Importing your car: ISV, the 20-day clock and 6-month rule

A UK-registered car sitting in northern Portugal, and an owner asking the group "where do I keep it and what do I actually have to do?" — this is one of the most under-planned parts of a move. The tax can be steep, the deadlines are real, but there is an exemption a lot of new arrivals miss entirely and end up paying for no reason.

The process and the clock

Legalising an imported car runs roughly 90 days, and sometimes up to a year for the full thing. Crucially, it is deadline-driven from the moment the car enters the country, so the clock is already running before most people realise there is one.

The exemption worth checking

• New residents: if you lived abroad for at least 6 months and owned the car for at least 6 months, you can qualify for a full ISV exemption on one vehicle under the mudança de residência rules.
• Electric cars are exempt from both ISV and the annual IUC road tax; plug-in hybrids get a −75% reduction on ISV.
• Miss the 20-day or 60-day deadline and the process gets messier and potentially more expensive — treat the clock as real from day one.
• Because ISV varies so much by vehicle, run your specific car through an ISV calculator before deciding whether importing even makes sense versus selling and rebuying locally.

The reason so many people overpay or fall foul of the deadlines is that nobody hands you a countdown when your car crosses the border — the clock starts silently. By the time a new arrival thinks "I should sort the car out", the 20-working-day window for the customs declaration may already be uncomfortably close, and ISV on an older, higher-emission vehicle can run into serious money. Treating the car as a day-one item, alongside the NIF and the licence exchange, is what keeps it cheap and calm rather than expensive and rushed.

Before you even ship the car, it is worth doing the honest sum: run your specific vehicle through an ISV estimate, weigh it against the exemption you might qualify for, and compare the total against simply selling at home and buying an equivalent car here. Sometimes the sentimental or practical case for bringing your own car wins; sometimes the tax and hassle make a local purchase the smarter move. Either way, decide it deliberately with the numbers in front of you, not by default because the car happened to be yours.

Full detail in importing a car to Portugal, and pair it with exchanging your driving licence, since both are deadline-driven and easy to leave too late. Fit them both into your arrival plan on the checklist.

Re-locant.com is a free, independent guide. We would rather you check the exemption than overpay.