Vietnam\’s electronic customs procedures in 2026 did not change all at once — they follow a four-milestone timeline every importer and exporter must remember: 1 February 2026 → 1 July 2026 → 15 October 2026 → 1 March 2027. Each milestone is a new instrument taking effect, adding layers of digitalization, identification and tax-compliance duties — missing one milestone means missing one layer of obligations.
This article walks the timeline, summarizing what businesses must do at each point: from document digitalization, VNeID and supplementary declarations to tax refunds and preparation for the amended Customs Law.
Milestone 1 — 1 February 2026: Circular 121/2025/TT-BCT (document digitalization, VNeID, 60-day supplementary declaration)
Circular 121/2025/TT-BCT of the Ministry of Industry and Trade, effective 1 February 2026, opened the year of customs digitalization with these key contents:
- Document digitalization: accelerated electronic submission and archiving of customs documents, reducing reliance on paper;
- VNeID in customs procedures: electronic VNeID identification integrated into the declaration process to authenticate filers;
- Supplementary declaration within 60 days: businesses may supplement or amend declaration information within 60 days under prescribed conditions — an important \”window\” to self-correct errors before they are discovered through inspection;
- Weekly exchange rates for tax calculation: the exchange rate for import/export duty calculation is published and applied weekly instead of the old mechanism — businesses must use the rate of the correct week of the declaration;
- Value consultation once per 6 months: the customs valuation consultation mechanism is streamlined to once every 6 months for qualifying cases — easing the procedural burden for businesses with regular, stable import/export operations.
Milestone 2 — 1 July 2026: Decree 252/2026 + Circular 86/2026 (implementing the Law on Tax Administration 108/2025)
From 1 July 2026, Decree 252/2026/ND-CP and Circular 86/2026/TT-BTC took effect, guiding implementation of the Law on Tax Administration 108/2025/QH15 in the customs–tax area. Two novelties deserve special attention:
- No prior tax notice before tax assessment: where customs assesses tax (re-determining duty payable due to misdeclaration or insufficient grounds), the procedure of issuing a tax notice before assessment is abolished — businesses receive the assessment decision directly, without the former pre-assessment notice step for explanation. Consequence: declarations must be accurate from the start, because the \”chance to fix things before assessment\” has narrowed;
- Pre-checked refunds within ≤10 working days: for refund cases subject to pre-refund inspection, processing time is cut to no more than 10 working days — improving cash flow for exporters with recurring refund claims.
In parallel, Circular 84/2026/TT-BTC governs VAT refunds for departing tourists (VAT refunds for foreigners and overseas Vietnamese buying goods in Vietnam and carrying them out on departure) — duty-free businesses and refund shops must update procedures under this circular.
Milestone 3 — 15 October 2026: Decree 336/2026 (electronic specialized inspection)
Decree 336/2026/ND-CP, effective 15 October 2026, brings specialized inspection into the digitalization orbit: electronic product identification numbers, VNeID-linked single window, ≤1-hour border processing and a strong shift from pre-inspection to post-inspection. For businesses filing electronic customs declarations, this milestone means: declaration data, product identification numbers and inspection dossiers must match on the electronic system — data mismatches between stages are the main reason consignments get held even after the declaration has cleared.
Milestone 4 — 1 March 2027: Amended Customs Law 11/2026/QH16 (prepare now)
The amended Customs Law 11/2026/QH16 is effective from 1 March 2027 — not yet in force. It includes Article 16a with dedicated rules for goods traded via e-commerce platforms. Cross-border e-commerce businesses should start studying the new framework now: reviewing logistics models, warehousing and declaration processes so systems are ready when the law takes effect — instead of scrambling to adjust in Q1 2027.
Action checklist along the timeline
- Passed (1 Feb 2026): verify the business has fully digitalized documents, integrated VNeID, and correctly applies the 60-day supplementary declaration rule, weekly exchange rates and once-per-6-months value consultation — fix gaps now, as these are already in force;
- In force (1 Jul 2026): review customs–tax declaration processes under the Law on Tax Administration 108/2025 — notably, no more pre-assessment tax notice; update refund procedures to the 10-working-day mark;
- Just effective (15 Oct 2026): synchronize declaration data, product identification numbers and inspection dossiers on the electronic system under Decree 336/2026;
- Prepare (1 Mar 2027): monitor guiding documents for the amended Customs Law, especially Article 16a on e-commerce goods.
Legal bases
- Circular 121/2025/TT-BCT — document digitalization, VNeID, 60-day supplementary declaration, weekly exchange rates, value consultation once per 6 months; effective from 1 February 2026.
- Decree 252/2026/ND-CP and Circular 86/2026/TT-BTC — implementing the Law on Tax Administration 108/2025/QH15: abolition of pre-assessment tax notices, pre-checked refunds within ≤10 working days; effective from 1 July 2026.
- Circular 84/2026/TT-BTC — VAT refunds for departing tourists.
- Decree 336/2026/ND-CP — specialized inspection (electronic product IDs, VNeID single window, ≤1-hour processing, shift to post-inspection); effective from 15 October 2026.
- Amended Customs Law 11/2026/QH16, Article 16a — goods traded via e-commerce platforms; effective from 1 March 2027 (not yet in force).
This article is current as of 14 October 2026. The full title of Decree 252/2026 and specific time limits must be checked against the original texts before application.
Conclusion
E-customs 2026 is a four-milestone timeline: platform digitalization (1 Feb) → new tax framework (1 Jul) → electronic specialized inspection (15 Oct) → amended Customs Law (1 Mar 2027). Businesses that keep pace with each milestone get clean declarations, fast clearance and healthy refund cash flow; those that miss a milestone pay in clearance time, fines and assessment risk. In an environment where the \”chance to correct before assessment\” has narrowed, getting it right the first time is no longer advice — it is a survival requirement.
For reviewing e-customs processes along the 2026–2027 timeline, or handling supplementary declaration, tax assessment or refund issues, contact FLAT Law Firm.
Transparency note: This article was prepared by the FLAW AI Legal Council under FLAT Law Firm\’s internal process; its content is reviewed by the QA Council. It provides general legal information, not advice for any specific matter, and does not replace consultation with a lawyer. Cited instruments reflect their status as of the publication date; readers should verify the original texts before applying them.
