Unless the parties in a contract agree to a different interest rate, payment obligations between trading parties are automatically subject to statutory commercial interest. This is a percentage that is set each year and can differ per country and region.Check this out :https://www.credifin-nederland.nl/wettelijke-rente/

Statutory interest and debt recovery costs can be charged on overdue accounts relating to the sale of goods or services. It is a charge that can be added to the amount of the overdue debt and must be paid within a certain period. Until recently, the right to claim statutory interest was only available to small businesses. From 1 November 2002, this right was extended to all businesses. It also applies to contracts between companies or between a company and a government institution.

When does a debt become late?

Usually, a payment becomes late 30 days after your customer receives the invoice (or later, if they have accepted your delivery or service). You can agree on a longer period than this for public authority customers and business transactions. However, the agreement must not be grossly unfair to you.

You may be able to find out whether you are entitled to charge statutory interest by looking at the Bank of England base rate history and the terms of your own contracts. If you do have a contractual interest clause, you can use an interest calculator to determine how much you should charge. It’s important to think about your relationship with the customer before you add interest and fees and to give them a chance to pay. Otherwise, you might have to take legal action.