I failed to deduct estimated taxes last year 2020. How do I rectify that this year?

I failed to deduct estimated taxes I paid in 2020. How do I get that refunded this year?

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You do not claim these 2020 estimated taxes on your 2021 tax return.

The IRS will most likely detect this error when they check with their records and will adjust your refund. In case they do not, you will need to amend your 2020 tax return.

Please read this TurboTax Help topic on how to amend your 2020 tax return.

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I moved to US on Nov 1 2023. A total of $2468 was deducted towards federal income tax. When I inserted $2468 as estimated tax payment it showed my total refund as $4598

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I failed to deduct estimated taxes last year 2020. How do I rectify that this year?