For foreign-invested enterprises in Vietnam, the difference between smooth compliance and costly penalties often comes down to one thing: hitting deadlines. Late filings trigger fines even when the tax itself is calculated correctly. This article lays out the key recurring tax and reporting deadlines that FDI companies should plan around in 2026, so nothing slips through the cracks.
The monthly rhythm
Most FDI enterprises with monthly filing status must declare and pay value-added tax (VAT), foreign contractor tax (FCT), and personal income tax (PIT) withheld from employees. The standard monthly deadline is the 20th of the following month. For companies on quarterly VAT filing, the VAT return is due by the last day of the first month of the next quarter.
Because the monthly 20th deadline recurs all year, the most common cause of penalties is simply losing track during busy operating periods. A managed filing calendar removes that risk.
The big annual deadlines
Two finalizations dominate the first quarter of the year:
- Annual CIT finalization is due within 90 days of the fiscal year-end. For companies on a standard calendar year, that places the deadline at the end of March.
- Annual PIT finalization also falls in the same window, typically late March, for income paid in the prior year.
March is therefore the most compliance-intensive month for FIEs in Vietnam, with tax finalization, investment reporting, and foreign loan disclosures all converging. April often serves as a final adjustment window for delayed or revised submissions.
Beyond tax: investment and statistical reporting
Tax is only part of the picture. FDI companies operating under investment licenses must also submit periodic reports to investment authorities and statistical offices, covering project implementation, capital contribution, labor usage, and financial performance. Enterprises with offshore loans must report borrowing and repayment status to the State Bank of Vietnam. These obligations are essential for keeping your Investment Registration Certificate in good standing.
Two changes to note for 2026
First, paper-based tax filings are no longer accepted for FDI enterprises from March 2026 — fully electronic filing is now required, so your accounting, invoicing, and reporting systems need to be synchronized. Second, the tax authority now uses a risk-based, AI-supported audit scoring model, which makes consistent and well-documented records more important than ever.
Penalties for missing deadlines
Late or incorrect filing is penalized under Decree 125/2020, and late payment interest accrues at roughly 0.03% per day under the Tax Administration Law. Over a full year, small slips add up — and repeated lateness can raise your audit risk profile.
Stay ahead with a managed calendar
The practical takeaway for every foreign-invested business is consistent: know the current rules, keep your financial data organized, and never miss a deadline. The cleanest way to guarantee that is to hand the calendar to a team that monitors it for you.
At TrustlineAX Advisory, we manage the full compliance calendar for FDI companies — monthly VAT, FCT, and PIT filings, quarterly CIT payments, annual finalizations, and investment and statistical reporting — so your deadlines are met automatically and your records stay audit-ready.
Want a worry-free compliance calendar for 2026? Contact us for a free 30-minute consultation.
This article is for general information and reflects the framework as of 2026. Deadlines can shift with public holidays and regulatory updates; please confirm specific dates with a qualified advisor.