9,500 residential mortgage accounts will be impacted by the move.
Some mortgage holders with Pepper Advantage are facing interest rate hikes of up to 1 per cent.
The company today announced around 9,500 residential mortgage accounts will be impacted by the move.
In a statement, the firm says it follows the three increases in rates announced by the European Central Bank this year.
The average rate will increase from 5.9 per cent to 6.3 per cent, according to the company.

Missing Person Appeal: Ellie Harty (17), Newbridge
Kfm Obituary Notices
Kildare Homeowners Warned Of Increased Rat Risk Following Record-Hot Summer
Work Begins On €4.3 Million Housing Development In Kildangan
Boil Water Notice Lifted For Rathangan Estate
Junction Improvement Works Planned For Road Near Robertstown
Kildare-Based Short Film Receives €14K Funding From KCC