, rather than at the end, also means the funds start earning CPF interest sooner.
Apexia can help you plan the timing and amount of top-ups to make the most of the available relief.