A Letter to Foreign Investors
Currency is the line nobody talks about.
You bought the property. You collected the yield. You sold at a profit. Then the bank turned your baht back into the currency you actually live in, and the number changed. That last step is the one this letter is about.
Consider two investors. Both buy the same Phuket condominium in 2018 for THB 12,000,000. Both hold for seven years. Both sell in 2025 for THB 16,800,000 - a clean 40% capital gain in baht terms. Identical asset. Identical timing. Identical exit.
One converts the proceeds back to Australian dollars when the AUD is soft against the baht. She lands a total return that comfortably beats her home market. The other converts back to US dollars in a year the dollar is strong. He gets a number that looks like he held cash for seven years.
Neither did anything wrong on the property. The difference is the exchange rate at the moment of repatriation - a variable they never owned, never managed, and in most cases never modelled. That is what currency does to realised gains. Quietly. At the very end. After every other decision has already been made.
The Number to Remember
THB movement against your home currency typically adds or subtracts 10-25% of total return over a 5-10 year hold. On long holds, FX is frequently the largest single line in the calculation - larger than yield, larger than capital growth.
Why it happens.
A foreign-owned Thai condominium is, by law, bought with foreign currency that has been converted into baht and remitted into Thailand. The Foreign Exchange Transaction form proving that remittance is the document that lets you sell the unit cleanly and repatriate the proceeds. So the asset enters in baht and the asset exits in baht. Your gain is a baht gain. Always.
The return you actually experience, however, is denominated in the currency you spend - whether that is AUD, EUR, GBP, SGD, USD or anything else. Between purchase and exit, that home currency moves against the baht. Sometimes a little. Sometimes a lot. Over a seven-year hold, "a lot" is the norm, not the exception.
The arithmetic is brutal in its simplicity. A 15% favourable THB move on top of a strong asset can double the realised return. A 15% adverse move can erase the rental yield contribution entirely. The asset did not change. The line item that nobody underwrote did.
What a serious investor does about it.
The honest answer is: you cannot forecast FX, and anyone telling you they can is selling you something. What you can do is refuse to be surprised by it. That is a discipline, not a prediction.
It means modelling FX as a first-order line in your total-return calculation, not as a footnote. It means matching the size of your THB exposure to a level you can hold through a full FX cycle without being forced to convert at the wrong moment. It means giving yourself the option of staged repatriation - selling the proceeds in tranches over 6-18 months rather than all on closing day. And on larger transactions, it means at least pricing what a forward FX contract or an FX-locked distribution programme would cost, even if you ultimately decline it.
None of these techniques are free. Each trades a small piece of yield for a meaningful reduction in tail risk. That is usually a trade worth making.
The Short Checklist
Five FX risks to address before you sign.
- Repatriation timing risk. Your exit FX rate is set on a single day you cannot choose. If the sale is event-driven (divorce, estate, liquidity need), the timing is even less in your control. Plan for it.
- Cycle-mismatch risk. A 3-year hold has FX exposure measured in months. A 10-year hold spans roughly a full currency cycle. Match your hold horizon to a realistic FX-cycle view, not the property cycle alone.
- Yield-erosion risk. A 4-6% net rental yield in THB can be entirely consumed by a 5-7% adverse FX move during the holding period. Underwrite the yield in your home currency, not in baht.
- Hedging-cost risk. Forwards, options and FX-locked programmes carry cost and counterparty risk. They are not free insurance. Price them, compare them, and only deploy when the residual exposure justifies the premium.
- Concentration risk. If THB is already your largest non-home-currency exposure across all assets, adding another Thai property compounds the FX bet. Size accordingly.
You do not have to predict the currency. You only have to refuse to ignore it.
Run the numbers
Model FX as a first-order line, not a footnote.
Pressure-test your Thai property total return with FX, yield, and capital growth side by side.
Open the calculatorIllustrative scenarios using calculator default assumptions. Outcomes vary with market conditions, operator performance and investor inputs.
Q&A
How does currency affect realised capital gains in Thai property? →
Comparison
Global property ROI, compared honestly →