Unlike many other administrative procedures, corporate income tax incentives in Vietnam operate on a self-assess, self-declare, self-bear-responsibility principle: the enterprise does not “apply” for the incentive at finalisation; it tests its own conditions, records the incentive on the return, and keeps the evidence file to explain when the tax authority inspects. This article explains that mechanism and the risk when incentive conditions are no longer met.
The principle: no prior registration, but the incentive must be provable
Under the Corporate Income Tax Law 67/2025/QH15 (effective 1 October 2025, applying from the 2025 tax period; guided by Decree 320/2025/ND-CP), an investment project in an incentivised sector or location under the law’s catalogue and meeting the specific conditions enjoys preferential rates (10% or 15% for defined terms) and/or time-bound tax holidays and reductions. The enterprise self-determines its category from the investment registration certificate, the investment policy decision and the project’s actual implementation — there is no separate incentive registration or approval procedure at the tax authority before filing. The flip side of self-assessment is the burden of proof: on audit, the tax authority tests actual conditions (progress, scale, actual business lines, conditions recorded in investment documents) against the incentive declared; whatever cannot be proven is disallowed.
How is the incentive declared on the finalisation return?
At annual finalisation, the incentive is presented on appendix 03-3A/TNDN attached to return 03/TNDN: the enterprise separately determines income from incentivised and non-incentivised activities (allocating revenue and costs under the rules where accounting is combined), applies the preferential rate to qualifying income, computes the tax exempted/reduced in the period and the amount still payable. Three technical points commonly cause errors: (1) income from activities outside the incentivised project (deposit interest, exchange gains, asset transfers…) does not automatically follow the project’s incentive — it must be separated under the other-income rules; (2) the holiday/reduction clock starts from the first year the project has taxable income (if there is no taxable income in the first three years, from the fourth year with revenue); (3) where a project has multiple phases/locations, each part’s conditions must be matched to its corresponding investment documents.
What does the incentive evidence file contain?
- Project legal group: the investment registration certificate/policy approval (and amendments) stating sector, location and scale — the basis for placing the project in the incentive catalogue.
- Actual implementation group: evidence the project operates in the registered sector and location: land/factory leases in the incentivised location, construction permits, acceptance records, actual labour and asset files at the project site.
- Specific conditions group: proof of the conditions attached to the incentive type (e.g. capital scale, technology, product ratios, headcount) under the investment documents and the Corporate Income Tax Law 67/2025/QH15 with Decree 320/2025/ND-CP.
- Accounting group: books and allocation schedules of revenue — costs between incentivised and non-incentivised activities, being the basis of the figures on appendix 03-3A/TNDN.
What if the project no longer meets the conditions mid-incentive?
Consequences follow the degree: incentives enjoyed without meeting conditions are clawed back to the standard rate, with 0.03% per day late payment interest from the relevant period’s deadline; if the incorrect incentive declaration is treated as an incorrect declaration causing a tax shortfall, a 20% fine on the additional tax applies under Article 16 of Decree 125/2020/ND-CP (and more for evasion indicators). Common real-world cases: the project’s actual business lines change away from the registration, the site moves out of the incentivised location, or scale conditions are not met at the testing point — the enterprise should self-adjust as soon as conditions change rather than wait to be found, because self-adjustment before audit avoids the incorrect-declaration fine layer (see topic FDI-LC-2045).
Frequently asked questions
How is a tax-incentivised project declared on the finalisation return?
The enterprise self-determines income from the incentivised activity and declares it on appendix 03-3A/TNDN with return 03/TNDN: separating incentivised and non-incentivised income, applying the preferential rate, and computing the exempted/reduced tax and the amount still payable. Incentives run on self-assessment — self-declaration — self-responsibility under the Corporate Income Tax Law 67/2025/QH15.
What evidence proves the incentive conditions are met?
Four groups: project legality (investment registration certificate stating the incentivised sector and location); actual implementation at the location; proof of the specific conditions of the incentive type; and accounting allocation of revenue — costs between the two activity groups.
What happens if the project no longer meets the conditions while enjoying incentives?
The undue incentive is clawed back to the standard rate with 0.03% per day interest, plus a 20% fine on the additional tax if treated as an incorrect declaration (Article 16 of Decree 125/2020/ND-CP). Examples: actual sector/location changed away from the incentivised registration.
Do tax holidays apply automatically or must they be registered?
There is no separate incentive registration/approval at the tax authority: the enterprise self-determines conditions under the Corporate Income Tax Law 67/2025/QH15 and its investment documents, self-declares on appendix 03-3A/TNDN and keeps the evidence file. “Automatic” in the sense of self-application when conditions are met — but always subject to inspection and clawback if unproven.
This article has been quality-reviewed by the FLAW AI Legal Council
