Most upgrade plans fail on sequencing, not affordability. Sell too late and you pay Additional Buyer's Stamp Duty upfront on the new purchase; sell too early and you rent for years while a project is built. The starting point is knowing exactly how long each leg takes: a well-run HDB resale completes in roughly 4–5 months from OTP, while a new launch bought off-plan takes 3–4 years to reach TOP. Everything else in this guide flows from that gap.
Part 1 — the HDB sale: five milestones, hard deadlines
Before anything else: register an Intent to Sell on the HDB Resale Portal at least 7 days before granting any Option to Purchase. HDB will not recognise an OTP granted inside that window.
Grant the Option to Purchase
You sign the OTP and hand it to the buyer, who pays an option fee of up to $1,000 to lock in the agreed price. The buyer's HDB Flat Eligibility (HFE) letter must be valid at this point — HDB requires it before any OTP is granted.
Buyer exercises the OTP
Within 21 days the buyer returns the signed OTP and pays the balance of the deposit — the total deposit is capped at $5,000 for an HDB resale. The deal is now mutual. That cap is also why your proceeds arrive almost entirely at completion: do not plan to fund the new purchase's early payments from the deposit.
HDB Resale Portal submission
Either party may submit their portion of the resale application first. Once the first party submits, the second must complete theirs within 7 calendar days, or the application lapses, both sides restart, and the application fees are paid again. Track both submission dates — the clock starts silently.
HDB acceptance and processing
HDB verifies eligibility and documents — up to 28 working days to confirm acceptance. The 8-week processing clock only starts from the date of the acceptance letter. During those weeks, both parties endorse documents and pay fees on the My Flat Dashboard; approval is granted once both are complete.
Completion appointment
HDB schedules completion once endorsements and payments are in order. The date in the acceptance letter is the earliest possible date — both parties can agree a later one via MyRequest@HDB. On the day, you hand over keys and receive your net sale proceeds.
Part 2 — where the sale money actually goes
The headline sale price is not what you walk away with, and — the part that surprises most first-time sellers — a large slice returns to CPF rather than to your bank account. Here is a fully worked waterfall on a $550,000 sale. Every line scales with your own numbers; the structure does not change.
| Item | Amount | Goes to |
|---|---|---|
| Sale price | $550,000 | — |
| Less: outstanding HDB loan | − $80,000 | HDB / bank |
| Less: CPF principal refund | − $180,000 | Your CPF OA |
| Less: CPF accrued interest (2.5% p.a.) | − $25,000 | Your CPF OA |
| Less: agent commission (~2%) | − $11,000 | Fees |
| Less: legal & admin fees | − $3,000 | Fees |
| Less: other costs (misc. deductions) | − $5,000 | Fees |
| Net cash proceeds | $246,000 | Your bank account |
| CPF OA balance restored | $205,000 | Your CPF OA |
Read the last two rows together: this household's true war chest for the next purchase is $451,000 — $246,000 cash plus $205,000 of refunded CPF — even though "only" $246,000 lands in the bank. The CPF refund is not lost money; it is downpayment fuel that can only be spent on the next property.
Part 3 — turning proceeds into a new launch budget
Two independent caps decide what you can buy, and the lower one always wins. The loan cap comes from TDSR: all monthly debt repayments must fit within 55% of gross income, tested at a 4% stress rate (the full mechanics are in our TDSR guide). The equity cap comes from LTV: the bank lends at most 75% of the price on a first housing loan, so your cash plus CPF must cover the remaining 25% — before stamp duty.
Continuing the worked example with a household earning $12,000 a month, no other debt:
In this example the equity cap binds first: $451,000 ÷ 25% ≈ $1.8 million, and the $1.35 million loan that implies passes the TDSR test with a little room to spare. Note that Buyer's Stamp Duty — about $47,600 on a $1.8 million purchase — plus legal fees must come out of the same pool, so a prudent working budget sits slightly below the theoretical maximum.
What the monthly commitment looks like
On a $1.35 million loan over 30 years, the instalment is roughly $4,724 a month at an illustrative 1.6% package rate — packages we track in mid-2026 start from 1.35% (see current mortgage rates). The bank, however, sizes the loan at the 4% stress rate, where the same loan costs about $6,445 — just inside the $6,600 TDSR ceiling. That gap is deliberate regulatory headroom: if rates rise toward 4%, this household is stretched but not broken. Remember too that on a new launch the instalment ramps up progressively with construction rather than starting at full size — the full mechanics are in our companion guide, Buying a new launch condo.
Part 4 — sequencing: sell first or buy first?
| Factor | Sell first, then buy | Buy first, then sell |
|---|---|---|
| ABSD | None — no property owned at purchase | Payable upfront at the second-property rate; remission possible for eligible married couples selling the first home within the stipulated window (for BUC, within 6 months of TOP/CSC) |
| Loan assessment | Clean TDSR — no existing mortgage counted | Existing mortgage counts as debt; loan quantum usually falls sharply |
| Downpayment funding | Sale proceeds and CPF refund available before the 25% is due | Must fund 25% + BSD + ABSD without sale proceeds |
| Housing gap | Interim rental (or family) for 2–4 years until TOP; up to 3 months' extension of stay negotiable with the buyer | None — move only when the new home is ready |
| Best suited to | Most upgraders buying off-plan new launches | Households with substantial spare cash/CPF who value certainty of housing over cost |
Verdict
For a typical HDB household buying an uncompleted new launch, sell first is the financially cleaner sequence: zero ABSD, a clean TDSR assessment, and proceeds in hand before the 25% equity is due — at the cost of interim housing, which the progressive payment scheme's gentle early instalments help absorb. The decisive work happens before the OTP is granted: verify the EIP quota, map the HDB completion date against the new project's payment stages, confirm the CPF refund and cash positions, and stress-test the final instalment at 4%. Upgraders who do that mapping once, on paper, rarely need to improvise later.
Frequently asked questions
How long does an HDB resale take end to end?
About 4–5 months from OTP: up to 21 days for the buyer to exercise, up to 28 working days for HDB acceptance, then roughly 8 weeks to the completion appointment — plus the 7-day Intent to Sell cooling period before any OTP.
Can I buy the new launch before selling?
Yes, but ABSD at the second-property rate is payable upfront, and your existing mortgage counts against TDSR. Eligible married couples can claim ABSD remission by selling the first home within the stipulated window — for a BUC, within six months of TOP/CSC.
What happens to my CPF when the flat is sold?
The CPF principal used plus accrued interest at 2.5% p.a. is refunded to your Ordinary Account from the proceeds. It is not cash, but it is immediately reusable as downpayment for the next purchase.
Why is the HDB deposit capped at $5,000?
HDB caps the resale deposit (option fee up to $1,000 plus exercise balance) at $5,000. Practically, it means nearly all your proceeds arrive at completion — plan the new purchase's early payments around that.
What is the 7-day portal rule?
Once one party submits their resale application portion, the other has 7 calendar days to submit theirs. Miss it and the application lapses, fees are forfeited, and both sides restart.
Where do we live while the new launch is built?
Most sell-first upgraders rent or stay with family for the 2–4 years to TOP. An extension of stay in the sold flat of up to 3 months can be negotiated with the buyer, which bridges the handover, not the construction period.
Is a resale levy payable?
Not for an HDB-to-private-condo upgrade. The resale levy applies to buying a second subsidised flat or a new EC from a developer.
How is my budget computed, in one line?
Budget = the lower of (max loan under TDSR at the 4% stress rate ÷ 75%) and (available cash + CPF ÷ 25%), with stamp duty funded from the same pool.
Why does the EIP quota matter to me as a seller?
If a prospective buyer's ethnic group or PR status is at quota for your block, HDB will reject the application outright. Checking the quota before granting an OTP avoids losing weeks to a doomed transaction.
Update history
- Guide published. Proceeds waterfall and budget example at $550,000 sale / $12,000 household income; TDSR at 55% with 4% stress rate; LTV at 75%.
Methodology & sources. Milestones and deadlines follow HDB's published resale procedures and Resale Portal rules. CPF refund mechanics from CPF Board rules. Loan computations use the MAS TDSR framework (55% threshold, 4% medium-term stress rate) and prevailing LTV limits. Stamp duty from IRAS published rates.
Disclaimer. All figures are illustrative samples, not projections of any actual household. Nothing on this page is financial, legal or property advice. Timelines are indicative and subject to HDB processing and individual circumstances. Verify against HDB, CPF Board, IRAS and your bank, and seek professional advice for your own situation.
Talk it through with an advisor
Our research tells you what the data says. If you want to work through what it means for your own situation — budget, ABSD position, timing an HDB sale, or comparing launches against resale options — you can request a one-to-one consultation.
- No obligation, and no pressure to transact — the first conversation is about your goals, not a product.
- Personalised affordability and stamp-duty scenarios based on your actual numbers.
- Launch and tender alerts for the specific projects you shortlist.
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