A few years ago, when inflation skyrocketed in Europe and the United States, we all started hearing a term that politicians kept mentioning: deflating. Especially in Spain, the debate about deflating the IRPF became unavoidable. But most people still didn't really understand what a deflator is and why it mattered so much.

Essentially, a deflator is a fairly simple but powerful economic concept. It’s an adjustment made by economists to compare economic data over time by removing the noise caused by inflation or deflation. Imagine you want to know if your country produced more goods last year or if prices just went up. Without deflating, you couldn't know for sure. A deflator compares a period to a base year and shows you the real change in volume, not in price.

Let's look at a concrete example. Suppose a country produced 10 million euros worth of goods and services in Year 1, and in Year 2 it increased to 12 million. At first glance, that seems like a 20% growth, right? But if prices rose by 10% during that period, the reality is different. When you normalize the data considering that price increase, the real growth was only 10%. That’s what deflating means: obtaining real GDP instead of nominal.

This concept of the deflator applies in many areas. Economists use it constantly to analyze GDP, company sales, workers’ wages. They need to know if there’s real growth or just disguised inflation.

Now, what does this have to do with your wallet? This is where deflating the IRPF comes into play. When politicians talk about deflating income tax, they mean adjusting the tax brackets so that inflation doesn’t automatically push you into a higher tax category just because your nominal salary increased. If your salary goes up 3% but inflation is 5%, you’ve actually lost purchasing power. However, if the IRPF brackets aren’t adjusted, you end up paying more taxes on an income that’s actually lower in real terms.

In the US, France, and Nordic countries, this adjustment is made annually. Germany does it every two years. In Spain, at the national level, this adjustment hasn’t been made since 2008, although some autonomous communities have started implementing it in recent years. The idea behind it is clear: to protect taxpayers’ purchasing power during periods of high inflation.

Proponents of this measure argue that it’s essential to prevent families from losing buying capacity while fighting rising prices. Critics, on the other hand, point out that it disproportionately benefits the highest earners, given the progressive nature of the tax, and that it could also reduce government revenue needed to fund public services.

From an investor’s perspective, this has real implications. If IRPF is deflated, people would have more disposable income, which could boost demand for investments. In scenarios of high inflation and high interest rates, many seek refuge in assets like gold, real estate, or defensive stocks that cover basic needs. The stock market, although volatile at those times, can be attractive for those with a long-term horizon and available liquidity.

The key is to understand that a deflator isn’t just an academic term. It’s a tool that affects how the real economy is measured, how fiscal policies are designed, and ultimately, how your wealth and investment decisions are impacted. When you understand what a deflator is and how it works, you’ll better grasp why certain economic debates matter more than they seem at first glance.