Consulting Services Contract with a Foreign Partner in Vietnam: Structure and Foreign Contractor Tax

Consulting services contract with a foreign partner: standard structure and foreign contractor tax obligations

Hiring a foreign consulting partner — an international law firm, a foreign engineering consultant, an audit firm or a strategy adviser — is everyday business for Vietnamese companies, especially FDI enterprises. But behind a seemingly simple consulting services contract with a foreign partner sit two layers of risk that many businesses discover too late: contract terms too weak to protect them when the partner is on the other side of the border, and the foreign contractor tax obligation arising at the very moment of payment — money the Vietnamese party must withhold, declare and remit on the foreign partner's behalf.

In 2026, the legal framework for both risk layers has changed. Circular 103/2014/TT-BTC, which governed contractor tax for over a decade, was formally repealed from 01/07/2026 under Article 99 of Circular 89/2026/TT-BTC. The corporate income tax portion for foreign contractors was replaced by Circular 20/2026/TT-BTC from 12/03/2026, applicable from the 2025 tax year. This article walks through the full structure of a consulting services contract with a foreign partner, the ten key clauses to negotiate, and all foreign contractor tax duties the Vietnamese party must perform.

Contents

1. What is a consulting services contract with a foreign partner? Who should care?
2. Current legal framework as of 2026
3. Ten key clauses in the contract
4. Foreign contractor tax: the Vietnamese party's duties when paying a foreign partner
5. Costs, timelines and key dates
6. Common risks and mistakes
7. Pre-signing checklist
8. Frequently asked questions
9. When to work with a lawyer

1. What is a consulting services contract with a foreign partner? Who should care? {#muc-1}

Legally, a consulting contract is a form of services contract under Article 513 of the Civil Code 2015: an agreement under which the service provider performs work for the service user, and the service user must pay the provider. What makes this article's contract special is the foreign element of the provider: the consulting partner is a foreign organization or individual, typically with no commercial presence in Vietnam, delivering services from abroad or coming to Vietnam to perform part of the work.

In practice, Vietnamese businesses hire foreign consultants in many situations: international law firms advising cross-border M&A deals; foreign engineering consultants supervising construction and technology transfer; international audit and tax advisers; strategy consultants and ERP implementers; foreign designers and project appraisers. The service user may be a purely Vietnamese company or an FDI enterprise operating in Vietnam.

This contract differs from a domestic services contract in two decisive ways. First, the cross-border element raises issues that do not exist domestically: payment currency, governing law, dispute resolution when one party is abroad, and enforceability of awards. Second, the moment the Vietnamese party pays the foreign partner, the foreign contractor tax duty arises — the Vietnamese party becomes responsible for withholding, declaring and remitting tax on the foreign contractor's behalf. Ignoring this duty does not make it disappear; it merely converts into reassessment and penalty risk when the tax authority audits.

2. Current legal framework as of 2026 {#muc-2}

Before going clause by clause, get the governing instruments right. 2026 brought major tax changes, so citing instruments still in force is the first requirement.

On the contractual relationship. The Civil Code 2015 (91/2015/QH13), effective 01/01/2017, governs services contracts in Section 9 of Chapter XVI, Articles 513–521. The provisions most important here: Article 513 defines the services contract; Articles 515–516 set the service user's duties and rights; Articles 517–518 set the provider's duties and rights; Article 520 governs unilateral termination of a services contract. Where the services contract is commercial — tied to a merchant's commercial activity — the Commercial Law 2005 (36/2005/QH11) also applies; Article 74 provides that a services contract may be expressed orally, in writing, or established by specific conduct, while services contracts the law requires to be in writing must follow that requirement.

On foreign contractor tax. This is the biggest change of 2026:

• Circular 20/2026/TT-BTC of the Ministry of Finance, effective 12/03/2026 and applicable from the 2025 tax year, guides the Corporate Income Tax Law 2025 and Decree 320/2025/ND-CP. Article 10(4) provides expressly: the CIT-policy provisions at Articles 1, 2, 7, 10, 13 (except point 6.11 of Article 13(1)) and 16 of Circular 103/2014/TT-BTC are repealed. In other words, Circular 103's CIT guidance for foreign contractors has been replaced by Circular 20. Article 7 of Circular 20 guides CIT determination for foreign enterprises, based on Decree 320/2025/ND-CP Article 12(3).
• Circular 89/2026/TT-BTC of the Ministry of Finance, issued 30/06/2026, effective 01/07/2026, implements the Tax Administration Law 2025 and Decree 252/2026/ND-CP. The key point is Article 99: Circular 89 repeals Circular 103/2014/TT-BTC in full. From 01/07/2026, contractor tax filing follows Article 30 of Circular 89, using foreign contractor tax return form 03/NTNN in Appendix I.
• Tax Administration Law 2025 (108/2025/QH15), passed 10/12/2025, effective 01/07/2026, replacing the Tax Administration Law 2019. Decree 252/2026/ND-CP of 30/06/2026 details this law, also effective 01/07/2026.

The point to burn into memory: Circular 103/2014/TT-BTC expired on 01/07/2026. Every model contract, internal accounting procedure or training material still citing Circular 103 as in force must be updated. Citing an expired instrument is one of the most common errors in 2026 tax compliance reviews.

3. Ten key clauses in the contract {#muc-3}

A well-drafted consulting services contract with a foreign partner is not merely an English translation of a domestic contract. The ten clauses below are the points lawyers most often have to fix when reviewing partner-supplied drafts.

3.1. Scope of work and acceptance criteria

This is the most important clause and also the most sloppily written. The scope must describe specifically what the partner will do, how, and what the deliverables are — a consulting report, design drawings, a legal opinion, or a deployed system. Alongside it come acceptance criteria: by what standard the Vietnamese party confirms satisfactory completion. For consulting services, deliverables are typically intellectual, so acceptance criteria should tie to verifiable milestones: reports delivered on time, reports covering the listed contents, or a system passing testing. Article 516 of the Civil Code 2015 gives the service user the right to require the provider to perform with the agreed quality, quantity, timing, place and other terms — but this right has practical value only if the contract has defined what "agreed quality" means.

3.2. Service fees, pricing mechanism and payment currency

Fees should follow one of three mechanisms: lump sum by deliverable milestones, time-based billing (hourly/daily rates), or success fees tied to outcomes. With foreign partners, state the payment currency clearly — usually USD or EUR — and a mechanism for exchange-rate movement where payment stretches over installments. Critically, state whether the price includes foreign contractor tax and VAT, because that wording directly determines the Vietnamese party's actual outlay (see section 4). Article 517 of the Civil Code 2015 places the duty of proper performance on the provider, and the user's duty to pay arises only as the contract agreed — so every price component must be written out, nothing left implied.

3.3. Term, place of performance and progress reporting

The contract should fix the start date, interim milestones and completion date, plus the place of performance — in Vietnam, abroad, or both. Place of performance is not only a project-management issue but directly affects the foreign contractor tax duty: services performed in Vietnam and services performed entirely abroad may face different tax treatment. Also provide for periodic progress reporting by the partner — weekly reports or milestone reports — so the Vietnamese party detects delays early rather than learning of them after the deadline.

3.4. The tax clause: who bears foreign contractor tax

This is the clause with real money in it, yet it is often left blank in partner-supplied drafts. Three things must be stated: first, whether the contract price is tax-inclusive (gross) or tax-exclusive (net); second, the Vietnamese party's duty to withhold contractor tax before payment and remit it to the state budget on the partner's behalf; third, an adjustment mechanism if tax rates change during performance. If the contract states a net price and the Vietnamese party agrees to bear the tax, gross-up applies: the taxable revenue will exceed the net contract price, and the effective total cost rises accordingly. Without a clear tax clause, disputes are almost certain at the first payment.

3.5. Governing law and dispute resolution

The parties may agree on governing law, but feasibility must be weighed: choosing a foreign law for a contract performed mainly in Vietnam can create difficulties in interpretation and application. On dispute resolution, common options are arbitration in Vietnam (e.g., VIAC), international arbitration (e.g., SIAC, HKIAC, ICC), or courts. When choosing foreign arbitration, consider the recognition and enforcement of foreign arbitral awards in Vietnam — a won award that cannot be enforced where the partner holds assets has very limited real value. This clause needs careful checking by the legal team before signing, because once a dispute arises it is too late to fix.

3.6. Confidentiality and intellectual property

Consulting services mean the foreign partner gains access to the company's sensitive internal information: financial data, business strategy, technical know-how. Article 517 of the Civil Code 2015 already imposes a confidentiality duty on the provider where agreed or required by law, but the contract should specify: the scope of confidential information, the post-termination duration of the duty, and sanctions for breach. Alongside it is IP in the consulting deliverables: reports, designs, software and documents created by the partner during performance — who owns them, and to what extent the Vietnamese party may use them. Without clear terms, a company may find it has paid in full yet lacks the right to use the deliverables for its own purposes.

3.7. Non-compete and non-solicitation

After completing a project, the consulting partner typically knows the business — and its team — very well. A non-solicitation clause prevents the partner from poaching key personnel of the Vietnamese party for a set period after the contract ends. Depending on the sector, a reasonably scoped non-compete may be considered. These restrictive clauses should be drafted with reasonable scope, duration and territory to be enforceable, avoiding overbreadth that renders them ineffective in practice.

3.8. Termination and unilateral termination

Beyond agreed termination, services contracts have a special regime at Article 520 of the Civil Code 2015: where continuing the work is no longer beneficial to the service user, the user may unilaterally terminate performance, provided it gives the provider reasonable prior notice, while paying for the performed portion and compensating damages. Conversely, where the service user seriously breaches — typically non-payment — the provider may unilaterally terminate and claim damages. In foreign-partner contracts, "reasonable notice" should be concretized into a specific number of days, and the mechanism for paying and handing over work-in-progress upon mid-term termination should be clear, leaving no gap for each side to read differently.

3.9. Force majeure and limitation of liability

The force majeure clause should list qualifying events and provide notice and mitigation duties for the affected party. For cross-border contracts, consider specific risks such as policy changes, fund-transfer restrictions, or international logistics disruptions. Alongside it is the limitation-of-liability clause: consulting partners often propose capping liability at the fees received or a multiple of fees. The Vietnamese party must assess whether that cap is proportionate to the potential loss, especially for high-value engineering or legal consulting projects.

3.10. Contract language and effectiveness

Contracts with foreign partners are usually bilingual Vietnamese–English. The language clause must state which version prevails in case of conflict. In practice many bilingual contracts leave this blank, only to discover at dispute time that the two versions differ on a key clause. Also state when the contract takes effect, its duration, renewal conditions, and amendment procedures — every amendment should be in a written document signed by authorized persons of both parties.

4. Foreign contractor tax: the Vietnamese party's duties when paying a foreign partner {#muc-4}

This is the part that surprises many Vietnamese businesses most: when paying the foreign partner, it is the Vietnamese company — not the partner — that must withhold part of the payment, declare and remit it to the state budget. This duty is called foreign contractor tax, and in 2026 its legal framework changed fundamentally.

4.1. When the withholding duty arises

The duty arises when the foreign contractor earns Vietnam-sourced taxable income from the services contract. Under the guidance at Article 7 of Circular 20/2026/TT-BTC, determining the taxable objects turns on the nature of the transaction, with the place of performance playing a key role: services performed in Vietnam, or tied to goods or services in Vietnam, are typically taxable. Conversely, services performed and completed entirely abroad, unconnected to activity in Vietnam, may fall outside the tax scope — but this classification must be assessed per contract, based on documentation of where services were performed. Businesses should not self-conclude an exemption without clear file support, because on audit the burden of proof rests on the Vietnamese party.

4.2. Computation: tax rates for consulting services

Foreign contractor tax on consulting services comprises two taxes, both computed on the taxable revenue:

• Corporate income tax: 5% on taxable revenue, the rate for services activities at Decree 320/2025/ND-CP Article 12(3), implemented by Circular 20/2026/TT-BTC Article 7. Formula: CIT payable = taxable revenue × 5%.
• Value-added tax: 5% computed directly on revenue, per the 2026 contractor-tax rate lookup table for ordinary services.

Total contractor tax to withhold for an ordinary consulting contract is therefore about 10% of the tax-inclusive contract value. The important change under Circular 20/2026/TT-BTC lies in determining the CIT-taxable revenue: it is the entire revenue the foreign contractor receives, including taxes and expenses the Vietnamese party pays on its behalf. Where the contract price is tax-exclusive, the Vietnamese party must gross up to a tax-inclusive price before computing.

Illustration: a Vietnamese company hires a Singaporean engineering consultant for USD 100,000, tax-inclusive price, services performed in Vietnam. VAT to withhold: USD 100,000 × 5% = USD 5,000; CIT to withhold: USD 100,000 × 5% = USD 5,000. Total contractor tax withheld: USD 10,000; the net amount paid to the foreign contractor: USD 90,000. If the contract states USD 100,000 as the tax-exclusive price with the Vietnamese party bearing the tax, gross-up applies: the taxable revenue exceeds USD 100,000 and the tax payable rises accordingly. That is why the net-versus-gross price clause is a clause with real money in it.

Where the contract covers multiple activities — e.g., equipment supply plus installation and consulting — the rates apply to each activity's revenue under the contract. If the values cannot be separated, the highest-rate industry's rate applies to the entire contract value. Separating the consulting value from the goods/equipment value in the contract therefore not only serves project management but directly affects the tax payable.

The 5% rate above now rests on a current legal basis, no longer on a repealed instrument: point b2, Article 12(2) of the 2024 Law on Value Added Tax sets the rate at “Services, construction without supply of materials: 5%”, applied to foreign contractor VAT by Article 9 of Circular 69/2025/TT-BTC (effective 1 July 2025) — VAT payable equals taxable revenue multiplied by the percentage rate (Article 9(4), 9(6)). Taxable revenue is the full revenue the foreign contractor receives from the services, before deducting taxes payable, including expenses paid on its behalf by the Vietnamese party (Article 13, Decree 181/2025/ND-CP). The VAT provisions for foreign contractors in Articles 6, 9, 12 and 15 of Circular 103/2014/TT-BTC were repealed from 1 July 2025 (Article 10(3)(c), Circular 69/2025/TT-BTC); Circular 103/2014/TT-BTC itself expired in full from 1 July 2026 (Article 99(1), Circular 89/2026/TT-BTC).

4.3. Filing and payment: timing and dossiers

From 01/07/2026, contractor tax filing is unified under Article 30 of Circular 89/2026/TT-BTC. The core principle: where VAT is paid directly on revenue and CIT is paid at percentage rates on taxable revenue, filing is per payment to the foreign contractor, with a finalization filing at contract completion if the declared and paid tax changes. Where the Vietnamese party makes multiple payments in a month, it may register for monthly filing instead of per-payment filing.

The foreign contractor tax return uses Form 03/NTNN in Appendix I of Circular 89/2026/TT-BTC. Note: the filing duty arises per payment, not deferred to year-end or contract-end in one summary. Late filing or late payment of contractor tax is handled like other late filings and payments under the Tax Administration Law 2025.

4.4. Treaty relief under double tax agreements

If the consultant's country of residence has a double tax treaty with Vietnam and the partner meets the treaty conditions — including proof of tax-residence status in the treaty country — treaty exemption or reduction may be applied, with procedures guided by Circular 89/2026/TT-BTC. However, services-income provisions differ by treaty, and not every consulting service type is automatically exempt or reduced. Businesses must check the specific treaty between Vietnam and the partner's residence country and prepare the partner's tax-residence certificate before applying. This point deserves lawyer or tax-adviser review before filing, because misapplying a treaty leads to full reassessment of the relieved tax.

4.5. Notes for contracts signed before the transition

Circular 20/2026/TT-BTC has transitional rules: contractor and sub-contractor contracts using the hybrid method and signed before the Circular's effective date (12/03/2026) continue to determine CIT duties under the normative documents in force at signing. Contracts outside this transitional scope follow the new framework. Businesses with ongoing foreign-partner services contracts should review them all: which category the contract falls into, whether the applicable rates changed, and whether the price clause still fits the new computation method.

5. Costs, timelines and key dates {#muc-5}

On tax duties, the statutory timelines businesses must observe:

• Per payment: file contractor tax per payment to the foreign contractor under Article 30 of Circular 89/2026/TT-BTC. With multiple payments in a month, the business may register for monthly filing.
• At contract completion: file a finalization return if the declared and paid tax changed during performance.
• Framework transition milestones: Circular 20/2026/TT-BTC effective 12/03/2026, applicable from the 2025 tax year; Circular 89/2026/TT-BTC effective 01/07/2026, from which Circular 103/2014/TT-BTC expired and contractor tax filing follows the new forms.

On legal fees for drafting and reviewing consulting services contracts with foreign partners and contractor tax advice, each matter differs in complexity by contract value, transaction structure and foreign elements involved. Contact FLAT for a per-matter quote via hotline 0988424851.

6. Common risks and mistakes {#muc-6}

Mistake 1: No tax clause in the contract; the fight over who bears contractor tax erupts at payment. Partner-supplied drafts often state only the service price with no mention of tax. The consequence: the Vietnamese party by default withholds 10% before payment, the partner objects that the price was final, and the project stalls at the first payment round. The only prevention is stating net or gross and the gross-up mechanism in the price clause itself.

Mistake 2: Citing Circular 103/2014/TT-BTC as in force. Internal accounting procedures and model contracts drafted before 2026 still cite Circular 103. From 01/07/2026 it was repealed in full under Article 99 of Circular 89/2026/TT-BTC. Applying the old rules — particularly the old CIT-taxable-revenue determination — produces wrong withholding amounts and reassessment at finalization.

Mistake 3: Bilingual contract with no prevailing-language clause. When a dispute arises, each side cites the language version favoring it. Without a stated prevailing version, interpreting the contract becomes complex and costly, especially before international arbitration.

Mistake 4: Vague scope of work, no acceptance criteria. Phrases like "technical support" or "general strategy consulting" give the Vietnamese party no basis to assess whether the partner performed. When deliverables are thin, the company has no legal ground to reject acceptance or demand rework.

Mistake 5: Choosing a dispute mechanism without considering enforceability. Agreeing to arbitration at a remote center or an unsuitable governing law can make the cost of pursuing the dispute exceed the loss, or leave a won award unenforceable where the partner holds assets.

Mistake 6: Forgetting the per-payment filing duty. Many businesses file once at year-end, while Article 30 of Circular 89/2026/TT-BTC requires filing per payment event. Late filing and payment attract late-payment interest and administrative tax penalties.

Mistake 7: Not separating services value from goods value in mixed contracts. Where a contract covers both equipment supply and consulting/installation without separating each part's value, the tax authority applies the highest-rate industry's rate to the entire contract value — the business loses the chance of a lower rate for the goods portion.

7. Pre-signing checklist {#muc-7}

• [ ] Scope of work described specifically, with clear deliverables and acceptance criteria
• [ ] Contract price stated as net or gross, with the contractor-tax bearer and gross-up mechanism
• [ ] Term, delivery milestones, place of performance and progress-reporting duties complete
• [ ] Confidentiality clause, IP in deliverables, and post-contract duty duration
• [ ] Non-solicitation provision and non-compete scope (if needed)
• [ ] Termination clause, notice period for unilateral termination, payment mechanism for work-in-progress
• [ ] Governing law, dispute resolution mechanism, and prevailing language of the bilingual contract
• [ ] Contractor tax duties determined: taxable objects, applicable rates, per-payment filing timing, and the person responsible for filing

8. Frequently asked questions {#muc-8}

Does hiring a foreign expert for 100% online consulting, with no presence in Vietnam, trigger contractor tax withholding?

Not automatically. The duty arises when the foreign contractor earns Vietnam-sourced taxable income, which depends on where services are performed and the transaction's nature under Article 7 of Circular 20/2026/TT-BTC. Services performed entirely abroad, unconnected to goods or services in Vietnam, may fall outside the tax scope. However, classification must be assessed per contract with full documentation of where services were performed. If in doubt, seek legal advice before deciding not to withhold.

If the contract price is tax-exclusive, how is contractor tax computed?

It must be grossed up to a tax-inclusive price first. Under Circular 20/2026/TT-BTC, the foreign contractor's CIT-taxable revenue is the entire revenue, including taxes and expenses the Vietnamese party pays on its behalf. The price clause must therefore state net or gross and who bears the contractor tax — a clause directly determining the company's effective total cost.

Which tax framework applies to a services contract signed before 01/07/2026?

It depends on timing and the method applied. The CIT portion follows the new framework of Circular 20/2026/TT-BTC, effective 12/03/2026 and applicable from the 2025 tax year; contractor contracts using the hybrid method signed before 12/03/2026 continue under the old rules per the transitional clause at Article 10(4) of Circular 20. From 01/07/2026, contractor tax filing follows Article 30 of Circular 89/2026/TT-BTC with form 03/NTNN. Businesses with ongoing contracts should review them all to determine their category.

Is withheld contractor VAT creditable as input VAT?

In principle, VAT the Vietnamese party withholds and remits for the foreign contractor may be declared and credited as input VAT if the documentation and taxable-object conditions under current VAT law are fully met. Specific conditions depend on the service nature and the file of each transaction, so current guidance should be checked before crediting.

Can a double tax treaty reduce contractor tax on consulting services?

Possibly, but not automatically. If the consultant's residence country has a double tax treaty with Vietnam and the partner meets the treaty conditions — including a tax-residence certificate — treaty exemption or reduction procedures may be applied, guided by Circular 89/2026/TT-BTC. However, services-income provisions differ by treaty; the specific treaty must be checked and the file prepared fully before applying.

9. When to work with a lawyer {#muc-9}

Work with a lawyer when: the services contract value is large with a complex multi-installment payment structure; the contract is partner-supplied with one-sided terms; the transaction has special features such as technology transfer, access to sensitive data, or multiple governing laws; the company is unsure about the contractor tax duties for its service model; or disputes over service quality, payment or tax with the partner have already arisen.

FLAT Law Firm advises on drafting and negotiating services contracts with foreign partners and handles all contractor tax duties — from determining taxable objects, gross-up computation and return preparation, to double tax treaty review. Contact hotline 0988424851 for advice on your company's specific matter.

References

• Civil Code 2015 (91/2015/QH13)
• Commercial Law 2005 (36/2005/QH11)
• Circular 20/2026/TT-BTC of the Ministry of Finance on corporate income tax
• Circular 89/2026/TT-BTC of the Ministry of Finance on tax administration
• Decree 320/2025/ND-CP on corporate income tax
• Tax Administration Law 2025 (108/2025/QH15)
• Decree 252/2026/ND-CP detailing the Tax Administration Law