There are two ways to put extra money into your Special Account (SA) before 55. You can add cash from your bank account, or you can make a CPF OA to SA transfer, shifting savings across from your Ordinary Account (OA). Both earn the higher SA interest rate. Only the cash top-up earns tax relief, and neither can be undone.
Here is how they compare.
Cash Top-Up or CPF OA to SA Transfer: Two Routes In
Both routes fall under CPF Board’s Retirement Sum Topping-Up Scheme.
| Cash top-up | OA-to-SA transfer | |
|---|---|---|
| Where the money comes from | Your bank account | Your own OA |
| Interest before | Whatever your bank pays | 2.5% a year (OA) |
| Interest after | 4% a year floor (SA) | 4% a year floor (SA) |
| Tax relief | Yes, up to S$8,000 a year for yourself | No |
| Limit below 55 | Up to the current Full Retirement Sum | Up to the current Full Retirement Sum |
| Can it be reversed? | No | No |
| What you give up | Cash in hand | OA money for housing or other OA uses |
The 4% floor on SA savings has been extended by the Government to 31 December 2027. The OA rate of 2.5% is the legislated minimum.
The Limit: The Full Retirement Sum
Below 55, the most you can add is the current Full Retirement Sum (FRS) minus what is already in your SA. Any SA savings you have withdrawn for investments and not yet fully sold also count against the limit.
The FRS is $220,400 in 2026 and $228,200 in 2027, according to CPF Board. The figure rises each January, so a member who has reached the limit usually gets a little more room the next year.
The limit applies only to top-ups and transfers. Your monthly contributions from work, and the interest on them, keep going into your SA even after it passes the FRS.
Your CPF Retirement dashboard shows your exact top-up limit.
What the Tax Relief Is Worth
IRAS allows up to $8,000 of relief a year for cash top-ups to your own accounts. That $8,000 is shared between your SA and your MediSave Account. A further $8,000 is available for cash top-ups to family members.
The tax you save is the relief multiplied by your marginal tax rate. Using the IRAS resident rates that apply from Year of Assessment 2024:
| Chargeable income band | Marginal rate | Tax saved on an $8,000 top-up |
|---|---|---|
| $30,001 to $40,000 | 3.5% | $280 |
| $40,001 to $80,000 | 7% | $560 |
| $80,001 to $120,000 | 11.5% | $920 |
| $120,001 to $160,000 | 15% | $1,200 |
| $160,001 to $200,000 | 18% | $1,440 |
This is an illustration. It assumes the whole $8,000 falls inside one band and that your total personal reliefs stay under the $80,000 overall cap.
Three conditions matter. Relief stops at the FRS. CPF Board must receive the money by 31 December for it to count in the next Year of Assessment. And relief is granted automatically from CPF’s records, so there is nothing to claim.
Our top-up tax relief calculator works out the saving for your income. The income tax calculator shows your marginal rate.
What Compounding Adds
The appeal of an early top-up is time. Here is what a single sum grows to at a constant 4% a year.
- $8,000 left for 10 years grows to about $11,800.
- $8,000 left for 20 years grows to about $17,500.
- $8,000 left for 25 years grows to about $21,300.
For a transfer, the gain is the gap between the two accounts. A sum of $20,000 left for 20 years grows to about $43,800 at 4%, against about $32,800 at 2.5%. The difference is roughly $11,000.
These figures are an illustration only, not a guarantee. They assume the 4% and 2.5% rates hold for the whole period and ignore extra interest. The 4% floor is confirmed only to the end of 2027, and CPF rates are reviewed every quarter.
Timing within the year has a small effect too. CPF Board says money received in one month starts earning interest the next month. An $8,000 top-up made in January earns about $290 in SA interest that year at 4%. The same top-up made in December earns none until the following year.
You can test your own figures with our CPF interest projector.
The short version: Cash top-ups to your SA earn tax relief of up to $8,000 a year. OA-to-SA transfers earn none but lift the interest rate on money already in CPF. Both stop at the FRS and both are permanent.
What You Give Up
The money is locked for retirement. SA savings cannot be used for a home loan or a downpayment. At 55 they move into your Retirement Account and are paid out as monthly income from 65.
Transfers shrink your housing fund. OA savings can pay for a home. Once moved to the SA, they cannot. A transfer made at 30 can be regretted at 35 when a flat comes up.
Cash top-ups reduce your buffer. Money in the bank can deal with a job loss or a hospital bill this year. Money in the SA cannot.
Rules can change. The SA now closes at 55, which was not the case before 2025. Interest floors, limits and ages are set by policy and are reviewed.
An illustrative case shows the tension. A 32-year-old with $60,000 in her OA plans to buy a resale flat in three years. Transferring $30,000 to her SA would lift the interest on that sum from 2.5% to 4%, about $450 more in the first year. It would also remove $30,000 from her downpayment for good. Whether that is worthwhile depends entirely on the flat.
Who Each Route Tends to Suit
A cash top-up tends to suit someone who pays tax at a meaningful rate, has a cash buffer, and has spare savings they will not need before retirement.
A transfer tends to suit someone whose housing is settled, with OA savings clearly beyond what any home loan will need.
Neither suits money you might need back. That includes funds for a first home, a planned career break or supporting family.
What To Do Next
- Check your top-up limit on the CPF Retirement dashboard.
- Work out the OA balance your current or future home needs before moving anything out of it.
- Estimate your tax saving with the calculators above, using last year’s Notice of Assessment for your income.
- If you are topping up for this year’s relief, make sure CPF Board receives the money by 31 December.
- Read our guide to every CPF strategy by age to see where top-ups fit among the alternatives.
