⛽ Government reduces discount on ISP on diesel and gasolinePhoto by Franco Monsalvo on Pexels
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⛽ Government reduces discount on ISP on diesel and gasoline

Eco28 August 2026 at 22:27

The Government decided to reduce the discount on the Excise Duty on Petroleum Products applied to road fuels, which will result in a less pronounced price drop in the week beginning August 31. According to the order published in the Official Gazette, the ISP discount for diesel decreases from 81.61 to 71.63 euros per 1,000 liters, while for unleaded gasoline it goes from 53.98 to 51.62 euros per 1,000 liters. The order was signed by the Secretary of State for Tax Affairs, Cláudia Reis Duarte.

The Automóvel Clube de Portugal had forecast for next week a drop of 7.5 cents in the price of a liter of diesel and a rise of 1.5 cents in the price of a liter of gasoline. However, the Executive contradicted this ACP estimate, projecting price drops for both diesel and gasoline. Brent crude closed this Friday down 0.43%, at $89.31, with markets watching inflation in the United States and the situation in the Strait of Hormuz.

The support for consumers in purchasing fuels is due to the war in the Middle East, with the ISP discount offsetting the additional VAT revenue for the State. The mechanism remains active while fuels are ten cents above the price practiced in the week of March 2 to 6, before the US attacks on Iran and the blockade of the Strait of Hormuz, leading the Executive to adjust the discount value weekly.

According to the ACP's estimate, before the application of the new discount, the average price of diesel should fall to 1.996 euros per liter next Monday, while gasoline should rise to 2.004 euros per liter, based on current average prices from the Directorate-General for Energy and Geology. If this estimate is confirmed, gasoline could once again cost more than diesel.


O Governo decidiu diminuir o desconto aplicado em ISP sobre os combustíveis rodoviários, o que terá como efeito prático uma descida menor dos preços dos combustíveis na próxima semana.

De acordo com a portaria publicada no Diário da República, o Executivo antecipa descidas nos preços do gasóleo e da gasolina na semana que se inicia a 31 de agosto. Assim, o desconto no ISP aplicado ao gasóleo passa de 81,61 para 71,63 euros por cada 1.000 litros, enquanto na gasolina o desconto encolhe de 53,98 para 51,62 euros por cada 1.000 litros.

De acordo com o Automóvel Clube de Portugal (ACP), estava prevista para a próxima semana uma descida de 7,5 cêntimos no preço do litro de gasóleo e uma subida de 1,5 cêntimos no preço do litro de gasolina. No entanto, o Governo perspetiva uma baixa de preços na gasolina, contrariando a estimativa do ACP lançada ainda de manhã.

“Face à perspetiva de que na próxima semana se irá registar uma descida dos preços do gasóleo rodoviário e da gasolina sem chumbo, o Governo decidiu ajustar o desconto extraordinário e temporário no ISP em vigor aplicável ao gasóleo rodoviário e à gasolina sem chumbo”, indica a portaria assinada pela secretária de Estado dos Assuntos Fiscais, Cláudia Reis Duarte.

A cotação do barril de petróleo de Brent para entrega em outubro terminou esta sexta-feira em baixa de 0,43%, para 89,31 dólares, com o mercado a continuar atento à inflação nos Estados Unidos e ao Estreito de Ormuz.

Face à guerra no Médio Oriente, o Governo decidiu apoiar os consumidores na aquisição de combustíveis devolvendo, através de um desconto no ISP, o aumento da receita do Estado com o IVA. O desconto mantém-se em vigor enquanto os combustíveis estiverem dez cêntimos acima do preço praticado na semana de 2 a 6 de março, antes dos ataques dos EUA ao Irão e ao bloqueio do Estreito de Ormuz. Assim, semanalmente, o Governo tem vindo a ajustar o desconto no ISP.

Segundo a estimativa do ACP, antes de se saber o desconto aplicável em ISP, o preço médio do diesel deveria cair para 1,996 euros por litro na próxima segunda-feira, enquanto a gasolina deveria aumentar para 2,004 euros por litro, tendo em conta os preços médios atuais divulgados pela Direção-Geral de Energia e Geologia (DGEG). A confirmar-se, a gasolina poderia passar a custar novamente mais do que o gasóleo.

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