Foreign Contractor Tax Handbook for Construction Contractors in Vietnam

A Korean construction group wins the EPC package for a power plant in Quang Ninh: a contract worth VND 1,200 billion, covering both equipment imported from Korea and on-site construction work. Before the first advance payment, the Vietnamese employer's chief financial officer calls and asks: "What percentage of foreign contractor tax must we withhold? Are the equipment portion and the construction portion taxed at one rate or split? Which declaration form, filed where?" — These are the classic questions nearly every project with a foreign construction contractor faces, and since mid-2026 the answers have fundamentally changed, because the foreign contractor tax (FCT) legal framework has been almost entirely rewritten.

This handbook walks through the full life cycle of a foreign construction contractor's tax obligations in Vietnam — from the legal conditions for operating, to determining the tax rate for each type of work, computing tax on gross and net prices, through declaration, payment, and finalization when the contract ends — under the legal framework in force as of late September 2026. The primary audience is foreign construction contractors (EPC, civil works, equipment installation) and the Vietnamese employers and general contractors with withholding and payment-on-behalf duties.

1. How the Construction Foreign Contractor Tax Framework Changed from 2026

For many years, Circular 103/2014/TT-BTC (Thông tư 103/2014/TT-BTC) was the go-to instrument for every accountant working with foreign contractors. From 2026, that circular has officially left the stage in two steps:

• From 12/3/2026, Circular 20/2026/TT-BTC (Thông tư 20/2026/TT-BTC) — guiding Decree 320/2025/ND-CP on corporate income tax — took effect and repealed the provisions on corporate income tax policy in Circular 103/2014/TT-BTC, i.e. the entire CIT portion for foreign contractors moved to the new framework.
• From 01/7/2026, Circular 89/2026/TT-BTC (Thông tư 89/2026/TT-BTC) — guiding the Law on Tax Administration — took effect and repealed Circular 103/2014/TT-BTC in full, while establishing an entirely new system of declaration forms and FCT filing dossiers.

The current legal framework for foreign construction contractor tax has four layers: the Law on Corporate Income Tax 2025 (67/2025/QH15, effective 01/10/2025) and the Law on Value Added Tax 2024 (48/2024/QH15, effective 01/7/2025) at the statute level; Decrees 320/2025/ND-CP and 181/2025/ND-CP at the decree level; and Circular 20/2026/TT-BTC (CIT policy) and Circular 89/2026/TT-BTC (tax administration procedures) at the circular level. This article cites only instruments still in force; Circular 103/2014/TT-BTC is mentioned only in its historical context and under the transitional rules.

One very practical transitional point: contractor and sub-contractor contracts currently applying the mixed method under Circular 103/2014/TT-BTC that were signed before 12/3/2026 continue to determine CIT obligations under the instruments in force at the time of signing. In other words, on the same construction site, two packages signed at different times may be running under two different tax frameworks — the project accountant must distinguish them clearly rather than applying one formula to everything.

2. Prerequisites: Construction Operation License, Operating Office, Tax Code

Before discussing tax rates, a foreign construction contractor must legalize its presence in Vietnam. Under Article 119 of Decree 175/2024/ND-CP (Nghị định 175/2024/ND-CP) (as amended and supplemented), a foreign contractor has the following obligations:

• Obtain a construction operation license before performing the contract; enjoy protection of lawful business interests in Vietnam within the scope of the license granted.
• Establish an operating office at the project location after the construction operation license is issued; register the operating office's address, telephone number, email, seal, bank account, and tax code. The operating office exists only for the duration of the contract and is dissolved when the contract expires.
• Register and pay tax in accordance with Vietnamese law, maintain accounting records, and open accounts and make payments as guided by the Ministry of Finance and the State Bank of Vietnam to serve business operations under the contract.

In tax terms, this means a foreign construction contractor is not a "ghost" appearing only on payment invoices: it has its own tax code in Vietnam, can directly declare and pay tax in certain cases, and upon contract completion must settle its tax obligations before dissolving the operating office. When selecting a contractor, the employer should verify that the construction operation license is still valid, because a contract signed with a contractor lacking the legal conditions may put the validity of the entire payment and finalization dossier at risk.

3. Two Tax Payment Methods: Direct on Revenue or Revenue-Minus-Expense Declaration

Under Article 30 of Circular 89/2026/TT-BTC, foreign contractors and foreign sub-contractors have two routes for paying VAT and CIT:

The direct method (the most common in practice). The contractor pays VAT computed directly on revenue and pays CIT at a fixed percentage of taxable revenue. This is the default method most foreign construction contractors use, because it is simple: tax payable equals taxable revenue multiplied by the fixed rate for each type of work, with no need to account for expenses under Vietnamese accounting standards.

The declaration method. The foreign contractor declares VAT under the credit method (guided by Article 19 of Circular 89/2026/TT-BTC) and declares CIT on the basis of declared revenue and expenses to determine taxable income (guided by Article 21 of Circular 89/2026/TT-BTC). This method requires the contractor to satisfy conditions on tax registration, accounting regime, and contract duration set out in detail in Circular 89/2026/TT-BTC — businesses must check each condition before choosing, because not every contractor qualifies and the declaration method is not always more advantageous for every project.

For the remainder of this handbook, we focus on the direct method — the scenario covering the majority of construction projects with a foreign element in practice.

4. Foreign Contractor Tax Rates for Construction: The Actual Numbers

This is the most looked-up part. Based on Article 12(3) of Decree 320/2025/ND-CP, Article 7 of Circular 20/2026/TT-BTC, and the guidance on VAT for foreign contractors, the rates for construction work are:

Two important notes when reading this table:

First, the 2% CIT rate applies uniformly to the "construction, transport and other activities" group under Decree 320/2025/ND-CP — regardless of whether materials are supplied by the contractor. The difference lies in VAT: 3% when the contractor supplies the materials, 5% when it does not.

Second, in an EPC contract or a turnkey general contract, alongside the civil works there is typically an equipment supply portion and a services portion (engineering design, supervision consultancy, operation training). Each workstream has its own rate: for example, ordinary services bear 5% VAT and 5% CIT (10% in total), while goods supplied through on-spot import/export bear 1% VAT and 1% CIT. Correctly classifying each workstream in the contract therefore directly affects the tax payable — this is analyzed in depth in section 6.

5. How the Tax Is Computed: Gross Price, Net Price, and the Conversion Formula

5.1. What taxable revenue is

Under Article 7 of Circular 20/2026/TT-BTC, a foreign contractor's CIT taxable revenue is all revenue the contractor receives, without deducting taxes payable — including expenses paid by the Vietnamese party on the contractor's behalf (if any). The same principle applies to VAT computed directly on revenue. In other words, the tax base is always the "gross" figure — tax-inclusive.

5.2. Gross-price contracts: compute directly

This is the simplest case: the contract states a tax-inclusive price, and the Vietnamese party withholds tax on the payment amount itself, remitting the balance to the contractor.

Example 1. A civil works package with materials supplied by the contractor, contract price (gross) VND 100 billion. Tax to withhold on each payment:

• VAT = 100 billion × 3% = VND 3 billion.
• CIT = 100 billion × 2% = VND 2 billion.
• Total tax withheld: VND 5 billion; the contractor actually receives VND 95 billion.

Example 2. A construction labor package without materials supplied by the contractor, contract price (gross) VND 50 billion:

• VAT = 50 billion × 5% = VND 2.5 billion.
• CIT = 50 billion × 2% = VND 1 billion.
• Total tax withheld: VND 3.5 billion; the contractor actually receives VND 46.5 billion.

5.3. Net-price contracts: convert back to gross

Many foreign contractors negotiate on a net basis — "I take home X, the Vietnamese side bears all taxes." In that case X cannot simply be multiplied by the tax rates, because X is not tax-inclusive while tax is computed on tax-inclusive revenue. A conversion is required:

Taxable revenue = Net price ÷ (1 − combined tax rate)

Example 3. A construction contract with materials supplied by the contractor, net price VND 100 billion (the contractor takes home the full 100 billion; the Vietnamese side bears all tax). Combined rate = 3% + 2% = 5%:

• Taxable revenue = 100 ÷ (1 − 0.05) = VND 105.263 billion.
• VAT = 105.263 × 3% = VND 3.158 billion.
• CIT = 105.263 × 2% = VND 2.105 billion.
• Total tax the Vietnamese party must pay on the contractor's behalf: VND 5.263 billion; the employer's actual total cost is VND 105.263 billion.

The common mistake is computing 100 billion × 5% = 5 billion — VND 263 million short of the correct figure, and that shortfall will be reassessed together with late-payment interest upon inspection. On high-value contracts, the absolute gap grows proportionally.

One point in the Vietnamese party's favor where it bears the tax: under the CIT guidance, CIT paid on a foreign contractor's behalf is deductible in computing the payer's own CIT where the contract provides that the contractor's revenue excludes CIT (a net-price contract). Businesses should note this condition when finalizing their own CIT.

6. Splitting Mixed Contracts: The Hardest Problem in EPC Projects

An EPC (engineering–procurement–construction) contract or a turnkey general contract rarely covers a single type of work. A typical contract may include: engineering design (services), imported equipment supply (goods), civil construction (construction), and operation training (services). Each group bears a different rate, and how the contract value is allocated across groups directly determines the tax payable.

The handling rules under Article 7 of Circular 20/2026/TT-BTC (corporate income tax) and Article 9(6)(b) of Circular 69/2025/TT-BTC (value-added tax):

• Value of each workstream can be separated: apply each part's own rate according to its true nature. This is the safest approach and should be reflected in the contract's price appendix from the negotiation stage.
• Value of each workstream cannot be separated: apply the rate of the business line with the highest rate to the entire contract value — for CIT, the highest CIT rate among the contract's activities; for VAT, the highest VAT-on-revenue rate among them. This is a mandatory rule, not a matter of "negotiating with the tax authority based on the predominant workstream" as older practice sometimes suggested.

A special exception for construction with materials. For construction work that includes the supply of raw materials, or machinery and equipment accompanying the construction project, a dedicated rule applies:

• Where the contract separates the value of each activity, each portion of the contract value takes the rate corresponding to its activity.
• Where the contract cannot separate them, CIT is 2% of the entire contract value; VAT is 3% of the entire contract value, including the value of imported materials, machinery, and equipment.

In other words, for a lump-sum EPC contract that includes the supply of materials and cannot be broken down by workstream, the combined contractor-tax rate to withhold is 5% (3% VAT + 2% CIT) on the full contract value — matching the combined rate for "construction and installation with supply of materials" set out in section 4.

One scenario deserves attention: a foreign contractor subcontracts all the material-supply portions or work items to subcontractors and itself performs only the remaining services — the services it performs are then taxed under the services business line: 5% VAT and 5% CIT.

Hence the practical recommendation: from the moment an EPC contract with a foreign contractor is drafted, request a detailed value allocation by workstream group (design, equipment, civil works, other services) with projected rates. A few extra days of negotiation at the start of a project cost far less than a reassessment decision at the end of it — and for a construction-with-materials contract, a clean breakdown is also the condition for not paying VAT again on materials, machinery, and equipment whose VAT was already paid at importation.

7. Declaration, Payment, and Finalization: Procedures under Circular 89/2026/TT-BTC

7.1. Who declares, and where

Under Article 30(2) of Circular 89/2026/TT-BTC, for the direct method:

• The Vietnamese party contracting with the foreign contractor withholds and pays tax on the foreign contractor's behalf, and files tax declarations and tax finalization dossiers with the tax authority directly managing the Vietnamese party.
• Where the foreign contractor pays tax directly, the contractor self-declares with the tax authority as guided.

7.2. Declaration periods

Declare each time a payment is made to the foreign contractor. If the Vietnamese party pays the foreign contractor multiple times within a month, it may register to declare monthly instead of per payment — a flexibility worth noting for projects with dense payment schedules (advance payments, monthly volume-based payments, final settlement payments).

At the end of the contractor contract, a finalization return must be filed if the tax declared and paid differs from the actual tax payable — for example where the final settlement value differs from the total of the payment tranches already declared.

7.3. The new declaration form system

From 01/7/2026, FCT declaration dossiers follow the form system in Appendix I of Circular 89/2026/TT-BTC, including three forms directly relevant to foreign construction contractors:

• Form 01/NTNN: the foreign contractor tax declaration for the Vietnamese party withholding and paying tax on the foreign contractor's behalf — the most commonly used form in construction projects.
• Form 02/NTNN: the foreign contractor tax finalization declaration, for the Vietnamese party withholding and paying on the contractor's behalf.
• Form 03/NTNN: the foreign contractor tax declaration for the foreign contractor directly paying CIT at a percentage of taxable revenue.

The detailed step-by-step declaration process — from registering the FCT obligation, to filing deadlines, to completing each line item — is covered in depth in "Foreign Contractor Tax (FCT) 2026: When to Withhold, How to Compute and Declare" (T-159); this handbook focuses on the specifics of construction contractors and does not repeat the general procedures.

8. Double Taxation Agreements: An Opportunity to Reduce CIT

The 2% CIT of a foreign construction contractor may be exempted or reduced under the double taxation agreement (DTA) Vietnam has signed with the contractor's country of residence — if the income is classified as business profits and the contractor has no permanent establishment in Vietnam within the meaning of the treaty.

However, this possibility is not automatic and depends entirely on the terms of each specific bilateral treaty. For construction contractors, the point needing special attention is that many treaties provide that a building site or installation project lasting beyond a certain threshold (typically 6 or 12 months depending on the treaty) constitutes a permanent establishment — in which case Vietnam may tax the profits attributable to that permanent establishment, and the DTA relief opportunity may disappear. Businesses must check the applicable treaty directly and complete the exemption/reduction dossier as guided by Circular 89/2026/TT-BTC before counting on this relief.

9. Five Common Risks and How to Prevent Them

Risk 1: Applying the wrong rate by failing to distinguish whether materials are supplied by the contractor. The contract says "turnkey construction" but in reality the employer supplies all principal materials — the work may then be reclassified as "without materials supplied by the contractor" at 5% VAT instead of 3%. Prevention: state clearly in the contract which party supplies materials, and keep full purchase documentation from the supplying party.

Risk 2: Computing tax on the net price without conversion. As analyzed in section 5.3, multiplying the net price directly by the rates always produces a shortfall. Every net-price contract must have a conversion schedule confirmed by both parties.

Risk 3: Forgetting finalization when the contract ends. Many projects declare and pay correctly on each payment tranche but skip finalization when the final settlement value changes (volume increases/decreases). The undeclared difference is a classic reassessment target in post-project inspections.

Risk 4: Two legal frameworks on the same construction site. A package signed before 12/3/2026 under the Circular 103/2014 mixed method continues to apply the old rules for CIT, while a later-signed package applies the new framework. The project accountant must keep a separate tracking sheet per contract, recording the applicable legal framework and the signing date.

Risk 5: Missing tax obligations for construction machinery and equipment brought into Vietnam. Foreign construction contractors often bring machinery and equipment into Vietnam under temporary import for re-export or as imports to serve the project. Import duty and import-stage VAT are a separate area governed by customs law — this handbook only flags that businesses must review that area separately, not fold it into foreign contractor tax.

10. Implementation Checklist for Employers and Contractors

1. Verify that the foreign contractor holds a valid construction operation license covering the contract's scope of work.
2. Confirm that the contractor has established an operating office and registered a tax code in Vietnam.
3. Classify each workstream in the contract (design, equipment, civil works, services) and determine the separate rate for each; split each part's value in the contract appendix.
4. Determine whether the contract is gross- or net-priced; if net, prepare a conversion schedule confirmed by both parties.
5. Determine the applicable legal framework for each contract based on its signing date (before or after 12/3/2026; the old mixed method or the new framework).
6. Register the foreign contractor tax obligation and choose a per-payment or monthly declaration period (if paying multiple times within a month).
7. On each payment: withhold VAT and CIT before remitting funds to the contractor, pay the tax, and file form 01/NTNN on time.
8. Track cumulative payments against the contract value to detect differences requiring adjustment.
9. At contract end: prepare the foreign contractor tax finalization return (form 02/NTNN or 03/NTNN) if actual tax differs from what was declared and paid.
10. Archive the full dossier — contract, value-allocation appendix, withholding vouchers, declarations, tax payment receipts — at least through the tax inspection statute of limitations.

11. Frequently Asked Questions

Q: Must a foreign construction contractor set up an operating office and register a tax code in Vietnam?

A: Yes, under Article 119 of Decree 175/2024/ND-CP. A foreign contractor must hold a construction operation license, establish an operating office at the project location after the license is issued, and register the operating office's address, seal, bank account, and tax code. The operating office exists only for the duration of the contract and is dissolved when the contract expires.

Q: What foreign contractor tax rates apply to construction work with materials supplied by the contractor?

A: 3% VAT and 2% CIT on taxable revenue, 5% in total on the gross price — per Decree 320/2025/ND-CP, Circular 20/2026/TT-BTC, and Decree 181/2025/ND-CP. For construction without materials supplied by the contractor, VAT is 5% (7% in total with 2% CIT).

Q: How are contracts signed before 12/3/2026 under Circular 103/2014 handled?

A: Under the transitional rules in Circular 20/2026/TT-BTC, contractor and sub-contractor contracts applying the mixed method under Circular 103/2014/TT-BTC that were signed before 12/3/2026 continue to determine CIT obligations under the instruments in force at the time of signing. From 01/7/2026, Circular 103/2014 is fully repealed, and declaration procedures follow Circular 89/2026/TT-BTC.

Q: What obligations does the Vietnamese party have when paying a foreign construction contractor?

A: The Vietnamese party contracting with the foreign contractor must withhold VAT and CIT before payment, pay the tax on the foreign contractor's behalf, and file tax declarations and finalization returns with the tax authority directly managing the Vietnamese party — per Article 30 of Circular 89/2026/TT-BTC.

Q: When must a foreign construction contractor file a foreign contractor tax finalization return?

A: At the end of the contractor contract, if the tax declared and paid differs from the actual tax payable, a finalization return must be filed — per Article 30(2) of Circular 89/2026/TT-BTC. Finalization uses form 02/NTNN (where the Vietnamese party pays on the contractor's behalf) or form 03/NTNN (where the contractor pays directly).

Conclusion: Three Things to Do Before the Next Payment

First, review all ongoing contracts with foreign construction contractors: classify each workstream correctly, determine the right rate (3% or 5% VAT, 2% CIT), and check which contracts are still running under the old Circular 103/2014 framework under the transitional rules. Second, standardize the withholding process before each payment — especially for net-price contracts, which must have a conversion schedule confirmed by both parties, not back-of-the-envelope math. Third, put foreign contractor tax finalization on the project-closure checklist, alongside the construction volume finalization, so there is no reassessment after the contractor has left Vietnam and dissolved its operating office.

Every construction project has a different contract structure — turnkey EPC, general construction contractor, or labor supply only — and the rate classification must be based on the specific contract terms. If your business is preparing to sign a contract with a foreign construction contractor or is facing difficulties with FCT withholding and declaration, FLAT's legal team can review the contract, determine the rate for each workstream, and design a compliance process suited to the new legal framework — contact FLAT Law Firm via hotline 0988424851 for advice on your company's specific case.

References

• 2026 foreign contractor tax rate lookup table (based on Article 7 of Circular 20/2026/TT-BTC; Article 12(3) of Decree 320/2025/ND-CP; Article 9(6)(b) of Circular 69/2025/TT-BTC) — thuvienphapluat.vn
• How to compute 2026 foreign contractor tax under Circulars 20/2026 and 69/2025 — thuvienphapluat.vn
• Removal of CIT rules for foreign contractors in Circular 103/2014/TT-BTC from 12/03/2026 (Circular 20/2026/TT-BTC) — thuvienphapluat.vn
• Circular 89/2026/TT-BTC guiding the Law on Tax Administration and Decree 252/2026/ND-CP (full text, including Article 30 on foreign contractor tax declaration) — thuvienphapluat.vn
• Form 01/NTNN: Foreign contractor tax declaration (Vietnamese party withholding and paying on behalf) — luatvietnam.vn
• Form 02/NTNN: Foreign contractor tax finalization declaration (Vietnamese party withholding and paying on behalf) — luatvietnam.vn
• Form 03/NTNN: Foreign contractor tax declaration (contractor directly paying CIT at a percentage of taxable revenue) — luatvietnam.vn
• When a foreign contractor may carry out construction activities in Vietnam (rights and obligations under Article 119 of Decree 175/2024/ND-CP) — thuvienphapluat.vn

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