Passport Office officials are before the Public Accounts Committee (PAC) to explain delays.
There are reports that some people are waiting up to eight weeks to get their passport - with people being advised to apply online instead of in person.
Committee chairman Seán Fleming says they will also be "keen" to discuss passport and visa consular fees, which make up the bulk of receipts.
In 2016, passport application fees amounted to €46.7m.
Department of Foreign Affairs Secretary-General, Niall Burgess, outlines what's causing some passport delays.
"Where the blockage is on the system is - the delay for first time renewals and lost passports - is in the checks, which are far more complicated.
"They take more time.
"The time we're stating on our website at the moment is 33 days, which is the actual turnaround time, but it's been coming down progressively".