For most filers, if your federal tax withholdings and timely payments are not equal to 90% of your current year tax, or 100% of the total tax from the prior year (whichever is less), then you may need to complete Form 2210 to determine if you are required to pay an underpayment penalty.
If your current year total tax minus the amount of tax you paid through withholding is less than $1,000, you are not required to pay the underpayment penalty and do not need to complete Form 2210.
It may help in some situations, such as it did in yours, to go through the Underpayment Penalty section and answer the interview questions. The program will calculate a penalty automatically based on just the amounts and dates paid and the amount of tax due, but the penalty may be reduced depending on the answers to the questions.
See this TurboTax tips article for more information about Form 2210.
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