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How to determine how much to charge your business for rent (in your house)?
In the UK it all comes down to what HMRC will allow you to charge without taxing you on the "rent profit" and not hitting capital gain tax when you sell the house, it may not all count as your "main home" if some is rented out.   (http://www.accountingweb.co.uk/ is a good place to ask this type of questions in the uk)