If you are filing Married filing Separate, your spouse files his own return. You will need to enter his personal information (name and SSN) on your return, but you don't include any of his tax data. You said you have to file separately, but if you were married as of 12/31/23, you can file jointly with your spouse, which in most cases is a much better choice. MFJ vs. MFS. Please review this article.
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