First-time buyer: the complete guide to your first home

First-time buyer: where should you start?

Becoming a homeowner for the first time always raises the same core question: is it financially better to buy or rent in your specific case? For a first-time buyer, three financial parameters matter more than anything else: the loan rate (taux_pret), the amount of your down payment (montant_fn) and the borrower insurance rate (taux_assurance). This guide breaks them down with concrete numbers, in a clear comparison framework.

This article is not personalized financial advice. All examples are simplified. To see how the numbers play out for you, use a dedicated calculator such as the buy-or-rent.net simulator.

1. Loan rate (taux_pret): the number one lever for first-time buyers

1.1. Where are mortgage rates now?

In 2024–2025, fixed mortgage rates for good first-time buyer profiles are typically around 3.5–3.8% over 20 years, with about 3.6% as a reasonable benchmark. A 0.5 percentage point difference can materially change the result of your buy or rent simulation.

1.2. Numeric example: same purchase, different rates

Assume you are a first-time buyer looking at a first home purchase at €250,000 in the existing housing market.

• Purchase price: €250,000
• Notary fees (older property, ~7.5%): €18,750
• Down payment (montant_fn): €25,000 (10% of price)
• Loan amount: €243,750
• Term: 20 years (240 months)

Compare two loan-rate scenarios, excluding insurance:

• Scenario A: taux_pret = 3.1%
• Scenario B: taux_pret = 3.6%

Using the standard amortizing loan formula (rounded):

• At 3.1% over 20 years, monthly payment ≈ €1,360
• At 3.6% over 20 years, monthly payment ≈ €1,420

Difference: about €60 per month, or roughly €14,400 over 20 years. That small change in taux_pret can tilt the outcome of a buy or rent analysis.

1.3. Impact on the buy or rent comparison

Imagine that renting an equivalent property costs €1,150 per month, with an annual rent increase aligned with the rental index (IRL), say 2% per year on average.

• Year 1: €1,150
• Year 10 (at +2%/yr): about €1,402
• Year 20: about €1,712

In the early years, the mortgage payment (1,360–1,420 + insurance + property tax) may look higher than the rent. But over time, rent tracks the index while your mortgage payment is fixed (ignoring insurance and tax changes). The taux_pret therefore drives:

• Your initial monthly effort versus renting
• The total interest cost over 20–25 years
• The relative performance versus investing if you stay a tenant

In a buy or rent calculator, changing taux_pret by ±0.5 percentage point can sometimes flip the final result for a first-time buyer.

2. Down payment (montant_fn): not just “how much”, but “at what opportunity cost”

2.1. Minimum vs comfortable down payment

For a first-time purchase, banks typically like to see a down payment that at least covers transaction and guarantee costs, often around 10% of the price. But the real question isn’t only “how much can you put down?”, it’s “what return are you giving up by locking that money into real estate instead of financial assets?”

If you keep renting, your savings could be invested at an investment rate (ETFs, mutual funds, savings accounts) of, say, 4% per year before tax. In a buy or rent simulation, the calculator compares:

• The net value of your home equity at resale (price − remaining loan − costs)
• The future value of your savings if you had rented and invested the difference between rent and mortgage plus your original down payment

2.2. Example: 10% vs 20% down

Back to our €250,000 property:

• 10% down: €25,000
• 20% down: €50,000

With 20% down, you borrow €218,750 instead of €243,750. At 3.6% over 20 years:

• 10% down: monthly payment excl. insurance ≈ €1,420
• 20% down: monthly payment excl. insurance ≈ €1,275

That’s about €145 per month less. Over 20 years, roughly €34,800 in lower cash outflow. But you’ve tied up an extra €25,000 in the property.

If those €25,000 stayed invested at 4% per year for 20 years, they could grow to:

• Future value ≈ 25,000 × (1.04^20) ≈ €54,800

So “more down payment” doesn’t automatically mean “better decision”: it depends on your potential investment rate as a renter, your taux_pret, and how long you’ll keep the property. A quantitative comparison is the only way to see the trade-off clearly.

2.3. Down payment and risk profile of a first-time buyer

For a first-time buyer, increasing montant_fn can:

• Help you secure a better taux_pret
• Reduce the cost of borrower insurance because the insured capital is lower
• Allow a shorter loan term, cutting total interest costs

But it also reduces your financial safety buffer for unexpected events (repairs, job loss, higher property tax). A common rule of thumb is to keep at least 3–6 months of expenses in cash savings before maximizing your down payment. A buy or rent simulator lets you test how different down-payment levels affect your overall financial picture.

3. Borrower insurance rate (taux_assurance): the hidden cost

3.1. What does borrower insurance cover?

Borrower insurance usually covers death, disability, and incapacity, sometimes unemployment. For a first-time buyer, it’s practically mandatory if you want a mortgage. Its cost is expressed as an annual rate, often between 0.25% and 0.45% of the loan amount for a young, healthy borrower.

3.2. Example: insurance cost over 20 years

Take our €243,750 loan over 20 years:

• taux_assurance: 0.30% of the original principal, calculated on a flat base

Annual premium ≈ 243,750 × 0.30% = €731 per year, or about €61 per month. Over 20 years, that’s 731 × 20 = €14,620.

If you secure 0.20% instead of 0.30% via insurance delegation:

• Annual premium ≈ €487
• Total over 20 years ≈ €9,740

Potential saving: almost €4,900. In a buy or rent comparison, that can offset a slightly higher taux_pret or make buying more competitive versus renting.

3.3. Age and health: key for first-time buyers

The younger you are when you make your first purchase, the lower your taux_assurance is likely to be (health permitting). A 28-year-old first-time buyer with no medical issues might get 0.20–0.25%, whereas a 45-year-old could face 0.35–0.45% or more.

On a €250,000 loan, a 0.2 percentage point difference often translates into several thousand euros. In your buy or rent simulation, don’t underestimate this line item and test several taux_assurance assumptions.

4. Buy or rent: a full worked example for a first-time buyer

4.1. Base assumptions

Imagine a first-time buyer hesitating between buying and renting a 60 m² flat in a major city.

• Purchase price (existing property): €280,000
• Notary fees (~7.5%): €21,000
• Down payment (montant_fn): €30,000
• Loan amount: €271,000
• Term: 25 years
• taux_pret: 3.6%
• taux_assurance: 0.30%
• Current rent for similar flat: €1,200/month
• Annual rent increase: 2%/year
• Investment rate if renting: 4%/year
• Property tax: €1,200/year, +2%/year

4.2. First-year monthly cost of buying

For €271,000 over 25 years at 3.6%:

• Monthly payment excl. insurance ≈ €1,370
• Insurance (0.30%): 271,000 × 0.30% / 12 ≈ €68/month
• Total mortgage + insurance ≈ €1,438/month

Add property tax:

• Property tax: €1,200/year ≈ €100/month
• Total housing cost ≈ €1,538/month (excluding service charges and maintenance)

Compare that with the rent of €1,200/month in year 1. Cash-flow difference: about €338/month against buying at the start.

4.3. How it evolves over 10–20 years

With rent growing 2% per year, after 10 years:

• Rent ≈ 1,200 × (1.02^10) ≈ €1,463/month

The mortgage payment stays at €1,438, while property tax also grows (say +2%/year). After around 10 years, the gap between buying and renting narrows and may reverse, especially if rent inflation outpaces property tax and general inflation.

Meanwhile:

• As an owner, you have built equity by repaying principal
• As a renter, you may have grown your investments (down payment + monthly savings) at 4% per year

The best option for a first-time buyer will differ depending on:

• How long you plan to stay (5 years vs 20 years)
• The actual return on your investments
• Local rent and property price trends

5. How to use a simulator for your first home decision

5.1. Key parameters to enter

For a realistic buy or rent comparison, a first-time buyer should carefully input at least:

• taux_pret: fixed interest rate and loan term
• montant_fn: effective down payment (keeping some emergency savings)
• taux_assurance: annual insurance rate and type of contract
• Purchase price and notary fees (7–8% for existing, 2–3% for new build)
• Current rent and assumed annual rent increase (linked to IRL)
• Expected investment rate if you stay a tenant
• Annual property tax and expected yearly increase

The buy-or-rent.net simulator lets you adjust these inputs and see how your projected net wealth looks at 10, 15 or 20 years in each scenario.

5.2. How to read the results realistically

A result such as “buying is €35,000 better after 20 years” does not mean you must buy; it simply means that, under the assumptions you entered, owning the home yields €35,000 more net wealth than renting and investing.

As a first-time buyer, also ask qualitative questions:

• Do you expect to stay in the same area for 10+ years?
• Are you willing to handle maintenance and repairs?
• Can you live with tighter cash flow in the early years?

The simulator is a decision-support tool, not an oracle.

6. Specific watchpoints for first-time buyers

6.1. Extra costs not to forget

Beyond taux_pret, montant_fn and taux_assurance, make sure you include:

• Bank fees (application/origination)
• Loan guarantee costs (mortgage or guarantee fund)
• Agency fees (often 3–5% if paid by the buyer)
• Renovation and energy upgrade costs, especially with poor energy ratings
• Home insurance, usually more comprehensive for owners than for tenants

These can materially affect the outcome of your buy or rent comparison.

6.2. Early repayment penalties if you sell quickly

If you sell before the end of the loan, prepayment penalties may apply (in many markets, often capped at 3% of remaining principal or 6 months’ interest, whichever is lower). For a mobile first-time buyer (career moves, family changes), this is crucial.

Example: remaining balance of €200,000 at 3.6%:

• 6 months’ interest ≈ 200,000 × 3.6% × 0.5 = €3,600
• 3% of remaining principal = €6,000

The maximum penalty would be €3,600 in this case. A good buy or rent calculator can factor this in if you plan to sell after only 7–8 years.

Conclusion: for first-time buyers, the numbers come first

For your first home purchase, three financial levers shape your decision: the loan rate (taux_pret), the down payment (montant_fn) and the borrower insurance rate (taux_assurance). Together they determine:

• Your monthly cash flow and comfort level
• The total cost of ownership over 20–25 years
• The outcome of a data-driven buy or rent comparison versus investing

The better choice depends on your personal situation (job stability, risk tolerance, time horizon) and on market assumptions (rates, rents, property prices). This guide is not individualized financial advice.

To make an informed first-time buyer decision, test several scenarios for taux_pret, montant_fn and taux_assurance in a detailed buy or rent simulator. Simulate your situation on buy-or-rent.net.