California calculates the underpayment penalty on the unpaid amount from one of these (whichever is earlier:(
- The due date of the estimated tax installment to the date they receive your payment
- The due date of the tax return
Visit Individuals due dates for the due dates.
The number of days late is first determined, then multiplied by the effective interest rate for the installment period. Visit interest rates for more information.
To avoid this in the future, increase your withholdings or make quarterly estimate payments.
In the future, if you see an underpayment penalty on your state return, go to the Underpayment Penalty section in the California interview (it may only appear if TurboTax calculates a penalty). There, you can answer the questions to determine if there is a basis to reduce or eliminate the penalty.
Because various items of income and deductions are treated differently by the IRS and the states, you can input changes for your state estimated taxes in the state section of TurboTax.
The California section, Estimated Taxes for Next Year under Other Forms, provides entry screens with information about your 2024 Federal and California income, and an entry field for 2025 estimated income, as well as entry fields to estimate deductions and credits, including California credits such as the Renter's Credit. It also provides a radio button for you to indicate whether you expect to have itemized or standard deductions. Many California taxpayers are able to itemize on their state return even though they couldn't on their Federal return.
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