What is CPF accrued interest on an HDB flat?

CPF accrued interest is the 2.5% per annum compound interest your CPF OA would have earned if the money had stayed in CPF rather than being used for your property. On sale, you must refund both the CPF principal used AND the accrued interest back to your CPF OA.

Does CPF accrued interest reduce the cash I get when selling my HDB?

Yes. The CPF refund (principal + accrued interest) is deducted from sale proceeds and returned to your CPF OA -- not to your bank account. On $250K CPF used over 10 years, the refund is approximately $318K, meaning $68K more than you originally withdrew goes back to CPF, not to cash.

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CPF & Financing

CPF Accrued Interest When You Upgrade: The Hidden Cost Most Upgraders Miss

By Winfred Quek · CEA R073319H · 9-minute read · Last reviewed May 2026

Quick answer: When you sell your HDB flat, you must refund to your CPF OA not just the principal withdrawn but also accrued interest at 2.5% per annum compounded the interest your CPF would have earned had the money stayed invested. On $250,000 CPF used over 10 years, the total refund obligation is approximately $318,000 meaning $68,000 more than you withdrew goes back to CPF, not your bank account. This refund lands in your CPF OA and can be reused for the next property purchase, but it is not liquid cash. Most upgraders underestimate their war chest by $30,000–$80,000 as a result.

Facts verified: May 2026 · Sources linked below

Key Takeaways

• CPF accrued interest compounds at 2.5% p.a. on all CPF OA withdrawals used for your property S$250K over 10 years means S$318K total CPF refund, not S$250K.
• The CPF refund (principal + accrued interest) goes back to your CPF OA not your bank account and can be reused for the next property, but is not liquid cash.
• For a S$650K HDB sale with S$318K CPF refund, actual cash to bank is only ~S$317K but most upgraders plan as if they have S$650K in cash.
• CPF OA refund cannot be used to pay ABSD ABSD must be paid in cash. This catches upgraders buying second properties who expected CPF proceeds to cover part of the stamp duty.
• Your exact CPF accrued interest figure is visible on cpf.gov.sg under "My CPF" → "Property" always check this before planning any upgrade.

What is CPF accrued interest and why does it exist?

When you use CPF Ordinary Account savings to pay for your home whether for the downpayment, monthly mortgage instalments, or stamp duties those funds are no longer in your CPF account earning the guaranteed 2.5% per annum OA interest rate.

CPF's rule is that the housing withdrawal is not treated as a gift from CPF to you. It is treated as a temporary use of your retirement savings. CPF tracks how much interest your OA would have earned if the money had stayed in the account, and requires that amount to be restored to your OA upon disposal of the property.

According to CPF Board rules, this is the accrued interest the opportunity cost, in CPF terms, of using your OA for housing instead of leaving it to compound at 2.5%.

The key mechanics

Accrued interest compounds at 2.5% per annum on the CPF OA rate
It accrues from the date each CPF withdrawal is made, not from the purchase date
It must be refunded to CPF OA upon sale, transfer, or disposal of the property
It is not paid to the government it goes back to your own CPF OA
Once in your CPF OA, it can be used for the next property purchase or left to earn further CPF interest

How Much CPF Accrued Interest Will You Owe After 5, 10, and 15 Years?

The accrued interest calculation is compound, not simple. The formula is: Accrued Interest = Principal × [(1.025)^n − 1], where n is the number of years since withdrawal. In practice, since withdrawals happen monthly over many years, the calculation is done monthly but the table below uses a lump-sum approximation for illustration.

CPF Principal Used	Years Held	Accrued Interest (2.5% compound)	Total CPF Refund Required
$150,000	5 years	~$19,700	~$169,700
$150,000	10 years	~$41,900	~$191,900
$150,000	15 years	~$67,200	~$217,200
$250,000	5 years	~$32,800	~$282,800
$250,000	10 years	~$68,200	~$318,200
$250,000	15 years	~$111,900	~$361,900
$350,000	5 years	~$45,900	~$395,900
$350,000	10 years	~$95,500	~$445,500
$350,000	15 years	~$156,600	~$506,600

For a typical HDB owner who used $300,000 in CPF over 10 years, the total CPF refund on sale is approximately $382,000 some $82,000 above the principal. That $82,000 goes back to CPF OA, not to the bank account. It is available for the next property but is not liquid.

Why Does CPF Accrued Interest Reduce Your Upgrade War Chest?

The "upgrader war chest" calculation most people do is roughly: HDB sale price − outstanding HDB loan = proceeds. But the correct calculation is:

Net cash after HDB sale =
Sale price
− Outstanding HDB loan balance
− CPF principal refund
− CPF accrued interest refund
− Agent commission (1–2%)
− Legal fees (~$2,500)
= Actual cash to bank account

The CPF refund (principal + accrued interest) goes to your CPF OA. The cash that hits your bank account is often significantly lower than the "equity" figure most upgraders cite.

Scenario	HDB Sale Price	HDB Loan Balance	CPF Refund (incl. accrued interest)	Agent + Legal Fees	Actual Cash to Bank	CPF OA Refund (reusable)
MOP upgrader, 5 years, modest CPF use	$550,000	$0	~$170,000	~$13,500	~$366,500	~$170,000
MOP upgrader, 10 years, typical CPF use	$650,000	$0	~$318,000	~$15,000	~$317,000	~$318,000
Long-holder, 15 years, heavy CPF use	$750,000	$0	~$445,000	~$17,000	~$288,000	~$445,000
High-value Queenstown flat, 10 years	$850,000	$0	~$360,000	~$19,000	~$471,000	~$360,000

The "CPF OA Refund" column is the amount that goes back to your CPF OA on sale. It is not lost you can use it for the next property's downpayment, subject to CPF withdrawal rules for private property. But it cannot be used to pay ABSD (which must be in cash), or for renovation, or for any non-CPF-eligible purpose.

Critical caveat CPF refund does not cover ABSD: If you are buying a second property and ABSD is payable, that amount must come from cash CPF cannot be used to pay ABSD. For an SC buying a $1.5M second property (20% ABSD = $300,000), that $300,000 must be liquid cash. Many upgraders plan to use HDB sale proceeds for ABSD only to realise at execution that the CPF refund reduces their liquid cash significantly. Always model the cash vs CPF split before committing to a purchase sequence.

The "trapped equity" effect explained

When upgraders talk about their HDB "equity," they typically mean: sale price minus loan balance. But for CPF-funded properties, a large portion of that equity is not freely deployable cash it is CPF equity, accessible only through CPF's property withdrawal rules.

For a $650,000 HDB with $318,000 CPF refund obligation:

Gross equity: $650,000
CPF equity: $318,000 (returns to CPF OA)
Cash equity: $650,000 − $318,000 − $15,000 fees = ~$317,000

Of the $317,000 cash equity, the upgrader must use at least $75,000–$100,000 in cash for the new condo's minimum 5% cash downpayment plus BSD. The CPF OA refund of $318,000 can cover the remaining 20% of the new property's downpayment if the CPF balance after refund is sufficient.

This means the upgrade math often works but the liquidity profile is very different from what most people expect. The CPF is doing a lot of the heavy lifting; cash is the scarcer resource.

Does accrued interest affect anything if the property appreciates?

The accrued interest is only relevant at the point of sale. If the property has appreciated significantly, the accrued interest is a small fraction of the gain. For example:

Bought HDB for $380,000 in 2016; used $250,000 CPF over 10 years
Selling in 2026 for $650,000 gain of $270,000
CPF accrued interest: ~$68,000
Net cash gain after all deductions: ($650K − $318K CPF refund − $14K fees) = $318,000 cash + $318,000 CPF OA, versus original cash paid of ~$130,000

In this scenario, the accrued interest is not a financial burden it is simply the mechanism by which CPF captures its share of the property's return. The upgrader still comes out strongly positive. The accrued interest only becomes a material problem when the property has not appreciated or has declined in which case the sale proceeds may not be sufficient to repay the full CPF refund, meaning the gap is covered by cash.

How to find your actual CPF accrued interest figure

Step 1: Log in to cpf.gov.sg with your Singpass.

Step 2: Navigate to "My CPF" → "Property" section. This shows your current CPF housing withdrawal amount and the accrued interest to date.

Step 3: Note the figure under "Principal Withdrawn" and "Accrued Interest." The sum of both is your current CPF refund obligation if you sold today.

Step 4: Project forward. If you plan to sell in 2 years, add approximately 5.06% more to the current refund figure (2.5% × 2 years compound). This is the estimated refund at the future sale date.

Step 5: Subtract the projected CPF refund from your target sale price (less fees) to get your estimated cash-in-hand at the time of upgrade. Use this to model whether your cash covers the minimum 5% downpayment + BSD on the new property.

Step 6: Use Winfred's Restructuring Calculator to model the full upgrade cashflow including CPF refund, BSD on new property, and ABSD if applicable.

Winfred's Take

The number that surprises most clients is this: S$300K of CPF used over 10 years means S$382K going back to CPF OA S$82K more than they withdrew, in an account they cannot freely spend. Every single upgrade plan I review that skips this step overestimates cash by 15–25%. The second trap is thinking the CPF refund solves the downpayment problem for the next property: it does in OA terms, but ABSD must still be paid in cash, and a S$1.2M second property needs S$240K cash ABSD on top of the CPF-backed downpayment.