Here's the thing. Most places won't check. By the time you are hired, they want you and don't want to do anything to derail that process... Until they do. Years down the line, anything you put in your application is fair game to fire you "for cause." When you piss off the wrong person, or economics change, that's when they might ask you to "prove" anything you said with an old tax return (redacted), background check, etc. Its a remote possibility but like anything else in this world, its the 1 in 1000 audit that keeps most people honest.