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What is the annualized income installment method for Form 2210?

Contributed by: TriciaD, FreeTaxUSA Agent, Tax Pro

Landscaper holding hedge trimmers, representing seasonal self-employment income likely eligible for the annualized method.

If you didn’t pay enough tax during the year through withholding or estimated tax payments, the IRS may charge an underpayment penalty. Form 2210 is used to figure the penalty. In many cases, the IRS can calculate the penalty for you and send a notice later. However, you may choose to complete and file Form 2210 yourself if you qualify for a reduced penalty or want to request a waiver.

One way to reduce the penalty is by using the annualized income installment method on Schedule AI of Form 2210.

When can the annualized method help?

The annualized method may help if your income changed or fluctuated during the year. It’s often useful if you had income from:

Self-employment or freelance work
Seasonal business activity
Bonuses or commissions
Capital gains from selling stock, cryptocurrency, real estate, or other investments
Retirement distributions taken later in the year
Rental income received unevenly during the year

The method doesn’t lower your total tax for the year. Instead, it may lower or remove an underpayment penalty by showing the IRS when your income was actually earned. It only helps show when you were required to pay the tax.

What is Schedule AI and how is it used to calculate the underpayment penalty?

The regular Form 2210 method assumes you earned your income evenly all year. It compares the amount you should’ve paid to the amount you actually paid by each quarterly due date. If you didn’t pay enough for a period, the form uses the unpaid amount, how long it was unpaid, and the IRS penalty rate to figure the penalty.

Schedule AI divides the year into shorter periods called annualization periods. For each period, you enter your income, deductions, credits, taxes, withholding, and estimated tax payments that apply to each period. The IRS uses your information to figure how much tax you should’ve paid by each estimated tax deadline.

Infographic showing a horizontal flowchart illustrating an annualization process with five color-coded steps in blue, teal, green, olive, and yellow, each containing an icon and descriptive text. The steps guide through figuring income and deductions, annualizing income for each period, calculating tax for each period, comparing required payments to actual payments, and using results to determine if underpayment exists.

Example 1: Large income earned late in the year

Maria works a regular job and has tax withheld from each paycheck. In November, she sells stock and has a large capital gain. She makes an estimated tax payment in January to help cover the extra tax from the sale.

Using the regular Form 2210 penalty calculation, it may look as if Maria should’ve paid part of that tax earlier in the year. With the annualized method, she can show the income was earned near the end of the year. This may reduce or remove the penalty for earlier quarters.

Example 2: Seasonal self-employment income

Devon owns a landscaping business. He earns most of his income from April through September and has very little income during the winter.

If Devon makes equal estimated tax payments all year, the regular method may work fine. But if he pays more tax after his busy season starts, Schedule AI may better match his payments to when he earns his income.

By annualizing his income, Devon can show he didn’t need to pay as much during the first part of the year because he hadn’t earned much income yet.

In this image, the underpayment penalty on Form 2210 is $180 before using the annualized income installment method.

Infographic of Form 2210, Underpayment of Estimated Tax illustrating decision process for individuals, estates, and trusts to determine if Form 2210 must be filed for underpayment of estimated tax in 2025. Includes yes/no questions guiding through penalty assessment, with key sections for penalty calculation, required annual payment amounts, and instructions for waivers and exceptions, using black text and lines on white background.

Infographic of a tax form table titled "Penalty Computation" Part III showing columns for payment due dates and rows for various penalty calculation steps. The table includes specific monetary values for underpayment amounts and penalties across four quarterly dates, with clear labels for each row and column to guide users through penalty assessment.

After Schedule AI is completed, Form 2210 shows the penalty reduced to $67.

Infographic showing Form 2210 tax worksheet for 2025 shows underpayment of estimated tax by individuals, estates, and trusts. It includes taxpayer names, filing questions, and a detailed annual payment section with amounts in black text and boxed totals, highlighting a total required annual payment of $20,975 and penalties related to underpayment.

Infographic of a tax form titled "Form 2210 (2025)" showing Part III Penalty Computation with sections for underpayment calculations and penalty figures. The form includes a table with labeled columns for payment due dates and rows for installment amounts, underpayment, and overpayment values, highlighted by numerical entries and instructions for taxpayers.

Infographic of a tax form table titled "Schedule AI—Annualized Income Installment Method" showing instructions and columns for income installment calculations across five periods in 2025. The table includes labeled rows for income entries, deductions, credits, and tax calculations with numerical values and percentages, highlighted by boxed totals and formulas for annualized income tax computation.

Infographic of a completed IRS Form 2210 Part III Section B penalty worksheet calculating underpayment penalties for tax periods from April 15, 2025, to January 15, 2026. The worksheet includes columns for payment due dates, underpayment amounts, number of days late, and penalty calculations, with a total penalty of $67.1 shown at the bottom.

Do you have to file Form 2210?

Not always. The IRS usually figures the underpayment penalty for you if you don’t file Form 2210. However, you may need to complete and attach Form 2210 if you’re using the annualized income installment method, requesting a waiver, or meeting another situation listed in the Form 2210 instructions.

How to enter annualized income information in FreeTaxUSA

Because you’ll need to know your income, deductions, credits, self-employment tax, withholding, and estimated tax payments by date, you may need more detailed records than you’d need for a regular tax return.

To enter your information, follow these steps:

Follow menu path Misc > Payments > Underpayment Penalty (Form 2210).
Select Yes for the question, Do you want to answer questions that may reduce or eliminate your underpayment penalty? Answer the other questions on this page, then click Save and Continue.
Enter the information from your prior-year tax return, then click Save and Continue.
On the Do you qualify for any exceptions? screen, select Yes for the question under the Annualized Income Installment Method heading.
If you’ve finished entering your federal tax information, answer Yes on the next page, then click Save and Continue.
Continue through each screen and enter your information until you reach the Underpayment Summary page.

The software uses your entries to determine whether Form 2210 or Schedule AI is needed.

What records do you need?

To use the annualized method, keep records that show when you received income and when you paid expenses. Helpful records may include:

Infographic showing withholding by pay period. Timely estimated tax payments. Business income and expenses. Brokerage statements showing sale dates, gains, and losses. Retirement distribution forms and payment dates. Records for deductions and credits tied to specific parts of the year.

Key takeaways

The annualized income installment method is used on Schedule AI of Form 2210.
It can help if your income was uneven during the year.
It doesn’t reduce your total tax, but it may reduce or remove an underpayment penalty.
You’ll need detailed records showing income, deductions, credits, withholding, and estimated tax payments by date.
If your income was steady all year, the regular Form 2210 method may give the same result.