Thai Certificate of Residence (RO.22) Guide 2026

A Thai certificate of residence for tax purposes (often called the RO.22, in Thai หนังสือรับรองการมีถิ่นที่อยู่เพื่อการรัษฎากรในประเทศไทย) is a letter from the Revenue Department confirming that an individual or a company was a Thai tax resident in a given tax year under the double tax agreement with a named country. Foreign payers, banks and tax authorities ask for it before they apply a reduced treaty rate or refund tax withheld abroad. An individual can obtain it only after filing and paying the Thai personal income tax return for that year and showing at least 180 days in Thailand; a Thai company applies with its tax ID card and its DBD registration documents.

The request comes up more often since 2024. Thailand now taxes residents on foreign income they bring into the country, so more foreigners living here file a Thai return, and their home country, broker or pension fund then asks for proof that Thailand is where they are resident. Thai companies receiving dividends, interest, royalties or service fees from abroad face the same request from the foreign payer.

This guide explains what the certificate is, who qualifies, the documents the Revenue Department asks for in 2026, the steps and realistic timing for individuals and companies, and the mistakes that delay an application. For the Thai tax rules themselves, see our guide to tax law for foreign companies in Thailand.

1. The certificate of residence at a glance

What it is	A Revenue Department letter, in English, stating that the person or company is a resident of Thailand for tax purposes in a stated taxable year under the double tax agreement between Thailand and a stated country
Issued by	The Revenue Department, Ministry of Finance
Who can apply	Individuals who are Thai tax residents, and companies registered in Thailand; an agent can apply with an authorisation letter
Individual conditions	At least 180 days in Thailand in the calendar year, and the personal income tax return (PND 90 or PND 91) for that year filed, with any tax paid
Company documents	Tax ID card, certificate of incorporation from the Department of Business Development (DBD), company name, address and business in English
Scope	One taxable year and one treaty country per certificate; a new one is needed for each year and each country that asks
Government fee	The Revenue Department publishes no fee for the certificate
Typical timing	In practice a few weeks from a complete file for individuals, longer if the officer asks for extra evidence; add 7 to 10 business days if you need your entry and exit record from the Immigration Bureau

2. What the certificate is, and what it is not

The certificate does one thing: it tells a foreign party that Thailand considers you, or your company, a tax resident for a specific year, so the double tax agreement between Thailand and that country applies. Thailand has double tax agreements with more than 60 countries. Under most of them, the country where income arises keeps the right to tax it, but at a reduced rate, or gives up the right entirely, if the recipient is resident in the other country. The certificate is the standard evidence of that residence.

It is often confused with three other documents:

Certificate of status of taxable person. Also issued by the Revenue Department, it confirms that a person or company is registered under a tax ID number. It says nothing about residence or a treaty, so a foreign payer asking for a treaty residence certificate will not accept it.
Tax ID card or TIN. Proof that you are registered with the Revenue Department, and a required supporting document, but not proof of residence.
Bank self-certification under the Common Reporting Standard. Banks ask you to declare your tax residence for automatic exchange of information. That is your own declaration, not a government certificate. See our guide to Thailand and the Common Reporting Standard.

3. When you need one

The request almost always comes from outside Thailand. The most common situations we see:

Reducing foreign withholding tax. A foreign company paying dividends, interest, royalties or service fees to a Thai resident wants evidence before applying the treaty rate instead of its domestic rate. Some countries make the certificate a legal condition for treaty relief; India is a well-known example.
Claiming a refund of foreign tax already withheld. Foreign tax authorities usually require the certificate with their own refund form.
Leaving your home country's tax net. An individual who moved to Thailand may be asked by the former home country to prove residence elsewhere, especially where the treaty's tie-breaker rules decide which country taxes pensions, rental income or capital gains.
Pensions and investment platforms. Pension funds and brokers may ask for it before paying at a treaty rate or changing your tax status.
Thai companies with foreign customers. A Thai company invoicing a client in a treaty country may need the certificate so the client can withhold at the treaty rate or not at all.

Before applying, ask the foreign party exactly what it needs: the tax year, whether it has its own form for the Thai authority to stamp, and whether it needs the original, a certified copy or a legalised copy. That saves a second application.

4. Who qualifies

Individuals

Under section 41 of the Revenue Code, an individual who stays in Thailand for 180 days or more in total in a calendar year is a Thai tax resident for that year. The days do not need to be consecutive, and the visa type does not matter. The Revenue Department's guidance for this certificate refers to residence of more than 180 days, so in practice keep a margin and expect the officer to count the days from your passport and entry and exit records.

The second condition is the one that surprises most applicants: the certificate refers to a year for which you have already filed a Thai personal income tax return. Its standard wording states that you are resident in the taxable year and have filed the return for that year. If you have not filed, the Revenue Department will not issue it. The return is PND 91 if your only income is employment income, and PND 90 otherwise, for example foreign income brought into Thailand, rental income or dividends. Our sister firm Plizz explains the filing rules in its guide to personal income tax for foreigners in Thailand.

Companies

A company incorporated in Thailand is a Thai tax resident and is taxed on its worldwide income. It can apply for the certificate with its tax ID card and DBD registration documents. The Revenue Department's published list does not add a filing condition for companies, but in practice the officer checks that the company is registered and up to date with its returns, so make sure the corporate income tax returns (PND 50 and PND 51) and, where relevant, the monthly VAT returns are filed before applying.

A branch or representative office of a foreign company is not a Thai resident company. It cannot obtain the certificate for its foreign head office, which must ask its own tax authority.

5. Documents the Revenue Department asks for

The published lists are short. In practice, especially for individuals with foreign income, officers often ask for more, and the requirement can change after the file is opened. Plan for the full set below.

Document	Individual	Company
Application or request letter, naming the tax year and the treaty country	Yes	Yes
Copy of the filed tax return (PND 90 or PND 91) and the tax payment receipt for that year	Yes	Corporate returns usually checked
Copy of the tax ID card	Yes	Yes
Passport: bio data page, visa pages and every entry and exit stamp for the year, signed	Yes	Director's passport if a foreigner signs
Official entry and exit record from the Immigration Bureau	Often requested	No
Withholding tax certificates from your employer (50 Tawi) and evidence of allowances claimed	Often requested	No
Bank statements for the year, dividend vouchers or other income evidence	Sometimes requested	Sometimes requested
DBD certificate of incorporation and company affidavit, with name, address and business in English	Letter confirming your directorship, if you are a director	Yes
Authorisation letter or power of attorney, with copies of the ID of both parties	If an agent applies	If an agent applies
The foreign authority's own form, if it has one	If required	If required

Documents prepared for the officer are usually signed on every page in blue ink. If you sign a power of attorney, check its date: an authorisation that expires before the file is submitted has to be signed again.

6. Step by step: individuals

Confirm the 180 days. Count your days in Thailand for the calendar year from your passport stamps. If your passport was renewed during the year, keep the old one.
File the tax return for that year. The PND 90 or PND 91 is due by 31 March of the following year (the Revenue Department usually allows a few extra days for online filing). Pay any tax due and keep the receipt. Without a filed return there is no certificate.
Ask the foreign party what it needs. Tax year, treaty country, its own form if any, original or legalised copy.
Request your entry and exit record. If the officer wants official evidence of your days, apply to the Immigration Bureau at the Government Complex on Chaeng Watthana Road in Bangkok with your passport. In our experience the record arrives in about 7 to 10 business days, and it can be collected or sent by post. Do this early, because it is often the longest step.
Prepare the file. Request letter, return and receipt, tax ID, passport copies, income evidence and, if an agent files for you, the signed authorisation.
Submit to the Revenue Department. Applications are made in person at the Area Revenue Office for your registered address, or by an authorised agent. The officer reviews the file and may ask for more documents.
Collect the certificate. It is issued in English. If the foreign party wants it legalised, take it to the Department of Consular Affairs of the Ministry of Foreign Affairs and, if required, to the embassy of the country concerned.

7. Step by step: companies

Check that the company's filings are up to date: PND 50, PND 51, monthly VAT returns if registered, and the annual financial statements filed with the DBD.
Obtain a recent DBD company affidavit and the certificate of incorporation, and prepare the company name, address and business description in English exactly as the foreign party will see them.
Prepare a request letter signed by an authorised director, naming the tax year, the treaty country and, if useful, the type of income concerned.
Submit to the Area Revenue Office responsible for the company, directly or through an agent with an authorisation letter and copies of the director's ID.
Collect and, if needed, legalise the certificate, then send it with the foreign payer's own form.

Companies receiving regular payments from the same country usually need a fresh certificate every year. Put it in the compliance calendar right after the annual corporate return is filed.

8. Timing and costs

Step	When or how long	Government cost
Personal income tax return for the year	By 31 March of the following year	Tax due, if any
Entry and exit record, Immigration Bureau	About 7 to 10 business days in our experience	Postage, if you ask for delivery by EMS
Revenue Department review and issue	Typically a few weeks from a complete file; longer if more evidence is asked for	No published fee
Legalisation, if the foreign party asks	A few working days at the Ministry of Foreign Affairs, plus embassy time	Ministry and embassy fees

The practical consequence: a certificate for tax year 2026 cannot be issued before the 2026 return is filed, so for most individuals the earliest realistic date is the first quarter of 2027. If a foreign payer needs something sooner, ask whether it will accept the certificate for 2025 while the 2026 one is being prepared.

9. The 2024 remittance rule and why it matters here

Since 1 January 2024, under Revenue Department Instruction Por. 161/2566, foreign income earned from 2024 onwards by a Thai tax resident is taxable in Thailand when it is brought into the country, whatever the year it is brought in. Many foreigners who had never filed in Thailand now do, and some find their home country also taxes the same income. The double tax agreement decides which country has the first right to tax and how the other gives a credit, and the certificate is the document that proves to the other country that the agreement applies to you.

Two points follow. First, filing the Thai return is not optional if you want the certificate. Second, the year matters: the certificate covers one tax year, so a person who became resident part way through their move may be resident in Thailand for one year and in the home country for the next.

10. Common mistakes

Applying before filing the return. The officer will not issue a certificate for a year with no filed return.
Counting days loosely. Long trips abroad can bring the total under 180 days. Count from the stamps, not from memory.
Losing an old passport. If the passport was renewed during the year, the old stamps are still needed.
Waiting too long for the Immigration record. Request it as soon as you know the officer will need it.
Letting the power of attorney expire. A dated authorisation that lapses before submission must be signed again, which costs weeks.
Asking for the wrong document. A certificate of status of taxable person or a tax ID card will not satisfy a foreign payer applying a treaty rate.
Forgetting the foreign form. Some countries require their own form, stamped by the Thai Revenue Department, in addition to the certificate.

11. FAQ

How do I get a certificate of residence in Thailand?

File your Thai personal income tax return for the year and pay any tax, then apply to the Area Revenue Office for your address with your return and receipt, tax ID, passport with entry and exit stamps and a request naming the tax year and treaty country. An agent can apply with an authorisation letter.

Can I get a certificate without filing a Thai tax return?

Not as an individual. The certificate states that you have filed the return for that taxable year, so the return comes first. If you have unfiled years, file them, pay any surcharge, and then apply.

Do I qualify with less than 180 days in Thailand?

No. Below 180 days in the calendar year you are not a Thai tax resident for that year, and the Revenue Department will not certify residence. You may be resident in another country instead.

How long does the certificate take?

Typically a few weeks once the file is complete. Add about 7 to 10 business days if the officer asks for your official entry and exit record from the Immigration Bureau, and more if additional income evidence is requested.

Is the certificate valid for several years or countries?

No. Each certificate names one taxable year and one treaty country. A foreign payer that pays you every year will usually ask for a new certificate each year.

Can a foreign company's Thai branch get one?

No. A branch or representative office is part of a foreign company that is resident abroad. Only companies incorporated in Thailand, and individuals who are Thai tax residents, can obtain a Thai certificate of residence.

12. How we can help

Our tax team prepares and files the application for individuals and companies: we check the days and the filed returns, ask the foreign party what it needs, prepare the request letter and the authorisation, request the Immigration record, deal with the Revenue Department officer's questions and arrange legalisation where it is needed. The application itself is quoted in writing once we have seen the year and the documents. If the return for the year is not filed yet, we can file it first: an annual personal tax filing (PND 90 or 91) for a foreigner is THB 10,000, excluding 7% VAT. For a question on residence or treaty relief, a tax consultation starts from THB 5,000 per hour, excluding VAT; see our tax law practice. Send us the tax year, the country asking and what it asked for through our contact page, or book an online consultation.

Certificate of Residence in Thailand (RO.22): How to Get a Tax Residence Certificate (2026)