Late payment penalties are one of the most important protective mechanisms in French commercial law. Yet many businesses never apply them, allowing clients to delay payments without any financial consequence. In France, for H1 2026, the applicable rate is 12.15% per annum, and a flat-rate indemnity of €40 is automatically owed for each overdue invoice. Understanding the exact calculation, legal obligations and required mentions in your general terms of sale (CGV) is essential for protecting your cash flow and complying with the Commercial Code.
Definition of Late Payment Penalties
Simple Definition
Late payment penalties are interest automatically owed by a debtor who has not settled an invoice before the agreed due date. They represent financial compensation for the creditor, who bears a cash flow loss for the duration of the delay.
Contrary to common belief, late payment penalties require no prior action from the creditor to be owed. They arise automatically from the first day after the due date, by operation of law and without any prior formal notice.
In practice, two components coexist:
- Late payment penalties proper: interest calculated on the VAT-inclusive invoice amount, at the applicable legal rate
- The €40 flat-rate indemnity: a fixed amount owed for collection costs, in addition to the penalties
Legal Framework
Late payment penalties are primarily governed by:
- Article L441-10 of the Commercial Code: obligation to state the penalty rate in CGV and right to penalties without formal demand
- Article L441-9 of the Commercial Code: obligation to mention the penalty rate on each invoice
- Article D441-5 of the Commercial Code: the flat-rate indemnity fixed at €40
- LME Law n°2008-776 of August 4, 2008: the founding text, strengthened by the Macron Law 2015 and PACTE Law 2019
These provisions apply to all B2B commercial transactions without exception. For more on the broader legal framework, see our article on late payment penalties on invoices in France.
How to Calculate Late Payment Penalties
The Applicable Rate: ECB + 10 Points (or Legal Floor)
The late payment penalty rate is defined in article L441-10 of the Commercial Code. It corresponds to the higher of:
- The ECB refinancing rate plus 10 percentage points
- 3 times the legal interest rate (legal minimum floor)
For H1 2026 (rates in force since January 1, 2026):
| Reference | Base Rate | Penalty Rate |
|---|---|---|
| ECB (refinancing operation) | 2.15% | 12.15% (ECB + 10 pts) |
| Professional legal interest rate | 2.62% | 7.86% (3 × legal rate) |
The applicable rate for H1 2026 is therefore 12.15% per annum, as the ECB + 10 points rate exceeds the legal floor.
The ECB rate is updated twice a year: on January 1 (for H1) and July 1 (for H2). It is advisable to check the current rate at each semi-annual renewal.
The Calculation Formula
The late payment penalty calculation formula is as follows:
Penalties = VAT-inclusive amount × Annual rate × (Days late / 365)
Variable breakdown:
- VAT-inclusive amount: the total amount including VAT shown on the invoice
- Annual rate: the applicable legal rate (12.15% in H1 2026, i.e. 0.1215 in decimal)
- Days late: the number of calendar days between the due date and the actual payment date (or the calculation date if the invoice is still unpaid)
Concrete Example with Numbers
Consider an SME that issued an invoice for €10,000 VAT inclusive with a due date of March 15, 2026. The client pays on May 15, 2026 — 61 days late.
Penalty calculation: 10,000 × 12.15% × (61 / 365) = 10,000 × 0.1215 × 0.1671 = €203.05
Flat-rate indemnity: €40.00
Total owed on top of the principal: 10,000 + 203.05 + 40 = €10,243.05
On a €10,000 invoice, two months of delay generates over €243 in additional charges. If a business has 50 such overdue invoices per year, that is over €12,000 in theoretical losses from not claiming penalties.
See our dedicated article on flat-rate compensation for collection costs in France for full details on the €40 indemnity.
Impact on Your Business
Practical Consequences
Not applying late payment penalties has direct consequences on your cash flow and on client payment behaviour:
On cash flow: Each day of delay represents an interest-free loan to your client. In 2024, the Banque de France estimated that French SMEs would have had an additional €15 billion in liquidity if legal deadlines were respected. By not claiming your penalties, you are effectively subsidising your debtors’ working capital.
On client behaviour: A client who knows they will never be penalised for delays has no incentive to pay on time. Conversely, explicit mention of penalties in your CGV and on invoices acts as a deterrent that encourages adherence to due dates.
On provisions: Unclaimed penalties represent theoretical receivables that do not appear in your accounts. By claiming them systematically, you improve both your results and the accuracy of your accounting.
Common Mistakes to Avoid
Mistake 1: Not mentioning the rate in CGV and on invoices This is an offence under the Commercial Code and makes it harder to recover penalties in case of dispute. The mention is mandatory and cannot be omitted.
Mistake 2: Applying a rate below the legal minimum Some businesses set a penalty rate in their CGV (e.g. 1.5% per month) without realising it may be below the legal minimum. The contractual rate must be at least equal to the legal minimum. If a contractual rate is lower, the legal rate applies automatically.
Mistake 3: Forgetting the €40 flat-rate indemnity The €40 indemnity is frequently overlooked, yet it is automatically owed on every overdue invoice. On a large volume of invoices, the cumulative amounts can be significant.
Mistake 4: Confusing invoice date with due date Penalties run from the due date, not the invoice issue date. If an invoice dated March 1 has a due date of March 30, penalties start on March 31, not March 2.
Mistake 5: Waiving penalties to preserve the commercial relationship It is possible to choose not to claim penalties from a good client after an exceptional delay, but not providing for or mentioning them is a structural mistake. Having penalties in your CGV and choosing not to apply them in specific cases is very different from not providing for them at all.
Tools for Managing Late Payment Penalties
How to Automate Calculation and Collection
Manually calculating penalties for each overdue invoice is tedious and error-prone. With a significant volume of receivables, manual management quickly becomes impractical.
Modern collections tools enable automation of:
- Detection of overdue invoices from day one
- Automatic penalty calculation at the applicable legal rate
- Inclusion of penalties and the flat-rate indemnity in payment reminders
- Semi-annual ECB rate updates without manual intervention
Billabex is an AI-powered collections solution designed for French B2B companies. It automatically calculates late payment penalties on every overdue invoice, integrates the €40 indemnity, and sends professional payment reminders including a breakdown of all amounts owed.
The result: no penalties left unclaimed, full legal compliance, and a mechanically reduced DSO. Discover Billabex →
For more, see our guide on legal payment terms for invoices in France.
