Renting a Car in Portugal: Insurance, Excess, Deposit and the Toll Transponder

The Portuguese rental market is fiercely competitive, with headline rates that can be spectacularly low off season. The trade-off hides in the insurance grid: the included CDW frequently leaves an excess of €800 to €1,500, sometimes more on SUVs, and the deposit blocked on your credit card roughly matches that amount. The low-cost brands at Faro or Porto airport offset their rock-bottom prices with a hard sell of their zero-excess package at the counter.

The three classic solutions apply: the company's zero-excess package (the priciest, often €10 to €20 per day), third-party excess insurance bought online (a few euros per day, reimbursed after the fact), or a premium credit card's insurance — well accepted in Portugal, unlike Ireland, provided you pay for the rental with that card. In every case, a credit card in the main driver's name remains essential for the deposit: debit cards are regularly refused or surcharged.

Here are the possible strategies for a typical two-week rental.

Portugal's most disorienting feature remains its dual toll system: conventional motorways with toll booths, and electronic-only stretches with no barriers or kiosks, where gantries photograph your plate. You cannot pay these in cash: without the right device, the fine is issued automatically — and rental companies pass it on with an administration fee. The fix is simple: ask for the Via Verde transponder offered by every rental company (a few euros per day, capped monthly, plus the tolls you use), which settles every passage automatically and, as a bonus, lets you use the reserved lanes at conventional toll plazas.

Good news since 1 January 2025: Portugal has scrapped tolls on several former 'SCUT' motorways — including the Algarve's A22, the A23, A24, A25 and part of the A28 — which has significantly cut the bill for routes to the south and the interior. Gantries remain active on other stretches: our detailed article on Portuguese tolls covers it road by road, with the free alternatives when they are worth it.

Central Lisbon applies a low-emission zone (ZER) restricting the oldest vehicles — recent rental cars pass without issue, but parking rules and traffic make a car counter-productive in the capital anyway, as in Porto. The proven strategy: explore the cities on foot and by public transport at the start or end of the trip, and only pick up the car when heading for the Algarve, the Alentejo, the Douro valley or the Peneda-Gerês park.

On the road, two local rules deserve attention: the alcohol limit is 0.05%, and Portugal's points-based licence ('carta por pontos') comes with regular speed enforcement. A worldwide meta-analysis by José Castillo-Manzano and Mercedes Castro-Nuño published in 2012 in Transport Policy shows that introducing a points system significantly reduces fatal crashes in its first years, especially when paired with visible enforcement (study on Google Scholar: scholar.google.com/scholar?q=Castillo-Manzano+Castro-Nu%C3%B1o+driving+licenses+based+on+points+systems+meta-analysis) — and the Portuguese network is well monitored today, notably on the A2 and the Algarve's main roads.

Faro, Lisbon and Porto concentrate the supply and the best prices; downtown agencies are sometimes cheaper than the airport but complicate day-one logistics. In summer, the Algarve sells out of small categories weeks in advance: book early, especially as Portuguese prices climb steeply through July and August. Off season, value for money is unbeatable — and it is also the best time for the Douro valley and the Alentejo.

As for size, a small city car remains the best choice: historic centres (Óbidos, Évora, the schist villages) mean threading through lanes where an SUV suffers, and the mountain roads of Gerês or the Serra da Estrela are narrow but perfectly surfaced. Book a diesel if you plan long distances: diesel remains noticeably cheaper than petrol in Portugal. Our 'Portugal on Your Own' guide details itineraries, stages and the budget line by line.