CPF Accrued Interest Calculator Singapore 2026
The Hidden Debt of Using CPF OA for Property
Calculate exactly how much accrued interest at 2.5% p.a. must be returned to your CPF account when you sell your Singapore property — on top of the CPF principal withdrawn. Includes net cash proceeds after CPF refund, outstanding loan, and agent fee.
Total CPF OA used for initial payment, stamp duties, and legal fees at purchase. Check your CPF housing withdrawal history on Singpass.
Your monthly CPF contribution to mortgage repayment. If you switched to cash at some point, enter your average or use 0 if fully cash-serviced.
From purchase date to anticipated sale date. HDB sellers must complete 5-year MOP first.
Remaining mortgage balance when you sell. Used to calculate net cash proceeds.
Enter a sale price to see estimated cash proceeds after CPF refund, loan repayment, and agent commission.
Enter your CPF lump sum used at purchase and monthly installment amount to see the total accrued interest that must be returned to CPF — the figure that shocks most Singapore property sellers.
What Is CPF Accrued Interest? — The Hidden Debt That Reduces Your Property Sale Proceeds Singapore 2026
When you use your CPF Ordinary Account (OA) savings to buy a home, CPF Board continues to credit interest at 2.5% per annum — the same rate your OA would have earned had you left the money in CPF. This notional interest is called accrued interest, and it accumulates monthly on the total CPF withdrawn for housing. When you sell your property, you must return to your own CPF account both the principal (the total CPF used) and the accrued interest.
This is not a bank charge or a penalty — it is CPF Board ensuring your retirement savings account is made whole for the opportunity cost of using retirement money for property. The accrued interest goes back to you, into your OA. However, the practical impact is stark: the refund obligation reduces your net cash proceeds from a property sale significantly, and many sellers only discover the true size of this “hidden debt” shortly before the sale completion.
How Accrued Interest Compounds — Monthly Rate, Lump Sums and Installments Singapore 2026
Accrued interest compounds monthly at a rate of 2.5% ÷ 12 = 0.2083% per month. The calculation differs for lump sums vs monthly installments:
- Lump sum (e.g. down payment used at purchase): accrues interest for the entire holding period from day one.
- Monthly installments: each month’s CPF payment accrues interest only from the month it was used until sale — meaning early installments accrue more interest than recent ones.
This means sellers who hold the property longer and use more CPF face an exponentially larger accrued interest obligation. A S$100,000 lump sum held for 25 years accrues approximately S$83,000 in interest alone — 83% on top of the original withdrawal.
Accrued Interest at 2.5% p.a. — How Much Does S$100,000 Become Over Time?
| Years Held | CPF Withdrawn (Lump Sum) | Accrued Interest | Total CPF Refund | Interest as % of Principal |
|---|---|---|---|---|
| 5 years | S$100,000 | S$13,293 | S$113,293 | 13.3% |
| 10 years | S$100,000 | S$28,008 | S$128,008 | 28.0% |
| 15 years | S$100,000 | S$45,094 | S$145,094 | 45.1% |
| 20 years | S$100,000 | S$64,701 | S$164,701 | 64.7% |
| 25 years | S$100,000 | S$87,101 | S$187,101 | 87.1% |
| 30 years | S$100,000 | S$113,879 | S$213,879 | 113.9% |
How This CPF Accrued Interest Calculator Works — Monthly Compounding Formula and Net Proceeds
Step 1 — Calculate Accrued Interest on Lump Sum (OA Used at Purchase)
For the initial CPF lump sum L withdrawn at purchase, accrued interest over N months = L × ((1 + 0.025/12)^N − 1). This is simple compound interest on the full lump sum for the entire holding period. It accounts for CPF used for stamp duties, legal fees, initial payment, and any upfront housing payments made from OA.
Step 2 — Calculate Accrued Interest on Monthly Installments (Iterative)
For monthly installments, each payment accrues interest from the month it is used until sale. The installment paid in month 1 accrues interest for (N−1) months; the installment paid in month N accrues for 0 months. The total accrued interest on installments is the sum of M × ((1 + r)^(N−t) − 1) for each payment month t. This iterative calculation means the total accrued interest on installments is always less than on an equivalent lump sum, because later installments have less time to accrue.
Step 3 — Compute Net Sale Proceeds After CPF Refund, Loan and Agent Fee
Net cash proceeds = Sale Price − CPF Refund (Principal + AI) − Outstanding Loan − Agent Commission (1%). This is the actual cash you deposit to your bank account after the sale. The CPF refund amount goes back into your OA — it is yours, but locked back in CPF. Many sellers confuse “profit on paper” (sale price minus purchase price) with “actual cash in hand” — the CPF accrued interest is the biggest hidden reducer of real cash proceeds.
3 Real Singapore Property Sale Examples — HDB MOP Seller, Long-Hold Condo & Upgrade Shortfall
Example 1: HDB Seller After 8 Years
Example 2: Condo Held 20 Years
Example 3: Upgrade Proceeds Shortfall
3 Expert Tips on Managing CPF Accrued Interest — Cash vs CPF Strategy, Sale Timing & OA Top-Ups
Partially Service Your Loan in Cash to Reduce Accrued Interest
You are not required to use CPF for monthly installments — you can choose to pay partly or fully in cash and leave OA untouched. Every dollar you service in cash instead of CPF reduces the principal accruing 2.5% interest. For a S$2,000 monthly installment over 20 years, switching 50% to cash saves approximately S$25,000 in accrued interest. The trade-off is reduced monthly cash flow — but the benefit is a smaller CPF refund obligation and more cash proceeds when you sell. Run both scenarios in this calculator before deciding your installment split.
Know Your Break-Even Sale Price Before Listing
Your break-even sale price = Outstanding Loan + Total CPF Refund (Principal + AI) + Agent Fee. Selling below this means a shortfall — you owe more to the bank and CPF than you receive. Use the net proceeds calculator above with your current outstanding loan and current CPF housing withdrawal statements (from Singpass → CPF → Property). Many Singapore upgraders discover their break-even is S$100,000–S$200,000 higher than they assumed because they forgot to include accrued interest in the calculation. Check this number before signing any OTP.
CPF Refund Goes Back to OA — Factor This Into Your Next Purchase Budget
When you sell, the CPF refund (principal + accrued interest) re-enters your OA. This is not lost money — it strengthens your CPF balance for the next purchase. For upgraders, the returning OA can significantly increase the CPF available for the next home’s down payment, stamp duties, and installments. However, if you are above 55, the OA refund may trigger an RA top-up toward the Full Retirement Sum before it becomes freely accessible. Model your post-sale OA balance and next purchase CPF headroom using the CPF Housing Usage Estimator before committing to your upgrade timeline.
