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If it is not postmarked by midnight tonight on 4-15-2025 the refund will be forfeited. 2021 cannot be e-filed.
2021
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
Here is the IRS 2021 Form 1040
https://www.irs.gov/pub/irs-prior/f1040--2021.pdf
or if you want bigger type use 1040SR for Seniors,
https://www.irs.gov/pub/irs-prior/f1040s--2021.pdf
And 2021 Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2021.pdf
2021 Tax and EIC Tables
https://www.irs.gov/pub/irs-prior/i1040tt--2021.pdf
Sch 1 : https://www.irs.gov/pub/irs-prior/f1040s1--2021.pdf
Sch 2 : https://www.irs.gov/pub/irs-prior/f1040s2--2021.pdf
Sch 3 : https://www.irs.gov/pub/irs-prior/f1040s3--2021.pdf
To file your 2021 tax return using TurboTax, you'll need to use their desktop software, as the online version only supports the current tax year. Here are the steps:
Purchase and Download TurboTax Desktop Software:
For more detailed guidance, you can refer to the TurboTax Help Article on Filing Prior Year Returns
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