Often, yes. The IRS figured it as if your income was even all year. If it was not, send Form 2210 with Schedule AI to the address on the notice.
A CP30 notice means the IRS charged the estimated tax underpayment penalty and took it out of your refund or added it to what you owe. It is not the final word. The IRS computes the penalty with the regular method, which assumes a quarter of your income arrived in each period. The notice page itself says the penalty can be reduced or removed when income was uneven, when withholding was concentrated early in the year, or when a waiver applies.
If your income came in unevenly, the annualized income method is the fix. Complete Form 2210 for the year on the notice, check box C, attach Schedule AI showing your income as of March 31, May 31, August 31, and December 31, and mail it to the address on the notice with a short letter quoting the notice number. If most of your withholding happened early in the year, check box D instead and list the actual withholding dates.
A waiver is the other route. The IRS will remove the penalty for someone who retired after age 62 or became disabled in the last two years with reasonable cause, or where a casualty, disaster, or other unusual circumstance caused the underpayment. Send Form 2210 with box A or B checked and a signed written explanation with the records that back it up. First-time penalty abatement does not cover this penalty.
Pay the part you agree with while the request is pending, because interest runs on an unpaid penalty and paying does not give up the right to ask. If the recomputed penalty is lower, the IRS adjusts the account and refunds the difference. Our guide on lowering an underpayment penalty covers each ground in detail.
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Sources: Understanding your CP30 notice· IRS underpayment penalty· Form 2210 instructions