About Renteradar.be

What is Renteradar.be?

Renteradar.be is a free tool that compares your mortgage rate with the official Belgian market rate. You enter the start date, your interest rate, the loan type, and your outstanding principal. We show where the market sits today, how it has evolved since you signed your loan, and whether refinancing might be worth it for you right now.

What we don't do: no credit advice, no brokerage, no accounts, no email collection. Nothing you enter in the form is sent to Renteradar.be. Every calculation happens in your browser. We're also not registered with the FSMA as a credit broker.

Why does it exist?

In Belgium, refinancing is usually not worth it. The early-repayment fee, file fees, and notary fees eat up a large share of the rate gap. But there are moments when it does pay off, and those moments are hard to spot without watching the market closely. Renteradar.be shows you in thirty seconds whether you're at one of those moments, without going through a bank or broker.

How does it work?

• Market rate. We display the monthly weighted average of new Belgian mortgage credits with an initial fixation period above ten years. That's the bucket where refinancing actually lands. The data comes from the NBB via the ECB Data Portal.
• Break-even. We estimate the switching costs from your outstanding principal: early-repayment fee (legally capped at three months' interest), file and valuation fees, plus notary and mortgage registration fees. From that we derive how many months you'd need to recoup those costs through your lower monthly payment.
• Verdict. We slot the result into one of four buckets, from "no advantage yet" to "clear win". The threshold depends on your remaining term: the fewer years you have left, the larger the rate gap has to be.

Who's behind it?

Renteradar.be is an independent project by Fousa, a freelance developer based in Belgium. It's a personal project, built out of frustration when I wanted to know whether my own mortgage was still a good deal. Not a regulated financial product. For the actual decision, talk to your bank or an independent financial advisor.

What's next

The next step (v1.1) is an alert function: leave your email and we'll notify you the moment your rate gap crosses the break-even threshold. A real broker handoff is on the table but cautious. Once commission or intermediation enters the picture, an FSMA registration becomes necessary, and that's not a one-afternoon job.

Questions or comments?

Question, bug spotted, or a verdict that surprised you? Send us a message. Feedback from the first hundred users shapes v1.1 directly.