Vietnam Tax Filing Guide 2026

Overview — Vietnam's Tax Filing System

Vietnam operates a self-assessment tax system where taxpayers (individuals and businesses) calculate, declare, and pay their own taxes. The General Department of Taxation (Tổng cục Thuế) administers the system through provincial tax offices. Tax filings are done electronically through the national e-tax portal (thuedientu.gdt.gov.vn) or the HTKK desktop software. The system covers Personal Income Tax (IIT), Corporate Income Tax (CIT), Value-Added Tax (VAT), and other taxes. For employees, IIT is primarily withheld at source by employers, but employees must file an annual finalization (quyết toán thuế) by March 31 of the following year to reconcile their tax liability.

IIT Withholding — Monthly and Quarterly Filings

Employer obligations: Employers are responsible for withholding IIT from employees' salaries based on the progressive tax rates (5-35%). Withholding must be done monthly or quarterly depending on the employer's size:

• Monthly IIT return: Employers must file a monthly IIT return (Tờ khai thuế TNCN, form 05/KK-TNCN) if they have a large number of employees or significant withholding. Due date: 20th of the following month.
• Quarterly IIT return: Smaller employers can file quarterly returns instead of monthly. Due date: 30th day of the first month of the following quarter (e.g., Q1 filing by April 30).
• Tax payment: The withheld IIT must be paid to the tax authority by the same deadlines as the return.
• IIT finalization submission: Employers must also submit the annual IIT finalization return (quyết toán thuế TNCN, form 05/QTT-TNCN) by March 31 of the following year, along with each employee's individual tax finalization.

Self-employed and business individuals: Self-employed individuals must pay IIT through provisional quarterly payments (tạm nộp thuế) and file an annual finalization by March 31. They may also need to pay VAT and license fees.

Annual IIT Finalization — Quyết Toán Thuế (March 31 Deadline)

The annual IIT finalization (quyết toán thuế TNCN) is the process of reconciling your total annual tax liability with the tax withheld throughout the year. Key details:

• Deadline: March 31 of the following year (e.g., 2026 finalization due by March 31, 2027).
• Who must file: All resident individuals with taxable income (unless their employer has finalized on their behalf and they have no additional income). Specifically: (a) employees with income from a single employer — the employer usually finalizes on their behalf; (b) employees with income from multiple sources must self-finalize; (c) self-employed individuals; (d) non-residents with Vietnam-source income.
• Exemptions: Employees with only salary income from a single employer that has finalized on their behalf are not required to self-finalize (unless they want to claim a refund).
• Forms: Form 02/QTT-TNCN (individual taxpayer finalization) or Form 05/QTT-TNCN (employer collective finalization).
• Tax refunds: If excess tax was withheld, the taxpayer can claim a refund through the finalization process. Refunds are processed by the tax authority within 40 days of filing.
• Tax top-up: If insufficient tax was withheld, the taxpayer must pay the difference by the March 31 deadline. Late payment incurs interest at 0.03%/day.

E-Tax Portal (Thuedientu)

The e-tax portal (thuedientu.gdt.gov.vn) is the primary platform for electronic tax filing in Vietnam:

• Registration: Taxpayers (individuals and businesses) must register for an e-tax account using their tax code (MST). Registration requires a digital signature (token or USB token) for businesses, or a personal identification code packaged with the tax code for individuals.
• Filing: Accessible 24/7. You can file all types of tax returns (IIT, CIT, VAT, license tax) electronically. The portal supports online payment via linked bank accounts.
• Tracking: Taxpayers can view their filing history, payment status, pending refunds, and tax debt online.
• Extensions: Extensions for late filing can be requested through the portal in certain circumstances (force majeure).
• Mobile app: The tax authority also provides a mobile app (eTax Mobile) for individuals to view their tax information, receive notifications, and make payments.

HTKK Software (Hỗ Trợ Kê Khai)

HTKK (Hỗ trợ kê khai) is the official desktop software provided by the tax authority for preparing tax returns:

• Function: HTKK is used to fill in tax forms, calculate tax amounts, and generate XML files for electronic submission. It is most commonly used by accountants and businesses.
• Updates: The software is updated regularly (multiple times per year) to reflect changes in tax forms, rates, and regulations. Updates are available for free from the tax authority's website.
• Availability: Available for Windows only. There is no macOS or Linux version. Many accountants run it on a virtual machine or use the web-based e-tax portal instead.
• Forms: HTKK supports all major tax forms including IIT withholding (05/KK-TNCN), IIT finalization (02/QTT-TNCN, 05/QTT-TNCN), CIT provisional (03/TNDN), CIT finalization (04/TNDN), VAT (01/GTGT), and license tax (01/MB).
• Submission: The XML file generated by HTKK can be uploaded to the e-tax portal for submission. Alternatively, some tax offices accept direct submissions through HTKK's built-in submission feature.

Late Filing and Payment Penalties

Vietnam imposes penalties for late filing, late payment, and underpayment of tax:

• Late filing (1-5 days): Warning or written reminder.
• Late filing (6-30 days): Fine of VND 2,000,000 - VND 5,000,000 (for individuals) or VND 5,000,000 - VND 10,000,000 (for businesses).
• Late filing (31-90 days): Fine of VND 5,000,000 - VND 10,000,000 (individuals) or VND 10,000,000 - VND 20,000,000 (businesses).
• Late filing (91+ days): Fine of VND 10,000,000 - VND 25,000,000 (individuals) or VND 20,000,000 - VND 50,000,000 (businesses).
• Late payment interest: 0.03%/day on the overdue amount, calculated from the original due date to the date of payment.
• Tax evasion (criminal): Deliberate underpayment or non-payment of tax can lead to criminal prosecution under the Penal Code (Article 200), with penalties including fines up to VND 4.5 billion and/or imprisonment up to 7 years.

Tax Deductions and Reliefs

Resident individuals can reduce their taxable income through:

• Family circumstances deduction (Giảm trừ gia cảnh): VND 11,000,000/month (VND 132,000,000/year) for the taxpayer, plus VND 4,400,000/month per dependent (up to no limit on the number of dependents). Dependents include children under 18, disabled children, elderly parents without income, and other family members with low income.
• Social insurance contributions (BHXH, BHYT, BHTN): Fully deductible from taxable salary.
• Charitable contributions: Donations to approved charitable organizations are deductible (limited to certain types of contributions).
• Tax exemption: Certain types of income are exempt (e.g., income from inter-family transfers, certain overtime pay, income from personal banking interest VND).

FAQs

What is the deadline for IIT annual finalization in Vietnam?

The deadline for IIT annual finalization (quyết toán thuế) is March 31 of the following calendar year. For the 2026 tax year, the deadline is March 31, 2027. Late filing penalties apply after this date. Extensions are not available for individual tax finalization (only for corporate filings in exceptional circumstances).

Do I need to file if my employer already withheld tax?

If you have only one employer and they correctly withheld taxes for the full year, and they finalize on your behalf (most employers do), you do not need to file separately. However, if you have multiple sources of income, foreign income, or want to claim a tax refund (e.g., for dependents not registered with your employer), you must self-finalize using Form 02/QTT-TNCN.

How do I register for e-tax filing?

Go to thuedientu.gdt.gov.vn and register using your tax code (MST). For individuals, you need your personal tax code and a registered phone number/email. For businesses, you need a digital token (USB token from a certified provider) for electronic signatures. Registration is free. Once registered, you can file returns, make payments, and view your tax history.

What is the difference between HTKK and the e-tax portal?

HTKK is a desktop software (Windows only) used to prepare and calculate tax returns offline. It generates XML files that are then uploaded to the e-tax portal for submission. The e-tax portal is the web-based platform for submission, payment, and tracking. Many accountants use HTKK for complex calculations and the e-tax portal for final submission. For simple filings, the e-tax portal's web forms suffice.

Can I get a tax refund in Vietnam?

Yes. If your total tax withheld during the year exceeds your actual tax liability (due to excess withholding, dependent deductions, or changes in income), you can claim a refund through the annual finalization process. The tax authority is required to process refunds within 40 days of receiving a complete and accurate finalization return. Refunds are paid into your registered bank account.

Disclaimer

This guide provides general information about tax filing procedures in Vietnam for the 2026 tax year. Tax laws, forms, deadlines, and penalties may change. Always consult with a qualified Vietnamese tax advisor or accountant for advice specific to your tax situation. InvestmentKit does not provide tax or legal advice.