Financemaidav Basics
How Inflation Changes Purchasing Power
Why the same euro buys a little less every year, how the inflation rate is measured and what that means for savings, wages and prices.
When prices rise, the same sum of money buys less. That sounds obvious, but over the years it becomes one of the most important variables in any financial plan. This article explains how the Federal Statistical Office measures the inflation rate in Germany, what target the European Central Bank pursues, how the loss of purchasing power can be calculated and what inflation means for savings, wages, debts and the way companies set their prices.
What the inflation rate measures
In Germany, the inflation rate is based on the consumer price index (Verbraucherpreisindex, VPI) compiled by the Federal Statistical Office (Destatis). It tracks the prices of a basket covering around 700 types of goods and services, from food and clothing to rents, train tickets and trips to the cinema. Each type enters the index according to its share of private household consumption expenditure. These weights are known as the weighting pattern (Wägungsschema) and are usually updated every five years; the current base year is 2020.
To measure prices, several hundred thousand individual prices are collected every month in shops and from service providers, partly on site and partly centrally. The inflation rate is then the change in the index compared with the same month of the previous year or, as an annual average, compared with the previous year.
Destatis also calculates the Harmonised Index of Consumer Prices, or HICP (HVPI in German). It follows uniform rules across Europe and makes price increases in the member states comparable. For the European Central Bank, the HICP for the euro area is the decisive measure. It does not yet include the costs of owner-occupied housing, although the ECB considers their inclusion desirable. Core inflation is also frequently cited: it excludes energy and food and is intended to show the underlying price trend.
The European Central Bank's target
The ECB aims for an inflation rate of 2 per cent over the medium term. Since its strategy review in 2021, it has explicitly regarded this target as symmetric: deviations below the target are considered just as undesirable as deviations above it. In its strategy assessment in 2025, the ECB Governing Council confirmed the target. The central bank explains that it is not set at zero partly because of measurement errors and partly because wages and prices are reluctant to fall, so a small buffer makes adjustments easier.
Recent years show how far reality can diverge from it. According to the Federal Statistical Office, the annual average inflation rate in Germany was 3.1 per cent in 2021, 6.9 per cent in 2022 and 5.9 per cent in 2023. In both 2024 and 2025 it was 2.2 per cent. Chaining these annual rates together gives a price level in 2025 that is a good fifth higher than in 2020.
Purchasing power in figures
The loss of purchasing power follows a simple formula: the future purchasing power of a sum equals the sum divided by (1 plus the inflation rate) to the power of the number of years. Because each year's price rise builds on a price level that has already risen, the effect grows disproportionately over time. The purchasing power calculator lets you try out your own amounts, rates and periods.
| Starting amount today | €10,000 |
|---|---|
| After 10 years at 2 % inflation | about €8,203 |
| After 20 years at 2 % inflation | about €6,730 |
| After 10 years at 3 % inflation | about €7,441 |
| After 20 years at 3 % inflation | about €5,537 |
The figures show purchasing power in today's euros, calculated with a constant annual rate, for example 10,000 divided by 1.02 to the power of 10. In this example, one percentage point more inflation costs almost 1,200 euros of purchasing power over 20 years.
A second calculation helps to put this in context: at 2 per cent inflation, the price level doubles in around 35 years, and at 3 per cent in just over 23 years. For a working life or for the years in retirement, these are highly relevant periods.
Real interest and real wages
Whether savings are actually growing is shown only by the real interest rate, that is the interest rate after deducting inflation. As an approximation, it is the difference between the nominal interest rate and the inflation rate. More precisely, you calculate (1 plus the nominal rate) divided by (1 plus the inflation rate), minus 1. An example with round assumptions: if a deposit earns 3 per cent interest with inflation at 2.2 per cent, the real interest rate before tax is around 0.8 per cent. If the interest rate is below the inflation rate, purchasing power shrinks despite the interest credited.
The same principle applies to income. The real wage describes what a pay rise actually delivers after price increases have been deducted. A rise of 3 per cent with inflation at 2.2 per cent means a real increase of just under 0.8 per cent. In years of high inflation, wages can rise in nominal terms and still fall in real terms.
Perceived and measured inflation
Many people feel that prices are rising faster than the official rate shows. One reason is that frequently bought goods such as food or fuel shape perception more strongly than rarely bought items such as electrical appliances, whose prices may move differently. In addition, the index reflects an average household. Anyone who does not drive, uses a lot of heating or rents in an expensive city has their own personal inflation rate.
The Federal Statistical Office offers a personal inflation calculator for this purpose, in which the weights of the basket can be adjusted to your own spending habits. It shows why neighbours can experience the same official inflation rate very differently.
Consequences for debt, real assets and companies
Inflation redistributes wealth. If you have a loan at a fixed interest rate, you repay it with money that has lost purchasing power, so the real value of the debt falls. This applies only to a limited extent to new loans, because interest rates usually rise when inflation is higher. Real assets such as property or shareholdings in companies can grow with prices, but they do not offer reliable protection, as their prices also fluctuate for other reasons.
For companies, inflation becomes a question of pricing. Rising purchase prices, energy costs and wages cannot always be passed on straight away, especially under long contracts. Some contracts therefore contain price adjustment or indexation clauses (Preisgleitklauseln, Wertsicherungsklauseln) that link payments to an index. Under the German Price Clause Act (Preisklauselgesetz), clauses that tie an amount directly and automatically to a price index are generally prohibited, although the act provides for a number of exceptions. For residential leases, section 557b of the German Civil Code (Bürgerliches Gesetzbuch, BGB) governs index-linked rents (Indexmiete). Expected inflation also plays a central role in wage negotiations.
Building inflation into your own planning
Individuals cannot prevent inflation, but they can plan for it. A few habits help to keep purchasing power in view:
- calculate long-term goals such as retirement or your children's education in terms of future purchasing power
- always look at returns on savings and investments after inflation and tax
- check fixed expenses and ongoing contracts for price changes once a year
- in a business, regularly compare price lists, costings and contract terms with the development of costs
Inflation works like compound interest in reverse: small in any single year, large over decades.
Moderate inflation is not a malfunction but something monetary policy explicitly aims for. Once you understand its effect, you read interest rate offers, wage settlements and price trends differently and plan with realistic figures. The formula is simple and its effect over long periods considerable, which is exactly why it pays to look at purchasing power rather than just the nominal amount.
Frequently asked questions
Why does personal inflation often differ from the official inflation rate?
The consumer price index reflects the spending patterns of an average household. Anyone who spends an above-average amount on energy, transport or food experiences different price rises from someone whose spending leans heavily towards electronics or leisure. The personal inflation calculator of the Federal Statistical Office lets you estimate your own rate approximately.
What is the difference between the CPI and the HICP?
The consumer price index (CPI, VPI in German) is the national measure of the Federal Statistical Office and is used, for example, for index-linked rents in Germany. The Harmonised Index of Consumer Prices (HICP) follows uniform rules across Europe so that member states can be compared. The European Central Bank refers to it for its price stability target. The two indices usually lie close together but can diverge.
How can the loss of purchasing power be calculated?
Divide the amount by (1 plus the inflation rate) to the power of the number of years. For 10,000 euros, 3 per cent inflation and 10 years, that gives 10,000 divided by 1.03 to the power of 10, or about 7,441 euros. The calculation assumes a constant rate; in reality, inflation varies from year to year.
Do borrowers benefit from inflation?
With fixed-rate loans, the real value of the outstanding debt falls, because it is repaid with money that buys less. By contrast, anyone paying a variable rate or taking out new financing usually faces higher interest rates when inflation is higher. Whether inflation works out favourably for borrowers overall therefore depends on the fixed-rate period, income and term.
Terms
- Consumer price index
- Index calculated by the Federal Statistical Office (Verbraucherpreisindex) that measures the average change in the prices of goods and services bought by private households in Germany.
- Purchasing power
- The quantity of goods and services that a given sum of money can buy at a particular point in time.
- Real interest rate
- The interest rate after deducting the inflation rate, which shows whether a deposit gains or loses purchasing power.
Sources
- Verbraucherpreisindex (VPI) (in German)Federal Statistical Office (Destatis)
- Inflation rate at +2.2% in 2025, press release No. 019 of 16 January 2026Federal Statistical Office (Destatis)
- The ECB's monetary policy strategy statement (2025)European Central Bank
- Preisklauselgesetz, § 1 Preisklauselverbot (in German)Bundesministerium der Justiz
- Bürgerliches Gesetzbuch, § 557b Indexmiete (in German)Bundesministerium der Justiz
Image: illustration, created with AI.
