CPF Interest Growth Calculator Singapore: How Much Will Your CPF Grow?
Most Singaporeans think of CPF as money that is locked away — deducted every month, deposited into three accounts, and largely forgotten until retirement. But that framing misses something significant. CPF earns interest every year. On every dollar sitting in your OA, SA, and MediSave. Automatically. Without you doing anything.
Over 10, 20, or 30 years, that interest compounds quietly in the background — and for many people, it becomes one of the largest components of their final CPF balance. Not contributions. Not salary increments. Just interest doing what interest does, year after year.
The calculator below shows how your CPF balances may grow over time based on current CPF Board interest rates — including the extra interest most people do not factor into their planning.
CPF accounts earn the following base interest rates, set by the CPF Board: Ordinary Account (OA) earns 2.5% p.a., Special Account (SA), MediSave Account (MA), and Retirement Account (RA) each earn 4.0% p.a. In addition, a CPF interest bonus applies to the first portion of combined CPF balances — the exact structure depends on your age group. All figures are subject to CPF Board rules and may be reviewed periodically. (CPF Board: Earning attractive interest)
Calculate my CPF growth →What This Calculator Shows You
This calculator simulates how your CPF balances in OA, SA, and MediSave may grow year by year — applying the base CPF Board interest rates, the extra CPF interest bonus, and any monthly contributions you add. It also lets you model the impact of using OA for housing.
- Projected total CPF balance — after your chosen number of years, with interest compounded annually
- Final OA, SA, and MA balances — broken down individually to show how each account grows
- Total contributions vs total interest — what proportion of your final balance comes from money you put in versus interest the CPF system generated
- Extra interest earned — the additional amount from the CPF interest bonus (1% or 2% on qualifying balances), shown separately
- CPF growth chart — a year-by-year line showing total growth, contribution-only growth, and growth without extra interest for comparison
- OA housing deduction impact — optional: see how drawing down OA monthly for a mortgage affects long-term CPF growth
This calculator uses current CPF Board interest rates and simulates annual compounding. Actual CPF balances depend on your specific contribution history, the timing of withdrawals and transfers, CPF rule changes, and government policy decisions. Always verify your actual balances and projections with the CPF Board.
CPF Interest Rates Explained Simply
CPF accounts are not all equal. The OA earns a lower base rate than the other accounts — which is why money sitting in OA grows more slowly than money in SA, MA, or RA over time.
| CPF Account | Base Interest Rate | Primary Purpose |
|---|---|---|
| Ordinary Account (OA) | 2.5% p.a. | Housing (HDB), education, approved investments, insurance |
| Special Account (SA) | 4.0% p.a. | Retirement savings and CPF LIFE premiums |
| MediSave Account (MA) | 4.0% p.a. | Approved medical expenses and MediShield Life premiums |
| Retirement Account (RA) | 4.0% p.a. | Created at age 55 from OA and SA savings for retirement income |
Interest rates as published by CPF Board. OA interest rate is the higher of 2.5% or the 3-month average of major local banks’ savings rates. In recent years this has remained at 2.5%. SA, MA, and RA rates are the higher of 4% or the 12-month average yield of 10-year Singapore Government Securities plus 1%. These rates are reviewed periodically by CPF Board. (CPF Board interest rates)
The 1.5 percentage point difference between OA (2.5%) and SA/MA (4%) is significant over decades. On S$30,000 held in OA for 20 years with no withdrawals, you earn approximately S$20,000 in interest. The same S$30,000 held in SA for 20 years earns approximately S$36,000 in interest — nearly S$16,000 more. This gap is the foundation of the OA-to-SA transfer decision many Singaporeans face.
Extra CPF Interest — The Bonus Most People Underestimate
On top of the base rates, CPF members earn additional interest on a portion of their combined CPF balance. The structure depends on your age group, and it is applied differently for balances below and above age 55. (CPF Board: Extra interest)
Below Age 55
Members below age 55 earn an extra 1% per annum on the first S$60,000 of their combined CPF balance. However, only the first S$20,000 of the OA balance counts toward this limit — the remainder of the S$60,000 is filled by SA, then MediSave.
In practical terms: if you have S$50,000 in OA, only S$20,000 of that OA balance qualifies for the extra 1%. The remaining S$40,000 of the S$60,000 limit comes from SA and MediSave balances.
Age 55 and Above
The structure changes at age 55. Members aged 55 and above earn an extra 2% per annum on the first S$30,000 of combined CPF balances, and an extra 1% per annum on the next S$30,000 (i.e., amounts between S$30,001 and S$60,000). The OA cap of S$20,000 still applies — only the first S$20,000 of OA is counted toward the qualifying balance.
| Age Group | Extra Interest Rule | OA Included? | Simple Meaning |
|---|---|---|---|
| Below 55 | +1% on first S$60,000 combined balance | Yes — first S$20,000 of OA only | Up to S$600/year extra at maximum qualifying balance |
| 55 and above | +2% on first S$30,000; +1% on next S$30,000 | Yes — first S$20,000 of OA only | Up to S$900/year extra at maximum qualifying balance |
The priority order for counting balances toward the extra interest limit is: RA (if applicable) → OA (capped at S$20,000) → SA → MediSave. Extra interest is credited to the SA (for members below 55) and RA (for members aged 55 and above). Source: CPF Board. Subject to change.
Because only S$20,000 of your OA qualifies for extra interest, a person with a large OA balance is not maximising the bonus on the excess. For example, if OA is S$80,000, only S$20,000 of it gets the extra 1%. The remaining S$60,000 in OA earns only 2.5% — which is part of why leaving large sums in OA indefinitely is less efficient than transferring to SA or using OA for housing.
Why CPF Grows Faster Than Most People Think
Many Singaporeans mentally discount their CPF balances because the money is not accessible for daily spending. But accessible or not, the money is compounding every year — and over a long time horizon, the numbers become meaningful.
Five reasons CPF growth surprises people:
- Stable, risk-free rates. The 2.5% on OA and 4% on SA/MA are guaranteed minimums, unlike market investments that can decline. Over 30 years, 4% p.a. with no losses compounds significantly.
- Monthly contributions keep adding principal. If you are employed, employee and employer CPF contributions arrive every month — adding new money that immediately starts earning interest.
- The extra interest bonus. An additional 1–2% on up to S$60,000 of combined balances adds hundreds of dollars per year — S$600 for most below-55 members at maximum qualifying balance, more at 55+.
- Annual compounding. Interest earned in year 1 becomes principal in year 2, earning its own interest. The effect is small in early years but accelerates significantly over decades.
- Long working lives. A 25-year-old who starts working today will be contributing to CPF for 30–40 years before retirement. That time horizon dramatically amplifies compounding.
CPF growth feels slow year by year. In Year 1, interest on S$20,000 combined balances at current rates is approximately S$700–S$800. But over 10, 20, or 30 years, interest can become a major component of your total CPF balance — sometimes exceeding total contributions for members with long working lives and minimal OA withdrawals.
A Singaporean who enters the workforce at 25, earns a median salary, and does not use CPF OA for housing could plausibly accumulate more in CPF interest over a working lifetime than the total their employer contributed on their behalf.
Real Singapore CPF Growth Scenarios
The following scenarios are estimates based on current CPF Board rates, simplified annual compounding, and standard below-55 allocation rates. They use broad assumptions and are for illustration only. Your actual CPF growth will differ based on your specific situation.
Scenario 1: Fresh Worker, S$20,000 Starting CPF Balance
A 27-year-old with roughly S$20,000 combined CPF (S$12,000 OA, S$5,000 SA, S$3,000 MediSave), contributing a total of approximately S$750/month to CPF.
| Item | Amount |
|---|---|
| Starting balance | S$20,000 |
| Monthly CPF contributions | S$750/month |
| Projection period | 10 years |
| Total contributions over 10 years | ~S$90,000 |
| Estimated interest earned | ~S$29,741 |
| Estimated total CPF after 10 years | ~S$139,741 |
Verdict: After 10 years of consistent contributions, interest has added nearly S$30,000 to the balance — approaching one-quarter of the total. At this stage, contributions still dominate. The compounding effect becomes much more pronounced in the next 10–20 years.
Scenario 2: Mid-Career, S$60,000 Combined CPF, S$1,500/month Contributions
A 35-year-old with S$60,000 combined CPF (S$35,000 OA, S$15,000 SA, S$10,000 MediSave), contributing S$1,500/month total CPF (employee + employer).
| Item | Amount |
|---|---|
| Starting balance | S$60,000 |
| Monthly CPF contributions | S$1,500/month |
| Projection period | 20 years |
| Total contributions over 20 years | ~S$360,000 |
| Estimated interest earned | ~S$213,719 |
| Estimated total CPF after 20 years | ~S$633,719 |
Verdict: Over 20 years, interest accounts for approximately S$213,719 — about 34% of the total balance. This is the range where CPF compounding starts to become very meaningful. Every year of additional growth accelerates faster because the principal base is larger.
Scenario 3: Approaching 55, S$150,000 Combined CPF, S$2,000/month
A 45-year-old with S$150,000 combined CPF (S$80,000 OA, S$50,000 SA, S$20,000 MediSave), contributing S$2,000/month total CPF, projecting over 10 years.
| Item | Amount |
|---|---|
| Starting balance | S$150,000 |
| Monthly CPF contributions | S$2,000/month |
| Projection period | 10 years |
| Total contributions over 10 years | ~S$240,000 |
| Estimated interest earned | ~S$107,938 |
| Estimated total CPF after 10 years | ~S$497,938 |
Verdict: With a larger starting balance, interest is doing significantly more work — over S$100,000 generated in just 10 years. The size of the existing balance matters as much as contributions at this stage. This is why early CPF savings have disproportionate long-term value.
Enter your own numbers to see your projected CPF growth.
The calculator above accepts your actual OA, SA, and MediSave balances and gives you a year-by-year projection based on current CPF Board interest rates.
Calculate my CPF growth →The Hidden Cost of Using OA for Housing
Most Singaporeans use their CPF OA to pay for HDB mortgages. This is convenient, reduces monthly cash outflow, and is one of the main reasons CPF OA exists. But it has a compounding cost that most people only understand in retrospect.
Every dollar drawn from OA for housing is a dollar that no longer earns 2.5% p.a. inside CPF — and no longer contributes to the extra interest calculation. Over 20 years, this opportunity cost is substantial.
| Scenario | Monthly OA Housing | Estimated CPF After 20 Years | Difference |
|---|---|---|---|
| No OA housing deduction | S$0 | ~S$633,719 | — |
| S$1,000/month OA for housing | S$1,000/mo | ~S$319,520 | −S$314,199 |
Estimate only. S$60,000 starting balance (OA S$35k, SA S$15k, MA S$10k), S$1,500/month total CPF contributions, 20-year projection at current CPF rates. OA deduction reduces OA balance which reduces the compounding base. Figures do not account for flat valuation, property accrued interest rules, or other CPF-related housing costs.
The point is not that you should never use OA for housing. Many Singaporeans need to — especially for BTO flats where cash flow is limited. The point is that using OA for housing is a real trade-off. The money drawn from OA to pay a mortgage is money that is no longer compounding inside CPF. Understanding this helps you think more clearly about the total long-term cost of property decisions. If you sell the property eventually, you must refund the CPF principal plus accrued interest — so the trade-off accounting is complex.
Before making HDB or mortgage decisions, see the HDB Affordability Calculator for your purchasing capacity and the Mortgage Calculator for monthly cash and CPF repayment estimates.
OA to SA Transfer: Higher Interest, Lower Flexibility
Because SA earns 4% compared to OA’s 2.5%, some CPF members voluntarily transfer OA funds to SA. Over long periods, this 1.5 percentage point difference produces meaningfully higher balances in SA.
But the transfer is generally irreversible. Once money moves from OA to SA, it cannot be moved back, and it can no longer be used for housing loan payments or most other OA purposes. This is a significant constraint for younger members who may need OA funds for a flat in the next five years.
OA-to-SA transfers are generally one-way. Before transferring, confirm: (1) you are below age 55, (2) your SA has not yet reached the Full Retirement Sum, and (3) you do not anticipate needing OA funds for housing in the near future. CPF rules on transfers have been updated over time — always check the latest rules at CPF Board before proceeding.
For those close to or above age 55, the picture changes — SA is typically converted to a Retirement Account at 55, and the transfer rules and implications differ significantly. Check the CPF Board’s resources if you are approaching this milestone.
What Most People Misunderstand About CPF Interest
“CPF is just locked money doing nothing”
CPF balances earn stable interest every year — 2.5% in OA, 4% in SA and MediSave. Even without any new contributions, existing balances grow. The money is locked, but it is not inert. Over 10 years, S$30,000 in SA grows to approximately S$44,400 in interest alone (before any new contributions).
“OA and SA are basically the same”
They are not. The 1.5 percentage point difference between OA (2.5%) and SA (4%) compounds dramatically over decades. S$50,000 in OA for 30 years grows to approximately S$104,000. The same S$50,000 in SA grows to approximately S$162,000 — a difference of nearly S$58,000 from the same starting amount.
“Using CPF for housing is free”
There is no direct cash cost to using OA for your mortgage, but there is an opportunity cost: the compounding you gave up. When you eventually sell the property, CPF rules require you to refund the principal withdrawn plus the interest it would have earned inside CPF. This is not a punishment — it ensures your CPF funds are available for retirement — but it means the housing subsidy is not as simple as it appears on the surface.
“Extra interest is automatic and guaranteed”
The extra CPF interest is based on rules set by the CPF Board and applied to qualifying balances up to specific limits (S$60,000 below 55; different structure above 55). If your combined balance falls below these limits, you may not receive the full bonus. And the rules are subject to review — they have changed over time and may change again.
“CPF growth depends mainly on contributions”
In the early years, yes. But over 20–30 years, interest overtakes contributions as the primary driver of CPF growth for consistent savers. This is why the age at which you start building CPF balances matters far more than most people realise — every additional year of compounding in your 20s and 30s produces disproportionate returns later.
How to Use Your CPF Growth Result
If Your Projected Balance Looks Lower Than Expected
Check a few things: how much of your OA is being used for housing (this reduces compounding significantly); whether your monthly contributions are lower than the standard rates suggest; and whether your starting balances are correctly entered. A lower-than-expected result is often explained by high OA housing deductions over many years.
Also check your actual CPF savings rate — the Savings Rate Calculator shows how your CPF contributions and cash savings compare to your income. And the CPF Contribution Breakdown Calculator shows exactly how your monthly salary splits into OA, SA, and MediSave.
If Your Projected Balance Looks Healthy
A strong projected CPF balance is good news — but understand the composition. If most of the balance is in OA (because you have been saving consistently without using it for housing), consider whether some of that OA could be working harder in SA through voluntary transfers, subject to the flexibility trade-offs discussed above. Also remember that CPF balances do not automatically generate retirement income — CPF LIFE premiums, drawdown timing, and the Full Retirement Sum all determine how much you actually receive monthly from retirement age.
To understand your monthly take-home pay and how CPF contributions affect your cash income, see the CPF Take-Home Pay Calculator.
CPF growth is only one part of your financial picture.
See how CPF, salary, housing, savings rate, and cost of living connect in your real monthly life — all in one place.
Frequently Asked Questions
CPF interest is calculated daily based on your account balances and credited to your accounts annually, at the end of each year. The base rates are: OA 2.5% p.a., SA 4.0% p.a., MediSave 4.0% p.a., and RA 4.0% p.a. In addition, an extra interest bonus applies to qualifying portions of your combined CPF balance — 1% extra on the first S$60,000 for members below 55, and a different structure (2% on the first S$30,000, 1% on the next S$30,000) for those aged 55 and above. The OA contribution to the extra interest is capped at S$20,000. (CPF Board)
The CPF Ordinary Account (OA) earns a base interest rate of 2.5% per annum. The actual rate is the higher of 2.5% or the 3-month average of major local banks’ savings rates — in practice, this has remained at 2.5% in recent years. Additionally, the first S$20,000 of your OA balance may qualify for extra CPF interest (1% below 55, 2% on the first qualifying portion at 55+). Rates are reviewed by the CPF Board.
The CPF Special Account (SA), MediSave Account (MA), and Retirement Account (RA) each earn a base rate of 4.0% per annum. The actual rate is the higher of 4% or the 12-month average yield of 10-year Singapore Government Securities plus 1%. In practice, this has remained at 4.0% in recent years. These accounts may also earn extra CPF interest on qualifying balances. Rates are reviewed by the CPF Board and may change.
Yes. CPF interest is calculated daily based on your account balance and credited to your account at the end of each year. Once credited, the interest becomes part of your balance and begins earning interest itself in the following year. This annual compounding means that the longer money stays in CPF, the more the interest compounds on itself. The calculator on this page simulates this with annual compounding for simplicity — actual CPF interest accrues daily and is credited annually.
Extra CPF interest is an additional interest bonus on qualifying portions of your combined CPF balance. For members below age 55: +1% on the first S$60,000 of combined CPF balance, with OA counted for a maximum of S$20,000. For members aged 55 and above: +2% on the first S$30,000 and +1% on the next S$30,000, with OA still capped at S$20,000. The extra interest is credited to SA (below 55) or RA (55 and above). CPF members with very low balances receive proportionally less; those with balances above the caps do not receive extra interest on the excess.
Yes. Every dollar withdrawn from OA for housing loan repayments reduces the balance that is compounding inside CPF. Over 20 years, this opportunity cost can be very significant — our scenario above shows a difference of approximately S$314,000 in projected CPF balance between using S$1,000/month from OA for housing versus not doing so. This does not mean using OA for housing is wrong — many Singaporeans need to for cash flow reasons — but it is a real trade-off. Note also that CPF rules require you to refund the principal withdrawn plus accrued CPF interest when selling the property.
OA earns 2.5% p.a. while SA earns 4.0% p.a. Voluntarily transferring OA funds to SA increases your SA balance and long-term interest earnings. However, the transfer is generally irreversible — you cannot move money back from SA to OA. Once transferred, you can no longer use those funds for housing or most other OA purposes. Whether to transfer depends on your housing plans, age, how close you are to retirement, and your SA balance relative to the Full Retirement Sum. Always check the latest CPF rules and consult CPF Board or a licensed financial adviser before making this decision.
CPF interest rates are set by the CPF Board and have minimum floors — OA is guaranteed a minimum of 2.5% p.a. and SA/MA/RA a minimum of 4.0% p.a. These minimums are set by the CPF Act. In practice, the rates are reviewed periodically based on market benchmarks. The extra interest bonus is also set by the CPF Board and subject to review. While CPF is a government-managed scheme and broadly considered stable, rates are not permanently fixed and can change following legislative or policy review.