Inactivity fees of 3€/month will be debited from your account if you don't make any transaction (payment, deposit, withdrawal, transfer or direct debit) during 9 entire consecutive months. The fees will start to apply from the 10th month.
These fees won't be debited any longer as soon as you make a new transaction.
If the balance of your account is zero, then no fee will be debited, even retroactively.