Publication 583
taxmap/pubs/p583-004.htm#TXMP33d018cdAn accounting method is a set of rules used to determine when
and how income and expenses are reported. You choose an accounting method for
your business when you file your first income tax return. There are two basic
accounting methods.
- Cash method.
Under the cash method, you report income in the tax year you
receive it. You usually deduct or capitalize expenses in the tax year you pay
them.
- Accrual method.
Under an accrual method, you generally report income in the
tax year you earn it, even though you may receive payment in a later year. You
deduct or capitalize expenses in the tax year you incur them, whether or not you
pay them that year.
For other methods, see Publication 538.
If you need inventories to show income correctly, you must generally
use an accrual method of accounting for purchases and sales. Inventories include
goods held for sale in the normal course of business. They also include raw
materials and supplies that will physically become a part of merchandise
intended for sale. Inventories are explained in Publication 538.
 | Certain small business taxpayers can use the cash method
of accounting and can also account for inventoriable items as materials and
supplies that are not incidental. For more information, see Publication 538. |
You must use the same accounting method to figure your taxable
income and to keep your books. Also, you must use an accounting method that
clearly shows your income. In general, any accounting method that consistently
uses accounting principles suitable for your trade or business clearly shows
income. An accounting method clearly shows income only if it treats all items of
gross income and expense the same from year to year.
taxmap/pubs/p583-004.htm#TXMP74dae1dbWhen you own more than one business, you can use a different
accounting method for each business if the method you use for each clearly shows
your income. You must keep a complete and separate set of books and records for
each business.
taxmap/pubs/p583-004.htm#TXMP6902f4c3Once you have set up your accounting method, you must generally
get IRS approval before you can change to another method. A change in accounting
method not only includes a change in your overall system of accounting, but also
a change in the treatment of any material item. For examples of changes that
require approval and information on how to get approval for the change, see
Publication 538.