No, Only the spouse would include their income on your tax return. You can list a dependent (if they meet the criteria) on your tax return that isn't your spouse. But they would file their own tax return for any income.

Question

Can I add an adult (like a spouse,but not married) that had a 10-99 form?

Forum|Forum|1 year ago
March 25, 2025
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JohnB5677

No, Only the spouse would include their income on your tax return.

You can list a dependent (if they meet the criteria) on your tax return that isn't your spouse.
But they would file their own tax return for any income.

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xmasbaby0

Please explain what you mean by "add an adult" and what you mean by "like a spouse, but not married". If you are not legally married you cannot file a joint return if that is what you are asking to do.

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