The first reminder for an unpaid invoice should be free of charge. For subsequent reminders, the cost should not exceed 10 euros per reminder.

The possibility of charging fees must be outlined in the terms of sale, in accordance with the maximum limits for consumer late payments to businesses.

Specifically, this means that the following thresholds may not be exceeded:

1. a fixed amount of 20 euros if the balance due is less than or equal to 150 euros;
2. 30 euros, plus 10% of the amount due on the tranche between 150.01 and 500 euros if the balance due is between 150.01 and 500 euros;
3. 65 euros, plus 5% of the amount due on the tranche above 500 euros, up to a maximum of 2,000 euros if the balance due exceeds 500 euros.

In addition, the telecom operator may charge interest up to the legal interest rate (currently 5.25%) for each day of delay.