If you are married, but you file "Married Filing Separately (MFS), your husband does not need to sign that return. If you are considered "Unmarried" your husband does not need to sign the return.
According to the IRS:
"Marital Status
In
general, your filing status depends on whether you are considered unmarried or
married.
Unmarried persons.
You are considered unmarried for the whole year if,
on the last day of your tax year, you are either:
- Unmarried,
or
- Legally
separated from your spouse under a divorce or separate maintenance decree.
State law governs whether you are married or legally
separated under a divorce or separate maintenance decree."
