When spouses file joint income tax returns, they are jointly and severally liable for the taxes, interest, and penalties on those returns (Code §6013(d)(3)). Even if they subsequently divorce and have an agreement requiring one spouse to pay, this does not relieve the other spouse from liability; the IRS is not a party to the agreement. However, one spouse may escape liability by qualifying for innocent spouse relief (Code §6015). The rules for innocent spouse relief are not new. However, there have been some developments—a revised form, various court decisions, and a recommendation from the National Taxpayer Advocate.