For the regular method of claiming the Home Office Deduction, you enter the expense totals, for each category, for the year.
Another way to claim the Home Office Deduction is by taking the Simplified Option for Home Office Deduction - IRS.gov
If you are self-employed, to enter the Home Office Deduction, click on Where do I enter the home office deduction for my business?
If you are an employee, to enter the Home Office Deduction, click on Where do I enter the employee home office deduction?
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