Project · 2026-04-27 · 7 min read
Reselling Bangkok off-plan before completion · the mechanics
Most off-plan investors think they have to hold to handover. They do not. Bangkok has a healthy assignment market that lets you sell your contract before completion · sometimes for 20 to 40% capital gain. Here is how it actually works.
What 'assignment' means in Thai off-plan
When you sign an off-plan reservation and pay deposits + phasing instalments, you are buying a sales-and-purchase contract for a unit that does not yet exist. Thai law allows you to assign that contract to a new buyer before the developer transfers the title. You sign an assignment agreement, the new buyer pays you (your deposit + capital appreciation), and the developer recognises them as the new contracted purchaser.
When this is most attractive
- · Project sells out fast and developer raises phase prices 15 to 25% before completion · your contract is now in-the-money
- · Foreign quota fills up · you can sell to a foreign buyer who would otherwise be locked out
- · BTS extension or major neighbourhood catalyst lifts area pricing pre-handover
- · You bought launch-phase pricing and the project is now in late-phase pricing 18 to 24 months in
What it actually costs to flip
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- · Developer transfer / change-of-name fee · 1 to 3% of unit price, varies by developer
- · Specific business tax + 0.5% stamp duty on the assignment value (sometimes split with buyer)
- · Marketing · agent commission to find the new buyer, 2 to 3% standard
- · Total round-trip · 4 to 7% on the assignment value
How the maths work on a typical flip
You buy a 12M THB launch-phase one-bed in 2026, paying 30% over 24 months · 3.6M THB committed. By 2028, the developer has sold 80% of stock and raised phase pricing to 14.5M THB. You assign your contract for 14.0M THB. Your capital invested was 3.6M, your cash return is 14.0M - 3.6M - 7% costs = 9.4M. That is 161% return on capital invested over 24 months · roughly 60% IRR. Not all projects do this, but the ones that do are the ones we underwrite first.
What kills a flip
- · Project fails to sell · your assignment market disappears
- · Developer financial distress · transfer requirements tighten and assignments slow
- · Macro shock · 2020 / 2021 saw the Bangkok flip market freeze for 18 months
- · Foreign quota issues · if the new buyer is foreign and quota is full, you cannot transfer
When to commit to holding instead
If your goal is yield and lifestyle (DTV, retirement, long stays), the flip play distracts from the actual reason you bought. Hold to handover, lease, enjoy. The flip is a different trade · know which one you are doing.
Off-plan in Bangkok is two trades · a yield play and a phase-spread play. Decide upfront which one you are doing, because the buy criteria differ.
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We model both scenarios per project and tell you which is realistic. Ask for the assignment-friendly shortlist.