Inflation by country: how it shapes the buy or rent decision

Why inflation by country reshapes the buy or rent decision

Between 2021 and 2023, annual inflation ranged from about 2% to over 10% across European countries. This doesn’t just change your grocery bill: it fundamentally alters the buy or rent calculation. In a country where annual inflation is 2%, the optimal strategy is not the same as in a country at 8–10%.

The buy-or-rent.net simulator includes a key parameter: inflation_annuelle (annual inflation). This is what drives projections for purchasing power erosion, rent increases, ownership costs and the performance of alternative investments. Understanding inflation by country is therefore essential before deciding whether to buy or rent.

Inflation_annuelle: a core parameter in the simulator

In the tool, inflation_annuelle is the average consumer price inflation (CPI) in the country where you live. With 4% inflation for example:

• a 1,000 € basket of goods costs 1,040 € the following year;
• your income needs to rise by at least 4% just to maintain the same standard of living;
• rents, property tax, maintenance and renovation costs tend to move in the same direction, with some lag.

When you simulate buy or rent, inflation_annuelle influences several other parameters:

• Annual rent increase: often indexed to an official rent index, itself closely linked to inflation in many European countries.
• Property tax revaluation: local authorities regularly adjust tax bases and rates, often faster when inflation is high.
• Notary fees, renovation, insurance: all these costs broadly follow the general rise in prices.
• Investment rate: in high‑inflation countries, investments must deliver higher nominal returns just to preserve your capital in real terms.

Two countries with the same price per square meter but different inflation_annuelle can lead to very different outcomes in a buy or rent simulation.

Comparing two countries: low vs high inflation

Scenario 1: Country A with 2% annual inflation

Assumptions:

• Purchase price (apartment): 300,000 € (existing stock)
• Loan rate: 3.6% over 25 years
• Notary fees: 8%, i.e. 24,000 €
• Agency fees: 4%, i.e. 12,000 €
• Borrower insurance rate: 0.30%
• Equivalent rent if you rent: 1,300 €/month
• Annual rent increase: 2% (close to inflation_annuelle)
• Property tax: 1,200 €/year, revalued by 2%/year
• Investment rate if renting: 3.5%/year
• Inflation_annuelle: 2%

Here, the gap between the investment rate (3.5%) and inflation (2%) is +1.5% in real terms. The capital you invest as a tenant grows faster than prices. At the same time:

• your rent increases moderately (2%/year);
• ownership costs (property tax, maintenance, insurance) also rise around 2%/year;
• your loan payment is fixed in nominal euros, so in real terms it becomes slightly lighter each year.

In a moderate‑inflation environment, the buy or rent decision depends heavily on:

• your ability to secure a good investment rate (ETFs, index funds, etc.);
• income stability;
• the probability of an early resale (and thus suffering prepayment penalties and poorly amortised upfront costs).

Scenario 2: Country B with 8% annual inflation

Keep the same starting prices, but change inflation dynamics:

• Purchase price: 300,000 €
• Loan rate: 3.6% (assumed stable for comparison)
• Notary fees: 8%
• Equivalent rent: 1,300 €/month initially
• Inflation_annuelle: 8%
• Annual rent increase: 7% (indexation close to inflation)
• Property tax revaluation: 7%/year
• Investment rate: 9%/year (higher nominal returns but more volatility)

In this country, the situation is radically different:

• Your 1,300 € rent reaches about 2,558 €/month after 10 years (1,300 × 1.07¹⁰ ≈ 2,558 €).
• Your 1,200 € property tax climbs to about 2,360 €/year (1,200 × 1.07¹⁰).
• Your mortgage payment stays fixed in euros, which means that in real terms it becomes much lighter over time: with 8% inflation, a 1,500 € payment has half the purchasing‑power weight after roughly 9 years.

If your investment rate is only 5% while inflation runs at 8%, your savings lose value in real terms. In a high‑inflation country, renting can become very expensive over the long term if:

• rents track inflation closely; and
• your investments do not keep pace with currency erosion.

The same buy or rent simulation can therefore produce opposite conclusions between Country A and Country B, driven mainly by different inflation_annuelle assumptions.

How inflation by country affects each component of the calculation

Rent: hedge or inflation trap?

In most European countries, annual rent increases are regulated and linked to an index built on inflation. Simplified examples:

• Country with 2% inflation: starting rent 1,000 €/month, +2%/year → about 1,219 €/month after 10 years.
• Country with 6% inflation: same starting rent, +6%/year → about 1,791 €/month after 10 years.

After ten years, the gap exceeds 570 €/month. In a high‑inflation country, staying a tenant without equivalent wage growth can become financially painful. In the simulator, adjusting inflation_annuelle lets you see how rents drift over 15, 20 or 25 years.

Ownership costs: property tax, maintenance and insurance

Owning a home does not shield you from inflation. Several key items are directly exposed:

• Property tax (anywhere from about 450 € to over 5,000 €/year depending on the city): often revalued annually, sometimes faster than inflation, especially in large metropolitan areas.
• Renovation cost: materials and labour generally follow or exceed inflation. An energy retrofit costing 30,000 € today could cost around 36,000 € in a 6%‑inflation country after just three years (30,000 × 1.06³).
• Home and borrower insurance (insurance rate around 0.25–0.45%): premiums rise with the cost of claims (materials, labour, compensation).

In high‑inflation countries these items rise quickly, but at the same time the nominal value of your property may also increase. The key question in the buy or rent decision becomes: do your ownership costs grow faster or slower than rents and your income?

Mortgage debt: a potential ally in sustained inflation

When the loan rate (say 3.6%) is below or close to inflation_annuelle, long‑term fixed‑rate debt can work in your favour in real terms:

• You repay the bank with money that buys less every year.
• Your monthly payment is fixed while your salary may be adjusted upward (at least partially) with inflation.

Simple example:

• Country C: inflation_annuelle 5%, loan rate 3.6%, monthly payment 1,500 €.
• After 10 years, with 5% inflation, 1,500 € is equivalent to roughly 920 € in today’s purchasing power (1,500 / 1.05¹⁰).

In that kind of country, buying can be an inflation hedge, provided you stay long enough to amortise:

• Notary fees (7–8% for existing homes, 2–3% for new builds);
• Agency fees (typically 3–5%);
• possible prepayment penalties if you sell or refinance early (often capped at 3% of remaining principal or 6 months’ interest).

Inflation and investments: renting to invest, but in what environment?

The classic argument for renting is: “I rent cheaper than owning, and I invest the difference.” This only holds if your investment rate net of fees and tax exceeds your country’s inflation_annuelle.

Compare two 20‑year scenarios, assuming renting saves you 500 €/month compared to owning and you invest this difference:

• Country with 2% inflation, investment rate 5%:
  • future capital ≈ 500 × ((1.05²⁰ − 1) / 0.05) ≈ 500 × 33.06 ≈ 16,5300 €;
  • cumulative inflation ≈ 1.02²⁰ ≈ 1.49 → real capital ≈ 111,000 €.
• Country with 7% inflation, investment rate 8%:
  • future capital ≈ 500 × ((1.08²⁰ − 1) / 0.08) ≈ 500 × 45.76 ≈ 22,8800 €;
  • cumulative inflation ≈ 1.07²⁰ ≈ 3.87 → real capital ≈ 59,000 €.

In the second country, your nominal capital is higher, but your real purchasing power is much lower. In a high‑inflation context, the “rent and invest” strategy only beats buying if your investments significantly outpace inflation_annuelle – and you accept the associated risk.

International comparison: same salary, different inflation, different choices

Imagine two people each earning a net salary of 3,000 €/month:

• Person 1 lives in a country with 2% inflation_annuelle.
• Person 2 lives in a country with 8% inflation_annuelle.

Both are considering whether to buy or rent a 70 m² home, with a starting rent of 1,200 € and a purchase price of 280,000 €.

• In the 2%‑inflation country, the rent‑to‑income ratio remains relatively stable if salaries and rents move at similar speeds.
• In the 8%‑inflation country, if wages lag behind inflation, rent can eat up a growing share of income, while a fixed mortgage payment becomes relatively cheaper over time.

Over 15–20 years, the same starting situation can produce very different outcomes in a buy or rent simulator, purely because of different inflation by country profiles. This is why setting the inflation_annuelle parameter correctly is critical.

How to use inflation_annuelle in the simulator

To use buy-or-rent.net effectively in an international context:

• Enter a realistic inflation_annuelle for your country (use a 5–10‑year average, not just the latest spike).
• Check that your annual rent increase assumption is consistent with national data (official rent index or CPI).
• Adjust property tax revaluation based on local practice (some cities increase rates faster than inflation).
• Choose a realistic investment rate for your country (savings accounts, bonds, ETFs) and compare it to inflation_annuelle.

Then run several scenarios:

• Stable inflation (e.g. 2%);
• Persistently high inflation (5–8%);
• Temporary spike followed by normalisation (e.g. 6% for 3 years, then 2%).

You will see the buy or rent frontier move significantly as you change these assumptions.

Conclusion: inflation by country as a pivot of the buy or rent choice

Inflation by country is not an abstract macroeconomic detail: it is a concrete driver of your buy or rent decision over 10, 20 or 25 years. Whether you live in a 2%, 5% or 8% inflation environment, the effects differ sharply:

• rents may remain manageable or become explosive;
• property tax and renovation costs may take a growing slice of your budget;
• a fixed‑rate mortgage can be an inflation shield, or a burden if rates and prices outpace your income;
• the “rent and invest” approach only works if your investments truly beat your country’s inflation_annuelle.

There is no universal answer: buy or rent always depends on your situation, your time horizon, your country and your risk tolerance. This article is for information only and does not constitute personalised financial advice.

To see exactly how inflation by country affects your numbers, adjust the inflation_annuelle and other parameters in the simulator: Simulate your situation on buy-or-rent.net.