What is an onderhandse lening? The complete guide

More money moves between Dutch families than through some banks. Parents help children with a house deposit, friends bridge a gap, grandparents chip in for a renovation. In most cases it starts with good intentions and a handshake, and that is exactly where things go wrong.

What is an onderhandse lening?

An onderhandse lening is a private loan between two people, not a bank. It is fully legal and very common in the Netherlands. But the Belastingdienst only treats it as a real loan when it looks like one. That means three things: a written agreement, a market-conform interest rate, and actual payments.

The three rules that make it official

• A written agreement stating the amount, the interest rate and the term.
• A market-conform (arm’s-length) rate, comparable to what an independent lender would charge.
• Real repayments that actually happen, not just a schedule on paper.

Why bother making it official?

Two reasons. First: clarity. Nobody argues about a loan that is written down, signed, and repaid automatically. Second: taxes. When the loan is for a home, the borrower may deduct the interest, but only if the loan meets the rules. And when the rate is too low, the Belastingdienst can treat part of the loan as a gift.

FLUX5 handles all three rules for you: the contract is generated and signed digitally, the calculator shows the market-conform band, and repayments debit automatically every month.