Filing separate returns in this situation would protect you from your husband's previous tax debts.
Or, another choice could be to file a joint tax return and include the Injured Spouse form as part of your return. That would prevent your refund from being seized to pay his tax debt.
Take a look at the following TurboTax articles to learn more:
Is it better for a married couple to file jointly or separately?
How do I file Form 8379, Injured Spouse Allocation?
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