Nexus Mortgage SG  ·  6 June 2026  ·  10-minute read

Upgrading From HDB to Condo in Singapore (2026): A Real Case Study

The Two Routes — Sell First vs Buy First

An HDB-to-condo upgrade has one decision that dwarfs all the others: do you sell the flat before or after you buy the condo? It is not about preference — it sets whether you pay Additional Buyer's Stamp Duty (ABSD), and how much cash you must find on day one.

For a Singapore Citizen couple, the second-property ABSD is 20% in 2026. On a $2.09M condo that is $418,000 — payable in cash within 14 days of the purchase. The married-couple ABSD remission can refund it, but only if you sell the first matrimonial home within 6 months. Selling first sidesteps the whole thing.

The Real Case — 4-Room HDB to a $2.09M Condo

A married couple, both Singapore Citizens, owned a 93 sqm 4-room HDB flat that had cleared its Minimum Occupation Period. They were ready to move up to a 3-bedroom condominium (969 sqft, $2,090,000). The flat still carried a $120,000 loan.

The upgrade decision in one image: the order you sell and buy decides your ABSD and your day-one cash.

When they came to me, the instinct was to secure the condo first so they wouldn't “miss it.” But fronting $418,000 in ABSD — even with a later refund — was neither necessary nor comfortable. We ran the other route: sell the HDB first, so the condo would be a first property at 0% ABSD, and bridge the short gap between completing the sale and paying the condo downpayment. They sold the flat in 2024 for $668,000.

The Numbers: Proceeds, Loan, BSD, $0 ABSD

Here is how the money moved.

The $190,000 of CPF that came back into the Ordinary Account, plus the ~$358,000 cash, funded the downpayment and stamp duty on the condo. Because the flat was sold first, the only stamp duty on the purchase was Buyer's Stamp Duty (~$74,100) — no ABSD at all.

Why Selling First Avoided Fronting $418,000

Had they bought the condo while still holding the HDB, the condo would have been a second property. For a Singapore Citizen that is 20% ABSD = $418,000, due in cash within 14 days. They could have claimed the married-couple remission afterwards — but only by selling the HDB within 6 months. That route has two real problems:

• Cash flow: very few upgraders can park $418,000 for months waiting on a refund, on top of the downpayment.
• Deadline risk: if the flat doesn't sell within 6 months, the refund is lost. You don't control the buyer's timeline.

Selling first removed both. No ABSD to front, no refund to chase, no clock. The only thing left to solve was timing — and that is a much smaller, cheaper problem.

Bridging the Timing Gap

The new home — financed at 75% LTV, with the HDB sale proceeds and CPF redeployed into the downpayment.

The catch with selling first is sequencing: the condo downpayment can fall due before the HDB sale proceeds actually land. That gap is exactly what a bridging loan is for — a short-term loan that advances your expected sale proceeds so you can complete the purchase, then is repaid the moment the sale money arrives.

Bridging rates run around 3–4% per annum, but you are charged only for the days you actually use it. In this case the bridge was needed for just two weeks, so the interest came to only a few hundred dollars — a rounding error against the $418,000 ABSD that sequencing avoided. We also used an HDB completion extension to line up the sale and purchase dates as closely as possible, keeping the bridge short.

Financing the Condo: LTV, TDSR, CPF

The condo loan is a standard first housing loan, but on a much larger quantum than the flat — so three checks matter:

• LTV 75%: the maximum first-loan ratio, capping the loan at ~$1,567,500 on the $2.09M price. The 25% downpayment needs at least 5% in cash; the rest can be cash or CPF. See choosing a condo loan.
• TDSR 55%, stressed at 4%: the bigger instalment must still sit within 55% of gross income at the MAS 4% stress floor, not today's rate. We confirmed the couple cleared it before committing — the most important check in any upgrade. Background: TDSR explained.
• CPF: the $190,000 refunded to the Ordinary Account (principal plus 2.5% accrued interest) was redeployed into the condo. How CPF funds a purchase: CPF OA guide.

They took a fixed-rate package at just over 2% — sensible in 2024, when rates were higher. With 2026 fixed rates now from around 1.40%, that loan is a prime refinancing candidate once its lock-in ends — a reminder that the upgrade isn't the last decision, just the first. The full step-by-step for the new loan is in our home loan application guide.

Sell-First vs Buy-First: Which Is Right for You

Sell first if

• You cannot (or would rather not) front the 20% ABSD in cash.
• You want certainty — no refund to chase, no 6-month clock.
• You're comfortable with a short bridge and possibly a brief interim stay.

Buy first if

• You must lock down a specific unit now (e.g. a launch) and can't wait to sell.
• You have the cash to front the ABSD and ride out the refund.
• You're confident the HDB will sell well within 6 months.

For the majority of upgraders, sell-first wins on both cash flow and risk. Buy-first is a tool for a specific situation, not the default. Either way, the move is to model it before you sign anything — the wrong sequence can cost six figures.

Mistakes to Avoid

1. Buying first without the ABSD cash. The 20% is due in 14 days, refund or not. Don't assume the HDB sells in time.
2. Not stress-testing the bigger loan. A condo instalment at the 4% floor is far larger than an HDB one — check TDSR before you fall for a unit.
3. Forgetting the CPF refund. Your sale proceeds shrink by the CPF principal and accrued interest returned to your OA — plan the actual cash you'll hold.
4. Ignoring the timing gap. Coordinate the HDB completion and condo downpayment dates, and line up a bridging loan early if they don't meet.
5. Over-stretching the tenure. Pushing the loan past age 65 or 30 years drops your LTV to 55% — more cash down, not less.

Frequently Asked Questions

For most upgraders, sell first. Once you no longer own the flat, the condo is a first property and a Singapore Citizen pays 0% ABSD; a bridging loan covers the timing gap. Buy-first means fronting the 20% ABSD in cash and reclaiming it only if you sell within 6 months — suited to those securing a specific unit who can fund both.

If you sell the HDB before buying, the condo is your only property and a Singapore Citizen pays 0% ABSD. If you buy while still owning the HDB, it's a second property at 20% ABSD (2026), payable in 14 days, refundable under the married-couple remission only if you sell the flat within 6 months.

A short-term loan that advances your expected HDB sale proceeds so you can pay the condo downpayment before the sale completes, repaid once proceeds arrive. Rates are ~3–4% p.a. but charged only for the days used — a two-week bridge costs a few hundred dollars. It's the standard fix for sell-first upgraders.

Up to 75% LTV on a first housing loan, subject to TDSR (55% of gross income, stressed at 4%) and a tenure within the LTV cap. On a $2.09M condo that's about $1,567,500, with a ~$522,500 downpayment (at least 5% cash, the rest cash or CPF).

The CPF OA you used, plus 2.5% p.a. accrued interest, is refunded to your OA on completion — here about $190,000 — and can then be used for the condo downpayment and stamp duty.

After your MOP you may keep the flat and buy private, but the condo then counts as a second property and ABSD applies (20% for a Singapore Citizen). Many upgraders sell to avoid the ABSD and free up cash and CPF for the condo.

About the author — Dan Ler has advised on Singapore home loans since 2017 at Nexus Mortgage SG, an independent brokerage comparing 16+ MAS-regulated lenders. The upgrade in this article is a real client he advised — HDB sold first, condo bought at 0% ABSD, the timing gap bridged for two weeks. Banks pay Nexus on disbursement, so there is no cost to the borrower.

Nexus Mortgage SG is an independent Singapore mortgage advisory. This article is general information, not financial, tax or legal advice, and client figures are rounded and anonymised. ABSD, BSD, LTV, TDSR, CPF and HDB resale rules are governed by IRAS, MAS, HDB and CPF policy; figures reflect positions as of 6 June 2026 and can change. Always confirm your specific eligibility with an independent mortgage advisor, and ABSD remission with IRAS, before acting. Sources: IRAS ABSD, HDB: Selling Your Flat, CPF: Using Your CPF to Buy a Home, MAS TDSR.