When a married couple files a joint tax return, each spouse is “jointly and severally” liable for the full amount of tax on the couple’s combined income. That means the IRS can pursue either spouse to collect the entire tax, not just the part that’s attributed to one spouse or the other. This includes any tax deficiency that the IRS assesses after an audit, as well as any penalties and interest. In some cases, however, one spouse may be eligible for “innocent spouse relief.” This generally occurs when one spouse was unaware of a tax understatement that was attributable to the other spouse.

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