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Tax Residence Certificate (RO.22 / Form 6166-equivalent) RO.22

Official RD certificate proving Thai tax residency — required to claim DTA benefits abroad (avoid double taxation on dividends, interest, royalties).

Who

Individuals (≥180 days in Thailand) or Thai-incorporated companies claiming DTA benefits

Service fee

Ask our team

Timeline

Depends on the issuing office

Authority

Revenue Department — International Tax Affairs Division

Legal Basis

Revenue Code Sec. 41; OECD Model Tax Convention Art. 4; Thailand's 61 DTAs

Eligibility

  • Individual: physically present ≥180 days in tax year
  • Company: incorporated under Thai law
  • Active tax filings (PND.90/91/50)

Required Documents

  • Application Form (RO.22)
  • Passport + entry/exit stamps (individuals)
  • Affidavit/Company affidavit
  • Last PND filings
  • Power of Attorney

Procedure

  1. Submit application and supporting documents to the Revenue Department
  2. Revenue Department review
  3. Collect the certificate
  4. Arrange MFA legalisation if required
  5. Check whether the receiving authority also requires embassy attestation

Fee Structure

RD issuance free; MFA legalization THB 800/document; service includes drafting, translation, MoJ certification, MFA submission.

Cross-Border / DTA Notes

Thailand's Apostille Convention enters into force on 28 February 2027. As of September 2026, Thailand does not issue Apostilles; confirm the current MFA and embassy route with the receiving authority.

Related Services

ILC handles e-Filing, certified copies, certified translation and MFA legalisation, then checks whether the receiving authority requires embassy attestation. Thailand's Apostille Convention takes effect on 28 February 2027; until then the existing legalisation chain applies.

Post-Service Policy

If a document is rejected due to a defect in our translation or certification, our team coordinates corrections under our service policy and the terms of your quotation. This is not a guarantee of Revenue Department / MFA / embassy discretion.

Ask about fees — LINE @THAIL · Tel 092-0170000

Contact us
Accountant checking a Thai Ror.Or.22 form against supporting documents

What the certificate is for

It confirms Thai tax residence so you can claim Double Taxation Agreement relief — for example a reduced foreign withholding rate — or present it to overseas banks and authorities.

Requirements for individuals

Presence in Thailand for 180 days or more in the tax year, with evidence of Thai tax filing. Companies use registration and tax filing evidence.

Before applying

Ask the receiving party whether it needs Thailand's Ror.Or.22 or its own form signed by the Revenue Department, specify the correct tax year and treaty country, and prepare your passport or ID card.

Frequently asked questions

Is it valid for every country?

Treaty relief applies only to countries with a Thai DTA; check the Revenue Department list.

Does it need translation or legalisation?

It depends on the destination; some require Department of Consular Affairs certification. Thailand's Apostille takes effect 28 Feb 2027.

Send your documents for our accounting team to review

Call 092-0170000 · LINE @THAIL · contact@thailaw-accounting.co.th

Fees: ask our team for a quote

Sources

Reviewed by the accounting team at Thai Law & Accounting Services · Last reviewed 4 Oct 2026 · General information, not tax or legal advice for your specific case

Go deeper on Tax document certification

These guides outline possible certification steps; confirm the receiving authority's current requirements before filing:

Not sure which route applies? Send us the scan — LINE @THAIL · 092-0170000 · contact@thailaw-accounting.co.th

Documents usually required

  • Freshly issued original Thai civil or corporate record from the issuing office
  • Complete English translation of every page, with the translator's statement of accuracy
  • Copy of the document holder's passport or Thai national ID card
  • Power of attorney with ID copies of both parties if someone else files on your behalf

Common reasons a bundle is rejected

  • Residency certificates are issued for a specific tax year and cannot be reused.
  • Treaty claims require the article to be cited correctly on the form.
  • Spell every name exactly as it appears in the passport, across every document in the same bundle.

Prefer not to handle the chain yourself? Send the scans and we run every step for you, from translation to the final endorsement.

How the process runs — Tax document certification

  1. Obtain a freshly issued original from the office that produced the record and check that every page is present.
  2. Prepare a complete translation with the translator's statement of accuracy attached.
  3. File for legalization at the Department of Consular Affairs, Ministry of Foreign Affairs, with the original and the translation together.
  4. Complete the next certification layer required by the destination country — Apostille, or legalization at that country's embassy in Thailand.
  5. Collect the finished bundle, scan a full copy for your records, then submit it in the format the receiving authority specifies.

Fees and processing times are set by each authority and vary by document and destination — confirm them with the responsible agency.

Handling it yourself vs letting ILC run it

AspectDoing it yourselfWith ILC
Working out which steps applyYou read each authority's rules yourself, and usually learn a step was missing only after the bundle is refused.Our advisers review the documents before work starts and sequence translation, notarisation, MFA, and embassy in one pass.
Time spent filingRepeat trips to each office, queueing and collecting in person.We file on your behalf; you send scans and receive the finished set by post or courier.
Risk that the translation is refusedAgency names, job titles, and the certification wording often do not match what the receiving office accepts.We use terminology and certificate formats the receiving authority has accepted before, with two-stage proof-reading.
If the bundle is rejectedYou diagnose the cause and refile yourself, losing a full cycle.We identify the cause, correct it, and refile without you starting over, with progress reported along the way.

What clients typically use this for

  • Tax residency certificates
  • Double-tax treaty claims
  • Overseas audit and reporting

An advisor, not only a document processor

Before any work starts, our team assesses how many certification layers your document actually needs, which authorities are involved, and the correct order for the office you will really file with. One step out of order usually means restarting the whole bundle. We work to recognise how each authority rejects files and prevent it up front.

  • The certification route is matched to the receiving authority before work begins.
  • Rejection risks are checked, from name spelling to document validity windows.
  • The filing sequence is planned around the deadline you actually have.

Consult us at LINE @THAIL · 092-0170000 · contact@thailaw-accounting.co.th

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