In short — as of August 2026: Importing a car to Portugal runs on two clocks. Within 20 working days of the car entering Portugal, you must file the DAV (customs vehicle declaration) via the Portal das Finanças; if it's assessed, ISV (vehicle tax) is generally due within about 10 business days. If you're transferring residence — lived abroad 12+ months, owned the car 6+ months, applying within 12 months of the move — you can claim the ISV transfer-of-residence exemption, which can reduce the tax to zero. You then have 60 days to register with the IMT for Portuguese plates, which requires a valid EU Certificate of Conformity (COC) and a Category B inspection. Drive it overland with no shipping paperwork, and toll or fuel receipts become your proof of the entry date that starts all these clocks.
Our full step-by-step guide to importing a car to Portugal covers the process end to end. This one walks a real case through it, because the rules read cleanly on paper and get genuinely fiddly the moment you apply them to one specific car, one specific route and one specific set of dates.
Case study — Lawrence, UK, D3 visa, standard 2018 Audi A5 2.0 TFSI. Lawrence has a Portuguese NIF and a residence visa, and drove his own car from the UK to Portugal overland, via France and Spain, entering Portugal on roughly 8 August. His UK insurer covers him for 90 days abroad. He wants the ISV transfer-of-residence exemption, and — sensibly — wants to avoid paying for a Certificate of Conformity he might not actually need.
Proving the entry date when there's no shipping record
Someone shipping a car from further afield gets a bill of lading or ferry ticket with a clear date on it. Lawrence drove through the Schengen area, so there's no port stamp, no customs checkpoint, nothing that automatically timestamps his crossing. What Customs will generally accept instead: toll receipts, fuel receipts, or other dated records from the journey that plausibly place the car in Portugal on a given day. For Lawrence, that means digging out the fuel stop or toll charge nearest 8 August and keeping it — that date is what starts his 20-working-day DAV clock, so he needs to be able to defend it if asked.
The DAV: your 20-working-day clock
The DAV (Declaração Aduaneira de Veículos) is the customs vehicle declaration, filed through the Portal das Finanças, and it has to go in within 20 working days of the car entering Portugal. Counting from 8 August, that puts Lawrence's deadline in early September — tight enough that this shouldn't wait until "settling in" is done. Miss it and penalties and interest apply, calculated back to the entry date. Once the DAV is filed and ISV assessed, payment is generally due within about 10 business days via the automatically generated payment document (DUC). If he's claiming the transfer-of-residence exemption, that claim is lodged as part of this same DAV process — it isn't a separate later step.
The ISV transfer-of-residence exemption: does Lawrence qualify?
This is the exemption that can turn a real tax bill into zero, so it's worth working through the conditions against his facts:
- Lived abroad at least 12 months before the move. If Lawrence was UK-resident in the year before relocating, this is met.
- Owned and used the car at least 6 months before transferring residence. A 2018 Audi he's had for years easily clears this.
- Apply within 12 months of the change of residence, using Form 1460.1 on the Portal das Finanças.
- The tax normally due on the vehicle abroad wasn't itself avoided — i.e., it was a normally-taxed UK car, not something bought exempt.
On the facts given, Lawrence looks like a good candidate — but the exemption has to be claimed and evidenced, not assumed, and Customs checks the ownership and residence timeline closely. Running his Audi's numbers (2.0-litre petrol, moderate CO₂) through GrowIN's ISV import calculator gives an indicative unexempted estimate in the region of €3,000–€4,500 — a genuinely material number, and the reason it's worth getting the exemption paperwork right rather than skipping it to save a step. If approved, ISV drops to €0 and he only carries the administrative and inspection costs. Confirm your own car's exact figure with the Tax Authority's official simulator — ISV depends heavily on your specific engine, CO₂ and age.
The Certificate of Conformity: does he actually need one?
Here's where Lawrence's instinct to check first is the right one. A Certificate of Conformity (COC) — proving the car meets EU technical and environmental standards — is required to pass the Category B inspection, file the DAV, and register the car with the IMT. Without a valid COC, you're pushed into an individual homologação, which is slower and more expensive.
But not every non-Portuguese car needs a new COC ordered. What matters is whether the vehicle already carries a valid EU whole-vehicle type-approval. A standard 2018 UK-market Audi A5 2.0 TFSI — not a US-spec import, not a special edition built to a different market's rules — was almost certainly built under the same EU type-approval as its equivalents sold across the rest of Europe, since the UK was still an EU member when that car was type-approved and registered. In that case, Lawrence likely doesn't need to pay for an individual homologação at all — he can order a standard COC from Audi (via its manufacturer COC service) using the car's VIN, which is usually far cheaper and faster. The mistake to avoid is assuming that "UK car = individual homologação" and paying for the expensive route before checking the VIN and type-approval details with the manufacturer or a specialist. Post-Brexit UK-built vehicles, or genuinely US-spec cars, are a different story and more likely to need individual homologação — but that's not what a standard pre-existing 2018 model usually is.
Inspection, registration and plates
With the COC in hand, the car needs a Category B technical inspection (IPO) confirming it meets Portuguese roadworthiness standards. Once the DAV is cleared and ISV is settled (or the exemption is approved), Lawrence has 60 days to complete IMT registration, which issues Portuguese plates (matrícula) and the DUA (Documento Único Automóvel) — the single document that then proves ownership and registration together. Only once the DUA is issued is the car legally Portuguese.
Driving on foreign plates and insurance in the meantime
Lawrence can generally keep driving his Audi on its UK plates and UK insurance while he works through the DAV and registration steps, provided he stays within the legal windows and his cover remains valid. The pressure point is his 90-day UK insurance window: 20 working days for the DAV plus up to 60 days for registration is, in the worst case, not far off 90 calendar days if anything is delayed — a slow COC, a backed-up inspection slot, a queried document. He should line up Portuguese car insurance well before the 90-day mark rather than assume the legalisation process and the insurance clock will simply align.
Road tax and the annual bill
Once registered, Lawrence pays Portugal's annual road tax, the IUC (Imposto Único de Circulação), every year he owns the car — a separate, recurring cost from the one-off ISV. It's worth budgeting into his ongoing cost of living in Portugal rather than treating the import as a one-time expense.
What it costs, at a glance
| Step | Deadline from entry | Typical cost |
|---|---|---|
| DAV filing | Within 20 working days | Filing itself is free; penalties apply if late |
| ISV payment (if due) | ~10 business days after assessment | Depends on engine/CO₂/age — often several thousand euros without exemption |
| ISV transfer-of-residence exemption | Claimed with the DAV, within 12 months of the move | €0 ISV if approved |
| COC (manufacturer, standard model) | Before inspection/DAV | Often well under individual homologação cost |
| Individual homologação (if no valid COC) | Before inspection/DAV | Higher cost, longer timeline |
| IPO Category B inspection | Before/at registration | Standard inspection fee |
| IMT registration (plates + DUA) | Within 60 days of ISV settlement | IMT registration fee |
| IUC road tax | Annual, ongoing | Varies by vehicle |
| GrowIN car-import assistance | — | €390 + state taxes (ex-VAT) |
Things to Watch
- Ordering a COC — or assuming individual homologação — before checking the VIN. Confirm the type-approval status with the manufacturer first; a standard pre-Brexit UK model often already qualifies for a cheap, fast COC.
- Losing track of the entry date. With no shipping paperwork, save toll and fuel receipts from the crossing the day it happens, not weeks later.
- Treating the exemption as automatic. It has to be actively claimed on Form 1460.1 within 12 months of the move, with the 12-month prior residence and 6-month ownership evidenced.
- Letting foreign insurance lapse before registration completes. Line up Portuguese cover ahead of the deadline, not after a gap appears.
- Missing the 20-working-day DAV window. It's counted in working days, and penalties are calculated from the entry date.
- Underestimating ISV if the exemption is refused. Run the numbers on the official simulator before you're relying on an assumption.
Frequently asked questions
No — it removes the ISV tax specifically. You still pay IMT registration and inspection fees regardless.
You pay ISV in full, calculated on engine size, CO₂ and the vehicle's age-based reduction — use the ISV calculator for an estimate, then confirm with Customs' official simulator.
Selling soon after claiming the exemption can trigger scrutiny or repayment obligations — check the current conditions with Customs before committing to a quick resale.
Yes — importing the car and exchanging your driving licence are two different processes with different deadlines; see our driving licence exchange guide.
Rules, ISV components and processing times change, and every vehicle is assessed on its own facts — confirm your figures with the Tax Authority's official simulator on the Portal das Finanças and your registration requirements with the IMT. Getting your NIF sorted first makes every step of this faster.
Want your import handled without guessing on the COC or missing the DAV window? Our team's car-import assistance is €390 + state taxes (ex-VAT) — read the full import guide or talk to an immigration lawyer about your specific vehicle.