2013 Making Working Pay Credit Act - Amends the Internal Revenue Code to: (1) revive in calendar year 2013 the making work pay tax credit, (2) establish the amount of such credit as the lesser of 6.0% of earned income or $800 in a taxable year ($1,600 for married couples filing jointly), and (3) require a reduction of such credit for taxpayers whose modified adjusted gross income exceeds $60,000 ($90,000 for married couples filing jointly).