The signing date of a Vietnam M&A deal and the date its legal work is truly finished rarely coincide. After closing, the target often has a new owner, a new legal representative, new charter capital or a new address, and each change triggers a chain of updates at the business registration office, the tax authority, banks and sector regulators. One missed link can freeze invoicing, block account operations or send a licensing file back for correction.
Updates at the business and investment registration offices
The first task is updating the enterprise registration: new members or shareholders, the legal representative, charter capital and the head office address where any of these changed. Law on Enterprises 59/2020/QH14 requires changes to be registered within 10 days of the change occurring, and current procedure follows Decree 168/2025/ND-CP, which replaced Decree 01/2021/ND-CP from 1 July 2025. Filing late not only invites an administrative fine but also delays every procedure that depends on the new enterprise registration certificate.
For foreign-invested targets, an ownership change also reaches the investment registration certificate under Law on Investment 143/2025/QH15, which replaced Law 61/2020/QH14 from 1 March 2026. Where a foreign buyer’s share purchase needs prior capital contribution registration, the correct order is to obtain that approval first, then register the change of members and adjust the investment certificate accordingly.
Tax, invoicing and seal updates
Tax registration data follows the enterprise registration, yet several tax items do not sync automatically and must be checked manually: the notice address, the person in charge of accounting, e-invoice registration, digital signatures and tax payment accounts. From 1 July 2026 tax registration procedure follows Circular 90/2026/TT-BTC, which replaced Circular 86/2024/TT-BTC and changed related tax code forms, so accounting teams should verify the forms in use rather than reusing old templates.
Seals and signatures are the practical bottleneck: the new legal representative must be recognised by banks and counterparties before signing key documents. Companies decide their own seal form and quantity under Law on Enterprises 59/2020/QH14, but they must refresh seal specimens in internal files and re-register signatures and access rights across tax, customs and social insurance systems as soon as the representative changes.
Banking and sub-licence updates
At the bank, the company must notify changes to the legal representative, the account holder and authorised transactors; until the bank accepts the updated file, payment orders signed by the new representative may be refused. For investment capital accounts, terminology and the account regime moved from DICA to ICA under Circular 38/2026/TT-NHNN, which replaced Circular 06/2019/TT-NHNN from 18 August 2026, and post-deal capital or transfer funds must move through the correct account type.
Last comes sub-licences and sector registrations: conditional business licences often attach to conditions about owners, managers or premises, so an ownership change can trigger a duty to notify or to seek fresh approval. Build a separate review list for this group, from retail licences and environmental permits to trademarks and domain names, instead of assuming that the investment registration update alone is enough.
Frequently Asked Questions
After an M&A deal, which registrations must a business update for business, tax and bank accounts?
The mandatory items are: registering changes of members or shareholders, the legal representative and charter capital with the business registration office; adjusting the investment registration certificate where foreign investors are involved; updating tax registration data, e-invoice settings and digital signatures; notifying the bank of the new account holder and signatories; and reviewing every sub-licence tied to ownership conditions. Until each group is done, the deal is not operationally closed.
In what order should post-M&A registration updates be carried out to avoid disrupting operations?
A safe order is: obtain approval for the foreign buyer’s share purchase where prior registration applies, then register the enterprise changes, then adjust the investment registration and update tax records, and only then handle banks, seals, digital signatures and sub-licences. Later steps all rely on the new enterprise registration certificate, so working out of order means refiling documents several times.
What are the statutory deadlines for updating each type of registration after M&A?
Changes to enterprise registration content must be registered within 10 days of the change under Law on Enterprises 59/2020/QH14. Tax and banking updates have no single shared deadline, but in practice they must be finished before the first filing period and the first bank transaction of the new representative, or invoices and payment orders will stall. Sub-licences carry their own notification periods under each sector instrument.
What consequences will a business face if it forgets or delays updating its registrations after M&A?
The most common consequences of a missed update are the bank refusing transactions because the signer is no longer, or not yet, recorded as the legal representative, tax notices going to the old address and recipient, and licence adjustment files being returned because ownership data differs across documents. Late registration of changes also draws administrative fines under the planning and investment penalty decree, rising with the length of the delay.
How to use this checklist
Turn the checklist into a tracker with an owner and a completion date for every item, and lock the sequence from enterprise registration down through tax, banking and sub-licences. An M&A deal is only truly closed when every authority and counterparty has recorded the same new ownership information.
