Property tax up 52% in 10 years: how does it change buy or rent decisions?

Property tax +52% in 10 years: a game changer for buy or rent decisions

Over the last decade, French property tax (taxe foncière) has increased by roughly +52% on average. In some large cities, the jump is even higher, above +70%. This surge directly affects any serious buy or rent calculation and cannot be ignored.

Two specific parameters in the buy-or-rent.net / acheter-ou-louer.com simulator capture this impact:

• taxe_fonciere_annuelle: the annual property tax in year 1
• taux_revalorisation_taxe_fonciere_annuelle: the yearly increase rate of this tax

Underestimating these two inputs means underestimating the real cost of owning, especially in a context of fast local tax increases.

1. What does +52% in 10 years really mean?

1.1. From 52% in 10 years to an annual growth rate

A +52% increase over 10 years corresponds to an average annual growth rate of about:

annual rate ≈ (1.52)^(1/10) − 1 ≈ 4.3% per year

In other words, a tax that used to grow by 1–2% per year is now often rising at 4–5% per year, driven by:

• revaluation of cadastral bases
• higher tax rates decided by local authorities
• general inflation (2–5% in recent years)

With mortgage rates around 3.6% and annual inflation around 2–3%, property tax is now a cost item that can grow faster than both your income and your debt cost.

1.2. Huge differences between cities

The starting value of taxe_fonciere_annuelle varies widely, from less than €500 per year to more than €5,000 for large or high-end properties, or in heavily taxed municipalities. Typical ranges for a mid-size flat or house:

• Low-tax city: €450–800 / year
• Average city: €1,000–1,800 / year
• High-tax city: €2,000–3,500 / year
• Large / premium property: €3,500–5,000+ / year

Over 20–25 years, the combination of the initial level (taxe_fonciere_annuelle) and the taux_revalorisation_taxe_fonciere_annuelle can easily add up to the equivalent of several years of rent.

2. How property tax fits into the buy or rent equation

2.1. Other key simulator parameters

Comparing buy or rent is not just about "monthly mortgage vs monthly rent". The simulator also includes:

• Loan rate (~3.6%): interest cost
• Notary fees: 7–8% on existing properties, 2–3% on new builds
• Agency fees: often 3–5% of the price
• Borrower insurance rate: around 0.25–0.45% of the loan amount
• Renovation cost (montant travaux): including energy upgrades and DPE-related works
• Property tax (taxe_fonciere_annuelle) and its annual increase rate
• Annual rent increase: linked to the IRL rental index
• Investment rate (taux de placement): return if you invest while renting (savings, ETFs, etc.)
• Annual inflation: erosion of purchasing power

Property tax is one of the clearest differences between owners and tenants: tenants usually do not pay it directly (with a few exceptions), whereas owners pay it every year, on top of maintenance, home insurance and non-recoverable building charges.

2.2. A simple model for property tax over time

Let’s define:

• T0 = taxe_fonciere_annuelle (year 1)
• g = taux_revalorisation_taxe_fonciere_annuelle
• n = number of years

Then property tax in year n is:

T(n) = T0 × (1 + g)^(n − 1)

And the cumulative total over n years is approximately:

Total ≈ T0 × [(1 + g)^n − 1] / g

The buy-or-rent.net simulator uses this logic to project the future cost of ownership, including property tax.

3. Numerical example: a flat with fast-rising property tax

3.1. Initial assumptions

Consider this realistic buy or rent scenario:

• Purchase price: €300,000 (existing property)
• Mortgage: 25 years at 3.6%
• Borrower insurance: 0.30% of the principal
• Notary fees: 8% (€24,000)
• Agency fees: 4% (€12,000)
• Taxe_fonciere_annuelle: €1,500 in year 1
• Taux_revalorisation_taxe_fonciere_annuelle: 4.5% per year
• Inflation: 2.5% per year
• Investment rate if renting: 4.0% per year
• Equivalent rent: €1,200 / month, indexed to IRL at 2.5% per year

3.2. Property tax projection over 10 years

With a 4.5% annual increase:

• Year 1: €1,500
• Year 5: 1,500 × (1.045)^4 ≈ €1,785
• Year 10: 1,500 × (1.045)^9 ≈ €2,280

Cumulative total over 10 years:

Total ≈ 1,500 × [(1.045)^10 − 1] / 0.045 ≈ 1,500 × 12.3 ≈ €18,450

So after 10 years, the owner will have paid roughly €18–19k in property tax, in addition to mortgage payments and other housing costs. That is broadly consistent with a context where average property tax has risen +52% in 10 years.

3.3. Comparison with the tenant

The tenant pays €1,200 per month, with rent indexed at 2.5% per year. Over 10 years:

Total rent ≈ 1,200 × 12 × [(1.025^10 − 1) / 0.025] ≈ 14,400 × 11.0 ≈ €158,400

Meanwhile, the owner pays:

• monthly mortgage (principal + interest)
• initial costs (notary + agency fees)
• property tax (≈ €18,450 over 10 years)
• borrower insurance
• maintenance and possible renovations

In return, the owner builds equity: after 10 years, a significant share of the principal is repaid (often 20–30% of the price, depending on the amortization profile), and the property may have appreciated, say 1–2% per year (highly market-dependent). The tenant, on the other hand, can invest:

• the initial cash not used for buying (no notary or agency fees, no down payment)
• any gap between the would-be mortgage payment and the actual rent

With a 4–5% investment rate over the long run (for example via ETFs), compounded returns may offset some of the benefits of owning. In this comparison, not paying property tax as a tenant effectively increases the amount that can be invested.

4. Two contrasting scenarios: low vs high property tax growth

4.1. Scenario 1: moderate growth (2% per year)

Case 1, in a relatively low-tax city:

• Taxe_fonciere_annuelle: €800 (year 1)
• Taux_revalorisation_taxe_fonciere_annuelle: 2% per year

Over 20 years:

• Year 20: 800 × (1.02)^19 ≈ €1,160
• Total ≈ 800 × [(1.02)^20 − 1] / 0.02 ≈ 800 × 24.3 ≈ €19,440

After 20 years, cumulative property tax is around €20k. For a €250k property, this is roughly 8% of the purchase price over the holding period: significant, but not necessarily decisive on its own.

4.2. Scenario 2: strong growth (5% per year)

Case 2, in a heavily taxed municipality:

• Taxe_fonciere_annuelle: €2,000 (year 1)
• Taux_revalorisation_taxe_fonciere_annuelle: 5% per year

Over 20 years:

• Year 20: 2,000 × (1.05)^19 ≈ €5,050
• Total ≈ 2,000 × [(1.05)^20 − 1] / 0.05 ≈ 2,000 × 33.1 ≈ €66,200

This time, cumulative property tax exceeds €66k over 20 years – comparable to:

• a substantial down payment for another purchase
• or several years of rent in many markets

In such locations, property tax is a central input in the buy or rent decision, especially over 10–20 years.

5. Interactions with loan rate, inflation and investments

5.1. Loan rate vs property tax growth

With mortgage rates around 3.6% and inflation at 2–3%, part of the real cost of debt is eroded by inflation. But if property tax grows at 4–5% annually, it:

• outpaces income if salaries follow inflation only
• can grow faster than rents, which usually follow IRL and inflation

That means owners face a cost that can increase faster than their purchasing power, while tenants mainly face rent increases that tend to track inflation more closely.

5.2. Investment rate if you keep renting

If you decide not to buy, you can:

• invest the cash you would have used for down payment, notary and agency fees
• potentially invest any difference between a high mortgage payment and a lower rent

At a long-term investment rate of 4–5% (for example a diversified ETF portfolio), compound interest can be powerful. In this framework, not paying property tax as a tenant means more free cash that can be invested – an important element in long-term wealth comparisons between buying and renting.

6. Using the simulator: focus on taxe_fonciere_annuelle and its increase

6.1. Entering a realistic taxe_fonciere_annuelle

On buy-or-rent.net (or acheter-ou-louer.com), start by:

• retrieving the actual property tax bill for the property you own or target
• or asking the seller / agent for an estimate
• entering this figure in the taxe_fonciere_annuelle field

If you compare several cities or neighborhoods, run one simulation per location. Differences in property tax levels alone can tilt the buy or rent balance.

6.2. Testing different taux_revalorisation_taxe_fonciere_annuelle

Next, vary the taux_revalorisation_taxe_fonciere_annuelle to reflect different policy and inflation scenarios:

• Conservative scenario: 2% per year
• Realistic scenario: 3.5–4.5% per year (close to +52% over 10 years)
• Stress scenario: 5–6% per year in high-debt or high-spending municipalities

Watch how the simulator’s results change: in some situations, fast-growing property tax can delay the break-even point where buying becomes more attractive than renting, or even make renting preferable over your expected holding period.

6.3. Combine with other parameters for a full picture

To get a robust view, combine your property tax assumptions with:

• different loan rates (e.g. 3.2%, 3.6%, 4.0%)
• various investment rates (2%, 4%, 6%)
• renovation cost scenarios (including energy retrofit, which can also influence property value and sometimes tax treatment)
• different rent increase rates (depending on IRL and local market dynamics)

This is exactly what the simulator is designed for: to quantify, rather than guess, how all these flows shape your buy or rent outcome.

7. Key takeaways on the 52% property tax increase

• Average property tax has risen about +52% in 10 years, or roughly 4–5% per year.
• Taxe_fonciere_annuelle ranges from €500 to over €5,000 per year depending on city and property type.
• The taux_revalorisation_taxe_fonciere_annuelle is crucial over 15–25 years: at 5% per year, cumulative tax can exceed €60k.
• This cost is borne only by owners, while tenants mainly face rent indexed to IRL.
• The real impact must be weighed against other parameters: loan rate, inflation, investment returns, buying costs and renovation needs.

There is no universal answer to whether it is better to buy or rent: it depends on your city, holding period, local tax policy, savings capacity and investment assumptions. This article is for information only and does not constitute personalised financial advice.

To understand how the +52% property tax trend affects your own situation, adjust taxe_fonciere_annuelle and taux_revalorisation_taxe_fonciere_annuelle in the simulator and compare scenarios. Simulate your situation on buy-or-rent.net.