Until last week, the firm paid brokers' commission within 48 hours of closing mortgage deals. However, it now says brokers will be paid "on or around the 20th of each month".

The move means many of the 150 brokers who deal with Mortgage Times have not received commission payments as expected for mortgage business conducted just prior to the change. The firm has also asked brokers to submit their commission claims through the post and not electronically.

The firm was established by Irish businessmen Jim Costello and Paul Crewe in association with the British Mortgage Times group.

Costello said the changes were made for logistical reasons.

"The computer systems we have in the UK didn't work over here. . . so we've had to do this as an interim measure, " he said.

He said Mortgage Times Ireland was processing around Euro15m worth of mortgages a week, significantly more than expected. He also said the requirement to send claims by post was "a piece of tracking, which is important as this is such a heavily regulated industry".