I am an independent contractor. I had doorknobs repiared. Can I deduct the cost on form 8829 business use of home

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If you have a home office and the door knobs were for that office the cost is deductible. If the replacement was for elsewhere in the home only the percentage deduction applied to your office is deductible. So if your percentage space for your office is 10%, 10% of the cost is deductible.