A mortgage calculator for expats usually spits out a number that looks precise but does not match what a bank will actually offer. Most of these tools are built for a standard Dutch salary and cannot handle the 30% ruling, allowances, or the way an expat income is typically structured. For someone with a single fixed salary that barely matters, but for an expat with a more layered income, the gap between the calculator result and your real borrowing capacity can run into tens of thousands of euros.
Most online calculators work on one simple principle: you enter a gross annual income, the tool applies a fixed formula, and it returns a maximum mortgage amount. That works reasonably well if you have one income component and a permanent contract.
For an expat income, that picture is usually too simple. Several components can be involved: base salary, a relocation allowance, a housing allowance, sometimes a bonus, and in many cases the 30% ruling on top of all of it. A calculator with a single input field for “income” cannot process that structure correctly, and that is exactly where things go wrong.
In practice, expats often enter their net salary, including the tax benefit from the 30% ruling, while lenders base your borrowing capacity on your full gross salary, as if the whole amount were taxable. The 30% ruling means that up to 30 percent of your salary is paid out tax free; as of 2026 that percentage remains 30 percent. It mainly improves your net disposable income, not automatically your maximum mortgage.
If you enter your net salary as if it were your full income, you usually underestimate your borrowing capacity. If you instead add the tax-free portion on top of your gross salary, you overestimate it. Either mistake leaves you with an expectation that does not line up with what a bank will actually offer.
Some lenders also already factor in the period after your 30% ruling ends, and assess your file more conservatively as a result. A standard calculator almost never accounts for that nuance, even though it can be the difference between qualifying for the mortgage you want and not.
Many expats receive one or more allowances on top of their base salary: a housing allowance, a relocation allowance, or an international assignment allowance. Several lenders count these allowances as income for the mortgage calculation, provided they are structural and documented in your employment contract or employer statement. That can raise your borrowing capacity significantly, sometimes by tens of thousands of euros.
The problem is that banks differ in which allowances they accept and how heavily they weigh them. A generic calculator cannot account for that, because it runs on one fixed formula for everyone. The result is that two expats with the exact same income get the exact same number from a calculator, while at two different banks they could qualify for very different maximum mortgages.
| What a calculator usually does | What actually happens in practice |
|---|---|
| Uses one single income figure | Base salary, allowances and the 30% ruling are assessed separately |
| Applies one fixed formula for every lender | Each lender has its own policy on allowances and temporary arrangements |
| Ignores when the 30% ruling ends | Some banks already test affordability for the period after it ends |
Say you have a gross annual salary of 65,000 euros and four years left on your 30% ruling. A calculator shows what you could borrow right now, but not what happens once that ruling stops and your full salary is taxed like anyone else’s. Your net monthly costs will change, even though your gross income does not.
It is worth knowing that, from 1 January 2027, the 30% ruling drops to 27 percent for anyone whose ruling first started in 2024 or later. If you already had the ruling before 2024, a transitional arrangement lets you keep the full 30 percent for the rest of your term. That distinction determines how long you keep the full benefit, and it can affect how strictly a lender assesses your file.
An advisor can factor this into the choice of your fixed-rate period and repayment structure, precisely because your situation will change in a few years. An online calculator cannot do that by definition, since it only offers a snapshot rather than a forward look.
Beyond the maximum loan amount, many expats forget, partly because of what a calculator does and does not show, that there are additional costs on top of the purchase price. These purchase costs (kosten koper) generally run between 3 and 6 percent of the purchase price and have to be paid from your own funds; they are not automatically included in the figure a calculator shows you.
Take a purchase price of 500,000 euros as an example: that can easily add up to 15,000 to 30,000 euros in extra costs. Anyone who does not know this in advance sometimes only discovers the shortfall at the notary’s office, and that does not just cost money, it can cost weeks of delay right when the purchase seemed settled.
| Cost item | Tax deductible in 2026? |
|---|---|
| Property valuation | Yes |
| Notary fees for the mortgage deed | Yes |
| Mortgage advisory fees | Yes |
| Transfer tax | No |
| Buying agent’s commission | No |
What a calculator also rarely shows is that an application typically takes 4 to 6 weeks from submission to final approval. If you assume, based on a calculator, that everything will be settled within a week, you risk planning your move or notice period too tightly. A conversation via contact beforehand prevents you from working with the wrong timeline.
Say you have just been hired by an international company in Amsterdam, you have the 30% ruling and a housing allowance, and three different online calculators each give you a different number. It quickly becomes unclear what figure you should actually use while house hunting.
The advisors at our office see every day how lenders treat allowances, temporary arrangements and an international background differently, and translate your specific income structure into a realistic maximum per bank. That way you know not only roughly what you can borrow, but also which bank offers the best terms and what changes once your 30% ruling ends. Clients rate this approach 9.8 on Google, based on more than 750 reviews.
Want to know what your situation actually allows, instead of an estimate from a calculator? Message @dekredieter, visit www.kredieter.nl or call 020-5753320 for a no-obligation conversation.
It gives a rough sense of the range, but results can vary widely because each tool makes different assumptions about income and allowances. Treat the outcome as a starting point, not a promise. For a reliable figure you need an assessment of your full income situation, including how specific lenders actually treat it.
Yes, a temporary contract can count if your employer provides a letter of intent stating the relationship will likely continue or become permanent. Without that letter, banks tend to assess more cautiously. A generic calculator usually ignores this distinction, even though it directly affects the result you get.
Yes, most lenders require that a partner whose income counts toward the application actually resides in the Netherlands. If your partner still lives abroad, that income typically does not count in the calculation. That can limit your maximum mortgage significantly compared to what a simple calculator based on combined income would suggest.
Yes, expats are subject to the same financing rules as Dutch buyers: you can borrow up to 100 percent of the purchase price, or up to 106 percent when you also finance energy-saving measures. There is no separate, lower limit based on nationality. The real difference lies in how your income is assessed, not in the available financing room itself.
