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Did you and your wife file a joint tax return? If you did, then you are both responsible for what was reported, or not reported, on that tax return. If you did not file a joint return or have not filed a return yet, you may want to consider filing married filing separate if you do not want to be responsible for her income tax liability.
Do keep in mind that there are some credits and deductions, such as earned income credit and education credits, that are not allowed on a married filing separate return. You should weigh the pros and cons of filing MFJ and MFS before making the decision.
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