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About Form 843, Claim for Refund and Request
Jan 21, 2025 Use Form 843 to claim a refund or request an abatement of certain taxes, interest, penalties, fees, and additions to tax.
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Form 4466 (Rev. October 2018)
File Form 4466 after the end of the corporations tax year, and no later than the due date for filing the corporations tax return (not including extensions).
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Form 843, Claim for Refund and Request for Abatement
If you are filing Form 843 to request a refund or abatement relating to a joint return, both you and your spouse must sign the Form. 843. Forms 843 filed by
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