When you file at the end it may be offered to you. Not everyone can get it. You can't self select it. Then you don't get it until AFTER your efile is Accepted by the IRS. This link explains it all and the amount you can get. Read the whole page and the FAQs listed....
https://ttlc.intuit.com/community/refunds/help/about-refund-advance/00/27333
