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Business use of home is an allowable deduction. Your home does not have to be owned.
Deductible expenses for business use of your home include the business portion of real estate taxes, mortgage interest, rent, casualty losses, utilities, insurance, depreciation, maintenance, and repairs. You may not deduct expenses for lawn care in general or for painting a room not used for business.
Self-employed taxpayers filing Form 1040, Schedule C (PDF), Profit or Loss From Business (Sole Proprietorship) first compute this deduction on Form 8829 (PDF), Expenses for Business Use of Your Home.
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Please let me know if you need clarification.
Your question was "if I rent a apartment for 100,000 a year and run a business from there with business phone can I right part of the rent off on taxes"
The answer is yes. How much will depend on the total sq footage of your home and the sq footage you use for business.
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