How Much Do You Repay Per Month on a House?

Anyone looking to buy a property quickly runs into the question of how much to repay per month on a house. Your total monthly payment depends on three elements: the amount you borrow, the loan term and the interest rate. The higher the rate or the shorter the term, the higher your monthly repayment. On top of that, you need to align your housing costs with your income so you don't end up in financial difficulty. In this guide we explain what factors determine your monthly repayment, what rules of thumb banks use and we provide clear calculation examples.

1. What determines your monthly repayment?

The monthly repayment on your mortgage is the amount you pay the bank each month to pay back your loan, made up of capital plus interest. It is determined by:​

• The amount borrowed: the more you borrow, the higher the monthly payment.
• The loan term: with a longer term (e.g. 25-30 years) your monthly amount is lower, but you pay more interest overall.
• The interest rate: the higher the rate, the higher your monthly repayment.
• The type of rate: fixed, variable or mixed - with a fixed rate your monthly payment stays the same; with a variable rate it can change over time.

Online simulators show that for the same amount and term, a higher interest rate clearly results in a higher monthly payment.

2. Rule of thumb: what share of your income can go towards the loan?

To determine how much you can repay per month on a house, banks apply a number of prudential rules:

• As a general rule, your total monthly repayments across all your loans (mortgage, car, personal loans, credit cards...) should not exceed roughly one third of your net income.
• For very stable incomes this can sometimes be slightly higher, but banks generally aim for a debt-to-income ratio of between 25% and 35% of your net household income.

Example:

• Net household income: 3,000 euros per month.
• One third of that is 1,000 euros.
  → The bank will typically consider a maximum monthly payment of around 900-1,000 euros acceptable, taking any other existing loans into account.

3. Calculation examples: how much to repay per month on a house?

The examples below illustrate how the combination of amount, term and rate affects the monthly repayment. The concrete figures are based on representative simulations of Belgian home loans.

Example 1: borrowing 170,000 euros, 20 years, fixed rate ± 4.9%

A representative example shows:

• Loan: 170,000 euros
• Term: 240 months (20 years)
• Fixed interest rate: 4.93%
• APR: 5.27%
  → Monthly repayment: approximately 1,105 euros.​

On top of this come administration fees and notary fees, but for your monthly payment what matters most is that 1,105 euros figure.

Example 2: borrowing 200,000 euros, 25 years, fixed rate ± 3%

A simulation for a home loan of 200,000 euros over 25 years at a fixed rate of 3% produces:

• Term: 300 months
• Rate: 3%
  → Monthly repayment: approximately 944 euros.​

You are borrowing more (200,000 euros instead of 170,000 euros), yet with a lower rate and a longer term, your net monthly payment can still end up lower than in example 1.

Example 3: impact of the loan term

Suppose you borrow 200,000 euros at a rate of around 3%:

• Over 20 years: monthly payment roughly in the range of 1,100-1,150 euros.
• Over 25 years: monthly payment around 940-950 euros.
• Over 30 years: the monthly payment drops a little further, but the total interest paid rises noticeably.

Shorter term = higher monthly payment, lower total interest.
Longer term = lower monthly payment, higher total interest.

4. How to calculate your own monthly repayment

You can approach your monthly repayment in two ways:

1. Starting from the property price
   • Work out how much you need to borrow (purchase price - own contribution - costs).
   • Choose a term (20-25-30 years).
   • Simulate your monthly payment at different interest rates using an online calculator.
2. Starting from your income (working backwards)
   • Calculate what you can safely afford each month (e.g. a maximum of 1/3 of your net income).
   • Use a simulator to find out which loan amount and term fit that budget, and therefore which property price is within reach.

Simulation tools automatically generate an amortisation schedule: each month you can see how much capital and how much interest you are repaying and what the outstanding balance is.

5. Other costs beyond the monthly repayment

When asking how much to repay per month on a house, don't forget that your housing budget is broader than just your loan:

• Insurance: buildings insurance, and often also outstanding balance insurance.
• Fixed charges: property tax, syndic fees for an apartment, utility costs.
• Maintenance and renovation: particularly for older properties.

It is therefore wise not to set your monthly mortgage payment at the absolute maximum the bank allows, but to leave room for these additional costs and unexpected expenses.

6. How to work out what is affordable for you

In summary, to determine how much you can repay per month on a house:

1. Analyse your income and fixed expenses
   • Calculate your net monthly household income.​
   • Add up all your current repayments (car, personal loans...).
2. Apply a safe debt-to-income ratio
   • Ideally keep total monthly repayments below 30-35% of your net income.
3. Run simulations
   • Try different terms and rates to see what they do to your monthly payment.
   • Also look at the total amount to be repaid, not just the monthly figure.
4. Keep a buffer
   • Make sure that, beyond your monthly loan payment, you still have enough room to save, cover unexpected costs and maintain your quality of life.

By working this way, you get an answer not only to how much to repay per month on a house, but also to the more important question: which monthly payment fits healthily within your life and your income.