Vietnam has introduced one of the most investor-friendly corporate tax reforms in Southeast Asia. A regulatory development confirmed on June 11, 2026, changes the tax planning calculus for every newly established foreign-invested enterprise in the country.
Official Letter 3896/CT-CS, issued by the Department of Taxation, confirmed that qualifying foreign-invested enterprises (FIEs) may access the 3-year full Corporate Income Tax exemption under Decree No. 20/2026/ND-CP. This reversal overturned Official Letter 2169/CTPHCM-QLDN3 (March 2026), which had excluded FDI companies from the policy on the basis that it was designed for the domestic private economic sector.
The implication is significant. Foreign companies that established Vietnamese operations in 2025 or early 2026 without factoring this exemption into their CIT planning may have filed provisional tax payments incorrectly, and may have grounds for retrospective adjustment.
The Policy Foundation: Resolution 198 and Decree 20
Resolution 198/2025/QH15 and the Private Sector Reform Agenda
Resolution No. 198/2025/QH15 is the National Assembly’s foundational policy document on private sector development, one of the most ambitious reform commitments in Vietnam’s recent economic history. The resolution introduced a suite of tax incentives designed to accelerate enterprise formation, reduce the financial burden on early-stage businesses, and grow Vietnam’s corporate tax base through volume rather than rate.
Decree No. 20/2026/ND-CP, effective January 15, 2026, implements Resolution 198’s tax provisions. Its overarching aim is to unlock growth, ease financial pressure on emerging businesses, and accelerate private sector contributions to national economic competitiveness. The CIT exemption framework under Decree 20 is the most immediately valuable provision for foreign investors evaluating market entry into Vietnam.
Although Decree 20 took effect on January 15, 2026, the specific tax incentives apply retrospectively from the 2025 tax year. This backdating creates a planning opportunity, and a compliance obligation, for FDI companies that were already operating in Vietnam when Decree 20 was enacted.
What the 3-Year CIT Exemption Provides
Newly established SMEs are entitled to a full Corporate Income Tax exemption for three years from the date of first Enterprise Registration Certificate (ERC) issuance. The exemption period runs continuously, it does not pause or reset when revenue arises or when the enterprise first generates taxable income.
This is structurally different from the standard CIT holiday under Decree 96/2026 and Law 67/2025/QH15, where the exemption period begins from the first year of taxable income (not ERC issuance). For companies in capital-intensive early phases with delayed profitability, the Decree 20 zero-rate framework provides a fixed, date-certain exemption window.
Which FDI Companies Qualify: The SME Threshold Analysis
The Revenue, Headcount, and Capital Criteria
Qualification for the 3-year CIT exemption requires the FDI enterprise to meet Vietnam’s SME classification criteria under applicable regulations. The general SME thresholds under Vietnamese law operate on a sector-tiered basis: micro enterprises have a maximum of 10 employees and annual revenue not exceeding VND 3 billion in non-commercial activities; small enterprises employ up to 200 people with revenue not exceeding VND 50 billion; and medium enterprises employ up to 300 people with revenue not exceeding VND 200 billion, with specific thresholds varying by sector.
Meeting the SME thresholds alone is not sufficient. The enterprise must also be newly established and satisfy all conditions under Resolution 198/2025/QH15 and Decree 20/2026/ND-CP simultaneously.
The FDI Disqualification Risk Most Companies Face
TrustlineAX Advisory, which produces one of the most technically rigorous FDI CIT guides in Vietnam, identifies the key practical constraint: most foreign-invested enterprises operating in Vietnam have total revenue exceeding VND 50 billion, or are subsidiaries of foreign parent companies. Both conditions disqualify the enterprise from SME classification under the current regulatory framework.
This means the Decree 20 zero-CIT framework is not universally accessible to FDI companies. It applies specifically to newly established foreign-invested enterprises in their early operational years, before revenue scales beyond the SME ceiling. For venture-backed startups, newly formed joint ventures, newly established regional offices, and FDI companies entering Vietnam with a phased investment approach, the eligibility window exists, but requires deliberate planning to capture.
The Eligibility Checklist
The following sequential assessment determines whether a foreign-invested enterprise can access the 3-year CIT exemption.
Step 1, Verify SME classification: Confirm that the enterprise’s annual revenue, headcount, and capital fall within the applicable SME thresholds for the relevant sector. Revenue is the most commonly breached threshold for FDI companies.
Step 2, Confirm newly-established status: The enterprise must be genuinely newly established. The exemption is not available to enterprises formed via mergers, consolidations, divisions, separations, ownership transfers, or changes in business form, regardless of SME classification.
Step 3, Review Legal Representative history: Restrictions apply to Legal Representatives with equity involvement in an enterprise dissolved within the previous 12 months. This condition requires careful due diligence on the corporate history of any individual designated as Legal Representative.
Step 4, Assess income exclusions: Income categories specified in Clause 3, Article 18 of Law 67/2025/QH15 are excluded from the exemption even where the enterprise otherwise qualifies. These income exclusions must be identified and separated from the enterprise’s total income before applying the zero-rate.
Step 5, Document innovative enterprise status (if applicable): Decree 20 extends CIT incentives to innovative enterprises and science/technology enterprises beyond the basic SME framework. Tech-focused FDI companies in AI, semiconductor, and R&D sectors should assess whether innovative enterprise designation provides an additional or alternative eligibility pathway.
Decree 20 vs Standard CIT Holiday: Choosing the Optimal Framework
Two Routes to Zero CIT, With Material Differences
FDI investors establishing new operations in Vietnam now face a strategic choice between two distinct zero-CIT frameworks.
The Decree 20 3-year exemption provides a fixed zero-CIT period from ERC issuance regardless of profitability, requires SME classification, and is available to a narrower pool of FDI enterprises, primarily those with limited initial revenue. It does not require sector qualification, location in a special zone, or minimum investment scale. The exemption period starts immediately.
The standard CIT holiday under Decree 96/2026 and Law 67/2025 provides a 4-year full exemption plus a 9-year 50% CIT reduction for qualifying high-tech and sector-priority projects, applied at a preferential 10% rate for 15 years. This framework requires sector qualification (semiconductor, AI, high-tech, green energy) or location in designated difficult areas or special economic zones. The exemption clock starts from the first year of taxable income, not ERC issuance. Industrial zone location alone no longer qualifies.
For an FDI company qualifying for both, the standard CIT holiday framework typically generates greater total tax savings over a longer period, particularly for capital-intensive projects with delayed profitability. The Decree 20 zero-rate is most advantageous for service-oriented or asset-light FDI companies with early revenue generation that do not qualify for sector-based incentives.
The Global Minimum Tax Overlay
Both frameworks are subject to an important constraint for large multinationals. MNE groups with consolidated global revenue at or above EUR 750 million are subject to Vietnam’s Qualified Domestic Minimum Top-Up Tax (QDMTT) under Decree 236/2025/ND-CP. Where the effective tax rate on a Vietnamese entity falls below 15% due to a CIT exemption, a top-up tax brings the ETR to 15%. The zero-rate value of both the Decree 20 exemption and the standard CIT holiday is capped at a 15-percentage-point saving from the 20% standard rate for in-scope MNEs.
The Retrospective Adjustment Window: FY2025 CIT Filings
What FDI Companies That Filed Without the Exemption Should Do Now
Decree 20’s tax incentives apply from the 2025 tax year. Official Letter 3896 was only issued on June 11, 2026. FDI companies that filed FY2025 quarterly CIT provisional payments without accounting for the 3-year exemption may have over-paid.
The correct approach is a formal review of the corporate structure and operating history against the statutory criteria of Decree 20/2026/ND-CP and Official Letter 3896/CT-CS. Where the enterprise qualifies, a review of whether adjustments are available through the annual CIT finalization return should be conducted before the finalization deadline. This review should be undertaken by qualified tax advisors with current knowledge of the Department of Taxation’s evolving guidance on this specific issue.
A formal corporate structure assessment, covering SME thresholds, income exclusion categories, Legal Representative history, and formation method, is the prerequisite for any CIT adjustment filing.
Innovative Enterprise Provisions: The Tech Startup Angle
Beyond SMEs: How Innovative Enterprises Access Zero-Rate CIT
Decree 20 also extends CIT incentives to innovative enterprises and science/technology enterprises. This provision expands the zero-rate framework beyond the basic SME classification and is directly relevant to tech-focused FDI companies in artificial intelligence, semiconductor design, R&D centres, and digital platform businesses.
The innovative enterprise pathway does not require the same revenue and headcount thresholds as standard SME classification. It requires certification that the enterprise meets the applicable innovation criteria under Vietnam’s science and technology law framework. For FDI companies in Decree 96/2026’s priority sectors, semiconductors, AI, green energy, and high-tech R&D, the innovative enterprise pathway may provide an accessible route to zero-CIT status even when the standard SME revenue thresholds are exceeded.
Documentation requirements for innovative enterprise status typically involve certification from the Ministry of Science and Technology or the relevant sector authority. This should be initiated at company formation, not retroactively after operations commence.
How Viettonkin Supports FDI Companies with CIT Zero-Rate Planning
For FDI investors evaluating the CIT elimination policy under Decree 20 and Official Letter 3896, and for companies that may have over-filed 2025 provisional CIT payments, on-the-ground advisory expertise significantly reduces both the compliance risk and the opportunity cost of unassessed eligibility. Viettonkin’s Vietnam tax and compliance services cover Decree 20 eligibility assessment, SME threshold analysis by sector, innovative enterprise certification support, CIT exemption documentation, FY2025 retrospective adjustment review, and annual CIT finalization management for foreign-invested enterprises across all sectors.
Frequently Asked Questions
Can FDI Companies Access Vietnam’s 3-Year CIT Exemption Under Decree 20?
Yes, as confirmed by Official Letter 3896/CT-CS (June 11, 2026). Qualifying FDI enterprises that meet SME criteria under applicable regulations and satisfy all conditions of Resolution 198/2025/QH15 and Decree 20/2026/ND-CP may access the 3-year full CIT exemption from ERC issuance date.
Which FDI Companies Are Most Likely to Qualify?
Newly established FDI companies with annual revenue below the applicable SME ceiling, that are not subsidiaries of large foreign parent companies, and that were not formed via merger, division, or separation. Innovative enterprise status under Vietnam’s science and technology law provides an additional eligibility pathway for tech-focused FDI companies.
Does the Decree 20 CIT Exemption Apply from FY2025?
Yes. Decree 20 incentives apply retrospectively from the 2025 tax year. FDI companies that did not account for this exemption in FY2025 provisional CIT payments should conduct a formal review of whether adjustment filings are available through the annual CIT finalization process.
