A good few drivers that I know of, myself included, recently received an email from NTA advising that:
A recent check based on the PPS number associated with your licence has identified that you are not
currently registered as tax compliant. To comply with the licensing requirement set out in law, you must
immediately obtain an eTax Clearance Certificate from the Revenue Commissioners.
All those who have checked, myself included, have valid tax clearance as required.