Just be careful on few things. Though people write their internet/cable/phone bills off unless used exclusively for daycare you can't so if you are comfortable taking that risk go ahead, if you get audited they will disallow that. I'm pretty sure you can write your mortgage interest off the percent you use but I think if you do mortgage payment that would be capital gains if you ever sell. Also pretty sure you can only write your car interest off and not the payment unless its a lease. The gov't site has a lot of info online and you can always call too.