A double tax treaty (DTA, in Vietnamese hiệp định tránh đánh thuế hai lần) is an agreement between Vietnam and another jurisdiction that divides the right to tax income between them. Vietnam has concluded treaties with a wide range of jurisdictions, including most of its major investment partners. Where a treaty applies and its conditions are met, it can reduce or remove Vietnamese tax on income that a resident of the other jurisdiction earns from Vietnam, and it obliges the country of residence to relieve double taxation on income taxed in Vietnam.
Two limits are worth fixing in mind from the start. A treaty never creates a tax that Vietnamese domestic law does not impose; it only restricts it. And in Vietnam a treaty benefit is not automatic: the person claiming it, or the Vietnamese payer, has to show residence and follow a notification procedure. This guide explains how the two layers — domestic law and treaty — fit together, and how to read a treaty as a finance team rather than as a lawyer.
Two layers, read side by side
Vietnamese domestic law decides whether income is taxable and how much tax arises: the Corporate Income Tax Law (Law 67/2025/QH15) for companies, the personal income tax rules for individuals, and the Law on Tax Administration (Law 38/2019/QH14) for procedures, now with its 2026 guidance — Decree 252/2026/NĐ-CP and Circular 89/2026/TT-BTC. A treaty then asks a second question: given that Vietnam would tax this income, does the treaty allow it to, and up to what limit?
Where a treaty to which Vietnam is party provides differently from domestic law, the treaty applies. But the treaty works only as a ceiling. If domestic law already imposes no tax, or less tax than the treaty allows, the treaty adds nothing. That is why the first step is always to work out the Vietnamese domestic position, and only then to check the treaty.
Domestic law changed substantially in 2025 and 2026 while treaties stayed the same. Our sister site NganhThue keeps a Vietnamese-language section on international tax treaties, including how to read the two layers together after the recent changes.
Which taxes and which persons are covered
Vietnam's treaties cover taxes on income: in Vietnam, corporate income tax and personal income tax. They do not cover value added tax, import duties, excise tax or fees. This has a practical consequence for foreign contractor tax: a treaty can reduce or remove the CIT component (or the personal income tax on an individual), but the VAT component is unaffected.
A treaty protects residents of one or both contracting jurisdictions. Residence is defined in each treaty, usually by reference to liability to tax in that jurisdiction by reason of domicile, residence, place of management or a similar criterion. Citizenship alone is not the test, and neither is the place of incorporation of a parent company further up the chain. For a company, the relevant resident is the entity that actually earns the income — which is why beneficial ownership matters for dividends, interest and royalties.
The articles a foreign investor reads first
| Article (typical title) | What it decides | Where it matters in Vietnam |
|---|---|---|
| Residence | Who is entitled to the treaty; tie-breakers for dual residents | Every claim, and expatriates resident in two countries |
| Permanent establishment | When a foreign company has a taxable presence | Project sites, service teams, dependent agents |
| Business profits | Profits taxable only in the residence state unless there is a permanent establishment | Service fees and the CIT component of foreign contractor tax |
| Dividends, interest, royalties | Maximum rate the source state may apply | Payments by Vietnamese companies to foreign lenders and licensors |
| Capital gains | Which state may tax gains on shares and property | Sales of shares in Vietnamese companies |
| Employment income | When the source state may tax salaries | Short-term assignees working in Vietnam |
| Elimination of double taxation | How the residence state gives relief | Vietnamese companies earning income abroad |
| Mutual agreement procedure | How disputes between the two tax authorities are resolved | Transfer pricing and double taxation disputes |
The articles follow common international models, but the details — rates, thresholds, day counts, definitions and exceptions — vary from treaty to treaty. We deliberately do not quote rates or thresholds here. Always read the specific treaty, in its authentic text, for the jurisdiction concerned.
Where treaties change the answer for a foreign-invested company
In day-to-day practice, a treaty tends to matter in five situations:
- Payments abroad under foreign contractor tax. Service fees, royalties and interest paid to a treaty resident may carry a lower CIT component, or none for business profits without a permanent establishment — provided the notification procedure is followed.
- Project teams in Vietnam. Whether a foreign company's site or service team creates a permanent establishment is decided by the treaty's definition as well as domestic law, and that decides whether profits are taxed in Vietnam on a net basis.
- Sale of shares in a Vietnamese company. The capital gains article decides whether Vietnam may tax a foreign seller's gain. Many treaties preserve Vietnam's right in some cases, for example for companies whose value comes mainly from immovable property; read the specific article.
- Expatriate employees. The employment article and the residence tie-breaker decide where a short-term assignee's salary is taxed and how double taxation is relieved.
- Vietnamese companies expanding abroad. The elimination article decides how foreign tax paid is credited in Vietnam.
What a treaty cannot do
- It cannot be claimed informally. Vietnam requires a residence certificate and a notification or claim procedure. A supplier's statement that it is resident in a treaty country is not enough.
- It does not cover VAT. The VAT component of foreign contractor tax, and VAT generally, stays as domestic law sets it.
- It does not protect artificial arrangements. Treaty benefits can be denied where the claimant is not the beneficial owner of the income, or where the main purpose of an arrangement is to obtain the benefit. Vietnamese guidance has long applied this test.
- It does not change filing obligations. Even where a treaty removes tax, returns and notifications may still be required.
- It does not override a treaty's own dates. Each treaty applies from dates set in its text after it enters into force; a new or amended treaty does not reach back to earlier years unless it says so.
A worked way to approach a payment
Hypothetical example. Suppose a Vietnamese manufacturer pays a licence fee to a technology company resident in a jurisdiction that has a treaty with Vietnam. The finance team works in order:
- Establish the domestic position: the payment is a royalty subject to foreign contractor tax, with a VAT component that depends on what is licensed and a CIT component at the royalty percentage.
- Identify the treaty and the relevant article — here, royalties — and read its definition, its maximum rate and any conditions, such as beneficial ownership.
- Compare. If the treaty ceiling is lower than the domestic CIT component, the treaty may reduce it; if not, the treaty adds nothing on this point.
- Obtain a residence certificate for the right period and prepare the notification file before relying on the lower figure.
- Keep the VAT component unchanged, because the treaty does not cover VAT.
When the two tax authorities disagree
Treaties contain a mutual agreement procedure: a taxpayer who considers that the actions of one or both states result in taxation not in accordance with the treaty can present the case to the competent authority of its state of residence, within the time limit set in the treaty. The two authorities then try to resolve the case by agreement. The procedure is slow and does not guarantee a result, but it is the treaty's own route for problems such as the same profit being taxed in both countries after a transfer pricing adjustment.
Two practical points: the time limit runs from the first notification of the action giving rise to double taxation, so do not wait for a domestic appeal to finish before considering it; and keep the complete record of the Vietnamese assessment, because the foreign authority will ask for it.
Where to find the text and check your position
The Ministry of Finance and the tax authority publish the list of Vietnam's treaties with their status and texts. Read the treaty in one of its authentic languages — usually English is among them — and check the dates of entry into force and effect. Protocols amending a treaty are published separately and must be read with it.
For your own filings, the company's e-tax account shows foreign contractor tax returns and payments, including those where a treaty reduction was applied; confirm the notification file was lodged for each. The taxpayer information lookup shows the managing tax office, which is where treaty notifications are generally lodged — since 1 July 2025 one of the provincial or grassroots offices in the three-tier administration across 34 provinces and centrally run cities.
Frequently asked questions
Does a tax treaty apply automatically in Vietnam?
No. The claimant, or the Vietnamese payer, must show residence with a certificate and follow the notification procedure. Without it, domestic rates apply.
Can a treaty reduce the VAT component of foreign contractor tax?
No. Vietnam's treaties cover taxes on income, not VAT. A treaty can affect only the CIT component, or personal income tax for an individual.
If domestic law taxes less than the treaty allows, which applies?
Domestic law. A treaty only limits Vietnam's taxing right; it never increases tax. Work out the domestic position first.
Our parent is incorporated in one country but managed in another. Which treaty applies?
The treaty with the jurisdiction where the entity is resident under the treaty's residence article, which may turn on place of management. Get a residence certificate from that jurisdiction for the right period.
Where can we read the official text of a treaty?
The Ministry of Finance and the tax authority publish the list of treaties with their texts and status. Read the authentic text and any protocol, and check the dates from which it applies.
Do treaties stop Vietnam from challenging our structure?
No. Benefits can be denied where the claimant is not the beneficial owner of the income or the arrangement lacks commercial substance. Treaties protect genuine residents, not conduits.
