What is Mortgage Interest and how does it relate to my Rental Income?
This relates solely to Mortgage Interest (rental interest) arising from a rental property.
For Rental Income purposes you can deduct the Mortgage Interest that you have paid in that year.
How much can be claimed?
For 2017 you can claim 80% of your mortgage interest paid in the year as a deduction. From 2009 to 2016, only 75% of the Mortgage Interest was allowed.
Also, since 2006 one can only claim this deduction if the landlord has complied with the requirement to register residential tenancies with the Private Residential Tenancies Board.
A certificate of interest paid (obtained from the mortgage provider) would be required and must be retained for a period of 6 years, as per Revenue.