Spain debt interest could rise to 72.3 billion by 2031

For investors, the headline risk is not just bigger deficits. It is slower fiscal flexibility in the next downturn, which can feed back into sovereign-bond pricing, bank funding costs and the valuation of Spanish assets. When a government’s interest bill swells by almost 29 billion euros a year at the peak, the margin for tax cuts, fresh spending or emergency stimulus shrinks fast.

Funcas’ central scenario assumes unchanged policies, with economic growth easing to 1.7% from 2028 and the deficit staying above 3% from 2030. In the more severe case, where inflation pressures tied to energy and geopolitical tensions persist, the extra interest burden between 2026 and 2031 reaches 84.6 billion euros. Even the milder case is still costly: about 63.7 billion euros in annual interest by 2031, or 20 billion more than now.

That is the real story behind Spain’s rising debt bill. The country may be borrowing against a future that still looks reasonably stable on paper, but the cost of carrying that debt is climbing just as the economy faces an inflation backdrop that remains above the European Central Bank’s target. September inflation of 4.9% underscores how quickly the environment can turn less forgiving.

For long-term investors, the takeaway is simple: Spain is not facing an immediate funding crisis, but it is entering a more expensive phase of public finance. That can matter for bondholders, for banks such as BBVA that are tied to domestic credit conditions, and for anyone thinking about Spain’s ability to sustain growth-friendly spending over the next decade.