Why Vietnam Annual Compliance Gets Complicated {why-complicated}
Vietnam operates a multi-agency compliance framework. Your obligations flow to at least four bodies:
- General Department of Taxation (GDT) CIT, VAT, PIT, FCT, e-invoicing
- Vietnam Social Security (VSS) social, health, and unemployment insurance
- Department of Planning & Investment (DPI) annual enterprise report, investment activity report
- State Bank of Vietnam (SBV) foreign loan registration, profit remittance reporting
The tax year runs January 1 – December 31, and most filings use the Gregorian calendar. However, the DPI annual report uses a fiscal-year logic tied to your enterprise registration, and VSS contribution cycles are monthly making the total compliance burden feel relentless without a structured calendar.
Corporate Income Tax (CIT) Annual Return & the 80% Rule {cit}
Standard CIT Rate
The standard CIT rate in Vietnam is 20% of taxable profit. Preferential rates of 10% or 17% apply to qualifying industries (technology, education, healthcare) and geographic incentive zones (industrial parks, economic zones).
Annual CIT Return: Due March 31
The CIT annual finalisation return (Tờ khai quyết toán thuế TNDN) must be submitted no later than the last day of the 3rd month following the fiscal year-end for calendar-year companies, that is March 31.
Along with the return, you must submit:
- Audited or reviewed financial statements
- Appendices on revenue, deductible expenses, and tax incentives (Phụ lục 03-1A/TNDN through 03-6/TNDN as applicable)
- Transfer pricing declaration forms (if applicable see Section 8)
Any tax balance due must also be paid by March 31. Late payment triggers interest from April 1.
Quarterly Provisional CIT The Critical 80% Rule
This is where many companies create unintended liability. Under Circular 80/2021/TT-BTC, companies must pay provisional CIT quarterly (Q1 by April 30, Q2 by July 31, Q3 by October 31, Q4 by January 31). There is no mandatory quarterly declaration form you calculate and pay based on your estimated liability.
The 80% Rule (critical): The sum of your four quarterly provisional payments must equal at least 80% of your actual CIT liability as shown on the annual finalisation return.
If total provisional payments fall below 80% of the final liability, late-payment interest of 0.03% per day is charged on the shortfall backdated to the Q4 payment deadline (January 31), not from March 31. This catches companies off guard every year.
Practical implication: If your Q4 results are significantly better than Q1–Q3, you must “top up” your Q4 provisional payment by January 31, even if the annual return isn’t due until March 31.
Value Added Tax (VAT) Monthly vs. Quarterly Filing {vat}
Who Files Monthly vs. Quarterly?
| Filing Frequency | Trigger |
|---|---|
| Monthly | Prior-year revenue ≥ VND 50 billion (~USD 2 million) |
| Quarterly | Prior-year revenue < VND 50 billion, or new enterprise in first year |
- Monthly VAT returns are due by the 20th of the following month
- Quarterly VAT returns are due by the last day of the month following the quarter-end (e.g., Q1 return due April 30)
Standard VAT Rates (2026)
- 10% standard rate for most goods and services
- 5% essential goods (clean water, agricultural inputs, medical equipment, educational materials)
- 0% exports of goods and services, international transport
Input VAT Refund
VAT refunds are available where input VAT continuously exceeds output VAT for 12 consecutive months, or for exporters with input VAT on exported goods/services exceeding VND 300 million. Refund processing typically takes 40 business days for standard cases and 6 business days for fast-track (low-risk) cases though practical timelines are often longer.
E-Invoicing: Mandatory, Not Optional {einvoicing}
Vietnam’s e-invoicing mandate under Decree 123/2020/ND-CP and Circular 78/2021/TT-BTC is fully in force. Since July 1, 2022 (extended rollout completed by end-2022), all enterprises must issue authenticated electronic invoices (hóa đơn điện tử). Paper invoices are no longer valid for new transactions.
Two Types of E-Invoices
- E-invoices with the Tax Authority Code (mã của cơ quan thuế) generated by the taxpayer, authenticated in real-time by the GDT portal before being sent to the buyer. Required for most businesses.
- E-invoices without the Tax Authority Code available only for large enterprises meeting specific criteria (typically high-volume B2B transactions with GDT approval).
Key E-Invoicing Compliance Points
- Registration: All businesses must register with the GDT’s e-invoice portal (einvoice.gdt.gov.vn) and connect through a certified e-invoice service provider.
- Format: Invoices must comply with XML format standards set by the GDT.
- Storage: E-invoices must be stored digitally for a minimum of 10 years.
- Cancellation/Adjustment: Erroneous e-invoices cannot simply be deleted a formal adjustment invoice (hóa đơn điều chỉnh) or replacement invoice must be issued with GDT notification.
- Penalties for non-compliance: Issuing paper invoices or non-authenticated e-invoices can result in fines of VND 10–20 million per violation, plus denial of input VAT credit for the buyer.
Action item: If your accounting software is not yet integrated with a GDT-approved e-invoice provider, this is your most urgent compliance fix.
Social Insurance, Health Insurance & Unemployment Insurance {si}
Employer contributions to Vietnam’s statutory insurance schemes are among the highest in Southeast Asia. Understanding the combined employer rate of approximately 21.5% is essential for accurate payroll budgeting.
Contribution Rates (2026)
| Fund | Employer Rate | Employee Rate |
|---|---|---|
| Social Insurance (SI) | 17.5% | 8% |
| Health Insurance (HI) | 3% | 1.5% |
| Unemployment Insurance (UI) | 1% | 1% |
| Total | 21.5% | 10.5% |
Rates apply to the employee’s monthly salary, capped at 20 times the base salary for SI/HI (base salary currently VND 2,340,000/month cap ~VND 46.8 million/month) and 20 times the regional minimum wage for UI.
Monthly Filing & Payment Deadlines
- Contributions must be declared and paid by the last day of each month to Vietnam Social Security (VSS).
- New hires must be enrolled within 30 days of their start date.
- Annual reconciliation of the insurance register with actual payroll is required and subject to VSS inspection.
Common Compliance Traps
- Underreporting salary basis: Some companies only report base salary and exclude allowances. VSS defines the contribution salary broadly most fixed monthly allowances are included unless explicitly excluded (e.g., meal allowances, transport allowances with specific caps).
- Foreign employees: Mandatory SI/HI/UI contributions apply to foreign employees holding a Vietnamese work permit, except where a bilateral social security agreement exempts them (Vietnam has limited such agreements).
- Late enrollment: Failure to enrol employees on time exposes the company to backdated contributions plus penalty interest.
Personal Income Tax (PIT) Withholding & Annual Finalisation {pit}
Employers act as withholding agents for PIT on employment income.
- Monthly PIT withholding returns are due by the 20th of the following month (for monthly VAT filers) or quarterly for quarterly VAT filers.
- Annual PIT finalisation (Quyết toán thuế TNCN) employers must submit the annual PIT return by March 31 (same as CIT). This return reconciles all withholding against actual employee tax liability and handles any refunds or underpayments.
- Individuals with multiple income sources or those who do not authorise employer finalisation must file their own annual PIT return by April 30.
PIT on employment income uses progressive rates from 5% to 35% for tax residents. Non-residents pay a flat 20% on Vietnam-sourced income.
DPI Annual Report The Deadline Most Companies Miss {#dpi}
Foreign-invested enterprises (FIEs) and domestic companies with investment projects must file an annual enterprise/investment activity report with the Department of Planning and Investment (DPI).
Deadlines
- Annual enterprise report: Due March 31 of the following year (reporting period January 1 – December 31)
- Investment activity report (Báo cáo hoạt động đầu tư): Also due March 31, submitted via the National Investment Information System (NIIS) portal
What the DPI Report Covers
- Revenue, profit, number of employees
- Investment capital actually utilised vs. committed
- Key operational developments
- Environmental and labour compliance declarations
Why Companies Miss It
The DPI report is separate from all GDT filings and goes to a different agency portal. Many SMEs and even some large FIEs conflate it with their tax finalisation and assume filing with the GDT satisfies everything. It does not.
Penalties for failure to submit the DPI annual report range from VND 10–20 million, and repeated non-compliance can affect investment certificate renewals and expansion approvals.
Transfer Pricing Documentation {tp}
Vietnam’s transfer pricing rules are set out in Decree 132/2020/ND-CP, which took effect from December 2020 and aligns closely with OECD guidelines.
Who Must Comply
Any company with related-party transactions (giao dịch liên kết) including inter-company loans, management fees, royalties, or goods/services transactions with affiliates is subject to transfer pricing obligations.
Documentation Requirements
- Master File (Hồ sơ tập đoàn) group-level information on the multinational’s business, value chain, and TP policies
- Local File (Hồ sơ người nộp thuế) entity-level analysis of related-party transactions and arm’s-length benchmarking
- Country-by-Country Report (CbCR) required for Vietnamese entities that are the ultimate parent of a group with consolidated revenue ≥ VND 18 trillion (~USD 720 million), or local entities of foreign groups required to file CbCR in their home jurisdiction
Key Deadlines
- TP Declaration (Phụ lục I–IV, Decree 132): Filed with the annual CIT return by March 31
- TP Documentation package: Must be prepared before the CIT filing date and retained for 10 years it does not need to be submitted proactively but must be produced within 15 working days of a GDT request
Safe Harbour Exemption
Companies are exempt from full documentation (but not from the TP declaration form) if they meet all three conditions: (1) revenue below VND 50 billion, (2) related-party transaction value below VND 30 billion, and (3) they engage no related-party transactions involving tax havens.
Foreign Contractor Tax (FCT) Withholding {fct}
When a Vietnamese company (or FIE) pays a foreign entity for services performed in Vietnam or services used in Vietnam, Foreign Contractor Tax (FCT) must be withheld.
FCT is a composite of:
- VAT component (typically 5% on the gross contract value for services, though rates vary by service type)
- CIT component (typically 5% for services, higher for certain sectors e.g., 10% for royalties, 2% for goods with associated installation)
The withholding company files and remits FCT within 10 days of payment to the foreign contractor. Failure to withhold makes the Vietnamese company liable for the unpaid FCT plus penalties.
Common triggers: software licences, management fees paid to parent companies, consulting fees, technical assistance fees, and lease payments on equipment brought in by foreign contractors.
Statutory Audit Requirements {audit}
The following entities are required by law to have their financial statements audited annually:
- All foreign-invested enterprises (FIEs)
- Enterprises in which the state holds capital
- Public companies and listed entities
- Credit institutions, insurance companies, and securities firms
- Enterprises whose audited financial statements are required by law (e.g., for equitisation)
Deadline: Audited financial statements must be completed and signed before the CIT annual return is filed i.e., by March 31. In practice, engaging your auditor in October–November for a December year-end is strongly recommended.
Audits must be conducted by a registered audit firm on the MOF’s approved list. Individual CPA firms not on this list cannot issue legally valid audit reports in Vietnam.
Penalties, Late-Payment Interest & How the GDT Calculates Them {penalties}
Vietnam’s penalty framework is set out in Decree 125/2020/ND-CP (as amended). Understanding it helps you prioritise where to focus compliance energy.
Late-Payment Interest
- 0.03% per day on unpaid tax or short-paid tax
- Applied from the day after the payment deadline to the date of actual payment
- Calculated on the principal only (interest is not compounded)
- Example: VND 500 million CIT shortfall for 60 days = VND 9 million in interest
Administrative Penalties for Late Filing
| Delay | Penalty Range |
|---|---|
| 1–30 days late | VND 2–5 million (warning possible for first offence) |
| 31–60 days late | VND 5–8 million |
| 61–90 days late | VND 8–15 million |
| 91+ days or failure to file | VND 15–25 million + potential criminal referral for large evasion |
Penalties for Underreporting Tax
- 20% of the understated tax amount if the error was not due to fraudulent intent
- 1–3 times the understated tax amount if tax evasion is established
Penalties for E-Invoice Violations
- VND 10–20 million for issuing non-compliant invoices
- VND 20–50 million for obstructing tax inspection
GDT Audit Triggers (What to Watch)
The GDT uses a risk-scoring model that flags companies for desk audit or field audit based on:
- Revenue growth inconsistent with tax payments
- Persistent VAT refund claims
- Related-party transactions without transfer pricing documentation
- Low effective CIT rate relative to industry peers
- Employee headcount growth inconsistent with SI contributions
Vietnam Compliance Calendar 2026 Key Deadlines at a Glance {#calendar}
| Deadline | Obligation | Agency |
|---|---|---|
| January 20 | Monthly VAT return (November) | GDT |
| January 31 | Q4 provisional CIT payment | GDT |
| January 31 | Q4 PIT withholding return (quarterly filers) | GDT |
| Last day of January | Monthly SI/HI/UI contributions (December) | VSS |
| February 20 | Monthly VAT return (January) | GDT |
| March 20 | Monthly VAT return (February) | GDT |
| March 31 | CIT annual finalisation return + payment | GDT |
| March 31 | PIT annual finalisation return (employers) | GDT |
| March 31 | DPI annual enterprise report | DPI |
| March 31 | DPI investment activity report (FIEs) | DPI |
| March 31 | Transfer pricing declaration (with CIT return) | GDT |
| April 30 | Q1 provisional CIT payment | GDT |
| April 30 | Q1 VAT return (quarterly filers) | GDT |
| April 30 | Individual PIT annual finalisation (self-filers) | GDT |
| July 31 | Q2 provisional CIT payment | GDT |
| July 31 | Q2 VAT return (quarterly filers) | GDT |
| October 31 | Q3 provisional CIT payment | GDT |
| October 31 | Q3 VAT return (quarterly filers) | GDT |
| Monthly (20th) | VAT return (monthly filers) | GDT |
| Monthly (last day) | SI/HI/UI contributions | VSS |
High-priority annual deadlines clustered around March 31 — the busiest compliance month of the year.
How a Local Compliance Partner Helps {partner}
Vietnam’s compliance framework rewards proactive planning far more than reactive remediation. A penalty of VND 500 million and six months of GDT back-and-forth can be avoided with the right processes in place from day one.
A qualified local compliance partner accounting firm, tax agent, or integrated corporate services provider typically helps with:
- Monthly bookkeeping compliant with Vietnam Accounting Standards (VAS)
- E-invoice setup and integration with your ERP or accounting software
- Monthly/quarterly tax return preparation and submission via the GDT eTax portal
- Payroll processing with accurate SI/HI/UI calculations and monthly VSS reporting
- Annual CIT and PIT finalisation with supporting schedules
- DPI annual report preparation (frequently overlooked by pure tax advisors)
- Transfer pricing documentation for related-party transactions
- Audit preparation and liaison with your appointed auditor
- GDT audit defence responding to information requests and managing inspections
The cost of a reputable local partner is almost always lower than a single significant penalty and significantly lower than the management time lost navigating a GDT audit without documentation.
Frequently Asked Questions {faq}
What happens if we miss the March 31 CIT filing deadline?
Late filing triggers an administrative penalty (VND 2–25 million depending on delay duration) plus late-payment interest at 0.03% per day on any unpaid tax. Filing late does not extend the payment deadline interest runs from April 1 regardless of when you file.
Can we extend the CIT annual return deadline?
Vietnam does not have a formal extension mechanism for the CIT annual return comparable to some other jurisdictions. In practice, the GDT has occasionally accepted late filings with a formal written explanation, but this is discretionary and penalties are not automatically waived.
Does the 80% provisional CIT rule apply to loss-making companies?
The rule applies to the provisional payments relative to the final liability. If your actual CIT liability is zero (due to losses), you have no shortfall issue. However, if you were profitable in Q1–Q3 and made provisional payments, those are refundable or creditable against future years.
Are all employees covered by mandatory social insurance?
All Vietnamese employees working under a labour contract of one month or more must be enrolled in SI/HI/UI. Foreign employees holding a work permit (not an exemption certificate) are also required to contribute since January 1, 2022.
What is the penalty for not registering for e-invoicing?
Failure to register and use the GDT-mandated e-invoice system can result in fines of VND 10–20 million and more significantly the buyer’s inability to claim input VAT on non-compliant invoices, which creates a downstream commercial dispute.
Do branch offices have separate compliance obligations from the parent company?
Yes. A branch office in Vietnam is a separate tax registration entity with its own MST (tax code), its own VAT and PIT filing obligations, and its own SI/VSS registration. The parent company’s filings do not cover the branch.
Ready to Stay Compliant in 2026?
Vietnam annual compliance is manageable but only if you have a clear system, the right local partners, and a reliable deadline calendar. The penalties for getting it wrong are significant, and they compound quickly.