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Even though he is incarcerated, he is still required to file a return and pay tax. Since you are married, this is likely martial income, especially since you've been filing jointly.
An exception will be if you file for "innocent spouse relief," meaning the taxable income was tied to your husband's criminal wrongdoing, and you ask the IRS to determine that only he should be liable for that portion of the taxes. If granted, you are not responsible for any income incurred solely by him.
You can request innocent spouse relief by filing a form 8857, which can be found on the IRS website.
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