HDB Upgrader to Condo: Sell First or Buy First, the Timeline and the Cash Flow

Upgrading from an HDB flat to a condo is really three transactions stacked together: selling the flat, buying the condo, and bridging the months or years in between. Get the order wrong and you can end up paying ABSD you didn’t plan for, or renting for three years. This guide sets out the decision for HDB upgraders, with a worked example using an indicative unit at LinkTown Residences (Hougang Central Residences), and points to our detailed guides for each step.

Four numbers to find before anything else

1. Your MOP date. You cannot exercise an OTP for private property until HDB counts your MOP as met. See HDB MOP and upgrade timing.
2. Your net sale proceeds. Expected price, minus the outstanding loan, minus the CPF you used plus accrued interest (which goes back to your CPF account). What remains is cash.
3. Your loan limit. A bank In-Principle Approval shows what TDSR allows at the 4% stress rate. The condo loan is a bank loan; see HDB vs condo for how MSR and TDSR differ, and HDB loan vs bank loan for what else changes.
4. Where you will live in between. A new launch here is expected to complete around 2030/2031, so this can be the biggest cost of all.

Sell first or buy first?

	Sell the flat first	Buy the condo first
ABSD (Singapore Citizens)	0% on a first property	20% upfront; married couples with at least one citizen can claim a refund if the flat is sold in time
Loan-to-value	Up to 75% with no other housing loan	Up to 45% if the HDB loan is still outstanding, with at least 25% cash
Where you live	Rent or stay with family until the condo is ready	Stay in your flat during construction
Main risk	Rent for years; condo prices move while you wait	Flat doesn’t sell in the refund window; heavy upfront cash
Suits	Buyers of completed resale condos, or those with family to stay with	New-launch buyers with strong cash or a paid-off HDB loan

Two refinements matter. First, if all flat owners are Singapore PRs, HDB requires the flat to be sold within 6 months of buying private property, so buy-first works differently. Second, clearing the HDB loan before you buy generally restores the 75% loan limit, because MAS limits depend on outstanding housing loans; ask your bank.

Worked example: a Hougang 5-room family

A married couple, both Singapore Citizens, own a 5-room flat past its MOP:

• Sale price: S$775,000
• Outstanding HDB loan: S$120,000
• CPF used plus accrued interest: S$280,000, refunded to their CPF accounts
• Cash from the sale: S$375,000

The condo: S$2,665,000. Buyer’s Stamp Duty: S$102,850.

If they sell first

• Loan at 75%: S$1,998,750. Stress-test instalment about S$9,540 a month, so TDSR needs about S$17,350 of monthly income.
• Down payment 25%: S$666,250, of which at least S$133,250 in cash; the rest can come from cash or CPF.
• With BSD, upfront needs are about S$769,100. Their S$375,000 cash and S$280,000 CPF cover about S$655,000, leaving roughly S$114,000 from savings.
• No ABSD, but three to four years of rent while the condo is built.

If they buy first with the HDB loan outstanding

• Loan capped at 45%: S$1,199,250. They must fund S$1,465,750 themselves, at least S$666,250 of it in cash, spread over the progressive payments.
• ABSD at 20%: S$533,000, due with BSD within 14 days of signing the S&P (IRAS), refundable if the flat is sold within the window.
• Before any refund, that is about S$2.1m of their own money and CPF, which few upgraders have.

If they clear the HDB loan, then buy first

Paying off the S$120,000 HDB loan from savings generally brings the condo loan back to 75%. They still pay S$533,000 ABSD upfront, then sell the flat near TOP and claim the refund. This is the version of buy-first that many upgraders actually use, sometimes with a short bridging loan to cover gaps. It only works if the flat sells in time: miss the IRAS window and the ABSD stays paid.

See how a new launch’s payments fall over the build:

A timeline around a 2027 launch

When	Sell-first household	Buy-first household
Now to launch	Confirm MOP; get IPA; list the flat; line up interim housing	Confirm MOP; get IPA; decide whether to clear the HDB loan; set aside ABSD
Launch (expected early 2027; UOL’s August 2026 results guide 2H 2027)	Book with proceeds in hand; pay 5%	Book; pay 5%; BSD and ABSD within 14 days of the S&P
About 8 weeks after booking	Sign S&P; pay 15%	Sign S&P; pay 15%
Construction years	Progressive payments while renting	Progressive payments while living in the flat
9 to 12 months before TOP	Plan the move	Register Intent to Sell and market the flat
TOP (expected around 2030/2031)	Pay 25%; move in	Pay 25%; complete the flat sale; claim the ABSD refund; move in

The HDB side of that timeline, from Intent to Sell to completion, is set out in our HDB resale process guide. The condo side is on our payment scheme page.

Other routes worth comparing

• An EC if your household earns within S$16,000 and qualifies; most of the upcoming sites are in the north and north-west. See upcoming EC launches.
• Staying in HDB or moving to a bigger flat, if the condo stretches TDSR or cash too far. Our Hougang BTO vs condo guide covers the public-housing side.
• A completed resale condo, which makes sell-first far easier because the gap between sale and move-in can be weeks.

Why Hougang upgraders look at Hougang Central Residences

For families who want to stay near parents, schools and the hawker centres they already use, LinkTown Residences keeps them in the same town, directly linked to Hougang MRT (NE14) on the North-East Line, with the Cross Island Line interchange targeted around 2030 and a new mall and bus interchange on the site. The indicative 3-bedroom plan is the like-for-like move from a 4-room flat. None of that settles the money question, which is why the four numbers above come first.

Register to get LinkTown Residences prices and floor plans as soon as they’re released, so you can run your own upgrade numbers.

Frequently asked questions

Should I sell my HDB first or buy the condo first?

Selling first avoids ABSD and keeps loan limits at 75%, but you need somewhere to live until the condo is ready. Buying first lets you stay put during construction, but you pay 20% ABSD upfront (refundable for eligible married couples who sell in time) and, if your HDB loan is still outstanding, the bank can lend only up to 45%.

How much cash do I need to upgrade from HDB to a condo?

At least 5% of the price in cash for a first housing loan at 75% LTV, with the rest of the 25% down payment in cash or CPF, plus Buyer’s Stamp Duty. If you buy while still owning the flat with a loan, the minimum cash rises to 25% and ABSD is added.

When should I sell my HDB flat if I buy a new launch first?

Work back from the condo’s expected TOP. The HDB resale process takes about three to four months once you have a buyer, and married couples must sell within the ABSD refund window, generally six months after TOP or CSC, whichever is earlier, for an uncompleted purchase. Many owners list 9 to 12 months before TOP.

Is LinkTown Residences suitable for HDB upgraders?

It is a private condo with no income ceiling or MOP, so HDB owners past their MOP can buy. Prices are not released; analysts expect about S$2,500–2,600 psf. Check your own numbers with a bank and verify rules with HDB, IRAS and MAS.