Max van Vugt 2 mei 2025

Income tests where you need to calculate a mortgage

Anyone looking to buy a house will inevitably face an income test. It is the starting point for any kind of mortgage advice. Banks, lenders and advisers want to know what you can bear, now and in the future. Therefore, with any income situation, it is important that you have your mortgage calculated to suit your working form, plans and financial space. The outcome not only determines how much you can borrow, but also which type of mortgage you ultimately choose.

Forms of work that affect income tests

Not everyone has a permanent contract and a stable income. For salaried employees, the test is relatively straightforward. The employer's income statement forms the basis. But for flex workers, self-employed or entrepreneurs, the situation is different. There, average income over several years is considered. Stability, industry developments and existing obligations are also taken into account. In such cases, it is extra important to be able to calculate a mortgage in advance, so that you look realistically at your options and do not encounter any surprises. An income test is not a snapshot, but a broader assessment of your financial capacity.

Life stages in which the income situation changes

When buying your first home, moving house after a divorce or when retiring, the income situation often changes considerably. In all these cases, another income test is needed. This determines the responsible amount to borrow. Even if you are buying with two incomes, the relationship between them is taken into account. Not every income counts 100 per cent. The test takes into account risks, employment contracts and any future changes. This is why more and more people choose to have their mortgage calculated before they start looking for a home. It gives direction and prevents disappointment.

Mortgage forms where income verification is decisive

Not every type of mortgage is equally flexible when it comes to assessment. An interest-only mortgage often has stricter requirements. Linear or annuity mortgages are more common and fit better within the assessment framework of many banks. Those who pay part of the home value with their own money can look more broadly. But even then, an income test is still required. It prevents someone from stretching themselves financially. Especially in times of rising interest rates or uncertain markets, it is important to remain realistic. For those seeking personal advice, Smart Mortgage offers an overview of options tailored to a variety of income profiles and mortgage types, without directly selling anything.

Times when a review is needed again

An income test is not only relevant when buying a house. The test also returns when refinancing, increasing your mortgage or financing a renovation. In those cases, the loan situation changes, and a new look needs to be taken at what is financially responsible. The same applies when ending a relationship or taking over a mortgage. In all these scenarios, it is important not to act blindly, but first have your mortgage recalculated, tailored to the current situation.


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