You compare Dutch mortgage offers by putting the total cost side by side, not just the rate printed on the cover page. Two offers with almost the same interest rate can still differ by thousands of euros once you add up advisory fees, notary costs and how the penalty interest is calculated. The offer that looks cheapest on paper is not always the one that costs you least by the end of the fixed-rate period.
Say you get two proposals with rates that are 0.1 percent apart. It is tempting to pick the lower number and move on, but that single figure hides a lot. Advisory fees alone can differ by more than a thousand euros between offers, and one lender may quietly include NHG (Nationale Hypotheek Garantie, a government-backed guarantee explained further below) while the other leaves it out.
What actually matters is the total amount you pay over the fixed-rate period: the years during which your interest rate stays the same. That includes the mortgage rate itself, the one-off costs to arrange the loan, and any conditions that limit how flexibly you can repay early.
In practice, many buyers only discover the real difference once an independent adviser lays both offers next to each other. The team at our advisers deal with this comparison daily, because lenders rarely make it easy to see the full picture from the offer letter alone.
The rentevastperiode, the number of years your interest rate is locked in, changes more than your monthly payment. For fixed periods under ten years, lenders in 2026 must test your affordability against a toetsrente (test rate) of around 5 percent, even though your actual contracted rate is likely lower. This test rate can reduce how much you are allowed to borrow, so two offers with the same purchase price might allow different maximum loan amounts depending on the period you choose.
Then there is boeterente, the penalty interest a lender may charge if you repay more than the penalty-free allowance during the fixed period. Most lenders allow you to repay 10 to 20 percent of the original loan penalty-free each year, but anything above that can trigger a charge that is easy to miss when you are only comparing headline rates.
Average mortgage rates were expected to sit between 3.5 and 4.5 percent through 2026, so a difference of a few tenths of a percent between offers is normal. What is not normal is assuming that the offer with the shortest fixed period is automatically the cheapest; it depends on how the toetsrente and penalty terms interact with your own plans.
If one offer includes NHG (Nationale Hypotheek Garantie) and the other does not, you are not really comparing like for like anymore. NHG is a guarantee run by the Waarborgfonds Eigen Woningen that protects you if you can no longer pay your mortgage due to job loss, disability or divorce, and it has no direct equivalent in most other countries, which is worth knowing if you did not grow up with the Dutch system.
In 2026 the NHG limit rose to 470,000 euro, or 498,200 euro when the loan includes energy-saving measures. If your purchase falls under that ceiling, an NHG-backed offer usually comes with a one-time fee, the borgtochtprovisie, of 0.4 percent of the mortgage amount.
That fee is not wasted money. NHG-backed mortgages typically qualify for a lower interest rate because the lender carries less risk, and around 70 percent of expat home purchases may now fall within the raised limit. An offer without NHG can still be the better deal, but only if you have actually checked what the rate difference and the guarantee are worth to you.
Every offer comes with a list of one-off costs, and not all of them reduce your tax bill the same way. Some, like the advisory fee, are deductible in the year you buy. Others, like transfer tax, never are, regardless of which lender you choose.
| Cost item | Typical amount (2026) | Tax-deductible |
|---|---|---|
| Mortgage advisory fee | from around 3,250 euro (salaried starter) to 4,500 euro (self-employed repeat buyer) | Yes |
| Valuation (taxatie) | around 700 euro | Yes |
| Notary fee, mortgage deed | part of roughly 1,400 euro total notary costs | Yes |
| NHG fee (borgtochtprovisie) | 0.4 percent of the mortgage amount | Yes |
| Notary fee, transfer deed | part of total notary costs | No |
| Transfer tax (overdrachtsbelasting) | varies with purchase price | No |
| Purchasing agent fee (aankoopmakelaar) | varies by agent | No |
There is one more detail worth checking in every offer: deductibility only applies if you pay these costs directly from your own funds. If a lender lets you finance the advisory fee or NHG costs into the mortgage itself, that portion becomes a debt with non-deductible interest, which quietly changes the real cost comparison between two offers that looked identical.
Picture two offers on a 400,000 euro mortgage. Offer one has a rate 0.2 percent lower but no NHG and a 4,500 euro advisory fee. Offer two includes NHG, a lower risk-adjusted rate because of it, and a 3,250 euro advisory fee. Looking only at the headline rate points you toward offer one, but once you add the 1,600 euro NHG fee at 0.4 percent, the missing interest discount and the higher advisory cost, offer two can easily come out ahead over the fixed period.
The more expensive mistake happens later, when someone refinances without requesting an informatieve aflosnota, a statement from the current lender showing the exact penalty interest due. Skipping that step can mean paying boeterente that was never properly checked against the penalty-free allowance, sometimes adding weeks of delay and unnecessary cost to a deal that seemed straightforward. If you want a second set of eyes on a proposal before you sign, our advisers are reachable through the contact page for a direct review.
Comparing offers on your own is possible, but it is easy to miss a detail that only becomes clear months later. Here is how de Kredieter supports that process:
If you want a second opinion on a mortgage offer, reach out via @dekredieter, visit www.kredieter.nl or call 020-5753320.
A bank only shows you its own products, while an independent broker compares multiple lenders and can point out where one offer is genuinely better than another. Banks are not obliged to mention a competitor’s lower fee or better NHG terms, so a broker’s comparison often reveals savings a single lender’s offer would never show you.
Some elements, like advisory fees or minor conditions, can sometimes be discussed, but the interest rate itself is usually fixed once a lender issues a formal offer. The better moment to negotiate is before you accept, by requesting offers from several lenders and using them to compare terms rather than trying to renegotiate afterward.
Validity periods vary by lender but commonly run from a few weeks up to around three months, giving you time to arrange the purchase or complete a refinancing. Always check the expiry date printed on the offer itself, since missing it can mean requesting a new offer under different, possibly less favourable, market rates.
It depends on who provides it. Some advisers charge a fixed fee for reviewing an existing offer, while others include it as part of a broader advisory package. Ask upfront what a review costs and what it covers, since a proper second opinion should look at fees, penalty terms and NHG eligibility, not just the interest rate.
