What should I do if the turnover exceeds €15,000 in the middle of the accounting period?

If the company has not been registered for VAT and its turnover exceeds €15,000 during the accounting period, you will have to pay VAT retroactively for the entire period. You may also have to pay late-payment charges.

If you notice that the turnover exceeds the €15,000 threshold during the accounting period:

• Sign up for the VAT register immediately.
• File VAT returns for the entire accounting period. 
• Pay the VAT for the entire accounting period.

Read more about filing and paying VAT