Key takeaways

• A late payment is measured against the agreed due date, not the invoice issue date.
• The most effective lever comes first: a clear, compliant invoice sent quickly gets paid faster.
• A steady reminder plan, from a polite nudge to a formal notice, recovers most overdue amounts without conflict.
• The law allows late-payment interest and a fixed 40-euro compensation for recovery costs.

A customer who pays sixty days past due is not an isolated incident: it is a cash advance your business grants without having chosen to. For an SME, a few late invoices are enough to strain liquidity even when turnover is healthy. Reducing late payments is therefore less a question of recovery than of method: a clear framework, careful invoicing and steady reminders. This article sets out the concrete levers, from contract to reminder, to get paid on time without damaging the customer relationship.

Late payments: what the legal framework says in Belgium

Before chasing anyone, you need to know when an invoice is actually late. In Belgium, commercial transactions between businesses are governed by the Law of 2 August 2002, which transposes the European directive on combating late payment. Absent an agreed term, payment is due within 30 days of receiving the invoice or the goods and services.

Since the reform that took effect on 1 February 2022, the payment term agreed between businesses may no longer exceed 60 days. That ceiling matters: a clause imposing 90 days is no longer enforceable. Knowing this framework gives you a solid legal basis for your terms and conditions and for your reminders.

The detail of terms, interest and remedies is in our dedicated article, Payment terms between businesses in Belgium. This guide focuses on the method for avoiding a dispute in the first place.

Acting upstream to reduce late payments

The most effective reminder is the one you never have to send. Most delays do not come from bad faith but from avoidable friction: an ambiguous invoice, a wrong delivery address, a vague due date, or an inconvenient payment method. Removing that friction before you send mechanically reduces delays.

What makes an invoice get paid on time

• An explicit due date

  A precise payment date, not a vague mention such as 'on receipt'.

• Complete mandatory particulars

  A non-compliant invoice can be contested and delayed; check the legal particulars.

• Sending it the same day

  Every day between the work and the send is a day added to the due date.

• The right recipient

  Address the invoice to the accounts department or the agreed channel, not a sales contact.

• Easy payment

  Structured reference, correct details, and the electronic channel where it is available.

On that last point, sending a structured e-invoice saves time on both sides: the customer receives it straight into their accounting tool, with no re-keying and no getting lost in an inbox. Complete mandatory particulars also remove the late payer's most common excuse, the invoice deemed "non-compliant".

A steady, graduated reminder plan

Once the due date has passed, consistency beats immediate firmness. A reminder schedule known in advance and applied to every customer without exception outperforms an emotional chase sent too late. The goal is to stay on the customer's radar while preserving the relationship. The cadence below is a common starting point, to adapt to your sector.

1. 1

   Courtesy reminder

   A few days before the due date

   A neutral message confirming the due date and the payment details.

2. 2

   First reminder

   Day 3 to 5

   A factual email flagging that the invoice is overdue, with a copy of the document.

3. 3

   Firm follow-up

   Day 10 to 15

   A more direct tone, preferably a phone call, to clear any blocker.

4. 4

   Notice of default

   Around day 30

   A formal letter announcing late-payment interest and the recovery compensation.

Each step should record what was sent and when. That history serves two ends: it avoids chasing a customer who is already up to date, and it is useful evidence if the case moves to amicable or judicial recovery.

Manual reminders or automated reminders

For one or two customers, manual chasing holds. Beyond that, it becomes the first task you let slip in a busy week, exactly when cash flow needs it most. Automation does not replace human judgement on sensitive cases; it guarantees that the baseline cadence never stops.

Pairing it with bank reconciliation is what makes automation credible: as soon as a payment is detected on your account, the invoice moves to "paid" and the scheduled reminders stop. Without that link, automation risks chasing a customer who has already paid, which harms the relationship more surely than a missed reminder.

Automatic reminders, stopped the moment you are paid

YouInv links every invoice to its due date, triggers your reminders at the right time and stops them as soon as the payment is reconciled on your account.

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When amicable reminders are not enough

Despite careful tracking, some customers do not pay. The law then gives you leverage. In commercial transactions, from the first day of delay and without any prior notice, you can claim late-payment interest at the statutory rate plus a fixed compensation of 40 euros for recovery costs, provided for by Directive 2011/7/EU on combating late payment.

These amounts are not just a pressure tactic: announcing them in the notice of default is often enough to release a payment, because they make the delay more expensive than settling. If the case persists, amicable recovery by a third party and then judicial proceedings remain open, but they cost time and money. That is why the best strategy stays preventive: invoice cleanly, chase early and steadily, and automate what you can.

Further reading

• Payment terms between businesses in Belgium: the legal framework, terms and interest in detail.
• Bank reconciliation: automating payment matching: the link that makes reminders reliable.
• Automating your invoicing with YouInv: from issuing to tracking payments.

What is the legal payment term between businesses in Belgium?

Absent a contractual agreement, the term is 30 days after receipt of the invoice or of the goods and services. Since the reform that took effect on 1 February 2022, the term agreed between businesses may not exceed 60 days. See our article on payment terms in Belgium for the detail.

When is an invoice considered late?

An invoice is late as soon as the agreed due date passes without payment. If no term was set, the delay starts when the 30-day legal term expires. It is that date, not the invoice issue date, that triggers your reminders.

Can you charge late-payment interest to a business customer?

Yes. In commercial transactions the law lets you claim late-payment interest at the statutory rate plus a fixed compensation of 40 euros for recovery costs, provided for by Directive 2011/7/EU. These amounts are due by right from the first day of delay, without any prior formal notice.

How often should you chase a customer who has not paid?

A common cadence is a polite reminder a few days after the due date, a firm follow-up around ten to fifteen days, then a formal notice of default around thirty days. Consistency matters most: a steady schedule beats a late, one-off chase.

How do you automate payment reminders?

Invoicing software links each invoice to its due date and triggers reminders automatically on a schedule you set. Combined with bank reconciliation, it stops chasing as soon as a payment is detected, which avoids reminders sent by mistake.