if you work thru the Annualized Income (AI) method for Form 2210 you basically have to calculate a mini tax return for each quarter, so to calculate your quarterly AGI for example you have to replica...
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if you work thru the Annualized Income (AI) method for Form 2210 you basically have to calculate a mini tax return for each quarter, so to calculate your quarterly AGI for example you have to replicate the income on your 1040 Lines 1-10 apportioning it by quarter, same with the capital gains and qualified dividends to get the right tax calcs. I am not sure all the nuances of doing this for self-employment situation and how to handle QBI and deductions thru the annualization process. It's generally a lot of work to go through this for 3 quarters (uneven - 3/31, 5/31, 8/31; and 12/31 is your full return) it's like doing 3 extra tax returns, so you may have to decide whether it's worthwhile to save $100 or so penalty. You may not even eliminate it if the annualization and ES payments don't line up as intended. One thing you can do is a mock up with rough quarterly estimates to see if it helps with the penalty, then refine it with more accurate numbers. When you go through those questions you'll be asked at the end if you want to adopt the AI method. This language at the end about not filing 2210... by default, Form 2210 is not filed in your return unless you are selecting one of the exceptions in Part 2 like the AI method. IRS assesses your penalty independently, they know your ES payments and will do the default safe harbor and penalty calc on Form 2210 Part 1 the same way Turbotax does assuming no other tax adjustments for some reason. To avoid this going forward, if your total income is steady or increasing from year-to-year you could pay fixed quarterly ES payments based on prior year tax then it won't matter about the timing of your income. But with this method it could be an overpayment especially if your prior year AGI is > 150k for single filer then you need to pay ES based on 110% of prior year tax, instead of 90% of current year tax. Turbotax by default will generate ES vouchers for 2026 based on 2025 tax, but you can work through other income estimates under Other Tax Situations / Form W4 and Estimated Taxes. Check also the instructions for Form 22110 which may answer some of these questions how to go about the annualization.