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Step 1 · DecideJames Yeo, CEA R051864Z · Updated 1 November 2026 · 9 min read
Quick answer
Sell first, for most people. Selling first tells you exactly how much you have, keeps your next loan at the full 75% limit, and means no ABSD to find upfront. The cost is somewhere to live in between, and that is the part most families under-plan. Buy first only if you can pay 20% ABSD in cash and hold two loans without sweating, or if you are moving HDB to HDB and can use HDB's contra facility so both deals complete on the same day.
An upgrader is doing two transactions, not one. The order decides how much cash you need, how strong your position is in each negotiation, and where your children sleep for three months. Here is how I walk clients through it.
What this means now · Updated 1 November 2026
Thomson Reserve sold 1,143 of 1,268 units on 31 October at an average of $2,900 psf, the biggest launch of 2026; all 350 three-bedders and 174 four-bedders went. The developers said most buyers were Singaporeans buying to live in or invest; nobody has said how many still own an HDB flat, and it may be few. If you are one of them, the pressure is not a six-month clock: for an uncompleted project that clock starts at TOP. It is the 20% ABSD paid within 14 days and parked until then, and a 45% loan limit while the flat's mortgage is still running. That is Route 2; read the extension-of-stay section before you list.
This is the first question I get from anyone moving from one home to the next, and the answer people want is "buy first, then you only move once". Sometimes that is right. More often it is the expensive answer, and the reason is not the moving van. It is the cash the rules ask you to put down when you own two properties at the same time, and what a six-month deadline does to your selling price.
Three questions that decide it
Before any timeline, I ask three things. First, if you had to pay 20% of your next home's price in cash tomorrow and wait months to get it back, could you? Second, could you service two housing loans for half a year, on the bank's terms rather than your own? Third, if the answer to either is no, where would you live for one to three months between homes? Your answers put you in one of three routes below. Almost nobody is in the buy-first route without already knowing it.
Route 1: sell first, then buy
You put the flat on the market, get an option exercised, and only then commit to your next purchase. Three things go right when you do it this way.
You know your number. Sale proceeds, CPF refund with accrued interest, outstanding loan, all settled before you make an offer. Upgraders who buy first are guessing their budget from a valuation that may not be what a buyer pays. The sale proceeds calculator gives you the sell-side figure in two minutes. The HDB to condo calculator then turns that figure into the most you can pay for the next home, with the loan limit, BSD and ABSD worked in.
Your next loan is a first loan. With no outstanding housing loan, a bank can lend up to 75% of the new property, and the minimum cash portion of the downpayment is 5%. Buy before you sell and the new loan is a second housing loan: the limit drops to 45%, and the cash portion rises to 25%. On a $1.5 million condo that is the difference between a $375,000 downpayment (at least $75,000 of it cash) and an $825,000 downpayment (at least $375,000 cash). Same condo, same buyer, half a million dollars apart on day one.
No ABSD. If your HDB flat is sold before you buy, the private property is your only residential property and the Additional Buyer's Stamp Duty is zero for a Singapore Citizen. Own both at once and ABSD on the second is 20%, payable within 14 days of exercising the option, whether or not you later qualify for a refund.
The cost of route 1 is time and a roof. Across my 77 HDB sales, 58% found a buyer within three months and 42% took longer, and after the option there is roughly two months more to completion. So plan for four to six months from listing to keys handed over, and for the gap between that day and moving into your next home. That gap is the subject of the interim housing section below, and it is solvable; it just has to be planned in week one, not week twenty.
Route 2: buy first, then sell
You commit to the new home while still owning the flat, then sell the flat. It gives you one move and total freedom on what to buy. It also puts you on two clocks at once, and which clocks depends on what you are buying.
The ABSD clock (HDB to private only). ABSD is the price of owning two residential properties at once. If the second one is a condo or landed home, a Singapore Citizen pays 20% within 14 days of exercising the option. A married couple with at least one Singapore Citizen spouse, buying the new home jointly, can claim a refund of the 20% ABSD if the first property is sold within six months of buying the second (for an uncompleted property, within six months of TOP or CSC). The refund comes after the sale completes and you apply to IRAS; the 20% still has to be paid first. On $1.5 million that is $300,000 of cash parked with the taxman for most of a year. A single buyer, or a couple who does not meet the conditions, gets no refund at all. If the second home is another HDB flat, there is no ABSD to pay. IRAS remits it upfront, because HDB already requires you to sell the first flat, so the cash hurdle below is a private-property problem, not an HDB-to-HDB one.
The HDB clock (any purchase). HDB requires you to dispose of your existing flat within six months of completing a resale flat purchase, and similar rules apply for a new flat or executive condominium. So even when there is no ABSD, the six-month deadline is still there, as a condition of the purchase rather than a tax rule, and it does the same thing to your negotiating position.
The loan clock. Until the flat is sold, both loans count against your Total Debt Servicing Ratio, which caps all monthly debt at 55% of gross income. Many households who qualify for the new loan on their own will not qualify while the old loan is still on the books. This is where a bridging loan comes in: banks will lend against your exercised sale option for up to six months so you can complete the purchase before the sale money arrives, at a rate above a normal home loan. It works, but it needs an exercised option in hand, which means the flat has already found its buyer.
Now the part I care most about as the person selling your flat. Every buyer's agent who sees "owner has bought, must complete by March" reads it correctly: this seller cannot walk away. The six-month deadline is a discount you hand to the other side. I have watched sellers in this position accept $15,000 to $20,000 below what the flat would have fetched with time, which is far more than any fee, ABSD interest or extra move. If you buy first, the flat must be listed the same week, priced to sell within eight weeks, and you should assume the last month of the deadline is not yours.
Route 3: HDB contra, selling and buying resale flats on the same day
If you are selling one resale flat to buy another, HDB's Enhanced Contra Facility lets both transactions complete on the same day. Your sale proceeds and CPF refund go straight into the purchase, so you do not need to fund the full downpayment from savings or take a bridging loan, and you move once. It is the closest thing to buy-first without the buy-first cash.
The conditions matter. Both the flat you sell and the flat you buy must be HDB resale flats; a BTO, EC or condo does not qualify. The purchase must be on an HDB housing loan or no loan, not a bank loan, and an existing bank loan on your current flat will usually rule you out. Your buyer and your seller cannot be doing contra themselves, so you cannot chain three families together. And all parties must submit their resale applications within a short window of each other, seven days at the time of writing, or the contra request is cancelled. In practice you still have to line up a buyer for your flat and a seller for the next one within a few weeks of each other, which is where the agent earns the fee. The cash you need upfront is typically the option money, legal fees and a small buffer rather than a full downpayment.
One catch people miss: contra ties you to the HDB loan at HDB's rate, which is a plus in some years and a minus in others. Check the rate against what banks are offering the month you decide.
The worked numbers
Take a couple, both Singapore Citizens, selling a 4-room flat at $680,000 and buying a $1.5 million condo. Q2 2026 median for a 4-room is about $679,570, so this is a typical upgrader.
| Upfront, day of purchase | Sell first | Buy first |
|---|---|---|
| Maximum bank loan | 75% · $1,125,000 | 45% · $675,000 |
| Downpayment (cash + CPF) | $375,000 | $825,000 |
| Of which cash, minimum | $75,000 | $375,000 |
| Buyer's Stamp Duty | $44,600 | $44,600 |
| ABSD paid upfront | $0 | $300,000 |
| ABSD refunded later if flat sells within 6 months | n/a | $300,000 |
| Cash and CPF needed on day one | $419,600 | $1,169,600 |
Loan limits assume no other housing loan for sell-first and one outstanding loan for buy-first. BSD on $1.5m: 1% of the first $180k, 2% of the next $180k, 3% of the next $640k, 4% of the next $500k. Rates as at September 2026; check IRAS and MAS before relying on them.
The buy-first column comes down once the flat sells: the ABSD is refunded, and the sale proceeds repay the bridging loan or top up the equity. But you need the $1.17 million, or a bank that will bridge most of it, on the day you exercise the option. That is the number that quietly answers the question for most families.
Interim housing, the part everyone under-plans
If you sell first, there is a gap between completing the sale and getting keys to the next home. It can be zero days if the two completions land together, or months if you buy a resale unit that itself takes ten weeks to complete. Four ways to cover it, in the order I usually suggest:
- Temporary extension of stay. HDB allows the buyer of your flat to let you stay on for up to three months after completion, agreed in writing before the resale application and with a $20 admin fee. Most buyers agree if you ask early and the amount is fair; many buyers are themselves waiting to sell. This is the cheapest bridge there is, and the one most sellers forget to negotiate at the option stage, when they have the most leverage.
- Align the completion dates. An HDB resale completes about eight weeks after HDB accepts the application, so a purchase started a few weeks before your sale's completion can land within days of it. When I handle both sides I sequence the paperwork for exactly this.
- Family. Three months with parents costs nothing but patience. Put the furniture in storage, which runs to a few hundred dollars a month for a flat's worth, and keep the moving quotes for both legs.
- A short rental. The most expensive option, and the hardest to find, because most landlords want a year and a 4-room rental in 2026 is a few thousand dollars a month. Some will take six months at a premium. If you go this way, sign the rental only after your sale option is exercised, not before.
Two moves cost roughly one extra mover's bill and a weekend. Set against $300,000 of ABSD parked upfront or a rushed sale at $15,000 below value, it is the cheapest problem on this page.
Extension of stay: up to three months in the flat you have just sold
HDB's temporary extension of stay lets you remain in your flat for up to three months after completion, if the buyer agrees. Three rules decide whether it works. It must be agreed in writing before the resale application is submitted, so raise it at the Option stage, when the buyer wants the deal and you have leverage. The buyer applies for it as part of the resale application and pays HDB a $20 administrative fee; whatever you pay the buyer for those weeks is a private arrangement between the two of you. And three months is the ceiling: HDB does not extend it, so the purchase on the other side needs to complete inside that window. It is the cheapest bridge on this page and the one most sellers forget to negotiate.
The clocks on one page
| Rule | What it means for order |
|---|---|
| Minimum Occupation Period: 5 years (10 for Plus and Prime flats) | You cannot list before it ends, whichever route you take |
| Intent to Sell: valid 12 months, 7-day cooling before any option | Register it the week you decide, even if buying first |
| ABSD: 20% on a Singapore Citizen's second property, paid within 14 days | Only when the second home is private; remitted upfront for an HDB-to-HDB purchase |
| ABSD refund: sell the first home within 6 months of buying the second | Married couples with an SC spouse only; apply after the sale completes |
| HDB: dispose of the existing flat within 6 months of the new purchase | A condition of the purchase, not just a tax rule |
| Second housing loan: 45% limit, 25% cash; TDSR 55% across both loans | Why buy-first needs a bridging loan or deep savings |
| Temporary extension of stay: up to 3 months after completion | The cheapest interim housing there is |
| Resale completion: about 8 weeks after HDB accepts the application | The window you plan the next purchase around |
What I would do
Moving HDB to HDB: sell and buy together on contra if you are taking an HDB loan; sell first with a negotiated extension of stay if you are taking a bank loan. Taking a bank loan? Compare the latest home loan rates before you sign.
Moving HDB to private: sell first, unless you can pay the ABSD in cash without touching the downpayment and still sleep. If you buy first anyway, list the flat the same week at a price that clears in eight weeks, and treat the sixth month as if it does not exist.
Either way: negotiate the extension of stay when you grant the option, not after. That one line in the option is worth more than most people's moving budget.
The order decides how the sell side goes, which is why I ask about the buy side before I quote a price for the flat. Both sides of an upgrade, sale and purchase, I handle for the same fixed $1,999 plus GST each, with no exclusive agreement to sign.
Frequently asked questions
Can I buy a resale HDB flat before selling my current one?
Yes, and there is no ABSD to pay: IRAS remits it because HDB requires you to dispose of the existing flat within six months of completing the purchase. What you still need is the cash and loan for a second flat while the first is unsold, which is why HDB's contra facility is usually the better route: same-day completion, sale proceeds and CPF go straight into the purchase, no second downpayment.
Do I pay ABSD if I buy a condo while still owning my HDB?
Yes. A Singapore Citizen pays 20% ABSD on a second residential property, within 14 days of exercising the option. A married couple with at least one SC spouse buying jointly can claim it back after selling the HDB within six months. Singles cannot.
What is a bridging loan and do I need one?
A short-term bank loan, typically up to six months, that covers the downpayment gap until your sale proceeds and CPF refund arrive. Banks want your sale option exercised before they lend. You need one only if you buy first; sell first and there is nothing to bridge.
How long can I stay in my flat after it is sold?
Up to three months, if the buyer agrees to a temporary extension of stay before the resale application is submitted. Ask for it at the option stage. Beyond three months you need somewhere else.
Should I sell first if the market is rising?
Rising markets tempt people to buy first so the next home does not run away. Your flat rises too, and the buy-first cash rules do not soften in a hot market. If you are worried about missing out, sell first and shorten the gap by lining up the purchase during your sale's completion period rather than after it.
What if my flat does not sell within the six months?
You lose the ABSD refund, you may be in breach of HDB's disposal condition, and the bridging loan comes due. This is why buy-first sellers cut price hard in month four. Extensions are not guaranteed, so plan on selling in the first eight weeks, not the last.
Licensed real estate salesperson, CEA R051864Z. 665 transactions since 2015. Creator of the C.H.O.I.C.E. framework and author of Buy & Sell Properties Start With C.H.O.I.C.E. I sell for a fixed $1,999 plus GST instead of 2%, with no exclusive agreement to sign.
Tell me your flat, what you want to buy and roughly what you have in cash and CPF, and I will tell you which route fits, before you commit to either side.
WhatsApp James · +65 8688 0009