From: http://www.forbes.com/sites/maggiemcgrath/2015/05/15/what-th...

"Only about half of American workers have access to a 401k, which is a workplace savings plan that lets employees invest a portion of their paycheck before taxes are taken out. The savings can grow tax free until retirement, at which point withdrawals will be taxed as ordinary income. A large majority of employers will match an employee’s contribution – up to a point – thereby boosting the employee’s savings rate."