Three quarters of third level students work during term to help fund the cost of college, according to a survey by the Irish League of Credit Unions.
The proportion of students who said they skipped lectures in order to attend work has risen to more than half, the study found.
That's up from around a fifth in 2017.
iReach surveyed 445 students as part of the ILCU study in April and May of this year.
A quarter of those surveyed said finance or debt was their biggest college-related concern.
Of the three quarters who say they have to work to cope with costs, seven in ten work part-time.
14% work full-time and 15% work ad-hoc hours, the survey revealed.
On average, students are working almost 15 hours a week and earn €10.14, just above the national minimum wage of €9.80 per hour.
The average monthly spend for a student living at home is €1,047 per month, while for those living at home, the average spend comes in at €738.
"The realities of the impact of financial pressure on our third level students is apparent in this survey," Paul Bailey, Head of Communications with the ILCU said.
"At a time when they should be focusing on their education, it's worrying to see that greater numbers are skipping lectures and sacrificing time spent on their education in order to earn some extra money."