Prior year returns (2015 tax year and forward) may be electronically filed by those using the TaxAct Professional program (both individual 1040 returns and business (1041, 1065, 1120S, 1120, and 990 returns) or by those using the TaxAct Business Consumer (1041, 1065, 1120S, 1120, and 990 returns) program.  While the IRS now allows year-round electronic filing with the new MeF system, they do shut down for a short period for maintenance each year from later in November to sometime around the end of January.

Each year the TaxAct program will allow electronic submissions for prior year returns as soon as the Final version of the software is released in January; however, the returns will not actually be transmitted to the IRS until they are ready to start processing them.