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How to determine how much to charge your business for rent (in your house)?
If you are talking about a home office, you don't "charge" the business anything. If the area is used exclusively as an office you pro-rate by square footage just the actual expenses.  TurboTax recent published an article "Can I Take the Home Office Deduction?" which is a must read if you don't understand the process. (Note: I authored said article.)