Withholding is the company’s job — contracted days, not a guess

In plain termsPersonal income tax (PIT) withholding sits on the Vietnam payer. The switch is the working time written on the contract or secondment letter. Cost-recharge does not hide the wage.

Start here — three checks

Read the contract length, not yesterday’s stamp. yes
Non-resident employment rate. 20%
Recharge still withholds. yes

HR map — who deducts, on what clock

Payroll fact	Employer duty	If HR waits for “days already here”
Contract / secondment says 183+ Vietnam working days	Progressive resident-style withholding path.	You under-withhold in month one because the person just landed.
Contract says under 183 Vietnam working days	Non-resident employment flat 20%.	You run local brackets on a short secondment.
Foreign parent pays; Vietnam entity reimburses	Cost-recharge still triggers Vietnam withholding.	You treat it as “not our payroll.”
BHYT on a ≥12-month labour contract	Separate insurance limb. Employer share 2/3 for that cohort.	You mix health insurance with PIT withholding calendars.

Common wrong movesThis is not the worker’s 20% explainer.

Starting progressive withholding only after the 183rd calendar day in country.
Skipping withholding because the employment contract is with the parent.
Calling year-end finalization a substitute for monthly withholding.

If the file is already wrongCorrect the payer clock. Then the person.

Re-read the contracted Vietnam working time and the recharge trail.
Point the employee to the individual 20% page only for their rate door — not as HR policy.
Year-end actor (company vs employee) lives on the finalization page.

Evidence and sources4 dated facts for Vietnam employer PIT withholding for foreign employees

The readable briefing above uses these cells. Open a source only when you need to verify a number, date, or legal gate.

Employer withholding for inbound foreigners keys off contracted Vietnam working time, not only days already stayed
NĐ 253/2026/NĐ-CP Điều 50 khoản 3 điểm c — withholding uses working time in Vietnam stated on the contract or secondment letter (183+ progressive vs under-183 Điều 64), including when a Vietnam party reimburses foreign payroll cost
yeschecked Aug 2026
Flat rate on Vietnam-source employment income for non-residents
Luật 109/2025/QH15 Điều 21; NĐ 253/2026/NĐ-CP Điều 64 khoản 1
20%checked Aug 2026
Vietnam cost-recharge of foreign payroll still triggers Vietnam withholding
NĐ 253/2026/NĐ-CP Điều 50 khoản 3 điểm c — including where a Vietnam party reimburses wage cost to a foreign party
yeschecked Aug 2026
Employer share of BHYT for that cohort
Luật BHYT Điều 13 khoản 1 điểm a
2/3checked Aug 2026

Individual 20% doorThe worker’s rate. Not the withholding calendar.Who files finalizationMonthly withholding is not the yearly actor map.Labour-contract clausesTerm, written contract, BHYT trigger — the document withholding reads.

Common questions

Do we withhold using days the employee has already stayed, or the contract?

For inbound foreigners, withholding keys off working time in Vietnam stated on the contract or secondment letter — not only days already stayed. Contracts of 183 days or more follow the progressive path; shorter ones follow the non-resident employment rule.

The salary is paid by the foreign parent and we only reimburse cost. Still withhold?

Yes. Where a Vietnam party reimburses wage cost to a foreign party, Vietnam withholding still triggers.

Is the 20% rate the employee’s problem only?

The 20% flat rate is the non-resident employment rate the worker sees. This page is the employer’s withholding duty. The individual 20% explainer is a different door.