CPF Accrued Interest Calculator
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When you sell a property bought with CPF savings, you must refund to your CPF Ordinary Account the principal amount you withdrew PLUS the interest it would have earned had it stayed in your CPF — this is your "accrued interest". Estimate it below using the current 2.5% p.a. OA rate, compounded monthly the same way CPF Board calculates it.
This assumes CPF has been used continuously at these amounts for the whole period, and leaves out the CPF Extra Interest scheme (it doesn't apply to money already withdrawn for property). Your actual figure -- including any housing grants and their own accrued interest -- is on My CPF Online Services under My Statement.
How this is calculated
CPF Board describes the mechanism as: interest is "accumulated annually and compounded monthly from the time funds are taken out ... until the property is sold." This calculator applies that same monthly compounding, at the annual OA rate you enter, to both your upfront lump sum and your ongoing monthly instalments (treated as a monthly savings stream, each month's amount compounding from the month it was used).
Sources: CPF Board — CPF interest rates, CPF Board — What happens to the sales proceeds after selling your home.