Roughly 65-70% of off-plan condominium transactions in Phuket and Koh Samui involving foreign buyers are structured around developer-offered instalment schedules. This dominance is not a coincidence: access to mortgage financing from Thai banks remains marginal for non-residents, making developer payment plans the de facto standard. Our analysts have monitored these schedules across multiple market cycles and can identify clear patterns - some favourable to buyers, others carrying costs that are easy to overlook.
A critical structural point for any internationally-based investor: instalments paid to Thai developers carry no third-party payment protection. Funds are transferred directly to the developer's account, and the sole safeguards are the terms of the sale-and-purchase agreement and the developer's track record. This is a foundational risk factor that should sit at the top of any due-diligence checklist.
Quick answer
- Standard developer instalment schedules in Phuket and Koh Samui run 12 to 36 months (aligned with construction), divided into 5-15 tranches
- The initial commitment - booking fee plus first deposit - typically equals 20-30% of the unit price
- Construction-phase instalments are almost universally quoted as 0% interest, but that cost is commonly embedded in the unit price
- The final tranche, due on key handover, generally represents 30-50% of total value
- Developers typically accept payments in THB, USD, or EUR; transferring in a foreign currency from abroad is necessary to obtain the FET (Foreign Exchange Transaction) form required for freehold title registration
- Missing an instalment deadline triggers contractual penalties and, beyond a defined cure period, can result in forfeiture of funds already paid
Options and scenarios
Option 1: Standard construction-phase schedule (12-24 months)
This is the most common structure in Phuket districts such as Bang Tao, Layan, and Kamala. A buyer pays a booking fee - typically 100,000-300,000 THB - then within 14-30 days transfers a further deposit to bring the total to 20-30% of the unit price. Remaining instalments are spread evenly across the construction period.
As a worked example, consider a unit priced at 5,000,000 THB:
- Booking fee: 200,000 THB
- Deposit (within 30 days): 1,300,000 THB (combined with booking fee = 30%)
- 12 monthly instalments of approximately 125,000 THB during construction (totalling 30%)
- Final tranche on handover: 2,000,000 THB (40%)
This structure distributes currency exposure across twelve or more months, which - given the historical volatility of any major currency pair against THB - can move in either direction for foreign buyers.
Option 2: Post-completion instalment plan (ready units)
A subset of developers in Koh Samui - particularly in Bophut and Maenam - offer instalment terms on completed inventory, spread over 24-60 months. Based on our market observations, this arrangement comes with unit prices that are 8-15% higher than equivalent cash-purchase prices. That premium represents an implicit financing cost equivalent to an effective annual rate of approximately 4-7%.
A critical distinction: under post-completion instalment plans, title typically does not transfer until the final payment is made. The buyer occupies and uses the property under a contractual arrangement, but Land Office registration only occurs after the last tranche is settled.
Option 3: Leveraging assets held outside Thailand
Some internationally-based investors finance Thai property acquisitions using loans secured against real estate in their home country. This is not a Thailand-specific product - it is a standard mortgage or asset-backed loan in the investor's home jurisdiction. The proceeds are then converted and transferred to Thailand via SWIFT.
The cost of this approach is higher than the headline '0%' offered by developers, but it delivers immediate title transfer and significantly stronger negotiating leverage. In our experience, developers in Phuket and Koh Samui offer 5-10% cash-purchase discounts, which can partially offset financing costs.
Comparison table
| Parameter | Developer plan (construction) | Post-completion plan | Home-country asset loan | Thai bank mortgage |
|---|---|---|---|---|
| Financing period | 12-24 months | 24-60 months | 15-30 years | 10-20 years |
| Nominal interest rate | 0% (stated) | 0% (stated) | Market rate, home currency | 5-8% (THB) |
| Hidden cost in unit price | 0-5% | 8-15% | None | None |
| Required initial equity | 20-30% | 10-30% | 30-40% (of home-country property value) | 30-50% |
| Title transfer timing | On final payment | On final payment | Immediate | Immediate |
| Availability for foreign buyers | High | Medium | Medium (requires home-country collateral) | Very low (2-3 regional banks) |
| Currency risk | Yes (buyer's currency vs THB) | Yes (buyer's currency vs THB) | Yes (at point of conversion) | Minimal (repayment in THB) |
| FET form required | Yes, per overseas tranche | Yes | Yes | Not applicable |
Risks and mistakes
Loss of paid funds. There is no third-party payment protection mechanism for foreign property buyers in Thailand. If a developer ceases operations, encounters financial difficulty, or abandons a project, recovering funds through Thai courts is protracted and uncertain. Our analysts have tracked the Phuket market since 2018 and have recorded multiple projects that stalled or were abandoned across that period.
Errors in SWIFT transfer references. Every overseas transfer must carry a correctly worded payment reference indicating the purpose - for example: 'purchase of condominium unit at'. Common errors include omitting the project name, using vague descriptions such as 'property investment', or sending funds in a currency that is not widely traded in Thailand. A Thai bank will decline to issue an FET form for a transfer with an incorrect reference, which blocks freehold registration at the Land Office.
Currency exposure across the instalment period. In our modelling scenario, a buyer acquires a 5,000,000 THB unit on a 12-month schedule. Using a reference exchange rate of 8.30 units of a major currency per 100 THB, a 10% depreciation of the buyer's home currency (to 9.13 per 100 THB) increases the total cost in home-currency terms by roughly 10% over the instalment period. A 10% appreciation reduces it by a similar margin. Historical data from 2022-2025 shows that moves of this magnitude occurred within a single calendar year, making the scenario realistic rather than theoretical.
The real cost of '0% financing'. Developers price the cost of capital into their unit list prices. Based on our estimates, buyers who commit to a 100% upfront payment can negotiate discounts of 5-10% relative to the standard instalment price - particularly in the premium segment in Surin and Kamala in Phuket. That discount is the closest observable proxy for the embedded financing charge.
Insufficient developer due diligence. Before signing any instalment agreement, our analysts verify: the developer's track record of completed and delivered projects, valid construction permits (including EIA approval for projects above 80 units), the legal status of the underlying land title (Chanote vs Nor Sor Sam Kor), and whether the English-language contract accurately reflects agreed commercial terms.
FAQ
Are developer instalment plans in Thailand genuinely interest-free?
Nominally, yes - developers do not invoice interest on construction-phase schedules. However, the cost of providing that financing is almost always embedded in the list price. Based on our observations, the cash-purchase discount available on request runs to 5-10%, which represents the effective financing charge.
How large is the initial payment when buying on a developer instalment plan?
The standard range is 20-30% of the purchase price. The booking fee - a separate reservation payment of 100,000-300,000 THB - is credited against this first deposit. Some Koh Samui developers accept lower initial commitments in the 10-15% range, typically during early pre-sale phases.
Is an FET form needed for every instalment payment?
A full FET (Foreign Exchange Transaction) form is issued by the Thai receiving bank for each inbound overseas transfer exceeding the equivalent of 50,000 USD. For smaller amounts, the bank issues a credit advice note. Land Office registration of freehold title requires FET forms or credit advice documents collectively covering at least the full purchase price of the unit.
Can instalments be transferred in euros or US dollars rather than a local currency?
We recommend transferring in USD or EUR rather than less widely traded currencies. Some Thai banks have declined to issue FET documentation for transfers received in currencies outside the standard international settlement set, which creates downstream problems for title registration. Currency brokers generally offer spreads 0.3-0.8 percentage points tighter than retail bank rates, which compounds favourably over multiple tranches.
What happens if an instalment is paid late?
Most contracts include a grace period of 14-30 days, after which a contractual penalty applies - typically 1-2% of the overdue tranche per month of delay. After 60-90 days of non-payment, the developer is generally entitled to terminate the agreement and retain a portion of funds already paid - in most contracts, the non-refundable amount is 25-50% of total payments made to date.
Can a foreign national obtain a mortgage from a Thai bank?
Access is very limited. As of 2026, our data indicates that only 2-3 banks operating in the region - including select branches of Singapore- and Hong Kong-registered institutions - offer mortgage products to foreign nationals. Requirements include a minimum 30-50% down payment, documented income within the Asia-Pacific region, and minimum loan sizes in the range of 10-20 million THB, which places this option outside the reach of most mid-market transactions.
What does a typical Phuket instalment schedule look like?
The most common structure in Bang Tao and Layan is: 30% on contract signing, 30% in monthly instalments during construction (12-18 months), and 40% on key handover. In Rawai and Nai Harn, we observe variants with a lower final tranche (30%) offset by a higher upfront commitment.
Is a SWIFT transfer from an overseas bank sufficient to pay instalments?
Yes, SWIFT is the standard mechanism. Transfer fees on the sending side typically run to the equivalent of 20-50 USD per transaction, with potential correspondent-bank charges of 15-30 USD in addition. Processing time is 2-5 business days. For a 12-tranche schedule, cumulative transfer costs are a meaningful line item worth factoring into the total acquisition budget.
Can the instalment schedule be negotiated?
Yes. Developers in Phuket and Koh Samui typically show greater flexibility during the early pre-sale phase of a project, when sales velocity is the priority. Negotiable parameters include the booking fee amount, the distribution of mid-construction tranches, and the size of the final payment. Flexibility narrows significantly for projects approaching completion or with high occupancy rates.
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