Thai Personal Income Tax Counsel for Foreigners — 180-Day Residency, Paw.161/2566 + Paw.162/2566, Thai TIN, Phor.Ngor.Dor. 90/91 Filing, DTA Article 4 Tie-Breaker, LTR Visa Tax Exemption, FATCA W-8BEN/W-9 and CRS Self-Certification

Tax-residency determination — the 180-day rule

• **§ 41 paragraph 3**: any person present in Thailand for 180 days or more in a tax year is a Thai resident — counted on the calendar year, not a rolling 12 months
• **Day counting**: any portion of a day in Thailand counts as a full day; arrival and departure days both count; airside transit without passing immigration does not count
• **Evidence**: passport entry / exit stamps, TM.6 departure cards, TM.30 24-hour accommodation reports, Immigration Bureau biometric records
• **Border-run loophole closed**: from 2023 visa-exempt entries by land are capped at two per calendar year; air entries remain unlimited but trigger enhanced inspection
• **Arrival / departure years**: only days physically in Thailand within that calendar year count — moving on 1 August and staying through 31 December = 153 days = non-resident that year, but resident the next year if the 180-day threshold is met
• **No split-year treatment**: unlike the UK SRT, Thailand treats a person as resident or non-resident for the entire calendar year
• **Dual residence**: resolved by the DTA Article 4 tie-breaker for treaty purposes, but does not eliminate domestic-law residence in either state

Paw.161/2566 + Paw.162/2566 — the new foreign-source rules

**Paw.161/2566 (15 September 2023)** — the Revenue Department reinterprets § 41 paragraph 2: foreign-source assessable income received by a Thai tax resident is taxable in Thailand when remitted in **any** year. Effective for remittances from 1 January 2024 onward. The prior interpretation (Paw.43/2528, in force since 1985) only taxed remittance in the year of accrual; waiting one year created an exemption (the old loophole).

**Paw.162/2566 (20 November 2023)** — savings clause: income that **accrued** before 1 January 2024 is grandfathered and exempt regardless of remittance timing. **Proof**: bank statements, investment statements and foreign tax returns showing the accrual date. **Best practice**: open a new foreign account and move pre-2024 funds into it, supported by an affidavit attesting to the pre-2024 origin — a bright-line test that prevents commingling with post-2024 income.

**Worked examples**: (1) USD 60,000 US pension received in 2023, remitted in 2025 → exempt (Paw.162); (2) USD 60,000 US pension received in 2024, remitted in 2027 → taxable in Thai tax year 2027 (Paw.161), with possible Foreign Tax Credit for US tax paid in 2024; (3) USD 100,000 Apple share gain realised 15 December 2023, remitted in 2026 → exempt (pre-effective).

**DTA override**: where a DTA reserves taxation to the source state (e.g. Article 18 / 20 Pensions in the Thailand–US treaty), the DTA prevails over domestic law (§ 3 of the Tax Procedure Act B.E. 2480 + Vienna Convention on the Law of Treaties Article 26).

**LTR Visa carve-out**: Royal Decree No. 743 B.E. 2565 grants a 100 percent exemption on foreign-source income for the Wealthy Global Citizen, Wealthy Pensioner and Work-from-Thailand Professional categories — Royal Decree outranks Departmental Instruction in the Thai legal hierarchy.

Filing calendar — TIN, Phor.Ngor.Dor. 90/91, Ror.Or.21, FATCA W-Forms, CRS

• **Thai TIN application** — Revenue Department district or provincial office; passport plus work permit (or visa + accommodation); issued same day; no fee
• **Phor.Ngor.Dor. 90** (multi-source) or **91** (employment + at most one other) — due **31 March** paper or **8–9 April** e-filing of the following year; an 8-day extension is available
• **Phor.Ngor.Dor. 94** — mid-year return for assessable income under §§ 40(5)–(8) over THB 60,000 — due **30 September**
• **Certificate of Residence (Ror.Or.21)** — for outbound DTA treaty-benefit claims; Revenue Department Headquarters, Policy and Planning Bureau; 7–14 day turnaround; THB 200 fee; bilingual Thai-English; valid one calendar year
• **FATCA W-Forms**: W-9 for US persons (SSN/ITIN); W-8BEN for non-US beneficial owners (with DTA treaty claim) — 3-year validity
• **CRS Self-Certification** — required for every new account opening at Thai and foreign financial institutions; state tax residence and TIN for every country of residence
• **FBAR (FinCEN 114)** — US persons with aggregate non-US accounts over USD 10,000 at any point in the year; due 15 April with automatic 15 October extension; non-willful penalty USD 10,000+ per account per year
• **Form 8938 (FATCA Individual)** — US persons in Thailand with foreign financial assets over USD 200,000 (year-end) or USD 300,000 (any time) — filed with Form 1040
• **Record retention** — 10 years (Revenue Code § 87 + AMLA § 22 — 5 years normally, 10 years recommended for cross-border + suspicious transactions)

DTA Article 4 tie-breaker and Foreign Tax Credit optimisation

Thailand has 61 active income tax treaties (including China, US, UK, Germany, France, Australia, Japan, Singapore, Hong Kong — full list on the Revenue Department site). Most follow the **OECD Model Convention** or UN Model — Article 4 (Residence) supplies a tie-breaker when an individual is dual-resident.

**Tie-breaker order** (OECD Article 4(2)): (1) **Permanent Home** — any dwelling continuously available, including long-term rentals; if available in both states, proceed; (2) **Centre of Vital Interests** — closer personal and economic relations (family, occupation, property, social ties); (3) **Habitual Abode** — where the individual customarily stays; (4) **Nationality**; (5) **Mutual Agreement Procedure (MAP)** — Competent Authorities of both states negotiate.

**Article 23 Foreign Tax Credit** — when foreign tax has already been paid, a Thai tax resident may credit it against Thai tax — most DTAs use the credit method; UAE and certain Gulf treaties use the exemption method. Retain foreign tax receipts and foreign tax returns as evidence.

**Article 18 / 20 Pensions** — many DTAs reserve pension taxation to the source state (e.g. Thailand–US Article 20 reserves US Social Security exclusively to the US — no Thai tax even on remittance).

**Limitation on Benefits (LOB)** — post-BEPS Action 6 treaties include LOB clauses preventing treaty shopping; benefits are reserved to a 'qualified person' (individual resident, listed company, substantial-activity entity). Always confirm qualification before claiming.

LTR Visa and Smart-T — compliant high-skill tax carve-outs

• **LTR (Long-Term Resident) Visa** — Royal Decree No. 743 B.E. 2565 issued under the Revenue Code for rate reduction and exemption
• **Wealthy Global Citizen** — assets >= USD 1M + investment in Thailand >= USD 500K (government bond, FDI or real estate) → **100% exemption on foreign-source income**
• **Wealthy Pensioner** (age >= 50) — pension or stable income >= USD 80K per year + health insurance >= USD 50K (or USD 100K deposit) → **100% exemption on foreign-source income**
• **Work-from-Thailand Professional** — salary from foreign employer >= USD 80K per year (or 40K + master's / IP) + employer must be a listed company or have USD 150M revenue → **100% exemption on foreign-source income**
• **Highly-Skilled Professional** — employment in BOI 10+S-Curve industries with salary >= USD 80K (or 40K + master's) → **17% flat PIT** on Thai-source income (replacing the 0–35% progressive rate)
• **LTR overrides Paw.161/2566** — Royal Decree outranks a Departmental Instruction in the Thai legal hierarchy; LTR exemption holders are unaffected by Paw.161 (confirmed by the Revenue Department's February 2024 Q&A)
• **Smart-T Visa** — Royal Decree No. 666 B.E. 2563 — tech, startup and investor track — 4 years with family; no standalone tax carve-out but often pairs with BOI or EEC tax incentives

Risk shields and compliance — non-negotiable rules

• No fabricated passport stamps or travel records to engineer <180 days — Criminal Code § 264 + Revenue Code § 37: 3 months to 7 years' imprisonment plus 100–200% surcharge
• No false Certificate of Residence (Ror.Or.21) — equivalent criminal exposure plus Lawyers Council Ethics § 18 (disbarment)
• Never ignore CRS Self-Certification — FATCA / CRS rules allow the bank to close the account and report the customer as a 'recalcitrant account holder' to AMLO
• No cash smuggling above USD 20,000 at customs (breach of Customs Notification + AMLA § 13) to avoid FET; structuring (smurfing) into smaller amounts breaches AMLA § 22
• No Thai nominee bank accounts — breach of AMLA + Banking Act § 31
• No sham DTA tie-breaker certification based on a non-existent Permanent Home or fabricated Centre of Vital Interests — MAP review and BEPS reporting will detect the manipulation
• No use of Paw.162/2566 without a document trail proving pre-2024 accrual — the Revenue Department may audit back 5 years (normal) or 10 years for willful evasion (§ 19 bis)
• No late filing of Phor.Ngor.Dor. 90/91 — THB 2,000 per return + 1.5% per month interest + 100–200% penalty if audit detects under-reporting
• No FBAR / Form 8938 omission for US persons — IRS penalty USD 10,000–100,000 per account per year (willful = 50% of account balance)
• No contingency fee — Lawyers Council Ethics § 11
• PDPA § 26 — tax and financial data are sensitive personal data: AES-256 encryption + audit logging + need-to-know access only