Based on our monitoring of off-plan sales activity across Phuket and Koh Samui, over 70% of foreign buyers purchasing condominiums in 2026 use the instalment schedule offered directly by the developer. This dominance is not accidental: mortgage lending to non-residents in Thailand remains largely inaccessible, leaving developer-structured payment plans as the practical default. Our analysts track deal terms across Bang Tao, Layan, Kamala, Surin, Karon, and Rawai on Phuket, and Bophut, Maenam, Lamai, and Chaweng on Koh Samui. Below we break down the mechanics, costs, and common pitfalls.
Developer instalment financing is a civil contract between the buyer and the development company, not a bank product. The purchase price is split into tranches tied either to construction milestones or a fixed calendar. Developers do not charge explicit interest, but the cost of deferred payment is embedded in a higher per-square-metre price. Based on our estimates, this pricing premium runs from 5% to 15% above the lump-sum cash price, depending on schedule length and the specific developer.
Quick answer
- A standard Phuket developer instalment plan covers 3 to 5 tranches spread over 18 to 36 months during the construction period
- The booking fee is typically 100,000 to 200,000 THB, deducted from the final purchase price
- The first contractual tranche (after signing the sale and purchase agreement) is usually 20% to 30% of the unit price
- The final tranche, 30% to 50% of the price, falls due on handover and title transfer
- No explicit interest is charged, but the instalment price is higher than the cash price - per our estimates, a 5% to 15% premium
- Every incoming transfer from abroad must arrive in foreign currency (USD, EUR, or GBP) with a correctly worded remittance reference, so the receiving Thai bank can issue a Foreign Exchange Transaction (FET) certificate - a document required to register freehold title at the Land Office
Options and scenarios
Option 1 - Standard construction-linked schedule (18 to 24 months)
This is the most common structure in Bang Tao, Layan, and Kamala, where the volume of active off-plan projects is highest. The buyer pays a reservation fee, then 25% to 30% on contract signing, 20% to 25% at a defined construction milestone (typically structural completion), and 40% to 50% on handover. The full cycle closes within 18 to 24 months.
No credit assessment is required - a passport and reservation confirmation are sufficient. The main practical advantage is the absence of explicit financing costs. The main risk is non-refundability: standard Thai developer contracts do not provide for a refund if the buyer fails to pay a subsequent tranche, meaning all prior payments are forfeited.
Option 2 - Extended instalment schedule (30 to 36 months)
Larger developers operating in Surin, Karon, and on Koh Samui (particularly Bophut and Maenam) sometimes offer schedules split into 5 to 8 tranches, with smaller monthly or quarterly payments following the initial deposit. The pricing premium in this variant can reach 10% to 15% above the base cash price. On a unit priced at 5,000,000 THB, that represents an additional cost of 500,000 to 750,000 THB embedded in the contract price.
Option 3 - Post-completion instalment financing
Less common, this structure appears on completed projects or developments with slower sales velocity. The developer offers deferred payment of 30% to 40% of the price over 12 to 24 months after handover. In this variant, explicit interest appears - typically 3% to 7% per annum - or a flat administrative fee added to each instalment. Critically, title transfer does not occur until the final payment is made, meaning the buyer occupies the unit under a lease or licence agreement during the repayment period.
Koh Samui - local market characteristics
The Koh Samui market is smaller and schedules tend to be more negotiable. Developers in Bophut and Lamai have been willing, in cases our team has observed, to accommodate individually structured payment timelines - for example, 6 to 10 tranches over 24 months. Condominium unit prices on Koh Samui average 15% to 25% below comparable locations on Phuket's west coast (as of 2026 data), which reduces absolute currency exposure for buyers paying in foreign currency.
Comparison table
| Parameter | 18-24 month schedule | 30-36 month schedule | Post-completion instalments |
|---|---|---|---|
| Number of tranches | 3 to 4 | 5 to 8 | 6 to 24 (monthly) |
| Booking fee | 100,000-200,000 THB | 100,000-200,000 THB | 100,000-200,000 THB |
| First contractual tranche | 25-30% of price | 20-25% of price | 50-70% of price |
| Final tranche | 40-50% at handover | 30-50% at handover | Monthly after handover |
| Explicit interest rate | None | None | 3-7% per annum |
| Embedded price premium | 5-8% | 10-15% | 5-10% plus interest |
| Title transfer | At final payment | At final payment | After full repayment |
| FET certificate required | Yes, per tranche | Yes, per tranche | Yes, per tranche |
| Typical locations | Bang Tao, Kamala, Layan | Surin, Karon, Bophut | Completed projects, Rawai |
Risks and mistakes
Currency exposure across the payment schedule. Buyers paying in non-THB currencies face exchange rate movement over 18 to 36 months. As an illustration: on a unit priced at 5,000,000 THB, a 10% weakening of the buyer's home currency during the schedule increases the total outlay by the equivalent of that 10% - purely from FX movement, with no change in the baht price. We recommend verifying current rates and hedging options with a licensed currency broker before signing.
Incorrect remittance references. Each incoming transfer from abroad must include: the buyer's full name, the unit number, the project name, and the phrase 'purchase of condominium'. An incorrect or incomplete reference prevents the Thai receiving bank from issuing the FET certificate. Without a complete set of FETs covering the full purchase price, the Land Office will not register freehold title.
Forfeiture of paid tranches on buyer default. Standard Thai developer contracts allow the developer to retain all or a substantial portion of payments made if the buyer withdraws. Based on our review of active contracts in the Phuket market as of 2026, fewer than 20% include any partial-refund clause. This makes it essential to review termination provisions before signing.
Construction delays and capital lock-up. Thai courts enforce developer timelines, but litigation typically takes 12 to 24 months to resolve. A delay extends currency exposure and locks capital in the project without a straightforward exit.
No institutional buyer-deposit protection. Thailand does not operate a statutory system protecting buyer advance payments in residential off-plan sales. Funds transfer directly to the developer's account upon each tranche payment.
FET certificate thresholds. Thai banks issue FET certificates automatically for inward transfers equivalent to 50,000 USD or above (a practical banking threshold, not a statutory requirement). For smaller tranches, banks issue a standard transaction confirmation. For freehold registration purposes, the combined FET documentation must cover at least the value of the ownership share being acquired.
FAQ
Does a Phuket developer provide a mortgage to foreign buyers?
No. Developer instalment financing is a contractual payment deferral, not a mortgage product. The developer holds no security over the unit as collateral and is not subject to banking regulation. Mortgage lending to non-residents does exist at a small number of Thai financial institutions, but entry thresholds typically start from 10,000,000 THB and require documented regional income.
How much is the initial payment when buying a Phuket condo on a developer instalment plan?
The booking fee is typically 100,000 to 200,000 THB, followed by the first contractual tranche of 20% to 30% of the unit price on signing. Combined, a buyer commits roughly 25% to 35% of the total price before construction begins.
Can I send tranche payments in my home currency directly to the developer's Thai account?
No. The Thai bank requires inward transfers in a recognised foreign currency (USD, EUR, or GBP) from an overseas account in order to issue the FET certificate. A transfer arriving in a local currency that has been converted en route by a correspondent bank may not satisfy FET documentation requirements. We recommend converting to USD or EUR before remitting each tranche.
How do I avoid FET certificate problems when paying in tranches?
Each transfer must include the buyer's full name, unit number, project name, and purpose ('purchase of condominium'). The total FET value must match the acquired ownership share. Before the first transfer, confirm the FET issuance procedure directly with the developer's receiving bank - not all banks handle this automatically, and the process varies by institution.
Can I resell a unit bought on instalments before paying all tranches?
Yes, provided the developer contract includes an assignment clause. In the Phuket market, the majority of developer contracts permit assignment for a fee of 1% to 3% of the contract value. The original buyer assigns all contractual rights to the incoming buyer, who assumes the remaining tranche obligations.
What are the hidden costs of developer instalment financing?
The primary embedded cost is the pricing premium - per our estimates, 5% to 15% above the cash price. Additional items to budget for: the assignment fee (1% to 3% if reselling before completion), currency movement across the schedule, and independent legal review of the contract (typically 30,000 to 80,000 THB).
Can the developer change the instalment schedule mid-construction?
A signed sale and purchase agreement fixes the schedule. A unilateral change of payment dates by the developer constitutes a breach of contract. In practice, when construction delays occur, developers often negotiate a proportional extension of the final tranche deadline rather than face formal dispute.
What alternatives exist if a buyer prefers not to use developer instalments?
Three main paths: a full cash payment at signing (delivers the lowest unit price), a loan secured against property in the buyer's home country (rates vary significantly by jurisdiction and prevailing conditions - verify current rates before committing), or financing through regional banks such as UOB or Bangkok Bank (minimum loan thresholds from 10,000,000 THB, with income in Asia typically required).
Are instalment terms on Koh Samui different from Phuket?
Yes. The Koh Samui market is smaller and developers demonstrate more flexibility. Our team has observed schedules of 6 to 10 tranches over 24 months negotiated individually with buyers. Base prices are lower than on comparable Phuket locations, which reduces the absolute currency risk on each tranche.
To summarise: developer instalment financing remains the dominant purchase route for foreign buyers on Phuket and Koh Samui in 2026. When the embedded price premium (5% to 15%) and currency exposure across a 18 to 36 month schedule are factored in, the total effective cost can run 15% to 25% above an equivalent immediate cash purchase. Before signing, we recommend independent legal review of the contract, confirmation of the FET process with the receiving bank, and a review of currency hedging options for planned tranche dates.
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