You can treat state income taxes paid in 2023 as an itemized deduction on your federal tax return in 2023 even it they apply to another tax year. You can deduct up to $10,000 total in state income and property taxes on your federal return in 2023. They will only benefit you if you have more in itemized deductions than the amount of your standard deduction.
You enter them in the Deductions and Credits section of TurboTax, then Estimates and Other Taxes Paid, then Estimates. Use the Visit All option and search for the description that fits the type of payment you did.
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