I purchased a computer last year to do online day trading part-time from home for additional income. Can I deduct or depreciate the cost of the computer or internet connection from my investment income?

You may deduct investment expenses (other than interest expenses) as miscellaneous itemized deductions on Form 1040, Schedule A (PDF), line 22, Itemized Deductions. This would include depreciation on the portion of your computer used for investment purposes, and the portion of your internet access charges used for investment purposes.

The entire acquisition cost of a computer purchased for business use can be expensed under Code section 179 in the first year if qualified, or depreciated over a 5-year recovery period. Under section 179, you can elect to recover all or part of the cost of certain qualifying property, up to a dollar limit, by deducting it in the year you place the property in service. You can elect to expense the cost of qualifying property instead of recovering the cost by taking depreciation. To claim the expense in the first year, the property must be used more than 50% for business use (as opposed to investment use), and meet the other requirements for expensing. One of those requirements is that the total cost of qualifying property you can deduct after you apply the dollar limit is limited to the taxable income from the active conduct of any trade or business during the year. Any cost not deductible in one year under section 179 because of the business income limit can be carried to the next year.

The 2003 Jobs and Growth Act raised the aggregate cost that can be expensed for any tax year beginning after 2002 and before 2006 to $100,000. The new law also expanded the definition of Code Section 179 property to include off-the-shelf computer software. See Code Section 179 for the expanded definition. If the business use falls to 50% or less in a later year, these tax benefits may be subject to recapture. See Publication 946 , How to Depreciate Property for additional information on the section 179 deduction.

Because these deductions are for investment expenses rather than for business expenses, these deductions must be reduced by 2% of your adjusted gross income. Use Form 4562 (PDF), Depreciation and Amortization, to compute the depreciation for the portion of your computer used for investment purposes.

Note: Unless the computer is used more than 50% for business purpose (as opposed to investment purposes), you cannot claim section 179 expensing of the computer or claim accelerated depreciation (including the special depreciation) for it. For more information, refer to "Listed Property" in Publication 946, How to Depreciate Property.

I have a home office. Can I deduct expenses like mortgage, utilities, etc., but not deduct depreciation so that when I sell this house, the basis won't be affected?

If you qualify to deduct expenses for the business use of your home, you can claim depreciation for the part of your home that is a home office. Generally, the part of your home that is a home office is depreciated over a recovery period of 39 years using the straight line method of depreciatiion and a mid-month convention. If you do not claim depreciation on that part of your home that is a home office, you are still required to reduce the basis of your home for the allowable depreciation of that part of your home that is a home office when reporting the sale of your home. For more information, refer to Publication 587, Business Use of Your Home.

I use my home for business. Can I deduct the expenses?

To deduct expenses related to the business use of part of your home, you must meet specific requirements. Even then, your deduction may be limited.

Your use of the business part of your home must be:

Exclusive (see *exceptions below),

Regular,

For your trade or business, AND

The business part of your home must be one of the following:

Your principal place of business,

A place where you meet or deal with patients, clients, or customers in the normal course of your trade or business, or

A separate structure (not attached to your home) you use in connection with your trade or business.

Additional tests for employee use. If you are an employee and you use a part of your home for business, you may qualify for a deduction. You must meet the tests discussed above plus:

Your business use must be for the convenience of your employer, and

You do not rent any part of your home to your employer and use the rented portion to perform services as an employee.

Whether the business use of your home is for your employer's convenience depends on all the facts and circumstances. However, business use is not considered to be for your employer's convenience merely because it is appropriate and helpful.

*exceptions

You do not have to meet the exclusive use test if you satisfy the rules that apply in either of the following circumstances.

You use part of your home for the storage of inventory or product samples.

You use part of your home as a day-care facility.

Form 1040, Schedule C (PDF) filers calculate the business use of home expenses and limits on Form 8829 (PDF) . The deduction is claimed on line 30 of Schedule C. Employees claim deduction for business use of home as an itemized deduction on Form 1040, Schedule A (PDF) .

For more information refer to Tax Topic 509 , Business Use of Home, or Publication 587 , Business Use of Your Home (Including Use by Day-Care Providers).