Late payment fees: enforce your payment terms without losing your customers

A late invoice isn't just money missing from your bank account. It also means reminders to send, admin time and pressure on your cash flow. Late payment fees help offset part of that impact and remind customers that payment terms matter.

But when should you apply them? How much can you claim? And how do you stay firm without straining the business relationship?

The rules differ in France, Luxembourg, Switzerland and Belgium. Here are the key points to know before you build late fees into a clear collections strategy that fits your customers.

Why charge late payment fees?

Late payment fees serve three complementary purposes.

Encouraging customers to pay on time. A due date is a commitment on the customer's part. Spelling out the consequences of late payment sets clear expectations from the very start of the business relationship.

Offsetting part of the cost of late payment. Tied-up cash and follow-up work both come at a cost. Late-payment interest and compensation for collection costs address that cost, through the mechanisms set out in the applicable law.

Keeping your reminders consistent. With a policy defined in advance, you don't have to decide in a hurry which fees to claim and when.

The goal is still to collect the payment due, with an approach that is clear and proportionate.

Interest, compensation, reminder fees: what's the difference?

The term “late payment fees” covers several distinct concepts that are best kept separate:

• Late-payment interest or penalties, calculated on the unpaid amount, at a given rate, for the length of the delay.
• Fixed compensation for collection costs, which may be set by law.
• Additional costs, which require a valid legal or contractual basis and, in some cases, supporting documents.

You can't simply stack these amounts as you see fit. Before claiming them, determine which law applies and whether your customer is a business or a consumer.

What are the B2B rules in each of the four countries?

France: late payment penalties plus a €40 fixed sum

Between businesses, late payment penalties are due from the day after the payment date shown on the invoice, with no need for a prior reminder.

Unless a different rate has been validly agreed, the applicable rate is the European Central Bank refinancing rate for the relevant half-year, plus 10 percentage points. A contractual rate cannot be lower than three times the legal interest rate.

A fixed sum of €40 per invoice paid late is added to the penalties. If your collection costs are higher, you can claim additional compensation, provided you can document them.

The penalty terms and the fixed sum must be stated in the required business documents, including invoices and general terms and conditions of sale.

Luxembourg: interest with no prior reminder

In B2B transactions, interest can be claimed from the day after the contractual due date, provided the legal conditions are met, without any reminder or formal notice.

The statutory rate for commercial transactions is the ECB reference rate plus 8 percentage points.

The creditor can also claim a fixed sum of €40 for collection costs, plus reasonable compensation for any additional costs above that amount.

Switzerland: default interest, generally at 5%

As a rule, the statutory rate of default interest in Switzerland is 5% a year, subject in particular to any valid contractual agreement.

Interest starts to run once the debtor has been put in default. This usually requires a demand for payment, except in particular when the parties have agreed on a specific due date.

Reminder fees also need a valid basis. Adding a flat fee to a reminder for the first time isn't enough to make it payable. Likewise, if you claim additional damages, you must be able to prove them.

So check interest and additional charges separately, rather than automatically applying a fee schedule used in another country.

Belgium: interest plus a €40 fixed sum set by law

Between businesses, provided the creditor has met its own obligations, interest is automatically due from the day after the due date, without formal notice, unless the debtor can show that it is not responsible for the delay.

Unless another rate has been validly agreed, the statutory rate is the reference policy rate plus 8 points, rounded up to the next half percentage point.

Whenever late-payment interest is due, a fixed sum of €40 is added to the unpaid amount. Additional collection costs actually incurred may also give rise to reasonable compensation.

What if your customer is a consumer?

Don't automatically apply B2B rules to consumers.

In France, the €40 B2B fixed sum does not apply to consumers. Out-of-court collection costs are, in principle, borne by the creditor, except where the law provides otherwise. A clause in your general terms and conditions cannot override this protection.

In Luxembourg, the law sets specific conditions: among other things, the invoice must be issued within one month of delivery of the goods or performance of the service, and must state that statutory interest will be charged. This interest only starts to run once three months have passed since that event. The rate is set every year and cannot be replaced by a different rate in the contract.

In Switzerland, default interest must be kept separate from reminder or collection fees. Check that the customer has been put in default, that your contract clauses are valid and that any additional amounts claimed are justified.

In Belgium, Book XIX of the Code of Economic Law sets out several requirements, including a free first reminder and a waiting period of at least 14 calendar days before interest and compensation can be claimed. When this period starts depends on how the reminder is sent. Amounts are regulated and capped, and specific rules apply, for example, to certain sectors and to how SMEs calculate interest.

How do you apply late fees without alienating customers?

An effective policy combines clear rules with follow-up tailored to each situation.

Set out your terms from the start

State your payment terms and the possible consequences of late payment in the appropriate documents. Customers should be able to understand what's expected of them and what they may be charged.

Make every claim easy to understand

In your reminders, show the principal, interest and any compensation separately. When you claim interest, state the rate and the period it covers.

A clear statement is easier to understand and helps you resolve any dispute more quickly.

Tailor your reminders to the context

A one-off oversight, a disputed invoice and repeated silence each call for a different approach.

You can start with a courteous message, check that the invoice was received, then gradually make the tone firmer. This relationship-focused approach must still comply with the applicable deadlines and formalities, and it doesn't necessarily change the date from which interest becomes legally payable.

Automate with the right settings

Automated payment reminders help you follow up on every due date, consistently.

Set up separate reminder workflows depending on the type of customer and the applicable legal framework. Good automation should also handle payments already received, promises to pay and disputes.

Mistakes to avoid

Applying the same flat fee to every customer. An amount that is valid in a B2B relationship may not apply to a consumer.

Confusing an annual rate with an immediate surcharge. A rate of 5% a year doesn't mean the invoice goes up by 5% on the first day it's late.

Adding fees without explaining where they come from. Every amount you claim must be traceable to a valid rule or contract clause.

Leaving a dispute unanswered. Before sending more reminders, check whether a delivery, service or billing issue is actually holding up the payment.

Expecting fees to solve the problem. A surcharge is no substitute for talking to the customer or deciding how to proceed with the case.

Use late fees as a collections tool, not your only strategy

Managing late payments effectively starts with accurate invoices, clear due dates and reminders sent at the right time.

Late fees complement this approach. When out-of-court steps are no longer enough, you may need to escalate the case to debt collection, using the appropriate procedure.

With Recovr, you can manage all your invoice follow-up in one place and automate your reminders using your own workflows, while keeping a clear view of each customer's situation.

Your goal: enforce your payment terms, protect your cash flow and preserve your business relationships.

See how Recovr simplifies invoice follow-up.