However, if your spouse made major mistakes — such as underreporting income, failing to report earnings, or falsely claiming deductions or credits — you may qualify for protection under Innocent Spouse Relief.
Innocent Spouse Relief is an IRS provision that removes your obligation to pay tax, interest, or penalties resulting from your spouse’s or ex-spouse’s inaccurate or fraudulent reporting on a joint return.
This relief only applies to individual income and self-employment taxes. It does not cover business taxes, household employment taxes, trust fund recovery penalties, or Individual Shared Responsibility payments.

To be eligible:
More details are available in IRS Publication 971, which outlines the full criteria and documentation requirements.
Generally, you must apply for Innocent Spouse Relief within two years of the IRS beginning collection efforts for the unpaid taxes. You’ll also need to demonstrate that you neither knew nor had reason to know of the error when signing the return.
When evaluating fairness, the IRS will look at multiple factors, including:
• The nature and size of the error
• Your financial situation
• Your education level
• Your marital status
• Whether there’s a recurring pattern of similar behavior
Because these cases can be complex and difficult to prove, it’s best to work with a qualified tax professional who can help gather evidence, prepare your case, and communicate effectively with the IRS.