Was your income approximately equal in all 4 quarters of 2021?
Did you have an unusually large amount of taxable income in one or more quarters? Especially the 3rd or 4th quarter? This includes things like a large capital gain, IRA withdrawal or other taxable events like these.
If so, you may be able to reduce the underpayment penalty amount by completing Form 2210 - Underpayment of Estimated Tax. Use this form to report the income you received in the appropriate quarter of 2021.
Also, You can consider an appeal of the penalty, if you qualify. See the following links for more info.
https://www.irs.gov/appeals/penalty-appeal
https://www.irs.gov/payments/penalty-relief
https://www.irs.gov/payments/underpayment-of-estimated-tax-by-individuals-penalty
https://www.irs.gov/publications/p505 Tax Withholding and Estimated Tax.
https://www.irs.gov/businesses/small-businesses-self-employed/penalty-relief-due-to-reasonable-cause
https://www.irs.gov/businesses/small-businesses-self-employed/penalty-relief-due-to-first-time-penal...
If the above does meet your needs and you want more specific advice, please respond with info from the penalty notice you received from the IRS and the reason for the penalty. If you do not have a penalty notice, look at the notice the IRS sent outlining the changes they made to your return and how that resulted in the penalty, and what the penalty amount was, relative to your taxable income and total taxes owed.
good luck.
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