Between 2023 and 2025, the PLN/THB exchange rate moved across a range of roughly 8.2 to 9.8 THB per 1 PLN (indicative figures; sources: NBP, Bank of Thailand). On a 5 million THB condominium in Kamala or Bophut, the spread between those two extremes translates to more than 100,000 PLN of additional cost or saving - purely from the rate, not from any change in the property itself. Our analysts track this exposure daily when working with investors entering the Phuket and Koh Samui markets.
Converting a Thai asking price from THB into your home currency is only the starting point. Developer payment schedules in Thailand typically run across 12 to 24 months and involve four to eight separate tranches, each landing at a different point in the market cycle. Based on our estimates as of 2026, a buyer committing to an 8 million THB condominium and paying in four instalments can end up spending anywhere from approximately 820,000 PLN to 960,000 PLN for the same unit - depending entirely on how the rate moves between reservation and handover.
The sections below set out the mechanics of this exposure, the tools available to manage it, and the recurring mistakes we observe in practice when funds are transferred from Europe to Thailand.
Quick answer
- The PLN/THB rate tracked a band of roughly 8.2 to 9.8 THB per 1 PLN over 2023-2025 (indicative; NBP / Bank of Thailand data)
- On a 5 million THB condo, that range produces a cost spread of approximately 510,000 PLN (at 9.8) to 610,000 PLN (at 8.2) - a gap of around 100,000 PLN
- Developer schedules typically comprise 4 to 8 tranches over 12 to 24 months, multiplying total currency exposure across time
- The Thai FET (Foreign Exchange Transaction) form requires funds to arrive from abroad in a foreign currency; the receiving Thai bank applies its own spread on conversion
- Specialist FX brokers charge spreads of 0.3 to 0.8%, compared with 1.5 to 3.0% typical of standard SWIFT transfers from European retail banks (indicative, as of 2026)
- Forward contracts and limit orders are available through selected FX brokers for amounts above approximately 10,000 USD equivalent
Options and scenarios
Scenario 1 - Single lump-sum payment at a stable rate
A buyer acquires a completed freehold condominium in Bang Tao for 6 million THB. The full amount is transferred in a single payment at a rate of approximately 9.0 THB/PLN. Indicative cost: around 667,000 PLN before transfer fees. Currency risk is concentrated at a single point in time; the only variable is the spread charged by the bank or FX broker used.
Scenario 2 - Instalment schedule with a weakening PLN
An off-plan unit in Surin is priced at 8 million THB with a standard schedule: 20% on reservation, 30% on foundations, 30% on structure, 20% on handover - payments spread over 18 months. If PLN weakens from 9.2 to 8.4 THB/PLN over that period, the total cost rises from roughly 870,000 PLN to approximately 952,000 PLN. The difference of around 82,000 PLN represents pure currency drag against the original budget estimate.
Scenario 3 - Instalment schedule with a strengthening PLN
The same 8 million THB unit, but PLN strengthens from 9.0 to 9.8 THB/PLN across the payment window. Total cost falls from roughly 889,000 PLN to approximately 816,000 PLN. The buyer effectively saves over 70,000 PLN without any active investment decision - the gain comes entirely from rate movement.
Scenario 4 - Partial hedging via a forward contract
The buyer locks in 50% of anticipated future payments through a forward contract at 9.0 THB/PLN with an FX broker. The remaining 50% is purchased at spot rate on each payment date. If the spot rate moves 5% in either direction, the effective all-in cost deviates by roughly 2.5% rather than the full 5%. The cost of the hedge itself is typically 0.5 to 1.5% of contract value (indicative figure, varies by broker and tenor).
Comparison table
| Parameter | SWIFT from European bank | FX broker (e.g. Wise, Xe) | Forward contract via FX broker |
|---|---|---|---|
| FX spread | 1.5 - 3.0% | 0.3 - 0.8% | 0.5 - 1.5% (includes forward premium) |
| Transfer fee | 80 - 200 PLN | 0 - 50 PLN | Included in spread |
| Settlement time | 2 - 5 business days | 1 - 2 business days | Pre-agreed settlement date |
| Minimum amount | None | None or 1,000 PLN | Approx. 10,000 USD equivalent |
| Rate control | None (bank daily rate) | Limit order / rate alert | Rate locked in advance |
| FET document | Yes - Thai bank issues on receipt | Yes - correct transfer reference required | Yes - funds must arrive from abroad |
| Currency risk | Full (spot) | Full, but lower spread cost | Partially hedged |
All figures are indicative as of 2026. Our team verifies current operator conditions before each transaction.
Risks and mistakes
1. Incorrect transfer reference blocking the FET. Funds used to purchase a freehold condominium must arrive at a Thai bank account from abroad, denominated in a foreign currency, with a precise transaction description - for example: 'purchase of condominium unit'. We have documented cases where European banks used generic descriptions ('private transfer', 'personal remittance') that made it impossible for the Thai bank to issue a valid FET form. Without an FET, a foreign buyer cannot register freehold title at the Land Department and cannot legally repatriate sale proceeds in the future.
2. Converting to THB before the international transfer. If funds leave a European bank already denominated in THB, correspondent banks add an extra spread on a thinly traded pair, and the Thai receiving bank may refuse to issue an FET because the inflow does not qualify as a 'foreign currency' receipt. Our analysts recommend sending transfers in USD, EUR, or GBP.
3. Ignoring ongoing currency exposure across an instalment schedule. Many buyers fix their budget at the rate prevailing on reservation day and never revise it. Over an 18-month payment schedule, an 8 to 10% move in PLN/THB is not a tail-risk scenario - it is within the historical norm for this pair.
4. No time-diversification of exchange transactions. Converting the entire purchase amount at a single point in time is, in effect, a concentrated currency bet. Spreading conversions across three to five tranches (a dollar-cost averaging approach) statistically reduces deviation from the average rate over the period.
5. Overlooking the return transfer on eventual sale. When the property is sold, proceeds will need to be converted back from THB. The rate at that future point may be materially less favourable than at purchase, compressing the real return in the buyer's home currency. The FET obtained at purchase is also the document required to legally remit those sale proceeds abroad.
6. Over-relying on currency forecasts. No model predicts PLN/THB with precision useful for property planning. We review institutional forecasts routinely; on a 12-month horizon, forecast errors of 5 to 15% are common. Planning a purchase around a specific rate forecast introduces its own risk layer.
FAQ
What is the FET form and why does it matter for buying property in Thailand?
The FET (Foreign Exchange Transaction) form is a document issued by a Thai bank confirming that funds have arrived from abroad in a foreign currency. It is required to register freehold ownership at the Land Department and to legally repatriate capital when the property is later sold. Without a valid FET, a foreign national cannot register a condominium in their own name under freehold title.
Is there a minimum amount that triggers the FET requirement?
The FET is formally issued for foreign-currency inflows equivalent to at least 50,000 USD (or equivalent), in line with Bank of Thailand regulations. For smaller amounts the Thai bank may issue a credit advice note instead. In practice, condominium prices in Phuket and Koh Samui almost always exceed this threshold.
Is it better to send the transfer in PLN, EUR, or USD?
Our analysts recommend sending in USD or EUR. Transfers in PLN carry higher spreads through correspondent banks, and Thai banks may not classify a PLN inflow as a qualifying foreign currency for FET purposes. USD remains the most widely used currency for international property transfers into Thailand.
How much does a SWIFT transfer from a European bank to Thailand cost?
Indicative costs as of 2026: a bank fee of roughly 80 to 200 PLN plus a 1.5 to 3.0% FX spread on the amount transferred. On a transfer equivalent to 200,000 USD, the combined cost (spread plus fee) can reach 3,000 to 6,000 USD. Specialist FX brokers can reduce this by 50 to 70% based on current market estimates.
Can I lock in a PLN/THB rate for future instalment payments?
Yes. Selected FX brokers offer forward contracts or limit orders on PLN/THB, typically routed via a USD cross. The standard minimum is around 10,000 USD equivalent and tenors typically extend to 12 months. Forward premium cost is indicatively 0.5 to 1.5% of contract value.
How large is the real currency risk on a 5 million THB condo purchase?
At the historical PLN/THB volatility of roughly 8 to 12% per year, the THB cost of a 5 million THB unit remains constant while its PLN equivalent can shift by 40,000 to 60,000 PLN over 12 months. For context, our data sets show that gross rental yields for condominiums in Bang Tao or Chaweng run at approximately 5 to 7% of property value annually - meaning currency movement alone can absorb an entire year of rental income.
Will a Thai developer accept payment in PLN?
No. Thai developers settle transactions in THB. Funds must arrive at the developer's Thai bank account in a foreign currency (typically USD or EUR), where conversion to THB takes place. PLN is not accepted as a direct settlement currency.
What happens if I have no FET document when I eventually sell the property?
Without an FET, the Thai bank will decline to transfer sale proceeds abroad. The seller would be left either spending the funds within Thailand or pursuing alternative arrangements that are less straightforward. This is among the most frequent procedural errors our team identifies - buyers who omitted the FET step at purchase discover the problem only when they try to exit.
Does the exchange rate affect Thai property sale taxes?
Thai transaction taxes - withholding tax, specific business tax, and the transfer fee - are all calculated in THB on the Thai transaction value. The exchange rate does not affect the Thai tax amount. It does, however, affect the real gain in PLN terms, which may be subject to capital gains or income tax reporting in the buyer's country of tax residence.
How often should I revise my budget estimate during a developer instalment schedule?
Based on our monitoring, we recommend updating cost estimates before each instalment payment, and at minimum once per quarter. The PLN/THB rate can move 3 to 5% within a single quarter; on a 2 million THB tranche, that translates to a difference of tens of thousands of PLN relative to the original projection.
Researching property in Phuket or Koh Samui? Get in touch - our analysts will prepare a data brief for your shortlisted location.