Your Vietnamese company is about to pay loan interest to a foreign bank, software royalties to an overseas partner, or service fees to a foreign contractor. Before the money moves, accounting must withhold tax at source (foreign contractor tax) and remit it to the budget. The question: if the recipient's country has a double tax avoidance agreement (DTA) with Vietnam, can the company withhold less?
The answer is yes — but the relief is not automatic. A treaty only works when the enterprise proves eligibility and files the correct dossier under current procedures. Notably, Vietnam's DTA legal framework changed significantly on 1 July 2026: Circular 95/2026/TT-BTC replaced Circular 205/2013/TT-BTC, and filing procedures moved to Circular 89/2026/TT-BTC. Much of the guidance circulating online still cites instruments that are no longer in force.
This article provides a 13-step checklist for applying DTAs to reduce withholding tax, updated for the legal framework as of 27 September 2026.
1. Three foundational principles before you start
Understand these three principles before walking through the steps. Misunderstanding any one of them causes most failed DTA applications.
Principle 1: A treaty limits Vietnam's taxing rights — it never creates a new tax liability. In other words, a DTA can only reduce or eliminate tax that Vietnamese law already imposes — never add tax. Example: dividends a Vietnamese company pays to a foreign institutional shareholder currently carry no withholding tax under Vietnamese law. Even if a treaty permits Vietnam to tax dividends up to 10%, the company does not withhold extra just because "the treaty allows it". No domestic tax means nothing to reduce.
Principle 2: Treaties cover taxes on income and capital only — not value-added tax. This is the most common confusion. When paying service fees to a foreign contractor, the VAT portion of contractor tax (5% for ordinary services) must still be withheld and paid in full; the treaty can only affect the corporate income tax portion. Similarly, loan interest and royalties paid to foreign organizations are exempt from VAT under current rules, so the portion the treaty affects is the CIT contractor tax.
Principle 3: Where domestic law and a treaty both cover the same income, the provision more favorable to the taxpayer applies. The treaty sets a "cap" on what Vietnam may collect. If the domestic rate is already below that cap, the company simply applies the domestic rate without invoking the treaty. Only when the treaty's cap is lower than the domestic rate does filing a DTA application actually reduce the withholding.
2. The 13-step DTA checklist for reducing withholding tax
- [ ] Step 1 — Confirm the recipient's country has an effective treaty with Vietnam. As of early 2026, Vietnam had signed 81 double tax avoidance agreements (the newest, with the Republic of Cyprus, signed 15 December 2025). Not every signed treaty is in force — check the in-force status of each specific treaty before applying it. Without an effective treaty, this entire checklist does not apply, and the company withholds at domestic rates.
- [ ] Step 2 — Confirm the income recipient is a "resident" of a contracting state. Only residents of one of the two contracting states enjoy treaty benefits (Article 4 of the treaties). A company registered in a third country — even the parent of the payee — cannot invoke the treaty between Vietnam and the subsidiary's country to claim a reduction. This is a threshold condition; verify it before preparing any other documents.
- [ ] Step 3 — Verify the "beneficial owner" condition. Treaties require the recipient of dividends, interest, and royalties to be the true beneficial owner of that income. If the money merely passes through an intermediary (conduit) company in a treaty country while the real owner sits in a third country, the tax authority may deny the treaty benefit. For multi-tier payment structures, this step needs careful lawyer review — interpretation of this condition depends on the tax authority's position in each specific file.
- [ ] Step 4 — Classify the income correctly and cite the right treaty article. Each income type has its own article with its own cap: Article 10 (dividends), Article 11 (interest), Article 12 (royalties), Article 7 (business profits — covering service fees and business income generally), Article 13 (capital gains). Misclassification — mistaking technical service fees for royalties, for example — leads to the wrong article and the wrong rate. Where the boundary is unclear, rely on the economic substance of the transaction in the contract, not merely the label the parties chose.
- [ ] Step 5 — Check for a permanent establishment (PE). This is a "switch" that can wipe out the entire rate-cap benefit. Under the dividend, interest, and royalty articles of the treaties, if the income is connected to a permanent establishment the foreign party has in Vietnam (an office, branch, prolonged construction project…), that income is taxed under Article 7 as PE profits — the 10% cap no longer applies. The company must review the foreign partner's actual presence in Vietnam before concluding a reduction is available.
- [ ] Step 6 — Compare the domestic rate with the treaty cap. Look up the domestic contractor CIT rate under current law (Clause 3, Article 12 of Decree 320/2025/ND-CP: services 5%, royalties 10%, loan interest 5%, capital transfers 2%) and place it beside the cap in the relevant treaty (see the comparison table in section 3). Only when the treaty's cap is lower than the domestic rate does a DTA application deliver real tax savings. If the domestic rate is already equal to or lower, apply the domestic rate — but keep records of the comparison to explain if the tax authority asks.
- [ ] Step 7 — Prepare the Certificate of Residence and consular legalization. This is the most important document — and where most files are rejected. The Certificate of Residence must be issued by the tax authority of the residence country, state clearly the tax year in which the recipient is a resident, and be consular-legalized for use in Vietnam. Timing note: at filing, if the certificate for the exact year of the relief claim is not yet available, the company may submit the certificate for the year immediately before the notification year — but must later supplement the certificate for the correct tax year (see step 12). Foreign-language documents must be translated into Vietnamese and certified as required.
- [ ] Step 8 — Draft the treaty application on Form 01/HTQT. The current application form is Form 01/HTQT issued with Appendix III of Circular 89/2026/TT-BTC (no longer the Appendix I form of Circular 80/2021). Where the taxpayer cannot provide all required information or documents, it must explain specifically within this Form 01/HTQT. Complete it fully and accurately: the income recipient, income type, treaty article cited, and the rate requested.
- [ ] Step 9 — Prepare the contract and supporting papers for each income type. The basic dossier includes a copy of the contract (paper or electronic) signed with the organization or individual in Vietnam, certified by the taxpayer. Some cases need specific papers: capital gains income additionally requires a copy of the capital transfer contract and the investment certificate of the Vietnamese company the foreign investor contributed capital to; interest income of a foreign government body exempt under a treaty requires a copy of the loan agreement; securities trades without a contract require a transaction data statement or transaction confirmation certified by the custodian bank or securities company on Form 01/TNKDCK. For foreign suppliers with many small transactions, the tax authority may consider allowing a model contract with a list of service users — but this is the authority's discretion, not an automatic right.
- [ ] Step 10 — File at the right time and with the right tax authority. Under Article 78 of Circular 89/2026/TT-BTC, the foreign contractor — or the Vietnamese party signing the contract or paying the income — submits the treaty relief dossier together with the tax return of the first filing — to the tax authority directly managing the Vietnamese party or the authority where the foreign contractor is registered to pay tax. Important: the "within 15 days before the filing deadline" rule of Circular 80/2021 ceased to be effective on 1 July 2026; many old online materials still show the 15-day mark, and following it would mean filing at the wrong time.
- [ ] Step 11 — The Vietnamese party withholds at the reduced rate. Once the dossier is accepted, the Vietnamese party withholds at the treaty rate (or 0% where an exemption applies) instead of the domestic rate, and declares and pays the withheld tax as required. Reminder: the contractor VAT portion (if any — e.g., 5% on service fees) is outside the treaty's scope and must still be withheld in full.
- [ ] Step 12 — At year-end, supplement the Certificate of Residence for the correct tax year; in later years, submit only new contracts. If at filing only the prior-year certificate was available, the company must supplement the certificate for the correct tax year once obtained. Where a treaty relief dossier was already filed in a prior year, subsequent years require only certified copies of newly signed contracts (if any) — not a full new dossier from scratch.
- [ ] Step 13 — Archive the dossier and monitor treaty validity and information changes. Keep the full treaty application dossier for production during tax inspections. Also monitor: whether the relevant treaty remains in force or has been replaced/amended; whether the income recipient remains a resident of the contracting state; any changes in the beneficial ownership structure or the emergence of a PE in Vietnam. Any change may end eligibility for subsequent payments.
3. Quick comparison: domestic rates vs caps under selected treaties
The table below places side by side the domestic contractor CIT rates under current law (Decree 320/2025/ND-CP, Circular 20/2026/TT-BTC, Circular 69/2025/TT-BTC) and the caps under Vietnam's treaties with selected high-transaction countries. The caps in the table are the maximum Vietnam may collect under each treaty — enterprises must consult the original treaty text for the exact figure on their transaction, as some treaties differentiate caps across finer income sub-groups.
| Income paid to a foreign partner | Domestic contractor CIT rate | Caps under selected Vietnam treaties |
|---|---|---|
| Loan interest | 5% (VAT-exempt) | China 10%; Singapore 10%; Korea 10%; UK 10% |
| Royalties | 10% (VAT-exempt) | China 10%; Singapore 5%–10% by sub-group; Korea 5%–15% by sub-group; UK 10% |
| Service fees (contractor with no PE in Vietnam) | 5% CIT + 5% VAT | 0% CIT under Article 7 of the treaty (VAT still applies as it is outside the treaty's scope) |
Three practical conclusions from the table:
First, for loan interest, the domestic 5% rate is currently below the 10% cap of most treaties — so the company simply withholds 5% under domestic law without a treaty filing, except where the loan is fully exempt (e.g., a loan from a foreign government body exempt under the interest article of the treaty).
Second, for royalties, the treaty can genuinely reduce tax: the domestic 10% rate may drop to 5% if the relevant treaty caps that royalty sub-group at 5% (as in some royalty sub-groups under the Singapore or Korea treaties).
Third, for service fees, the treaty's benefit is the largest: where the foreign contractor has no PE in Vietnam, the 5% CIT is eliminated to 0% under Article 7 — the company withholds only the 5% VAT.
On dividends separately: dividends a Vietnamese company pays to foreign institutional shareholders currently carry no withholding tax under Vietnamese law, so the treaty creates no additional obligation (per Principle 1 in section 1).
4. Seven common traps that kill DTA applications
Trap 1 — Citing expired instruments. Since 1 July 2026, Circular 205/2013/TT-BTC has been replaced by Circular 95/2026/TT-BTC; Circular 80/2021/TT-BTC has been replaced by Circular 89/2026/TT-BTC; Circular 103/2014/TT-BTC on contractor tax has been abolished. Much online guidance, forms, and accounting software still cite the old instruments. A dossier citing the wrong instrument in force is a formal defect the tax authority may return at the intake stage.
Trap 2 — Using the outdated "15-day advance notice" deadline. The rule of filing within 15 days before the filing deadline belonged to Circular 80/2021, now expired. The current rule (Article 78, Circular 89/2026/TT-BTC) is filing together with the first filing's tax return. Following the old 15-day mark can mean filing at the wrong time.
Trap 3 — Certificate of Residence missing consular legalization or covering the wrong tax year. The most common real-world error: the certificate issued by the foreign tax authority is not consular-legalized for use in Vietnam, or covers a tax year that does not match the relief-claim year. The tax authority will not accept a dossier missing this document.
Trap 4 — Forgetting to check the partner's permanent establishment in Vietnam. The company looks only at the payee's nationality and misses whether the partner has an office, branch, or prolonged project in Vietnam. Where income is connected to a PE, the rate-cap benefits under Articles 10, 11, and 12 of the treaty no longer apply at all.
Trap 5 — Expecting the treaty to reduce VAT too. Double tax treaties cover taxes on income and capital only. The contractor VAT portion (e.g., 5% on service fees) is outside the treaty's scope and must still be withheld in full. Net cash-flow calculations that skip this point will under-budget the tax payable.
Trap 6 — Misunderstanding that a treaty could "add" tax. Some enterprises fear that invoking a treaty exposes them to higher tax — e.g., seeing the treaty permit Vietnam to tax dividends up to 10% and fearing they must withhold 10% on outbound dividends. The opposite is true: a treaty never creates a new tax liability; with no domestic tax, there is nothing extra to withhold.
Trap 7 — Skipping the "beneficial owner" check on intermediary payment structures. Where cash flows through a shell company in a low-cap treaty country, tax authorities increasingly scrutinize the transaction's substance and may deny the benefit if the payee is not the true beneficial owner. Conduit structures need legal review before the dossier is built, not after an inspection begins.
5. Worked example: paying loan interest and royalties to a Chinese partner
Company V in Vietnam borrows from a bank in China and pays USD 1 million in interest per year; V also pays USD 500,000 per year in software royalties to a technology company in China. The Vietnam–China DTA (signed 17 May 1995, effective 18 October 1996) caps both interest and royalties at 10%.
Applying the checklist:
- For loan interest: the domestic rate is 5% CIT (VAT-exempt), below the treaty's 10% cap — V withholds 5% under domestic law without invoking the treaty. However, if this is a loan from a Chinese government body exempt under the treaty's interest article, V must complete the full DTA dossier (with a copy of the loan agreement) to obtain the exemption.
- For royalties: the domestic 10% rate equals the treaty's 10% cap — no numerical reduction, but a complete DTA dossier locks in the 10% and prevents disputes over income classification at finalization.
- If the Chinese partner were replaced by a Singaporean partner and the royalties fell in a sub-group capped at 5% under the Vietnam–Singapore treaty, V would reduce withholding from 10% to 5% — a case where the DTA dossier delivers direct cash benefit.
For Vietnam–China transactions generally, our in-depth article "Vietnam–China DTA: Practical Application" (planned) analyzes each clause and scenario of that treaty in detail.
6. When to work with a lawyer
A DTA application looks like mere paperwork, but every checklist step hides a legal question: how to classify the income correctly, whether the partner has a PE in Vietnam, whether the payment structure survives a "beneficial owner" test, and whether the relevant treaty is still in force. Enterprises should work with a lawyer when: signing contracts with large outbound payment flows; dealing with multi-tier structures across several countries; facing tax authority questions on a filed DTA dossier; or being taxed inconsistently with the treaty and considering the mutual agreement procedure (MAP) under Circular 95/2026/TT-BTC.
FLAT LAW FIRM advises comprehensively on international tax and double tax treaties for FDI enterprises: reviewing DTA eligibility, preparing treaty relief dossiers, and representing clients before tax authorities during inspections. Contact our hotline 0988424851 for advice on your company's specific situation.
7. Frequently Asked Questions
Does a DTA automatically reduce withholding tax?
Short answer: no. Treaty benefits are not automatic — the enterprise must prove eligibility and file the correct dossier under current procedures.
Explanation: three foundational principles govern every file. First, a treaty only limits Vietnam's taxing rights; it never creates a new tax obligation — no domestic tax means nothing to reduce. Second, treaties cover only taxes on income and capital, not VAT. Third, where domestic law and the treaty both cover an income item, the rule more favorable to the taxpayer applies.
Legal basis: Circular 95/2026/TT-BTC (replacing Circular 205/2013/TT-BTC) and Circular 89/2026/TT-BTC (replacing Circular 80/2021/TT-BTC) — the DTA framework in force from 1 July 2026.
Next step: walk through the 13-step checklist in section 2, starting by confirming the treaty with the payee's country is in force.
Can a treaty reduce contractor VAT?
Short answer: no. VAT sits outside the scope of every double tax treaty.
Explanation: when paying service fees to a foreign contractor, the contractor VAT portion (5% for ordinary services) must still be withheld and paid in full; the treaty can only affect the CIT portion. Note that foreign loan interest and royalties paid to foreign organizations are VAT-exempt under current rules, so the treaty-affected portion is the contractor CIT.
Legal basis: principle 2 in section 1; Circular 69/2025/TT-BTC guiding VAT.
Next step: when modeling DTA benefits, strip the VAT out of the comparison — compare only the CIT portion.
What must a Certificate of Residence satisfy?
Short answer: issued by the tax authority of the residence country, stating the tax year of residence, legalized for use in Vietnam and translated into certified Vietnamese.
Explanation: this is the single most important document — and where most dossiers fail. The certificate must state clearly which tax year the payee was resident. If the certificate for the exact relief year is not yet available at filing, the prior year's certificate may be submitted — but the correct year's certificate must follow. Foreign-language documents must be translated into Vietnamese and certified.
Legal basis: step 7 of the checklist; Article 78, Circular 89/2026/TT-BTC.
Next step: contact the residence country's tax authority early — issuance plus consular legalization often takes weeks; do not start just before the filing deadline.
When and where is the DTA dossier filed?
Short answer: together with the tax return of the first filing period — with the tax authority directly managing the Vietnamese party, or where the foreign contractor is registered.
Explanation: the "15 days before the filing deadline" rule belonged to Circular 80/2021, which expired on 1 July 2026. Much outdated guidance online still cites the 15-day mark and will cause mistimed filings. The current request form is Form 01/HTQT issued with Appendix III of Circular 89/2026/TT-BTC.
Legal basis: Article 78, Circular 89/2026/TT-BTC.
Next step: cross-check step 10 of the checklist; verify every form in use is the current version.
When does an enterprise not need a DTA dossier to get the lower rate?
Short answer: when the domestic rate is already equal to or lower than the treaty cap — then simply apply the domestic rate.
Explanation: for loan interest, the 5% domestic rate sits below the 10% treaty cap in most treaties, so the enterprise withholds 5% under domestic law without invoking any treaty. Dividends paid to foreign organizations currently bear no Vietnamese withholding tax, so no treaty can create an additional obligation. A DTA dossier only delivers real cash benefit when the treaty cap is below the domestic rate — e.g., royalties under the Vietnam–Singapore treaty can drop from 10% to 5%.
Legal basis: principles 1 and 3 in section 1; the comparison table in section 3.
Next step: build a domestic-rate vs treaty-cap comparison for each income type before deciding whether to file; even without filing, keep the comparison on record for tax authority queries.
Do payments routed through an intermediary company qualify for DTA benefits?
Short answer: uncertain — the tax authority may deny the benefit if the payee is not the true beneficial owner.
Explanation: treaties require the recipient of dividends, interest and royalties to be the beneficial owner of the income. Where money merely passes through a conduit company in a treaty country while the real owner sits in a third country, the benefit can be refused. How this condition is interpreted — including the principal purpose test for intermediary structures — depends on the tax authority's view in each specific case.
Legal basis: step 3 of the checklist; the stated uncertain point in this article's legal review.
Next step: have the payment structure legally reviewed before filing — especially multi-tier cross-border arrangements — rather than explaining after an inspection begins.
References
- Circular No. 95/2026/TT-BTC of 1 July 2026 guiding implementation of double tax avoidance agreements and prevention of tax evasion; guiding the mutual agreement procedure; guiding advance pricing agreements (effective from signing; replacing Circular 205/2013/TT-BTC and Circular 45/2021/TT-BTC)
- Circular No. 89/2026/TT-BTC of 30 June 2026 guiding the Tax Administration Law and Decree 252/2026/ND-CP (effective 1 July 2026; replacing Circular 80/2021/TT-BTC; abolishing Circular 103/2014/TT-BTC) — Article 78: treaty-based tax exemption/reduction dossiers for foreign contractors
- Tax Administration Law No. 108/2025/QH15 (effective 1 July 2026) — Article 5: international tax cooperation; tax administration under international tax treaties
- Decree No. 320/2025/ND-CP of 15 December 2025 detailing the Corporate Income Tax Law 2025 — Clause 3, Article 12: CIT rates for foreign enterprises (services 5%, royalties 10%, loan interest 5%, capital transfers 2%)
- Circular No. 20/2026/TT-BTC guiding corporate income tax — Article 7: CIT for foreign enterprises doing business in Vietnam
- Circular No. 69/2025/TT-BTC guiding value-added tax — foreign loan interest and royalties are VAT-exempt
- Vietnam–China double tax avoidance agreement (signed 17 May 1995, effective 18 October 1996) — 10% caps on interest, royalties, and dividends
- Circular No. 205/2013/TT-BTC of 24 December 2013 (replaced from 1 July 2026), Circular No. 80/2021/TT-BTC (expired 1 July 2026), Circular No. 103/2014/TT-BTC (abolished) — cited only to identify old instruments, not for current obligations