Is it reasonable/common in the USA for an employer to ask for tax return, proof of joint property, or proof of joint address to try to invalidate your marriage for HR benefits? HR policies state only proof of marriage is required, but they say they have the right to ask for any information they want to prove the marriage is legitimate in their eyes. They say not passing this audit leads to revoking insurance, and may lead to having to repay premiums or even charges for insurance fraud.