Hi All, Hopefully someone can give me a valid suggestion. I'm after a reasonable basis or way to apportion the interest charged from a loan on a property that I lived in for about 7 months in FY09/10, then rented for the rest. I know I can claim a deduction for the interest I was charged over the 5-month period that the place was rented for, but am not sure of a reasonable way to calculate it. I have the total interest charged for the year figure ($11,506), but obviously interest rates have changed a lot over the last year, so I can't just split this 7/5. My statements show monthly interest payments (IO loan), but dont show exactly what period they cover (ie dates), and it shows when rate rises occurred, but not what the actual rates were (or I could calculate it in excel). What would be a reasonable way to apportion the interest - how would accountants normally do this? We are doing our own tax. Thanks for the help!! Cheers, Redman.