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Preparing Your Tax Return(s) and Information Returns

Business Taxes

Alternative Minimum Tax - Corporations


The tax laws give special treatment to some types of income and allow special deductions and credits for some types of expenses. These laws enable some corporations with substantial economic income to significantly reduce their regular tax. The purpose of the corporate alternative minimum tax (AMT) is to ensure that these corporations pay a minimum amount of tax on their economic income. A corporation owes AMT if its tentative minimum tax is more than its regular tax.

The tentative minimum tax of a small corporation is zero. This means that a small corporation will not owe AMT.

Small corporation exemption. A corporation is treated as a small corporation exempt from the AMT for its current tax year if that year is the corporation’s first tax year in existence (regardless of its gross receipts for the year) or:

  1. it was treated as a small corporation exempt from the AMT for all prior tax years beginning after 1997, and
  2. its average annual gross receipts for the 3-tax-year period (or portion thereof during which the corporation was in existence) ending before its current tax year did not exceed $7.5 million ($5 million if corporation had only 1 prior tax year).

For more information, see the Instructions for Form 4626.

Use Form 4626 to figure the tentative minimum tax of a corporation that is not a small corporation for AMT purposes.


Important References:

Publication 542    Corporations
Form 4626           Alternative Minimum Tax - Corporations
Instructions for Form 4626