They can also be tax-efficient if you pay tax on your savings. This is because you do not earn any interest on your savings and so don't pay any tax on them. Instead you pay less interest on your mortgage. This amount is usually greater than the interest you would have earned after tax on your savings, if they were not offset against your mortgage. This benefit is greater if you are a higher rate taxpayer.
anatasha,
I know that many providers offer this type of product in the UK, are there other providers here in Ireland?
Is there a catch?.