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How to report house used for 100% business?
As DJClayworth said, be very careful with this one!   The property is a residence, not a business location.  Given that, it is almost a certainty that the IRS is not going to let you claim 100% of the expenses for the home as a business expense, even if nobody's actually living there.   You may get away with doing this for a period of time and not run into zoning or other issues such as those DJ mentioned, but it's like begging for trouble.  You run the very real risk of being audited if you try to do what you're proposing, and rest assured, whatever you saved in taxes will disappear like smoke in the wind under an audit. That being said, there's no reason you can't call a tax service and ask a simple question, because in answering it they're going to hope to gain your business.  It'd be well worth the phone call before you land yourself in any hot water with the IRS.  I can tell you that I'd rather have a double root canal with no anesthetic than go through an audit, even when I didn't do anything wrong! (grin) Good luck!