Publication 587
Business Use of Your Home

(Including Use by Day-Care Providers)

For use in preparing 2002 Returns

Separate Structure

You can deduct expenses for a separate free-standing structure, such as a studio, garage, or barn, if you use it exclusively and regularly for your business. The structure does not have to be your principal place of business or a place where you meet patients, clients, or customers.

Example.   John Berry operates a floral shop in town. He grows the plants for his shop in a greenhouse behind his home. He uses the greenhouse exclusively and regularly in his business, so he can deduct the expenses for its use, subject to the deduction limit, explained later.

Figuring the Deduction

After you determine that you meet the tests under Qualifying for a Deduction, you can begin to figure how much you can deduct. You will need to figure the percentage of your home used for business and the limit on the deduction.

Business Percentage

To find the business percentage, compare the size of the part of your home that you use for business to your whole house. Use the resulting percentage to figure the business part of the expenses for operating your entire home.

You can use any reasonable method to determine the business percentage. The following are two commonly used methods for figuring the percentage.

1. Divide the area (length multiplied by the width) used for business by the total area of your home.
2. If the rooms in your home are all about the same size, you can divide the number of rooms used for business by the total number of rooms in your home.

Example 1.  

• Your office is 240 square feet (12 feet × 20 feet).
• Your home is 1,200 square feet.
• Your office is 20% (240 ÷ 1,200) of the total area of your home.
• Your business percentage is 20%.

Example 2.  

• You use one room in your home for business.
• Your home has four rooms, all of about equal size.
• Your office is 25% (1 ÷ 4) of the total area of your home.
• Your business percentage is 25%.

Use lines 1-7 of Form 8829, or lines 1-3 on the worksheet near the end of this publication, to figure your business percentage.

Part-Year Use

You cannot deduct expenses for the business use of your home incurred during any part of the year you did not use your home for business purposes. For example, if you begin using part of your home for business on July 1, and you meet all the tests from that date until the end of the year, consider only your expenses for the last half of the year in figuring your allowable deduction.

Deduction Limit

If your gross income from the business use of your home equals or exceeds your total business expenses (including depreciation), you can deduct all your business expenses related to the use of your home. If your gross income from the business use of your home is less than your total business expenses, your deduction for certain expenses for the business use of your home is limited.

Your deduction of otherwise nondeductible expenses, such as insurance, utilities, and depreciation (with depreciation taken last), allocable to the business, is limited to the gross income from the business use of your home minus the sum of the following.

1. The business part of expenses you could deduct even if you did not use your home for business (such as mortgage interest, real estate taxes, and casualty and theft losses that are allowable as itemized deductions on Schedule A (Form 1040)). These expenses are discussed in detail under Deducting Expenses, later.
2. The business expenses that relate to the business activity in the home (for example, business phone, supplies, and depreciation on equipment), but not to the use of the home itself.

If you are self-employed, do not include in (2) above your deduction for half of your self-employment tax.

Carryover of unallowed expenses.   If your deductions are greater than the current year's limit, you can carry over the excess to the next year. They are subject to the deduction limit for that year, whether or not you live in the same home during that year.

Figuring the deduction limit and carryover.   If you are an employee, a partner, or file Schedule F (Form 1040), use the worksheet near the end of this publication to figure your deduction limit and carryover. If you file Schedule C (Form 1040), figure your deduction limit and carryover on Form 8829.

Example.   You meet the requirements for deducting expenses for the business use of your home. You use 20% of your home for this business. In 2002, your business expenses and the expenses for the business use of your home are deducted from your gross income in the following order.

You can deduct all of the business part of your deductible mortgage interest and real estate taxes ($3,000). You also can deduct all of your business expenses not related to the use of your home ($2,000). Additionally, you can deduct all of the business part of your expenses for maintenance, insurance, and utilities, because the total ($800) is less than the $1,000 deduction limit. Your deduction for depreciation for the business use of your home is limited to $200 ($1,000 minus $800) because of the deduction limit. You can carry over the $1,400 balance and add it to your depreciation for 2003, subject to your deduction limit in 2003.

More than one place of business.   If part of the gross income from your trade or business is from the business use of part of your home and part is from a place other than your home, you must determine the part of your gross income from the business use of your home before you figure the deduction limit. In making this determination, consider the time you spend at each location, the business investment in each location, and any other relevant facts and circumstances.

If your home office qualifies as your principal place of business, you can deduct your daily transportation costs between your home and another work location in the same trade or business. For more information on transportation costs, see Publication 463, Travel, Entertainment, Gift and Car Expenses.

Deducting Expenses

If you qualify to deduct expenses for the business use of your home, you must divide the expenses of operating your home between personal and business use. This section discusses the types of expenses you may have and gives examples and brief explanations of these expenses.

Types of Expenses

The part of a home operating expense you can use to figure your deduction depends on both of the following.

• Whether the expense is direct, indirect, or unrelated.
• The percentage of your home used for business.

The following table describes the types of expenses you may have and the extent to which they are deductible.

Form 8829 and the deduction worksheet (both illustrated near the end of this publication) have separate columns for direct and indirect expenses.

Expenses related to tax-exempt income.   Generally, you cannot deduct expenses that are related to tax-exempt allowances. However, if you receive a tax-exempt parsonage allowance or a tax-exempt military allowance, your expenses for mortgage interest and real estate taxes are deductible under the normal rules. No deduction is allowed for other expenses related to the tax-exempt allowance.

If your housing is provided free of charge and the value of the housing is tax-exempt, you cannot deduct the rental value of any portion of the housing.

Examples of Expenses

Certain expenses are deductible whether or not you use your home for business. If you qualify to claim business use of the home expenses, you can use the business percentage of these expenses to figure your total business use of the home deduction. These expenses include the following.

• Real estate taxes.
• Deductible mortgage interest.
• Casualty losses.

Other expenses are deductible only if you use your home for business. You can use the business percentage of these expenses to figure your total business use of the home deduction. These expenses generally include (but are not limited to) the following.

• Depreciation (covered under Depreciating Your Home, later).
• Insurance.
• Rent.
• Repairs.
• Security system.
• Utilities and services.

Real Estate Taxes

To figure the business part of your real estate taxes, multiply the real estate taxes paid by the percentage of your home used for business.

For more information on the deduction for real estate taxes, see Publication 530, Tax Information for First-Time Homeowners.

Deductible Mortgage Interest

To figure the business part of your deductible mortgage interest, multiply this interest by the percentage of your home used for business. You can include interest on a second mortgage in this computation. If your total mortgage debt is more than $1,000,000 or your home equity debt is more than $100,000, your deduction may be limited. For more information on what interest is deductible, see Publication 936, Home Mortgage Interest Deduction.

Casualty Losses

If you have a casualty loss on your home that you use for business, treat the casualty loss as a direct expense, an indirect expense, or an unrelated expense, depending on the property affected.

• Direct expense. If the loss is on the portion of the property you use only in your business, use the entire loss to figure the business use of the home deduction.
• Indirect expense. If the loss is on property you use for both business and personal purposes, use only the business portion to figure the deduction.
• Unrelated expense. If the loss is on property you do not use in your business, do not use any of the loss to figure the deduction.

If you are filing Schedule C (Form 1040), get Form 8829 and follow the instructions for casualty losses. If you are an employee, a partner, or you file Schedule F (Form 1040), use the worksheet near the end of this publication. You will also need to get Form 4684, Casualties and Thefts.

For more information on casualty losses, see Publication 547, Casualties, Disasters, and Thefts.

Insurance

You can deduct the cost of insurance that covers the business part of your home. However, if your insurance premium gives you coverage for a period that extends past the end of your tax year, you can deduct only the business percentage of the part of the premium that gives you coverage for your tax year. You can deduct the business percentage of the part that applies to the following year in that year.

Rent

If you rent the home you occupy and meet the requirements for business use of the home, you can deduct part of the rent you pay. To figure your deduction, multiply your rent payments by the percentage of your home used for business.

If you own your home, you cannot deduct the fair rental value of your home. However, see Depreciating Your Home, later.

Repairs

The cost of repairs that relate to your business, including labor (other than your own labor), is a deductible expense. For example, a furnace repair benefits the entire home. If you use 10% of your home for business, you can deduct 10% of the cost of the furnace repair.

Repairs keep your home in good working order over its useful life. Examples of common repairs are patching walls and floors, painting, wallpapering, repairing roofs and gutters, and mending leaks. However, repairs are sometimes treated as a permanent improvement. See Permanent improvements, later, under Depreciating Your Home.

Security System

If you install a security system that protects all the doors and windows in your home, you can deduct the business part of the expenses you incur to maintain and monitor the system. You also can take a depreciation deduction for the part of the cost of the security system relating to the business use of your home.

Utilities and Services

Expenses for utilities and services, such as electricity, gas, trash removal, and cleaning services, are primarily personal expenses. However, if you use part of your home for business, you can deduct the business part of these expenses. Generally, the business percentage for utilities is the same as the percentage of your home used for business.

Telephone.   The basic local telephone service charge, including taxes, for the first telephone line into your home is a nondeductible personal expense. However, charges for business long-distance phone calls on that line, as well as the cost of a second line into your home used exclusively for business, are deductible business expenses. You can deduct these expenses even if the expenses for the business use of your home do not qualify for the deduction. Deduct these charges separately on the appropriate schedule. Do not include them in your home office deduction.

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