There is no universally "correct" answer — but there is a right answer for your finances and your family's tolerance for disruption. This is the single biggest timing decision in an HDB-to-condo upgrade, and it determines whether you pay Additional Buyer's Stamp Duty at all.
The core trade-off
| Sell first | Buy first | |
|---|---|---|
| ABSD | None (condo is your only property) | 20% upfront, reclaimable via remission |
| Cashflow certainty | High — you know your proceeds | Lower — two mortgages briefly |
| Moving | May need interim housing | Move once |
| Market risk | Buy into a possibly higher market | Sell into a possibly softer market |
Sell first: the low-risk default
For most upgraders, selling first is the cleaner path. You avoid ABSD entirely, you know your exact budget, and you negotiate your condo purchase from a position of certainty. The cost is logistics: you may need to rent for a few months, or arrange a longer completion / lease-back with your flat's buyer. Many families rent short-term or stay with relatives to bridge the gap — a few months of rent is usually far cheaper than a five- or six-figure ABSD outlay you might not fully recover.
Buy first: convenience at a cost
Buying first makes sense when you have found a specific unit you cannot risk losing, or when you have the liquidity to float ABSD and two loans. You will need to pay 20% ABSD on completion and claim it back under the remission rules by selling your flat within the window. This demands real cash reserves and discipline around the sale timeline.
Rule of thumb: sell first unless you have both (a) strong cash reserves to cover ABSD and dual mortgages and (b) a specific unit worth the premium.
The bridging loan
A bridging loan covers the gap between buying your new home and receiving proceeds from your old one. It is short-term (typically up to six months) and interest-only in many structures. It smooths cashflow but adds cost and should be sized carefully — model it in the Upgrade Planner before committing.
A simple decision path
- Can you comfortably fund 20% ABSD and two mortgages for up to 6 months? If no → sell first.
- Is there a specific unit you would regret losing? If no → sell first.
- If yes to both, model the ABSD, remission timeline, and bridging cost, then decide.
Related: how ABSD remission actually works.