The signatures required on an IRS refund check vary by the check's payee and your bank policies. You usually can't sign your spouse's name. If a check is written solely to your spouse, she must sign the check. If the check is written to both of you, bank policies might vary on signature requirements.
Many banks require that both parties sign a check that is written to two people. While some local banks are more lenient with personal checks or checks of small value, they are likely to have more diligence with an IRS refund check. Some banks even require that both parties show identification at the branch when signing a check, especially if you want cash back.
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