Rate Increases: How Do They Impact Your Buying Power?

Why Rising Rates Shrink Your Buying Power

Since 2021, the average mortgage rate in Europe has climbed from around 1.2% to roughly 3.6% in early 2026. This rate increase has a mechanical effect: for the same monthly payment, you can borrow less. Your buying power goes down even if your income stays the same.

Understanding this impact is essential when you ask whether you should buy or rent. Our simulator on buy-or-rent.net (acheter-ou-louer.com) explicitly uses the taux_pret (loan rate) parameter to show how a loan at 2.5%, 3.6% or 4.5% changes your property budget.

How the loan rate drives your monthly payment

A mortgage payment is determined by three key elements:

• Loan amount (principal)
• Term (e.g. 20 or 25 years)
• Loan rate (taux_pret in the simulator)

The basic formula for the monthly payment (without insurance) is:

Payment = P × [ i / (1 − (1 + i)⁻ⁿ ) ]

• P = principal
• i = monthly rate (annual rate / 12)
• n = total number of monthly payments

When the taux_pret rises, i goes up, so the payment increases for the same principal and term. If your bank caps your debt-to-income ratio at 35%, a higher rate forces you to borrow less. That is the direct hit on your buying power.

Example 1: same payment, higher rate

Take a household with net income of €4,000 per month. Maximum housing payment at 35%: €1,400 per month (ignoring insurance for simplicity).

We compare a 25-year loan (300 months) in two rate environments:

• Scenario A: taux_pret = 1.5%
• Scenario B: taux_pret = 3.6%

Scenario A: 1.5% loan rate

Monthly rate i = 1.5% / 12 ≈ 0.125% = 0.00125.

Reversing the formula to find the maximum principal P for a €1,400 payment over 300 months gives:

P ≈ €363,000 (order of magnitude).

Scenario B: 3.6% loan rate

Monthly rate i = 3.6% / 12 = 0.3% = 0.003.

With the same €1,400 payment over 300 months:

P ≈ €305,000 (order of magnitude).

Impact of the rate increase on buying power

• At 1.5%: borrowing capacity ≈ €363,000
• At 3.6%: borrowing capacity ≈ €305,000

Loss of buying power: roughly €58,000, or about 16%. And this is before including closing costs and agency fees.

In real life, this can mean:

• dropping from a recent 3-bedroom to an older 2-bedroom,
• moving 15–30 minutes further from the city center,
• or giving up on outdoor space (balcony, garden).

On buy-or-rent.net, the taux_pret parameter lets you model both scenarios in seconds and see how the rate increase reshapes your buying budget versus renting.

Example 2: same purchase price, payment jumps

Another way to measure the impact of a rate increase is to keep the purchase price constant and see how the payment changes.

Assume a property worth €300,000 (excluding fees), financed over 25 years.

At 1.5% taux_pret

• P = €300,000
• i = 0.00125
• n = 300

Monthly payment ≈ €1,160 (no insurance).

At 3.6% taux_pret

• P = €300,000
• i = 0.003
• n = 300

Monthly payment ≈ €1,520 (no insurance).

Concrete difference

• +€360 per month
• +€4,320 per year
• well over €100,000 in extra payments over 25 years

This is where the buy or rent question becomes critical: is a €1,520 mortgage payment really justified if you can rent a similar home for, say, €1,250? The answer depends on your income, your time horizon and your ability to invest the savings if you stay a renter.

Rate increases and total interest cost

The taux_pret does not just shrink your buying power; it also changes the total amount of interest you pay.

Example: €300,000 borrowed over 25 years

• At 1.5%: payment ≈ €1,160
  Total interest ≈ €48,000
• At 3.6%: payment ≈ €1,520
  Total interest ≈ €156,000

Extra interest due to higher rate: roughly €108,000.

Over the long run, this difference can be compared with the potential return of a financial investment if you chose to rent and invest your capital instead (the investment rate parameter in the simulator).

Buying power, down payment and extra costs

Your buying power is driven by more than just the taux_pret. In a high-rate environment, lenders pay close attention to:

• Your down payment (often at least 10%)
• Closing costs (notary fees, 7–8% for existing properties, 2–3% for new builds)
• Agency fees (typically 3–5%)

For an existing property at €300,000 with 7.5% closing costs and 4% agency fees:

• Notary / closing costs ≈ €22,500
• Agency fees ≈ €12,000
• Total cost ≈ €334,500 (before renovations)

If your down payment only covers these fees, you are effectively financing the full €300,000 purchase price. With a high taux_pret, your payment rises even more, further reducing your buying power. In some cases, staying a renter for a few more years to build a larger down payment can significantly change the buy or rent comparison.

Rate increases and the buy or rent decision

The real question is not simply “buy or rent?” but rather: “buy now with a taux_pret around 3.6%, or rent and invest the difference?”

Scenario A: you buy

• Higher mortgage payment because of the rate increase
• Immediate outlay for closing and agency fees
• Annual property tax (often rising over time)
• Maintenance and renovation costs

In return, you build home equity and may benefit from market appreciation, though that is never guaranteed.

Scenario B: you rent

• Monthly rent (with annual increases linked to a rent index)
• No property tax
• No major structural repairs to pay
• Ability to invest your initial capital and part of your income (investment rate)

With a high taux_pret, the gap between mortgage payment and rent can be significant. If you can rent for €1,200 while the mortgage on the same home would cost €1,600, you could, in theory, invest €400 per month. At a 4% annual investment return over 20 years, that represents more than €145,000 of potential savings.

Depending on future property prices, rent levels, inflation and interest rates, the best financial choice can swing either way. That is why you should rely on numbers, not rules of thumb, when you evaluate whether to buy or rent.

The key role of the simulator when rates move

Our tool on buy-or-rent.net (acheter-ou-louer.com) lets you adjust the taux_pret parameter to:

• test a purchase with today’s rate (around 3.6%)
• see the impact of potential future rate cuts or hikes
• measure your maximum buying power given your income
• compare the long-term cost of buying versus renting + investing

For example, you can simulate:

• buying now with a 3.6% rate over 25 years,
• buying in 3 years with a hypothetical 3.0% rate but 5% higher prices,
• and staying a renter while investing your savings in the meantime.

The simulator does not just account for taux_pret. It also includes: property tax and its revaluation, annual rent increases, notary and agency fees, renovation costs, inflation and the expected return on your investments.

Rate increases: should you give up on buying?

There is no one-size-fits-all answer. Rising rates do reduce your buying power, but that does not automatically mean you should abandon the idea of becoming a homeowner. It depends on:

• your time horizon (5, 10, 20 years)
• the stability of your income
• your savings capacity
• your local market (prices, rents, property tax)
• your risk tolerance (real estate vs financial assets)

This article is for informational purposes only and does not constitute personalized financial advice. For decisions tailored to your specific situation, you should consult a qualified professional.

To make an informed buy or rent decision in a context of rising rates, the most robust approach is to test several scenarios with different loan rates and assumptions.

Simulate your situation on buy-or-rent.net and see, in concrete numbers, how rate increases affect your buying power.