After the provincial mergers, more than a few FDI enterprises opened the e-tax system to find their managing tax office replaced by a different regional tax branch, or their registered address standardised to the new administrative map. This article explains the mechanism: most of the update is performed by the tax authority itself, and no filing is required from the enterprise as for an ordinary registration change — but several items still need self-checking to avoid being recorded under the wrong authority and jamming the next filing season.
Applying the Rules
Unlike changes initiated by the enterprise (relocating the head office, changing the name), a change of managing tax office after a provincial merger is a change on the State side. Under Official Letter 1689/CT-NVT, tax authorities reviewed and standardised the entire taxpayer directory to the two-tier map: addresses were updated to the new names, managing offices were reassigned according to locality and the tax sector organisational model, and taxpayers were then notified. The enterprise therefore files nothing for this event alone, and its tax code stays unchanged — a point worth stating plainly, because many accountants still expect a “district transfer” procedure as in the past.
The real risk is not procedural but data-related. First, the standardised address may be written differently from the enterprise registration certificate (dropping the district tier, renaming the ward), and if the e-invoice system is not yet synchronised, the enterprise may issue invoices with two address versions in the same period. Second, an enterprise with business locations or branches across several merged provinces may be assigned a managing office that does not match its head office location or its centralised filing point. Third, files in progress — refunds, inspections, explanations — need a confirmed receiving contact at the new managing office so they are not stalled by the tax sector internal handover.
Where the assignment is wrong, the enterprise should treat it as a data correction before treating it as an administrative complaint: send a review request with the enterprise registration certificate, the tax notice received and evidence of the actual place of operation to both the office currently shown and the office believed competent; ask for the directory to be corrected and confirmed in writing. While the correction is pending, the enterprise must still file and pay on time at the office shown in the system to avoid late-payment consequences — the filing duty does not pause because the managing desk is disputed. Only if the request is not handled, or the tax authority issues a decision based on the wrong office that causes loss, does the matter move to a complaint against an administrative decision under the Law on Complaints.
Beyond the managing office itself, an FDI enterprise should also review: whether the e-tax account and digital signature still match after standardisation; taxpayer information at the bank and the State Treasury office serving tax payments; e-invoice registration and address data in the solution provider system; and locality-based obligations such as contractor tax where a construction site sits, or filings for business locations in other provinces. These items do not synchronise automatically with the tax directory; each depends on the system of the party concerned.
Legal Foundations
- Official Letter 1689/CT-NVT dated 10 June 2025 of the Department of Taxation on reviewing and standardising the taxpayer directory under the two-tier administrative map: the tax authority proactively updates addresses and managing offices in its systems and notifies taxpayers without requiring a change filing.
- Notices of regional tax branches updating taxpayer addresses and managing tax offices after the mergers (implementation practice in merged localities from June 2025) — the basis for the enterprise to explain data changes to counterparties and related authorities.
- Law on Tax Administration 108/2025/QH15 (effective 1 July 2026, replacing Law on Tax Administration 38/2019/QH14): the framework for tax registration, changes to registration particulars and the responsibilities of tax authorities.
- Circular 90/2026/TT-BTC on tax registration (replacing Circular 86/2024/TT-BTC from 1 July 2026) — forms and procedures for registration and changes that do fall within the enterprise notification duty.
- Resolution 202/2025/QH15 dated 12 June 2025 — the boundary change that gives rise to the reassignment of managing tax offices to the new map.
Immediate Next Steps
- Download the update notice of the regional tax branch managing the enterprise and reconcile it with the e-tax system data: address, managing office, operating status.
- Synchronise a single address version across internal records, the e-invoice system and accounting software; keep the tax authority notice as the explanation basis for any difference from the enterprise registration certificate.
- Review tax files in progress (refunds, inspections, explanations) and obtain written confirmation of the receiving contact at the new managing office.
- If assigned to the wrong office, file the directory correction request immediately but keep filing and paying on time at the office shown in the system until the correction is confirmed.
Frequently Asked Questions
When the managing tax authority changes after a provincial merger, must the enterprise notify anyone, and within what time limit?
No filing is required for this event alone. Under Official Letter 1689/CT-NVT dated 10 June 2025, the tax authority proactively updates the address and managing office in the taxpayer directory under the two-tier map and notifies the taxpayer. The enterprise duty is to recheck the data after receiving the notice and report discrepancies. The notification deadlines in Circular 90/2026/TT-BTC apply to registration changes originating from the enterprise itself, not to changes caused by the boundary restructuring.
If the tax authority assigns the wrong managing office, how does the enterprise get it corrected or complain?
Start with a written request for review and directory correction to the office currently managing the enterprise and the office believed competent, attaching the enterprise registration certificate and evidence of the place of operation. While the correction is pending, keep filing and paying on time at the office shown in the system. A complaint under the Law on Complaints is needed only if the request is left unhandled or a decision based on the wrong office harms the enterprise; most real cases close at the data-correction step.
Are the tax code and pending tax filings affected when the managing office changes?
The enterprise tax code does not change — it is a single identifier for the enterprise life. Filing records, debt data and in-progress files are transferred within the tax administration system to the new managing office. The practical risk is delay or misrouting during the handover; the enterprise should obtain written confirmation of the status of open refund and inspection files so nothing is left hanging.
What other tax notification duties should an FDI enterprise review after a provincial merger?
Beyond the managing office: synchronise the address in the e-invoice system and with the solution provider; update information at the bank and the State Treasury serving tax payments; check registrations for each business location and branch in other merged provinces; and review locality-based obligations such as contractor tax filings where a project site is located. None of these systems updates itself from the tax directory, so the enterprise must reconcile each contact point proactively.
This article has been quality-reviewed by the FLAW AI Legal Council