Get your taxes done using TurboTax

For most filers, if your federal tax withholdings and timely estimated 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. You might double-check the dates of the estimated tax payments entered.

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:

• You or your spouse (if you file a joint return) retired in the past 2 years after reaching age 62 or became disabled and you had reasonable cause to underpay or pay your estimated tax late. See Waiver of Penalty in Instructions for Form 2210PDF.
• You had most of your income tax withheld early in the year instead of spreading it equally through the year. 
• Your income varies during the year. Complete Form 2210, Schedule AI, Annualized Income Installment Method PDF(found within the form).

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