How Much Can I Borrow Based on My Salary in Belgium?

When you start making plans to buy a home, the first question is almost always: how much can I borrow based on my salary? Your salary, combined with your fixed costs and personal contribution, determines the maximum amount your bank will be willing to finance. Banks and credit brokers work with a number of rules of thumb: your total monthly repayments generally may not exceed 30–40% of your net household income, and in most cases the bank finances a maximum of 90% of the property value. In this guide we explain how this works and give concrete examples per income level.

1. The basics: how much of your salary can go towards loans?

The core question behind how much can I borrow based on my salary is: what share of your salary can go towards credit repayments without putting you in financial difficulty?

Sources and banks apply similar limits:

• NB Projects and other experts: 30–35% of your net household income as a safe limit for your mortgage.
• KBC: the total of your monthly credit obligations (all loans combined) should ideally not exceed 40% of your net income.
• Keytrade Bank: uses 45% of your net income as the upper limit for the monthly repayment in its examples, depending on your profile.
• Hypotheekwereld: banks generally apply a limit whereby your mortgage may amount to a maximum of 40–50% of your net income, with some margin for strong files.

Lenders also look at a minimum living allowance: what you have left after all repayments to cover daily living costs (e.g. around €1,000 for a single person, around €1,200 for a couple, with an additional amount per child).

In practice, this means:

• Conservative approach: aim for 30–35% of your net income.
• Slightly more ambitious approach (strong profile, no other debts): up to 40–45%.

2. Loan-to-value: what percentage of the property can you borrow?

Alongside your salary, the loan-to-value ratio (the relationship between the loan amount and the value of the property) also plays a role in how much you can borrow.

Guidelines from the National Bank of Belgium and commercial banks:

• Most banks finance a maximum of 90% of the property value for an owner-occupied home.
• For first-time buyers, a limited share of files may go up to 100% (sometimes slightly more to cover costs, but this is the exception and subject to strict conditions).
• For investment properties, banks typically finance a maximum of 80% of the value.

Concretely: if you buy a property for €300,000, you can in most cases borrow up to approximately €270,000 (90%), and you must finance the remainder plus costs from your own resources.

3. How much can I borrow based on my salary? Worked examples

The examples below assume "standard" files (no heavy additional loans, normal term and interest rate). They are intended as a rough guide, not as precise bank decisions.

Example 1: Single person, net income €2,500/month

Rules of thumb:

• 30% of €2,500 = €750
• 35% of €2,500 = €875
• 40% of €2,500 = €1,000

Online mortgage simulations show that with a monthly repayment of around €900–€1,000, a term of 25–30 years and an interest rate of around 3–4%, you can support a loan of roughly €180,000–€240,000.

Example 2: Couple, combined net income €4,000/month

NB Projects itself indicates: with an average net household income of €4,000, your maximum loan is around €320,000–€350,000, depending on the interest rate and term.

Rules of thumb:

• 30% of €4,000 = €1,200
• 35% of €4,000 = €1,400
• 40% of €4,000 = €1,600

With a monthly repayment of €1,300–€1,600, a term of 25–30 years and current interest rates, you will indeed find yourself in practice within the range of €300,000–€360,000 in borrowing capacity.

Example 3: Couple, combined net income €5,000/month

Rules of thumb:

• 30% of €5,000 = €1,500
• 35% of €5,000 = €1,750
• 40% of €5,000 = €2,000

Simulations show that a couple with such a monthly budget can often borrow between €350,000 and €450,000, depending on the interest rate, term and whether other loans are running concurrently.

Important: if you already have existing loans (car loan, personal loan, credit card), these are factored into your total credit ratio. This reduces your maximum mortgage amount accordingly.

4. The impact of term and interest rate

With the same salary, you can borrow more or less depending on:

• the loan term (20 vs 25 vs 30 years);
• the interest rate (2.8% vs 4.5%, fixed or variable).

A longer term reduces your monthly repayment, allowing you to borrow more at the same income limit; but you pay more interest in total. Rate simulations from banks and comparison websites show that interest rate changes of one percentage point can easily shift your maximum borrowing capacity by tens of thousands of euros.

5. Personal contribution: how much do you need?

Alongside the question of how much can I borrow based on my salary, there is another one: how much do I need to put in myself?

Guidelines:

• Banks generally expect at least 10% personal contribution on the purchase price (the bank typically finances a maximum of 90%).
• In practice, 20% of your own funds is often healthier, as it also allows you to cover part of the costs (registration duties, notary fees, bank charges) from your savings.

Immomakelaarvergelijker sums it up: banks standardly finance a maximum of 90% of the property value; you contribute the difference plus the costs.

6. Quick steps to estimate your own maximum

Want to make an estimate in 5 minutes of how much you can borrow based on your salary:

1. Calculate your net household income per month.
2. Take 30–35% of that amount as the target monthly repayment for your mortgage (40% if you want to calculate on the higher side).
3. Use an online mortgage simulator (from a bank or independent provider) and enter this monthly repayment to see which loan amount corresponds to that repayment, for terms of 20, 25 or 30 years.
4. Check whether you have sufficient personal contribution to reach the purchase price plus costs within the loan-to-value limit (generally a maximum of 90%).

This gives you an initial framework to search for properties in the right price range, before sitting down in detail with a bank or mortgage broker.

If you wish, I can - based on a specific net monthly income (single or couple) - draw up a short table showing: maximum monthly repayment, estimated maximum loan amount and indicative purchase price (with 10–20% personal contribution).