Tax Guide for Foreigners

Tax residency in Thailand is triggered by the 180-Day Rule, which aggregates all days spent in Thailand within a calendar year (January 1 to December 31). If you are physically present in Thailand for 180 days or more during any calendar year, you are considered a Thai tax resident.

As a tax resident, you are liable for Personal Income Tax (PIT) on both Thai-sourced income and foreign-sourced income that is remitted into Thailand. This is a significant change from the pre-2024 rules, where only income remitted in the same tax year was subject to PIT.

Under Departmental Instructions Paw 161/2566 and 162/2567, foreign income earned after January 1, 2024, is taxable if remitted into Thailand within the same or subsequent years. This effectively closes the previous loophole where taxpayers could defer remittance to a following year to avoid taxation.

Long-Term Resident (LTR) visa holders currently remain the only group with a statutory exemption from taxation on foreign-sourced income, granted under Royal Decree No. 743. This makes the LTR visa particularly attractive for high-net-worth individuals who receive significant foreign income.

The exemption applies regardless of when the income was earned or when it is remitted to Thailand. However, LTR holders are still liable for PIT on Thai-sourced income (income earned from work or businesses within Thailand).

Note that Thai Privilege (Elite) visa holders do not receive this tax exemption. The Privilege visa is a residency programme, not a tax-advantaged instrument.

For the 2025 tax year (income earned January-December 2025), the filing deadlines in 2026 are:

• Paper Filing: March 31, 2026
• E-Filing (online): April 8, 2026

Filing is done through the Thai Revenue Department's online portal or at local Revenue Department offices. You will need your Thai tax ID number, which can be obtained from any Revenue Department branch with your passport and proof of address.

Thailand uses a progressive PIT rate from 0% to 35%, with the first 150,000 THB of assessable income exempt from tax. Various deductions and allowances are available depending on your circumstances.

American citizens benefit from the US-Thai Treaty of Amity, which grants the right to hold majority shares (minimum 51%) and directorships (minimum 50% of the board) in Thai companies. This exempts US-owned businesses from most Foreign Business Act restrictions that otherwise limit foreign ownership to 49%.

However, certain activities remain restricted even under the Treaty:

• Communications and transportation
• Banking involving depository functions
• Land ownership or natural resource exploitation
• Fiduciary functions and liberal professions
• Domestic trade in indigenous agricultural products

The Treaty of Amity is a powerful tool for US entrepreneurs but does not override the Land Code Act's restrictions on foreign land ownership.