You would only be able to deduct your state income taxes paid if you itemize your deductions on Schedule A. If you take the standard deduction, you cannot deduct the taxes. In addition, the SALT (state and local tax) deduction is capped at $10,000. That means if the combined total of your state tax, real estate tax, and personal property tax amounts to $15,000, you can only deduct $10,000 maximum.
The estimated payments for the other three quarters within 2021 are deductible on your federal return (if you itemize).
For more information, please see Can I deduct state or local income tax on my federal return?
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