What happens if my previous employer didnt take out any federal taxes?

Dammit I'm bad with names, but your first answer is right. I would just like to add a bit of info from personal experience. I/we used to have a company and it was a requirement to file your taxes from wages every quarter. The times you file can vary,but you are required to do so if you have employees unless you are giving them a1099 at the end of the year. That would mean you would have to pay all of your taxes yourself, meaning double social security and FICA. I would consider asking the IRS if that is a reason to file a complaint. That is a very rotten thing to do to your employee.