Sell HDB, Buy Condo: The Timeline, and How the ABSD Rules Affect the Order

Plenty of Singapore households are asking the same question this month: should I sell my HDB and buy a condo, and in what order? The answer depends less on opinion than on a calendar. HDB runs on fixed steps, a condo purchase runs on a contract, and the Additional Buyer's Stamp Duty (ABSD) is decided by how many homes you own on the day you buy. This piece is the timeline. For the strategy comparison, read our guides on selling HDB first or buying the condo first and sell first or buy first.

Why timing matters now

The gap between the two markets has been widening. URA's 3Q26 flash estimate has the private property index up 1.4% quarter on quarter, while the HDB resale price index dipped 0.2% to 202.4 in the same quarter, its third straight quarterly dip. Financing has also turned up from the lows: in October HSBC and Citi raised their 1.40% condo fixed packages to 1.80% and 1.90% respectively, and the 3 month compounded SORA has moved from about 1.05% in mid 2026 to about 1.24% in mid October. Those are observations, not predictions, but they make it worth knowing how long each step really takes. Our note on why HDB resale and private prices are moving apart covers the data.

The timeline, step by step

The table sets out the HDB side and the condo side. HDB durations come from HDB. The condo durations depend on your contract and whether you buy resale or new launch, so they are labelled illustrative.

Added up, the HDB route from agreeing a price to completion is roughly 3 to 4 months: up to 21 days for the option, HDB accepting a complete resale application within 28 working days, then about 8 weeks to completion. Add time to find a buyer and the 7 day Intent to Sell lead time; that is a planning estimate from the published steps, not a promise.

How ABSD applies, and the remission for couples

IRAS charges ABSD on the higher of purchase price or market value, based on the buyer's profile and the number of residential properties owned. For a Singapore citizen, the first residential property has no ABSD, the second is 20% and the third and subsequent are 30%. For a Singapore PR, the first is 5% and the second is 30%. The key point for upgraders: the second property rate is triggered if you still own your HDB flat when you buy the condo.

Path A: sell the HDB first

If the HDB flat is no longer counted as yours on the condo purchase date, the condo is your first residential property for ABSD purposes. IRAS's ABSD guidance says a property drops out of the seller's count once there is a contract to sell it and the buyer has exercised the option, even before completion. The cost is logistics: you may need somewhere to live between handover and condo completion, and you may have sold before finding the right condo. How your own sale dates line up with the purchase date is a point to confirm with your lawyer.

Path B: buy the condo first

If you buy the condo while you still own the flat, ABSD at the second property rate is payable on the condo. IRAS provides a remission for married couples, and the conditions are specific. As IRAS states them:

• The property is bought in both names of the couple only, and the couple includes a Singapore citizen.
• Neither spouse owned an interest in more than one residential property on the purchase date of the second property.
• ABSD must already have been paid on the second property.
• The first property must be sold within 6 months. For a completed property, the 6 months run from the purchase date. For an uncompleted property (for example a new launch), they run from the date of the Temporary Occupation Permit (TOP) or Certificate of Statutory Completion (CSC), whichever is earlier.
• The couple must remain married, there must be no change of ownership in the second property when the first is sold, and the couple must not have bought any other residential property since buying the second.
• IRAS states that the timeline is not extended for market conditions or personal circumstances. A temporary COVID 19 extension applied only to purchases made on or before 1 June 2020.

The purchase date is the option acceptance date, the sale and purchase agreement date, or the transfer date, in that order of availability. A refund application is to be made within 6 months after the sale date of the first property. Where the buyers declare their intent to sell and claim the refund in the stamping form (for stamping submitted on or after 2 July 2023), IRAS refunds automatically within 6 weeks of stamping the first property's sale. The remission is a refund, so the ABSD cash is still due up front. On an illustrative S$1.5 million purchase, 20% is S$300,000 paid first and refunded later only if every condition is met.

Common timing traps (illustrative)

• The 6 month window runs from the wrong date. Couples assume it starts at condo completion. For a completed condo it starts at purchase, and for an uncompleted one at TOP or CSC, whichever is earlier.
• The HDB sale slips. A buyer's loan or CPF step is delayed and HDB completion moves, eating into a 6 month window that IRAS does not extend for personal circumstances.
• Sole name purchase. Buying the condo in one name can take the couple outside the remission conditions.
• Buying a third property by mistake. Any other residential purchase since the second property is a stated condition.
• Selling before the MOP date. Your flat has to be eligible to sell. Check the date on our MOP guide before you plan the sale.

For the HDB steps themselves, see how to sell an HDB resale flat. For the money side, read HDB to condo upgrade affordability.

Checklist to review with your agent and banker

• Is the flat past MOP, and is your Intent to Sell registered at least 7 days before you want to grant an option?
• What is the target condo completion date, and does the HDB completion date work backwards from it?
• Under Path A, where do you live between handover and condo completion?
• Under Path B, is the condo to be bought in both names, and is the 6 month window clear for a completed or uncompleted property?
• How much cash is needed up front for ABSD, and what funds it before the flat's proceeds arrive?
• What loan will the bank approve on the condo while the HDB loan is outstanding?

Frequently asked questions