The checks were sent out months ago, but about nine million Americans who are entitled to a $1,200 stimulus check from the U.S. government didn’t get one. Those folks have until 3 P.M. tomorrow (Saturday) to register for their Economic Impact Payment, good for $1,200 plus $500 for each child. The people left out of the mass mailing generally don’t file tax returns because their income is too low for them to owe anything. Many are senior citizens or college students. The IRS has a form online to register for payment.