Yes, you can let TurboTax calculate the penalty even though you won't owe a penalty due to the disaster relief provisions of the IRS and the state.
If you have taxes due with your return, and a penalty for underpayment of estimated taxes is calculated by TurboTax, it will ask whether you are covered by a disaster declaration, and you can request a waiver of the penalty.
If you live in a federally declared disaster area, and met the special filing and payment deadlines for that disaster, you qualify for an automatic underpayment penalty waiver. Even if the penalty is calculated on the return, the IRS should not charge the penalty and you do not need to pay the penalty.
You can visit the Other Tax Situations section and review the Underpayment Penalty information to confirm it is correct.
See here for the IRS requirements for the California disasters for 2023.
If you get a notice from the IRS proposing to assess the penalty, see this IRS webpage for guidelines and next steps.
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