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The 2004 Form 8829, titled "Expenses for Business Use of Your Home," is an IRS form used by U.S. taxpayers to calculate and report eligible expenses related to using their home for business purposes. It is primarily used by self-employed individuals or small business owners who operate from a part of their residence. The form allows taxpayers to determine the deduction amount they can claim for a proportionate share of their home expenses, such as mortgage interest, utilities, and depreciation.
Part I - Calculate Your Home's Business Use:
Part II - Figure Your Allowable Deduction:
Part III - Depreciation of Your Home:
Part IV - Carryover of Unallowed Expenses:
The form enables business owners to take advantage of the home office deduction, thus potentially reducing taxable income significantly. Claimed correctly, these deductions can lead to substantial tax savings by accurately attributing home expenses to business activities.



An independent accountant uses her basement exclusively for business activities. Her total home is 2,000 square feet, with a 200 square foot office. She will claim 10% of indirect home expenses and direct office supplies as deductions, precisely calculated using Form 8829.
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