Malaysian experts in Vietnam work mainly in offshore oil and gas projects in the south, manufacturing plants, and Malaysian-owned financial services. This nationality holds one of the earliest double taxation agreements Vietnam ever signed, and the treaty’s age creates its own problem: the original text was drafted to the models and context of decades ago, while domestic tax administration has moved through several generations of law. This article analyses Malaysian experts; the domestic residence framework applies uniformly across the series, while the Thai case in the neighbouring article raises a technical service fee boundary issue unlike this one.
1. Residence: the domestic base under Law 109/2025/QH15
Article 2 of PIT Law 109/2025/QH15 (replacing Law 04/2007/QH12 from the 2026 tax period) makes an individual a resident when present in Vietnam for 183 days or more in a calendar year or in 12 consecutive months from the first day of presence, or when he has a regular place of abode in Vietnam under a fixed-term home lease. Malaysian experts working offshore rotations need care with the day count: days of presence are determined from entry–exit records and time present in the territory and maritime zones under Vietnam’s jurisdiction per project records, not from airline schedules. Residents declare worldwide income on the five-bracket scale (Article 9) with personal relief (Article 10); non-residents pay 20% on Vietnam-source income.
2. The Vietnam–Malaysia treaty: applying a long-standing text
The Vietnam–Malaysia double taxation agreement is in force; its dependent personal services article (Article 15) keeps 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. The practical difference from newer treaties lies in drafting detail: some long-standing treaties phrase the 183-day period, the permanent establishment concept or the scope of dependent services in older language, and may have acquired protocols or exchanges of notes over time. Before applying it, the file handler must check the current treaty position including amendments, rather than an internal copy circulated years ago. Second, income of offshore oil and gas experts may attach to exploration and exploitation activities, for which some treaties carry their own source rules; that must be checked before concluding under the ordinary Article 15 route.
3. Documents and two-country file coordination
The treaty file comprises a certificate of tax residence issued by the Malaysian tax authority (LHDN) for the relevant year; the employment or secondment contract identifying payer and salary cost-bearer; presence records — for offshore personnel, rotation rosters and project crew lists reconciled with entry–exit stamps; and the treaty-application notification filed with the Vietnamese tax authority under the Law on Tax Administration 108/2025/QH15. One practical advantage: Malaysia runs a calendar tax year aligned with Vietnam’s, easier than countries with offset fiscal years; even so, the residence certificate must match the year and the individual, and cannot be replaced by a letter from the Malaysian employer.
4. Risks specific to the Malaysian group
The first risk is documentary: relying on a treaty text that omits later protocols, so the exemption conditions are misstated. The second is project drift offshore: rotation rosters thicken as the project progresses, pushing days of presence over the domestic residence threshold while the employer keeps withholding at the 20% non-resident rate and never finalises the expert as a resident. The third is salary paid through an intermediary oilfield services company — where the formal payer differs from the real cost-bearer, the treaty’s payer and borne-by conditions must be analysed on substance, not on the contract’s labels. All three risks are controlled by a continuously maintained presence record and a treaty-version check at the time the file is built.