Sell first or buy first is the first decision every upgrader faces. Selling your HDB flat first keeps stamp duty and loan rules simple: a Citizen couple pays no Additional Buyer’s Stamp Duty and can borrow up to 75%. Buying first secures the next home, but means 20% ABSD paid upfront, refunded only if the flat is sold within six months, and a lower loan limit while the HDB loan is still outstanding.
Here is what each route costs, how the six-month window works, and where the timing goes wrong.
The Two Routes in One Table
For a Singapore Citizen married couple buying a private home jointly, using IRAS and MAS rules as at November 2026:
| Sell first | Buy first | |
|---|---|---|
| ABSD on the new home | Nil (first home) | 20%, paid within 14 days, refundable if conditions met |
| Bank loan limit | 75% if no other housing loan | 45% while the HDB loan is outstanding |
| Minimum cash downpayment | 5% | 25% |
| Current instalment in TDSR | No | Yes |
| Main risk | Nowhere to live for a while | Flat not sold in time; cash tied up |
The loan figures come from MAS’s loan-to-value table, which depends on how many housing loans you have outstanding when the new one is granted. The TDSR point follows MAS’s rule that all monthly debts count.
The ABSD Refund If You Buy First
IRAS refunds ABSD on a second home to a married couple if all of these hold:
- At least one spouse is a Singapore Citizen, and the second home is bought in both names only.
- Neither owned more than one residential property when they bought.
- The first home is sold within six months of the second home’s purchase date if it was completed, or within six months of its TOP or CSC, whichever is earlier, if it was uncompleted.
- They stay married, do not change the second home’s ownership, and buy no other residential property.
- They claim within six months of the sale. For e-Stamping forms from 2 July 2023, declaring the intent to sell lets the refund be made automatically within six weeks of the sale being stamped.
Two details catch people. IRAS counts the flat as sold on the date the buyer accepts your Option to Purchase or signs the agreement, not at completion. And its examples say a slow market, an old flat or personal circumstances will not earn an extension.
Single Citizens aged 55 and above have a separate refund for a second home bought on or after 16 February 2024, if it is of lower value than the home they sell. Permanent Resident couples with no Citizen spouse have no refund route.
The short version: Selling first is simpler and cheaper upfront. Buying first means finding 20% ABSD and a 25% cash downpayment while your sale money is still locked in the flat, and selling within six months of the purchase or you lose the refund.
Sell First or Buy First: The Same Couple Both Ways
Our illustrative Citizen couple from the HDB to condo upgrade guide: $14,000 a month, a flat selling for S$650,000 with $200,000 of HDB loan left, $80,000 cash and $60,000 in their Ordinary Accounts. They want a $1.5 million completed condo. Illustration only, our own figures.
Sell first. No ABSD. Bank loan of $1,125,000 at 75%; $75,000 minimum cash. With the sale proceeds in hand, they finish about $90,700 ahead in cash.
Buy first.
- ABSD at 20%: $300,000, due within 14 days of signing.
- Loan capped at 45% of the price: $675,000, because the HDB loan is outstanding.
- Downpayment: $825,000, of which at least $375,000 in cash.
- Due at purchase, before any sale money arrives: about $1.17 million in downpayment, stamp duty and fees, against $80,000 cash and $60,000 CPF.
Even with the ABSD refunded later, the lower loan limit stays with the loan already granted. On these figures buying first does not work without a very large bridging sum. Our HDB upgrade calculator shows both routes when you switch the order.
Bridging Loans and Timing Risk
A bridging loan is a short-term loan some banks offer to cover the downpayment until your sale proceeds arrive. Rates, fees, the maximum amount and how it is assessed are set by each bank, so ask for the terms in writing and count the interest as a cost of buying first.
The timeline is the real risk. Under HDB’s resale process, you wait seven days after registering an Intent to Sell, the buyer has 21 days to exercise the option, HDB accepts a complete application within 28 working days, and completion is about eight weeks after acceptance. Three months or more is normal. Our HDB resale timeline planner puts those dates on a calendar.
If you sell first, a Temporary Extension of Stay lets you stay up to three months after completion, if the buyers agree and you have committed to buy a completed home in Singapore. Beyond that, budget for rent and storage.
Upgrading to a new HDB flat is different
If the next home is a flat bought from HDB, the order is set for you: you keep your current flat until key collection, then have up to six months to sell, says HDB. ABSD on the new flat is remitted upfront because HDB requires the sale. HDB’s contra facility or temporary loan can help with cash flow once your resale application is approved. See upgrading to a bigger HDB flat.
What To Do Next
- Work out what the sale leaves you with the HDB sale proceeds calculator, then test both orders in the HDB upgrade calculator.
- If you are thinking of buying first, check the ABSD amount in the stamp duty calculator, test the loan with your current instalment included in the home affordability calculator, and read IRAS’s conditions in full.
- Map your MOP date and the resale steps before you view any home; our MOP guide explains the count.
- Ask your conveyancing lawyer to confirm the six-month dates in writing.
