Millions of Spaniards are filing their tax returns this week, but new figures suggest the biggest winner will once again be the taxman.

Spain’s total tax take and social security contributions hit a record €591.6 billion in 2024, according to analysis by the Instituto Juan de Mariana – the highest level ever recorded.

Latest data shows tax revenues alone jumped 10.4% in 2025, reaching €325.3 billion, while social security contributions added another €176.9 billion.

When regional and local taxes – such as property tax (IBI) and vehicle tax – are included, along with contributions from civil servants, the total climbs even higher.

Based on Eurostat figures, Spain’s overall tax burden is forecast to hit 38.3% of GDP by 2026, equivalent to around €671.5 billion.

That would mark a sharp rise from just over 34% a decade ago.

The ‘hidden tax hike’

Economists say a key driver behind the surge is what they describe as a ‘stealth tax increase’.

According to analyst Santiago Calvo, the government’s decision not to adjust income tax bands in line with inflation has effectively pushed millions of people into higher brackets – without any real increase in purchasing power.

‘If we adjust for inflation, nobody is paying less than before, we’re all paying more,’ he told national newspaper El Debate.

The result is a phenomenon known as ‘fiscal drag’ – where rising wages (driven by inflation) lead to higher tax bills even if real income hasn’t improved.

Households paying the price

The impact on households is significant. The think tank estimates that failure to update tax bands has generated €27.6 billion in extra revenue between 2019 and 2023 alone.

Since 2018, direct taxes paid by families have risen 56.3% in nominal terms, and 31.1% in real terms, adjusted for inflation.

On average, households are now paying €1,657 more per year in constant euros.

Meanwhile, the effective income tax rate has climbed to 15.1% – the highest level since records began in 1995.

A growing burden

Overall, the share of household income going to direct taxes has risen from 13.6% to 15.9% in recent years.

Critics argue the increase has come without a clear political decision to raise taxes, instead driven by inflation and policy inaction.

It comes as Spain continues to be praised around the world for having one of the fastest growing economies in the advanced world.

However, while GDP may be growing, many families are not feeling the benefits of the growth in their pockets.