Form 2210 is the IRS Form for the reporting and calculation of the penalty for Underpayment of Estimated Tax. You can look at the actual IRS form here. See this TurboTax tips article for more information about Form 2210.
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.
If TurboTax is showing an underpayment penalty on your return, visit or revisit the Underpayment Penalty section under Other Tax Situations and answer the interview questions. The penalty calculation may change based on your answers, including information about when your withholding was applied. In addition, if you believe you qualify for a waiver of the penalty, you can request a waiver in that section.
The IRS may reduce an underpayment penalty if any of the following apply:
The penalty for underpayment of estimated tax can also be removed to the extent that the underpayment is the result of a casualty, local disaster, or other unusual circumstance such that it would not be fair to impose the penalty.
See here for information about different TurboTax tools you can use to calculate withholding and estimated taxes.
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