French experts in Vietnam live in two quite different worlds: engineers and managers at French enterprises, and lecturers and researchers in bilateral education and training cooperation programmes. The two groups share one domestic residence framework, but at treaty level the second group may fall under a special teachers-and-researchers clause instead of the ordinary employment article. This article analyses the French case; other nationalities in the series share the residence framework without this special-clause layer, while the German case carries project permanent-establishment risk, covered in the neighbouring article.
1. Domestic framework: residence and computation
Under Article 2 of PIT Law 109/2025/QH15 (replacing Law 04/2007/QH12, applying from the 2026 tax period), a resident is present in Vietnam for 183 days or more in a calendar year or in 12 consecutive months from first arrival, or has a regular place of abode in Vietnam under a fixed-term home lease. A French expert working long-term in Vietnam is a resident: worldwide income, the five-bracket progressive scale in Article 9, and personal relief in Article 10 (VND 15.5 million per month for the taxpayer; VND 6.2 million per dependant). A short-term visitor below the residence threshold pays 20% on Vietnam-source income with no relief — unless the treaty layer produces a different result, as analysed below.
2. The Vietnam–France treaty: employment article and the special clause
The Vietnam–France double taxation agreement is in force. Its dependent personal services article (Article 15) applies the familiar trio of conditions: presence in Vietnam not exceeding 183 days in the relevant period; the payer not being a Vietnamese resident; and the salary not being borne by a permanent establishment in Vietnam — meet all three and the salary is taxable only in France. For lecturers and researchers coming to teach or research at recognised institutions under cooperation programmes, however, many of Vietnam’s treaties — including the treaty network with France — reserve a separate teachers-and-researchers article with its own time-limited exemption in the host state. The methodological point matters: check the special clause before applying the ordinary 183-day mechanism, because the two articles give different outcomes and applying the wrong one is an error both tax authorities spot easily when files are cross-checked.
3. Documents: the French residence certificate and cooperation files
The central document is the tax residence certificate (attestation de residence fiscale) issued by the French tax administration for the relevant year. For the education cooperation group, the file also needs the programme assignment letter, the inter-institution cooperation agreement, and documents showing the salary source sits outside Vietnam. French files hit two practical bottlenecks: the French certification cycle does not align with the Vietnamese finalisation calendar, so first-year files are often completed after the fact; and a French expert’s package may include allowances specific to the French expatriation system (expatriation allowance, housing support) — Vietnam determines the taxability of each item under Vietnamese law, not under the French classification. All French documents must be translated and legalised as tax administration requires before filing.
4. Risks and two-end coordination
The first risk is applying the ordinary 183-day mechanism to someone who belongs under the teachers-and-researchers clause, or self-applying the special clause where the programme is not recognised: both directions produce wrong withholding from the start of the period. The second is forgetting that treaty exemption does not mean exemption from procedure: the treaty-application notification must still be filed and can only be completed once the residence certificate arrives. The third is period mismatch: French assignments often end mid-academic-year, misaligned with the calendar tax year, splitting the end-of-assignment finalisation into two periods and inviting omission of the second. The Vietnamese host institution should open the expert’s tax file at invitation-letter stage, recording which treaty article is expected to apply and the document completion schedule, rather than leaving the individual to improvise at finalisation season.
This article has been quality-reviewed by the FLAW AI Legal Council