Poland-Thailand Double Taxation: 7 Key Facts for Property Investors in 2026

Buying a condominium in Bangkok at 5 million THB (approximately 570,000 PLN) exposes a Polish tax resident to between 8 and 12 separate fees and taxes - some levied in Thailand, some in Poland, and several effectively in both countries simultaneously. The absence of a double taxation treaty between Poland and Thailand makes this considerably more complex than investing in Spain, Portugal, or other treaty-covered jurisdictions.

For a Polish tax resident, the practical consequence is straightforward: every baht of rental income and every capital gain from the sale of Thai property must be declared in a Polish personal income tax return. Without a bilateral tax convention, the only available relief is the proportional deduction method under Polish PIT law (Article 27, Section 9). This article breaks down the full picture.

Quick answer

• No double taxation treaty exists between Poland and Thailand as of 2026. Thailand does not appear on Poland's list of bilateral tax convention partners.
• Transfer fee in Thailand is 2% of the official appraised value, conventionally split equally between buyer and seller.
• Withholding tax on property sales in Thailand is calculated progressively on a personal income tax scale and depends on the holding period and transaction value.
• Specific Business Tax (SBT) is 3.3% and applies when a property is sold within 5 years of acquisition (based on title deed registration dates).
• Stamp duty is 0.5% of the transaction value, but only applies when SBT has not been charged - the two are mutually exclusive.
• In Poland, rental income from Thai property is taxed at a flat rate of 8.5% on annual revenue up to 100,000 PLN, and 12.5% on the excess, with proportional deduction of tax paid in Thailand.

Options and scenarios

Scenario 1: Buying a Bangkok condominium at 5 million THB

A buyer at this price point typically bears the following costs:

• Transfer fee (buyer's half): 1% of appraised value, approximately 50,000 THB
• Legal fees and due diligence: approximately 30,000-80,000 THB
• Sinking fund contribution: a one-off payment of approximately 500-800 THB per sqm
• Common area maintenance fee (ongoing, not a tax): 40-80 THB per sqm per month

The seller at the same transaction bears:

• Transfer fee (seller's half): 1%, approximately 50,000 THB
• Withholding tax: calculated progressively; for a 5 million THB sale held for 3 years, the estimated range is 75,000-150,000 THB
• SBT at 3.3% if sold within 5 years of acquisition: 165,000 THB, OR
• Stamp duty at 0.5% if sold after 5 years: 25,000 THB

Scenario 2: Rental income of 25,000 THB per month

Annual gross revenue: 300,000 THB (approximately 34,200 PLN at 1 THB = 0.114 PLN).

In Thailand: Rental income from Thai property is treated as Thai-source income regardless of the owner's tax residency status. Foreign nationals residing in Thailand for fewer than 180 days per year are not Thai tax residents, but the income remains subject to Thai taxation. Commercial tenants may be required to withhold 5% at source.

In Poland: Private rental income is taxed on a flat-rate basis - 8.5% on revenue up to 100,000 PLN and 12.5% on the excess. On 34,200 PLN of annual revenue, the Polish tax liability is approximately 2,907 PLN. Against this, the investor may proportionally deduct Thai withholding tax paid - at 5% (approximately 15,000 THB, or 1,710 PLN), the net Polish liability is roughly 1,197 PLN.

Note: these figures are indicative. Individual circumstances vary - always consult a tax adviser specialising in international property taxation before filing.

Scenario 3: Cambodia as an alternative market

Cambodia imposes the following property-related taxes:

• Transfer tax on property registration: 4% of transaction value (paid by the buyer)
• Annual property tax: 0.1% of value exceeding 100 million KHR (approximately 25,000 USD)
• Rental income tax for non-residents: 10% of gross rental income

Poland has no double taxation treaty with Cambodia either. The same proportional deduction method applies, making the Polish reporting obligations structurally identical to the Thailand scenario.

Comparison table

Parameter	Thailand	Cambodia	Notes for international investors
Transfer fee	2% (typically split 50/50)	4% (paid by buyer)	Entry costs are higher in Cambodia
Withholding tax on sale	Progressive PIT scale	20% of capital gain	Thailand: depends on holding period
Specific Business Tax	3.3% (sale within 5 years)	No equivalent	Incentivises holding at least 5 years
Stamp duty	0.5% (when SBT not charged)	0.1% on title documents	In Thailand, SBT and stamp duty are mutually exclusive
Rental tax (non-resident)	5-15% WHT at source	10% flat rate	Polish residents must still report in Poland
Annual property tax	Max 0.3% (residential)	0.1% above threshold	Thailand has a higher exemption threshold
Double taxation treaty with Poland	None	None	Proportional deduction method applies
Settlement currency	THB	USD / KHR	Convert to PLN using the central bank rate from the prior business day

Risks and mistakes

1. Assuming that tax paid in Thailand eliminates Polish liability. This is the single most common error. Without a bilateral treaty, there is no automatic exemption. A Polish tax resident must declare the income in Poland and can only apply a proportional deduction for foreign tax paid.

2. Overlooking Thailand's 2024 tax rule changes. Thailand expanded the scope of taxation on foreign-sourced income remitted into the country. If you qualify as a Thai tax resident (more than 180 days per year in Thailand), the new rules may affect your overall tax position.

3. Treating the 50/50 transfer fee split as a legal requirement. It is not. The conventional split is purely a matter of negotiation. Developers selling off-plan units frequently pass 100% of the transfer fee to the buyer in the fine print of the purchase agreement.

4. Using the wrong exchange rate for Polish tax reporting. Rental income and capital gains must be converted to PLN at the average rate published by the National Bank of Poland (NBP) for the last business day preceding the date on which the income was received. An incorrect rate triggers amendments and interest charges.

5. Failing to obtain Thai withholding tax documentation. To claim the proportional deduction in Poland, you need an official Thai withholding tax certificate (forms Phor.Ngor.Dor. 53 or 54). Without this document, the Polish tax authority may disallow the deduction entirely.

6. Underestimating the sinking fund cost. The sinking fund is not a tax, but it is a mandatory one-off payment of typically 40,000-100,000 THB at the time of condominium purchase. This upfront cost directly reduces the effective yield in the first year of ownership.

7. Ignoring ongoing common area fees in yield calculations. Monthly maintenance fees of 40-80 THB per sqm are a recurring cost that must be factored into net yield projections, particularly on smaller units where the fee represents a higher share of monthly rent.

FAQ

Does Poland have a double taxation treaty with Thailand?

No. As of 2026, Poland has no active double taxation agreement with Thailand. Polish tax residents apply the proportional deduction method under Article 27, Section 9 of the Polish PIT Act. This allows foreign tax paid to be offset against the Polish liability, but does not exempt the income from Polish reporting.

What is the transfer fee when buying property in Thailand?

The transfer fee is 2% of the officially appraised value of the property. By convention, buyers and sellers each pay half, but this split is negotiable - it is not mandated by Thai law, and some developers pass the full amount to the buyer.

How is Thai rental income reported for Polish tax purposes?

Rental income from property in Thailand is declared in Poland on a flat-rate (ryczalt) basis: 8.5% on annual revenue up to 100,000 PLN and 12.5% on the excess. The Polish tax is then reduced proportionally by any withholding tax paid in Thailand, provided the investor holds an official Thai withholding tax certificate.

Does Cambodia have a double taxation treaty with Poland?

No. Cambodia, like Thailand, has no bilateral tax convention with Poland. The proportional deduction method applies in exactly the same way.

Who pays Specific Business Tax in Thailand?

SBT at 3.3% is levied on the seller and applies when a property is sold within 5 years of the original acquisition date as recorded in the land registry. Once the 5-year threshold is passed, stamp duty at 0.5% applies instead.

What is the annual property tax in Cambodia?

Cambodia levies an annual property tax of 0.1% on the portion of a property's value exceeding 100 million KHR (approximately 25,000 USD). Properties valued below this threshold are exempt.

Can double taxation on Thai property be avoided entirely?

Not entirely, but it can be minimised. The proportional deduction method ensures that tax paid in Thailand reduces the Polish liability on the same income. The key requirement is maintaining complete documentation of all tax payments made in Thailand.

What additional costs does a condo buyer face in Thailand?

Beyond the buyer's share of the transfer fee, a condominium buyer typically pays: a sinking fund contribution (500-800 THB per sqm), legal and due diligence fees (30,000-80,000 THB), ongoing common area maintenance fees (40-80 THB per sqm per month), and any international wire transfer costs including SWIFT fees and currency exchange spreads.

What documents are needed to claim a Thai tax deduction in Poland?

The core document is the official Thai withholding tax certificate (Phor.Ngor.Dor. 53 or 54), which must be issued by the payer or the Thai Revenue Department. Without this, the Polish tax authority can disallow the foreign tax deduction.

Is it better to invest in Thailand or Cambodia from a tax standpoint?

Neither country has a tax treaty with Poland, so the reporting framework in Poland is identical. Thailand offers lower entry costs (2% transfer fee vs. 4% in Cambodia) but imposes SBT if the property is sold within 5 years. Cambodia's rental tax for non-residents is a flat 10%, which is simpler to model. The choice should be driven by investment strategy and market fundamentals, not tax rates alone.

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