Use Schedule J (Form 1040) to elect to figure your income tax by averaging, over the previous 3 years (base years), all or part of your taxable income from your trade or business of farming or fishing. This election may give you a lower tax if your income from farming or fishing is high and your taxable income for one or more of the 3 prior years was low.
In order to qualify for this election, you are not required to have been in the business of farming or fishing during any of the base years.
You may elect to average farming or fishing income even if your filing status was not the same in the election year and the base years.
This election does not apply when figuring your tentative minimum tax on Form 6251. Also, you do not have to recompute, because of this election, the tax liability of any minor child who was required to use your tax rates in the prior years.
If you have further questions about Schedule J, you may review the Schedule J Instructions