Vietnam's Personal Income Tax (PIT, Thuế thu nhập cá nhân) applies progressive rates from 5% to 35% on employment income for tax residents, and a flat 20% on employment income for non-residents. Tax residency is triggered by 183+ days present in a tax year, or having a 'habitual residence' (registered permanent/temporary residence, or a leased home in Vietnam for 183+ days including hotel/serviced apartment stays). Residents are taxed on worldwide income; non-residents only on Vietnam-source income.
Foreigners working in Vietnam under a local contract or seconded from abroad are routinely caught out by the 183-day residency test — cross the threshold and your entire global salary (not just your Vietnam pay) becomes taxable in Vietnam, though double tax treaty relief can often be claimed back home.
Key Facts
Resident PIT is progressive across 7 bands: 5%, 10%, 15%, 20%, 25%, 30%, 35% (top band applies above VND 80,000,000/month, roughly USD 3,200).
Non-tax-residents pay a flat 20% on Vietnam-source employment income, with no personal deductions.
Personal deduction for residents: VND 11,000,000/month (VND 132,000,000/year) for the taxpayer, plus VND 4,400,000/month per qualifying dependent.
Tax residency: 183+ days in Vietnam in a calendar year OR 12 consecutive months from arrival, OR a registered permanent/temporary residence, OR a leased home (incl. hotels) for 183+ days when day-count is ambiguous.
Employment income, most allowances, and certain benefits-in-kind (e.g., employer-paid housing above a cap, school fees, home leave) are all within the PIT net for residents.
PIT finalization (annual tax return) is due by the last day of the 3rd month after the calendar year end (typically 31 March) for individuals filing directly; employers filing on behalf of employees have their own deadline.
Steps
Determine residency status — Count days physically present in Vietnam in the calendar year. 183+ days (or a registered residence) makes you a tax resident taxed on worldwide income; fewer days makes you a non-resident taxed only on Vietnam-source income at a flat 20%.
Register a tax code (Mã số thuế) — Foreign employees must obtain a personal tax code from the local tax department, usually arranged by the employer within 10 working days of starting work. This is required before any PIT can be declared or refunded.
Monthly provisional withholding — Employers withhold PIT monthly (or quarterly for some employers) based on estimated annual income and declared dependents, and remit it to the tax authority on the employee's behalf.
Annual finalization (quyết toán thuế) — At year-end, PIT is reconciled against actual income. Most employees have their employer finalize for them; individuals with multiple income sources or who want to claim dependent deductions not yet applied must self-file by 31 March of the following year (or the relevant statutory deadline).
Claim treaty relief if applicable — If your home country has a double tax treaty with Vietnam, keep a Vietnam tax residency certificate or tax payment receipts to support a foreign tax credit or exemption claim at home.
Costs
Personal deduction (taxpayer): VND 11,000,000/month (~USD 440)
Dependent deduction: VND 4,400,000/month per dependent (~USD 176)
Top marginal PIT rate (residents): 35% (income above ~VND 80,000,000/month)
Non-resident flat rate: 20% of Vietnam-source employment income
Timelines
Tax code registration: Typically 5-10 working days after employment starts
Annual PIT finalization deadline: By 31 March following the tax year (self-filers); employer-filed deadlines can differ slightly
PIT refund processing: Often 1-6 months after filing, longer for foreign nationals without a clean audit trail
Required Documents
Passport and valid visa/work permit or Temporary Residence Card
Personal tax code (Mã số thuế cá nhân)
Labor contract or secondment/assignment letter
Dependent registration documents (birth certificates, marriage certificate) if claiming dependent deductions
Annual PIT finalization form (Form 02/QTT-TNCN or employer-filed equivalent)
Assuming a work permit alone determines tax residency — it is day-count and registered residence that matter, not immigration status.
Not tracking days precisely across multiple short trips to Vietnam, then being surprised by a 183-day-triggered worldwide income assessment.
Forgetting that certain employer-paid benefits (housing over the deductible cap, children's international school fees, home leave flights) are taxable income, not tax-free perks.
Missing the annual finalization deadline when changing employers mid-year, leaving a gap in withholding that creates a tax liability discovered too late.