The 2016 Statistics of Income Report for 2016 was released by the IRS on August 31. The data includes sources of income, adjusted gross income, exemptions, deductions, taxable income, income tax, modified taxable income, tax credits, self-employment tax, and tax payments. A copy of the report is available here.
The IRS also released Publication, 4801, The Individual Income Tax Returns, Line Item Estimates. The data includes corresponding dollar amounts of selected lines filed in concurrence with the number of returns filed. Publication 4801 is available here.