Fuels will increase in price next week, with diesel seeing the largest rise.
Why the price of diesel is rising more than that of petrol
Friday, 6 March 2026RSS
Context & Explainers
The ISP (Imposto sobre Produtos Petrolíferos e Energéticos) is Portugal's excise tax on petroleum and energy products, charged as a fixed amount per liter on petrol, diesel, and other fuels. It is one of the main components of fuel prices at the pump, alongside VAT and the carbon tax (Taxa de Carbono).
The government can adjust ISP rates — temporarily or permanently — to influence fuel prices. Rate cuts are a common policy tool to ease cost-of-living pressures on drivers and transport businesses, though they also reduce government revenue.
For consumers, the ISP is significant because even small changes in the per-liter rate translate into noticeable differences at the pump, particularly for diesel users and commercial transport operators.
Higher crude oil prices raise wholesale fuel costs, and those increases typically reach Portuguese petrol and diesel pumps within days to weeks; the recent conflict has pushed oil to one‑year highs and European gas futures up roughly 40%, making fuel the first likely victim. Final pump prices also depend on taxes, VAT and distributor margins, so consumers should expect higher filling‑station bills but the exact change will reflect those tax and margin components as well as exchange rates.
AI Summary AvailableGovernment cuts diesel ISP by 3.55 centsRead the synthesized summary with context and explainers
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