Fine Gael is proposing community service instead of jail for those who don't pay fines and debts.
Up to November 12 this year more than 3,300 people who failed to pay fines were imprisoned.
Up to 157 people found themselves behind bars for the non-payment of outstanding debts.
But Fine Gael's justice spokesman Charlie Flanagan has said "Ireland's jails are being overcrowded with the wrong type of offender".