Sorry if there wasn't enough detail in my earlier post. I will pay approx €6k of interest this year ie from August 2007 to December 2007 on a fixed rate mortgage. My understanding was that I would receive a tax credit of €133 per month ie (€8k x 20%)/12. Instead of that I appear to be getting relief for the entire amount of interest estimated for the year ie (€6k x 20%). Since my repayments started in Sept and I only have four repayments this year, the tax credit is quite significant each month and means my repayments at the moment are a lot lower than I expected. I have tried to calculate it but it is not working out exactly for me, that's why I wondered if anyone could confirm how they calculate it. Presumably from 1st Jan 2008, the tax relief will revert to €133 per month plus the additional €33 per month credit promised. Thanks.