IRS 2023 Instructions for Form 2210 , page 8, here states:
If your income varied during the year because, for example, you operated your business on a seasonal basis or had a large capital gain late in the year, you may be able to lower or eliminate the amount of one or more required installments by using the annualized income installment method. Use Schedule AI to figure the required installments to enter on Form 2210, Part III, line 10.
You may need to refer to paystubs, bookkeeping records and/or banking records to determine the income reported for each period.
Your income must be allocated across the following periods.
- Period (a) includes items for January 1 through March 31.
- Period (b) includes items for January 1 through May 31.
- Period (c) includes items for January 1 through August 31.
- Period (d) includes items for the entire year.
Note. Each period (see the top of Schedule AI) includes amounts from the previous period(s).
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