What the tax system covers

Thai-source income is taxable under the ordinary rules. A person resident in Thailand for the relevant income year can also be taxable on foreign-source income earned from 1 January 2024 and brought into Thailand in that or a later year, subject to applicable exemptions and treaty relief.

References [1][2][3][4]

When you become tax resident

The Revenue Department’s current foreign-income chart uses presence of at least 180 days in the calendar year when income is earned. Thai-source income needs separate analysis regardless of remittance. Work performed while physically in Thailand can create a local-source issue; payment into a foreign account alone does not resolve it.

References [1][2][3][4]

Rates and the tax base

0%–35% progressive personal income tax. Ordinary net taxable income uses bands up to 35%, with the first THB150,000 exempt under the applicable rules. Deductions, allowances, alternative business calculations and special regimes are separate. The rate table is not a conclusion about foreign-income remittances.

References [5]

Private investment gains and business trading

Thai assessable income includes gains from transfers of covered shares, partnership holdings and debt instruments. Specific exchange-traded securities and other statutory exemptions must be assessed separately. Foreign gains also require the residence, year earned and remittance analysis; a trading activity is not automatically a private capital gain.

References [6]

Asset cost basis on arrival

For ordinary foreign-investment gains, the Revenue Department uses sale price less acquisition-date cost. Thailand's residence and remittance tests determine whether and when income is taxed; they do not themselves replace that cost with the investment's value on arrival.

  • Separate the original investment, unrealised appreciation, realised income and later remittance. An asset purchased before 2024 is not the same as income arising before 2024.
  • P.161, as amended by P.162, applies to relevant foreign income arising from 1 January 2024 in a Thai-resident year and remitted in that or a later year. Asset-specific exemptions, special regimes and treaties need separate review.
  • This is the ordinary purchased-investment position, not a verified rule for every inherited asset, foreign trust, business asset or property disposal.
  • A foreign exit-tax assessment does not by itself prove an increased Thai cost. Review treaty relief and any credit independently; no general matching basis adjustment is established here.
  • The deductible starting value on a later sale of inherited or gifted foreign securities has not been established here. Do not infer donor cost, zero cost or market value from an exemption when the asset was received.
Asset or situationStarting value and treatment
Purchased foreign sharesSection 40(4)(ช) taxes the amount exceeding invested capital. RD's FAQ calculates gains transaction by transaction using acquisition-date cost, rather than arrival value.
Investment-fund unitsThe current Thai section 40(4)(ช) includes transfers and redemptions of investment units. Check the fund and exemptions separately; the old English section 42(23) exemption text has been repealed.
Unsold appreciation and later remittanceAn unrealised share increase is not yet the realised gain illustrated in RD's FAQ. Later remittance of realised income is a separate timing test; it does not set acquisition cost.
Original capital and pre-residence savingsTrace capital separately from income using transaction and bank records. A mixed-account remittance cannot safely be labelled entirely principal without evidence.
Immovable property and business assetsQualifying inherited or noncommercial immovable disposals within section 48(4) have separate expense and holding-year rules; business income has separate expense rules. Confirm the provision's scope for foreign property. Do not transplant a share-gain formula or assume arrival appraisal is deductible cost.
Gifts and inheritanceReceipt exemptions do not establish the recipient's later securities basis. Section 48(4)(a) separately provides a 50% expense deduction for covered inherited/gifted immovable disposals; this is not a general market-value step-up.
Departure taxes, treaties and foreign tax creditsThe reviewed Canada–Thailand Article 13 allocates taxing rights, including a former-resident rule, rather than an arrival-value election. Credit eligibility and limits require a separate analysis; other treaties and asset types remain to be checked.
References [7][8][9][10][11][12]

Keep the purchase, gain and remittance dates separate

Build a transaction history before making a transfer. The dates answer different questions; using the portfolio balance when you moved can conceal the information needed for the tax calculation.

Date or recordQuestion it answers
Original purchaseWhat was invested?
Year the income aroseDid the post-2023 rule apply, and were you resident that year?
Transfer into ThailandWhich year and amount enter the remittance analysis?
Foreign tax paymentWhat treaty credit, if any, is available against Thai tax?
References [9][10][11]

The foreign-income change from 2024

Official guidance addresses foreign income earned from 1 January 2024 by a person resident in the relevant year and later brought into Thailand. It distinguishes income earned before 2024 and years of nonresidence. Reconcile the chronology, nature of receipts and any treaty relief rather than treating every international transfer as taxable income or every old account as exempt.

References [1][2][13][3][4]

Programme benefits are specific

LTR categories have different employment and tax features. DTV and Thailand Privilege are not general personal-tax holidays. A company owned abroad introduces further questions about local activity, management, permanent establishment and the owner’s other countries. This draft does not assert a verified absence of Thai CFC legislation or price tax savings without a fact-specific model.

References [1][2][13][3][4]

Use four questions to analyse an overseas transfer

First, is the amount income or a movement of existing capital? Second, if it is income, where is its source? Third, when did it arise and was the recipient Thai resident in that year? Fourth, when and how was it brought into Thailand? The Revenue Department’s post-2024 guidance makes these distinctions important. It does not classify every bank transfer as income, nor does it exempt new earnings because they passed through an old account.

For an investment sale, retain the acquisition cost and sale records so the proceeds can be separated from any gain. For a pension or business distribution, identify the legal category rather than relying on the bank transfer description. Maintain separate supporting schedules for pre-2024 income and income earned in nonresident years; those factual distinctions can be more valuable than choosing a particular transfer service.

References [3][14]

Local work is a different source question

Thailand’s rules address income from employment or business carried on in Thailand, as well as relevant Thai assets. A person physically performing services there should not assume the receipts are foreign-source solely because the client, company or bank account is overseas. The immigration permission for remote work does not itself settle the tax source.

A business owner should map the work performed personally, authority to conclude contracts and management of foreign entities. An employer should consider its own obligations separately from the employee’s personal return. If two jurisdictions tax the same payment, identify the treaty provision and credit mechanism and retain evidence of the foreign tax actually paid. A credit is not automatically equal to every foreign charge.

References [15][3]

LTR relief is category-specific and needs evidence

The BOI material distinguishes the foreign-income benefits for qualifying LTR categories from the 17% employment-income treatment associated with qualifying highly skilled professionals. DTV and Privilege do not confer the same tax package. Establish the person’s category, period of qualification and precise receipt before applying any concession. A family member’s status should not be assumed to copy every tax feature of the principal.

Keep the endorsement and visa records alongside income, travel and tax schedules. Review the position when the job, employer, investment or category changes, and before the five-year qualification review. The current 2026 return materials include a foreign-income declaration; an immigration approval does not remove the need to determine filing obligations. For calculations, use the rules actually in force for the tax year rather than a media report about possible reform.

References [16][17][18][14]

Leaving does not erase the year’s history

Calculate actual days in the departure year and classify income earned while resident. Retain statements linking later remittances to the year and type of earnings. If you will return, funds brought in later may still require analysis under the applicable rules; a flight out is not a general reset.

References [1][2][13][3][4]

The departure year still needs a complete income history

Count actual days for the calendar year and identify income earned during any resident year that may later be remitted. The post-2024 foreign-income guidance means a later transfer can require examination of an earlier income year. Merely waiting until the next year or taking a short trip does not establish that a taxable receipt has disappeared.

Keep the records needed to explain capital transfers, pre-2024 income and income earned while nonresident. If foreign tax was paid, retain assessments and proof of payment, not just a figure in a spreadsheet. A planned return to Thailand should be included in the analysis, especially where the person continues to maintain accounts and transfer money for a household or property.

References [3][14]

Review work and visa arrangements before the final trip

An employment-related permission, LTR endorsement and paid long-stay membership have different consequences when the underlying activity stops. Confirm the requirements for cancellation, notification or continued validity for the particular status. Leaving the country does not necessarily terminate membership costs, and cancelling a permission can affect associated family members.

For LTR, examine whether the category’s employment, income, insurance or investment conditions remain satisfied after the move. For a remote worker, document the final Thai work date and the employer’s location change. A business retaining people, premises or contracts in Thailand needs a continuing local compliance plan. The principal’s departure and a company’s cessation are separate events.

References [17][18][19][15]

Set up the handover for returns and retained assets

Before closing accounts, settle outstanding payroll and operating payments and arrange a reliable way to receive notices or refunds. Give banks accurate new residence and tax information. Retained Thai rental or business income may continue to be relevant even when the individual no longer meets the residence day test.

Compile the final visa history, travel calendar, income schedules, asset records and correspondence with the tax authority. If a foreign business has been managed from Thailand, preserve the history and document the new allocation of authority; changing countries again does not erase prior-year exposure. We assess any departure-related charge by taxpayer and asset rather than interpreting the absence of a broad tax headline as a complete exit opinion. The destination’s treatment of existing companies and gains should be reviewed before arrival.

References [3][15][14]

Foreign companies and income attribution

Current standalone CFC scope not verified; business presence and foreign shareholder rules need separate review.

Departure, migration and continuing obligations

Assess the year income arose, residence history, later remittances and retained Thai business interests.

References [3][4][15][14]
Sources & research notes19 references

Sources supporting this guide. Research draft awaiting editorial review.

  1. Thai MFA: visa measures and Destination Thailand Visa
  2. BOI: Long-Term Resident visa
  3. Thai Revenue Department: foreign income rules from 2024
  4. Revenue Department: personal income tax
  5. Thailand Revenue Department — current-system personal income-tax bands and computation
  6. Thai Revenue Department — taxable income categories including disposal gains
  7. Thailand Revenue Code — current Thai-language sections 38–64
  8. Thailand Revenue Department — foreign-income questions and answers under section 41(2)
  9. Thailand Revenue Department Order P.161/2566, as amended
  10. Thailand Revenue Department Order P.162/2566 — pre-2024 income
  11. Thailand Revenue Department — foreign tax credit calculation guide for individuals
  12. Canada–Thailand Tax Convention — capital gains
  13. Thailand Privilege: official membership packages
  14. Revenue Department: 2026 personal return and foreign-income forms
  15. Revenue Department: Thai and foreign income sources
  16. BOI: 2025 LTR eligibility brochure
  17. BOI Announcement Por 3/2568: LTR qualifications
  18. BOI Announcement Por 4/2568: LTR endorsement and extension process
  19. Thailand Privilege: published membership comparison