Home borrowers are being urged to consider fixing their mortgage rates because of the increasing odds there will be only one more interest rate cut this cycle. The gap between some of the lowest fixed rates and average, variable rates is now bigger than a quarter of a percentage point. Pacific Mortgage Group offers the lowest fixed rate of 5.14 per cent for those with a usual 20 per cent mortgage deposit. The 36 basis point gap is also bigger than a prospective 25 basis point RBA rate cut. Should the RBA cut rates just one more time, a variable rate borrower would be paying $3,744 a month.