Electronic tax filing in Vietnam is not a future trend — for enterprises it has been operating reality for years. What changes with Tax Administration Law 108/2025/QH15, effective 1 July 2026, is the legal status of the electronic channel: from an encouraged option to the default method for all tax transactions, with paper files becoming an exception needing justification. FDI enterprises should view this roadmap together with cash-register e-invoices and new data standards as one overall conversion programme, not an accounting department side task.
Who is in scope and the roadmap from 2026
Operating enterprises are already within electronic filing through the tax authority’s system with digital signatures — in practice this duty already covers nearly all enterprises, and Tax Administration Law 108/2025/QH15 consolidates the electronic-transaction principle for every procedure: tax registration, declaration, payment, refunds and information exchange with the tax authority. The still-expanding part of the roadmap covers groups previously on paper or separate channels: household and individual businesses in the scope of cash-register-initiated e-invoices under Decree 70/2025/ND-CP amending Decree 123/2020/ND-CP, and specialised procedures being digitised in waves.
For FDI enterprises, the point of attention is not monthly or quarterly returns — already electronic — but transactions still running on paper processes internally: paper contractor tax withholding documents, treaty application files submitted in person, and explanation exchanges by official letter. As the tax authority moves these procedures onto the electronic environment under the Law 108/2025 roadmap, enterprises keeping paper processes will have to convert at short notice under filing-deadline pressure.
Sanctions for non-conversion or late filing on the electronic channel
There is no standalone sanction named “failure to digitalise”, but equivalent legal consequences arrive from three directions: a file submitted through the wrong channel or in the wrong format is treated as not filed on time, attracting late-filing penalties under Decree 125/2020/ND-CP that scale with the delay; late-paid tax bears late-payment interest of 0.03 percent per day under the Tax Administration Law; and invoices issued off the electronic standard (wrong format, data not transmitted as prescribed) can be treated as invalid invoices, costing the buyer its input VAT credit — a commercial consequence far heavier than the fine.
The risk level therefore lies in continuity: a system incident on the deadline day (an expired digital signature, a congested portal, a wrong format version) immediately becomes late filing for that entire period. Enterprises need operational buffers: a digital-signature renewal calendar, a rule of filing important returns at least one working day early, and a fallback filing channel through a tax agent or an authorised service provider.
Data standards, formats and choosing a service provider
The core technical standards comprise: returns in XML data format to the tax authority’s specification (form versions change by period and must be updated in the software); a valid organisational digital signature attached to the representative or authorised signer; e-invoices to the data standard of Decree 123/2020/ND-CP and its amendments, transmitting data to the tax authority by the registered method; and electronic archiving of tax documents for the statutory period with retrievability on inspection.
Criteria for choosing an e-tax and e-invoice service provider for an FDI enterprise: speed of form updates when the tax authority changes versions (the single most important criterion, because one period of slow updating is one period of late filing); integration with the group’s ERP and accounting system rather than double manual entry; bilingual support and reporting for the parent; service-level commitments on incident recovery on deadline days; and a full data export policy on contract termination so the enterprise is never locked out of its own tax data.
Frequently Asked Questions
1. Who must file electronically from 2026?
Operating enterprises are already in comprehensive e-filing with digital signatures in practice, and Tax Administration Law 108/2025/QH15 (effective 1 July 2026) consolidates electronic transactions as the default for registration, declaration, payment and refunds. The groups still on the expansion roadmap are household and individual businesses in the cash-register e-invoice scope under Decree 70/2025/ND-CP and remaining procedures being digitised in waves.
2. What are the sanctions for enterprises that do not convert digitally?
Sanctions arrive indirectly but really: wrong-channel or wrong-format files are treated as late filings and penalised under Decree 125/2020/ND-CP at levels rising with the delay; late-paid tax bears 0.03 percent per day; and off-standard e-invoices risk invalidity, costing buyers their VAT credit. Enterprises need operational buffers: on-time signature renewal and filing before the deadline day.
3. What are the new data standards and e-return formats?
Core standards: returns in XML format to the tax authority’s specification with updated form versions; a valid organisational digital signature; e-invoices to the data standard of Decree 123/2020/ND-CP and its amendments, transmitted by the registered method; and electronic archiving of tax records for the statutory period, retrievable on inspection.
4. By what criteria should an FDI enterprise choose an e-tax service provider?
In priority order: speed of form-version updates following the tax authority; ERP and group accounting integration; bilingual support and headquarters reporting; incident-recovery commitments on deadline days; and a full data hand-back clause on contract end. Service price should rank below these criteria, because one late-filing period costs more than years of service fees.
This article has been quality-reviewed by the FLAW AI Legal Council