 federal for an income tax system personal interest usually you would think not right and this would be things like if you use your credit card for example to go in a shopping spree for personal clothes that you don't even wear or something like that right or just to arrest whatever it is I'm not trying to pick on people who wear whatever whatever you buy personally if it's a personal expense you would think it wouldn't normally be deductible if you financed the personal expense with a loan if you took out a loan to go on a vacation to Hawaii or something and it's totally personal you would think the interest on the loan would not be deductible because it would be personal that's the general rule the big exception to that is of course