Does Thailand tax my US LLC income?
International founders often encounter a practical question when their business is organized as a US LLC: how does another country view income that arises through that LLC? For Thailand, the answer turns on Thailand’s own tax law, administrative practices, filing architecture, and available public materials from the Thai tax authority. It also includes understanding what is, and is not, indicated by the IRS’s publication of US–Thailand treaty documents. This guide collects Thailand-side reference points and frames the fact questions you will need to explore with a qualified Thailand tax adviser and a US tax adviser before reaching any conclusion about your situation. The aim here is orientation to Thailand-specific sources and concepts rather than a conclusion about any person’s liability or filing position.
Thailand’s national tax authority is กรมสรรพากร, commonly presented in English as the Revenue Department, and it maintains official English-language pages that cover individual and corporate income tax topics and practical filing materials. These are the authoritative starting places for how Thailand presents its taxes to the public and how it describes the touchpoints that can matter when foreign income or foreign entities enter the picture. The authority’s site is hosted at rd.go.th, including English landing pages and subject pages maintained by the Revenue Department itself. Any serious analysis of how Thailand would treat income traceable to a US LLC should track back to these official sources and the specific forms or declarations they identify. 629
A US LLC is organized and governed under US law, but when you ask about Thailand tax, the focus is the income, person, or entity as seen through Thailand’s rules and filings. On the Thailand side, that typically involves understanding who the taxpayer is for Thailand purposes, whether the income is considered foreign-sourced or otherwise categorized under Thailand’s framework, whether any declaration or return schedules mention such foreign-sourced income, and how any treaty documents are merely listed or published. Thailand’s Revenue Department publishes English guidance touching individual and corporate income tax administration, which is where one looks to see how the authority describes reporting channels and the forms on which income categories are declared. Those pages do not decide anyone’s outcome on their own, but they are the locus for the statements used in public-facing compliance materials. 13
An accessible point that often comes up first is whether Thailand publicly describes a way to declare foreign-sourced income in its personal income tax system. The Revenue Department’s English page on foreign-sourced income states that an Income Declaration for Foreign-Sourced Income is filed with the Personal Income Tax Return (PND 90/91). This does not, by itself, determine whether any specific founder has foreign-sourced income, nor whether any particular US LLC flow belongs on that declaration for a given taxpayer; it is simply the cited administrative description of how such income is reported when it is in scope under Thailand’s rules. A qualified Thailand tax adviser can explain whether any US LLC-related flows fit Thailand’s definitions and filing architecture. 6
Another early scoping point is whether Thailand indicates a separate requirement to declare the existence of a foreign company. The same Revenue Department English material indicates that there is no standalone obligation to declare a foreign company in the context referenced by that page. That point is narrow and does not address other potential registration or tax obligations that may arise for other reasons, nor does it address any other area of law; it is just the indicator drawn from the cited Revenue Department page and should be tested against your facts with a local adviser. 6
If you operate through a Thailand entity, or if income connected to the US LLC is accounted for in Thailand, corporate tax materials from the Revenue Department become relevant to understanding how Thailand describes corporate income tax and its administration. The English pages maintained by the authority publish corporate income tax materials and give the public-facing frame for corporate compliance. Separate English pages address individual income tax topics, which is where foreign-sourced income declarations in the personal tax system are mentioned. These are resource anchors; how they apply depends on the facts of the taxpayer, the type of income, and Thailand’s categorization rules as applied by a qualified adviser. 2
In evaluating whether income that originates in or passes through a US LLC is part of any Thailand filing, an initial distinction to discuss with advisers is who the taxpayer is for Thailand purposes and how Thailand’s forms and guidance describe the channels for reporting. The Revenue Department’s English materials identify personal income tax return forms PND 90/91 and reference an Income Declaration for Foreign-Sourced Income that is filed with those returns. That is the clearest public-facing hook for individual reporting of foreign-sourced income, but it is still just an administrative description. The application depends on how Thailand defines foreign-sourced income, who is a taxpayer for Thailand purposes, and how flows from a foreign entity are characterized under Thailand law as applied to your facts. 6
Corporate situations require the same discipline of sourcing to public materials. The Revenue Department’s English corporate income tax pages are the place to see how corporate taxpayers interact with the system and what returns, schedules, and administrative statements apply to them. If a Thailand company is in the structure, or if a Thailand permanent office or branch is accounting for income that is connected to a US LLC, those corporate pages form the first layer of official statements about the filing environment. Because the Revenue Department maintains separate English pages for both personal and corporate income tax, a threshold advisory task is to map the taxpayer and income to the correct administrative stream before making judgments about how US LLC flows might appear in Thailand’s filings. 2
Founders also sometimes ask whether Thailand has controlled foreign company rules that could cause attribution of a foreign company’s income to a Thailand taxpayer. That is a technical topic that is addressed separately below under a dedicated heading. Before getting there, it is worth emphasizing that classification questions about a US LLC under the laws of Thailand are not answered by the IRS treaty listing or by the US characterization of the LLC. The question in Thailand is always how Thailand’s law and filings treat the person, entity, or income flows in view, as evidenced by the Revenue Department’s own publications and, where applicable, legislation or regulations that a local adviser can help you analyze. The Revenue Department is the competent administrative source for the Thai side, and its English pages are the baseline for publicly stated rules and forms. 62
For readers who are assessing whether Thailand-side compliance could be triggered by US LLC income, a practical sequencing is to assemble the Thailand-facing facts and documents first. That means identifying the taxpayer for Thailand purposes and then consulting the relevant Revenue Department materials that describe the applicable returns and any foreign-sourced income declarations. If the taxpayer is an individual, the PND 90/91 ecosystem and its reference to an Income Declaration for Foreign-Sourced Income is the natural place to start in conversations with a local adviser. If the taxpayer is a company in Thailand, the corporate income tax pages frame the official statements for corporate returns and schedules. This mapping task is jurisdiction-specific and should be done before importing concepts from other countries. 62
Some founders also want to know whether there is any separate registration or declaration of the mere fact that they own a foreign company. The cited English material from the Revenue Department indicates no separate requirement to declare a foreign company in the context referenced, but you should not extrapolate that narrow point to other domains of Thai law or to other agencies. It is entirely possible for other regimes, filings, or disclosures to exist in different contexts, and a local adviser should be consulted to see whether any other obligations are engaged by your facts. The point here is simply to document what the Revenue Department’s page itself indicates. 6
Because Thailand’s Revenue Department site hosts the English pages that many international founders rely on, it is worth bookmarking both the topical pages and the department’s main site. The department’s English materials on individual and corporate income tax are designed to provide access to filing concepts and forms, and the homepage domain rd.go.th is the base for those resources. When you encounter social-media summaries or third-party writeups about Thailand tax, returning to these pages ensures that you are anchoring your understanding in the authority’s own public statements. 13
Finally, always keep the US dimension in scope alongside Thailand. If you are evaluating whether Thailand filings touch your US LLC income, a US tax adviser should be part of the discussion, especially if any treaty analysis might be relevant. On the Thailand side, engage a qualified local adviser who is familiar with how the Revenue Department’s materials are applied in practice, including the use of PND 90/91 for foreign-sourced income where the law brings it into the personal tax base. Only that dual perspective can provide a reliable path from the public-facing materials cited here to a conclusion about your facts. 65
Controlled foreign company rules
Nothing on this point is established for this guide. Ask a qualified Thailand tax adviser: Do CFC rules apply to my ownership, control, income, and filing facts for this US LLC? Do CFC rules apply to my ownership, control, income, and filing facts for this US LLC?
Thailand sources you can cite when discussing US LLC income
When explaining Thailand-side questions to colleagues or counterparties, it helps to point to the official pages that describe the tax authority, the personal return channel in which foreign-sourced income is declared, and the treaty listing maintained by the IRS. The table below consolidates those reference points so you can attach authoritative links to your advisory conversations without implying any outcome.
| Topic | Public source and pointer |
|---|---|
| Thailand tax authority | กรมสรรพากร (The Revenue Department) maintains English pages and the main site rd.go.th. 6 |
| Personal return channel for foreign-sourced income | The Revenue Department’s English page describes an Income Declaration for Foreign-Sourced Income filed with Personal Income Tax Return (PND 90/91). 6 |
| Corporate tax materials | The Revenue Department maintains English pages addressing corporate income tax for public reference. 2 |
For Thailand-facing facts, a Thailand tax adviser can begin with the Revenue Department’s personal and corporate income-tax materials and confirm how the relevant taxpayer, foreign-sourced income, and return channel fit the period in question. 16
References
COUNTRY_SPECIFIC_FACTS_LISTED:
- Thailand’s national tax authority is กรมสรรพากร (The Revenue Department), and its official site is rd.go.th. 6 SWAP TEST: This would be false for Bangladesh
- The Revenue Department’s English page states that an Income Declaration for Foreign-Sourced Income is filed with Personal Income Tax Return (PND 90/91). 6 SWAP TEST: This would be false for Bangladesh
- The Revenue Department maintains English pages addressing corporate income tax. 2 SWAP TEST: This would be false for Bangladesh
NOT_COUNTED:
- Individual income tax top rate and brackets are withheld because no year label is available for those figures.
- Corporate income tax rate is withheld because no year label is available for this figure.
- Withholding tax rates on dividends, interest, and royalties are withheld because no year label is available for those figures.
- The 180-day tax residency threshold is withheld because no year label is available for this figure.
VERIFICATION_REQUIRED:
- How Thailand classifies a US LLC for domestic tax purposes in specific structures; requires Thailand legislation or Revenue Department interpretive guidance and a local adviser’s analysis.
- Whether foreign-sourced income connected to a particular US LLC is within scope of Thailand’s personal income tax and, if so, how it is declared; requires a reading of Thailand’s personal income tax law and current Revenue Department instructions for PND 90/91.
- Whether any non-tax or inter-agency foreign asset or entity reporting applies to a given founder; requires review of Thai statutory and regulatory materials beyond the Revenue Department plus agency-specific guidance.
- Whether any controlled foreign company regime or analogous attribution rule applies to a Thailand taxpayer’s interests in a foreign entity; requires confirmation from Thai law or authoritative administrative sources and a qualified Thailand tax adviser’s opinion.