My state is an at-will employment state, so workers can be fired for any reason or no reason at all. This makes it vital to find out your own employer's or future boss's rules for punctuality. Some companies adhere to "Vince Lombardi Time" started by a famous football coach, meaning 15 minutes early is on time and any later is simply late. I know a handful of companies that require workers to arrive 30 minutes early and check their work stations during that unpaid time. Still, other companies feel that being 15 minutes late to work is fine. Some other employers offer flex time that provides an hour leeway at the start and end of each day, as long as the worker completes a full eight-hour shift. At the end of the workday, some employers will "write up" employees who leave even one minute early. All this makes it important to learn what your own company's rules are.