CPF Distribution Calculator: How It Works

The CPF Distribution Calculator works out the interest your CPF savings earn across the Ordinary, Special, and MediSave Accounts, and shows how that interest is distributed to each account. You enter your current balances and the year you want to calculate for, and it returns the monthly and annual interest for each account, plus the total. This helps you plan for retirement and understand how CPF interest compounds.

Formula

The calculator uses the basic annual interest formula for each account:

• OA Interest = OA balance × 2.5%
• SA Interest = SA balance × 4%
• MA Interest = MA balance × 4%

Where OA, SA, and MA are the balances in your Ordinary, Special, and MediSave Accounts as of the start of the year. The rates are the current base interest rates set by the CPF Board (subject to change). Total interest is the sum of all three.

Note: These are base rates. The CPF Board may pay extra interest (up to 1.5% more on the first $60,000 of your combined balances, with 1% extra on the first $30,000 for those aged 55 and above). This calculator does not include those bonuses—see the limits section.

Worked Example

Using the default values: OA = S$50,000, SA = S$40,000, MA = S$30,000, age = 35.

1. OA interest = 50,000 × 0.025 = S$1,250.00
2. SA interest = 40,000 × 0.04 = S$1,600.00
3. MA interest = 30,000 × 0.04 = S$1,200.00
4. Total interest = 1,250 + 1,600 + 1,200 = S$4,050.00

The calculator shows exactly that: OA S$1,250.00, SA S$1,600.00, MA S$1,200.00, total S$4,050.00.

How CPF Interest Works

CPF interest is calculated monthly and compounded annually. The rates are reviewed quarterly by the CPF Board, but the base rates have been stable for years: 2.5% for OA, 4% for SA and MA. Interest is computed on your lowest balance for the month, so if you withdraw money mid-month, you lose interest for that month on the withdrawn amount.

Interest is credited to your accounts by the end of the year, and it becomes part of your balance for the next year’s calculation. This compounding effect is why starting early matters—small differences in rates grow over decades.

How to Use the Calculator

Enter your current balances for each account. If you don’t know them, log in to the CPF website or check your annual statement. The calculator assumes you keep those balances for the whole year—no contributions, withdrawals, or transfers. For a more accurate forecast, you would need to factor in monthly contributions (which are based on your salary and age) and any voluntary top-ups.

The age input is not used in the base calculation, but it reminds you that extra interest applies when you are 55 and above. For a quick estimate, just use your current balances.

Common Mistakes and Misconceptions

• Ignoring the extra interest: The CPF Board pays up to 1.5% extra interest on the first $60,000 of your combined balances (with 1% extra on the first $30,000 for those above 55). This calculator does not include that, so your actual interest will be higher if you have less than $60,000 in total.
• Using the wrong rate for OA: OA is 2.5%, not 4%. Many people mix up OA and SA rates.
• Forgetting monthly compounding: The formula above is annual simple interest. In reality, interest is credited monthly, but because it is compounded only once a year, the annual result is the same as long as you don’t withdraw.
• Assuming the rate is guaranteed: The CPF Board can adjust rates, but they have been stable for many years. Always check the official CPF website for the current rates.

Limits of the Formula

This calculator gives a base estimate. It does not include:

• Extra interest for lower balances (the first $60,000).
• Monthly contributions from your salary.
• Voluntary top-ups or transfers between accounts.
• Withdrawals (e.g., for housing, education, or medical expenses).
• Changes in the interest rates.

For a precise projection, use the CPF’s official planning tools, which incorporate your contribution history and age-specific rules.

Why It Matters

Knowing how much interest your CPF earns helps you plan for retirement. The difference between OA and SA rates is significant: S$10,000 in OA earns S$250 a year, while the same amount in SA earns S$400. Transferring funds from OA to SA (if you meet the criteria) can boost your retirement savings. However, OA funds are more flexible—they can be used for housing and education. This calculator lets you compare scenarios by adjusting the balances.

Frequently Asked Questions

Does the calculator include the extra 1% interest for those above 55?

No. The extra interest (1% on the first $30,000 for those aged 55 and above) is not included. To account for it, add 1% of your first $30,000 combined balance to the total. For example, if your combined balance is $50,000, you would add $300 (1% of $30,000) to the total interest.

Can I use this calculator for my CPF contributions?

No. This calculator only computes interest on existing balances. To estimate contributions, you need your monthly salary and the contribution rates, which vary by age. The CPF website provides a contribution calculator.

Why is my actual interest different from the calculator’s result?

Because the calculator assumes you keep the same balance for the whole year. In reality, contributions are added monthly, and you may withdraw money for housing or medical needs. Also, the extra interest on the first $60,000 is not included.

How often is CPF interest compounded?

Interest is calculated monthly on your lowest balance and credited to your account at the end of the year. It then becomes part of your balance, so it effectively compounds annually.

Can I transfer OA to SA to earn higher interest?

Yes, you can transfer OA savings to SA up to the Full Retirement Sum (FRS), but this reduces the amount available for housing and education. Use the calculator to see how much extra interest you would earn, then decide if the trade-off is worth it.

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in oa | Ordinary Account balance | S$ | 50000 | 0
in sa | Special Account balance | S$ | 40000 | 0
in ma | MediSave Account balance | S$ | 30000 | 0
in age | Your age | years | 35 | 0
out total_interest | Total annual interest | S$ | (oa*0.025 + sa*0.04 + ma*0.04) | 2
out oa_interest | OA interest | S$ | oa*0.025 | 2
out sa_interest | SA interest | S$ | sa*0.04 | 2
out ma_interest | MA interest | S$ | ma*0.04 | 2