What percentage of your income can you afford to spend on a mortgage?
Buying a home? That usually means taking out a loan. But how much of your monthly income should actually go toward that loan? Borrowing too much can significantly limit your financial breathing room. Borrowing too little might mean you’re missing out on opportunities. So the trick lies somewhere in between: a mortgage that fits both your income and your lifestyle.
The 30% Rule: A Helpful Starting Point
A commonly used rule of thumb is the 30% rule. Under this rule, you spend no more than about 30% of your net income on your mortgage. For example, if you earn €3,000 net per month, that amounts to about €900 per month for your mortgage. Sounds simple? It is. But… it’s not an exact science.
The 30% rule is not a legal requirement, and banks do not use it as a strict limit. It is primarily a helpful guideline for determining whether your monthly payment remains manageable.
Why is that margin important? Because your income doesn’t all go toward your home. There are also energy bills, insurance, groceries, transportation, leisure activities, taxes, and (hopefully as few as possible) unexpected expenses. A healthy financial situation, therefore, leaves room for more than just your monthly mortgage payment.
Banks look beyond your pay stub
The amount you can borrow isn't determined by a single, simple percentage. A bank looks at your overall financial picture. How stable is your income? What loans do you already have? How much of your own funds can you contribute? And how much do you have left each month after all your fixed expenses are paid?
Your net income is, of course, the basis. A stable income generally provides more security. Certain sources of additional income, such as income from a side job or rental property, may also be taken into account in the assessment.
In addition, your existing financial obligations play an important role. For example, do you still have an outstanding car loan or personal loan? If so, you’ll have less room left for a mortgage.
In short: two people with exactly the same income can still be approved for very different loan amounts.
Your input makes a difference
Your own funds are also important when buying a home. The more you can contribute yourself, the less you’ll need to borrow. This can not only lower your monthly payment but also strengthen your financial profile.
In addition, when buying a home, you need to consider more than just the purchase price. Keep in mind closing costs, notary fees, and—depending on your situation—other additional expenses. So be sure to look at the total budget, not just the amount listed in the ad.
And then there's the interest rate
The interest rate has a direct impact on your monthly payment. A lower interest rate can give you more borrowing capacity within the same budget. But be careful: don’t just look at the amount you’re paying each month right now. The total cost of your mortgage also matters.
For example, a longer loan term usually means a lower monthly payment. That sounds appealing. At the same time, you’ll typically pay more interest over the entire term. A shorter loan term works the other way around: your monthly payment is higher, but your total interest cost may be lower.
How much can you really do without each month?
That may well be the most important question.
Not: How much is the bank willing to lend me?
But: How much am I willing and able to comfortably pay each month?
You don’t buy a home for just one year. Your mortgage often lasts for decades. Your financial situation may change during that time. Maybe you’ll have a child, your income will change, you’ll want to renovate, you’ll start working fewer hours, or you’ll simply want a little more financial freedom.
A mortgage that seems perfectly manageable today must also remain affordable tomorrow. That’s why it’s wise not to automatically opt for the maximum loan amount. A little financial breathing room can be worth a lot in the long run.
The ideal balance? It's different for everyone.
The 30% rule is a useful guideline, but not a hard-and-fast rule. Do you have low fixed costs, a solid financial cushion, and a stable income? If so, your situation may be different from that of someone with the same salary but with multiple outstanding loans and higher monthly expenses. That’s why you should look at the big picture:
your net income
your fixed monthly expenses
your existing loans
your own input
the interest rate
the term of your loan
your financial cushion
your plans for the future
Ultimately, a good mortgage isn't the one that lets you buy the most expensive home. It's the one that fits comfortably into your life.
So buying a home doesn’t just start with scrolling through real estate listings. It starts with knowing what’s financially feasible. Because how much you can borrow helps determine which homes you can consider. And the better you understand your budget, the more focused your search will be. Ready to explore your options? Let us guide you and get a clear picture of your budget. Do you already have a home in mind? Then you can use Immoscoop to immediately simulate what that property means for you financially. That way, you’re not just looking for a home you like, but also for a home that fits within your budget.