When will the IRS start accepting e-filed returns?
The IRS has started processing e-filed returns. More info
Please note that it'll take several days for the IRS to work through the enormous backlog of early-filed returns, so don't be alarmed if your return seems "stuck" in pending status for awhile. Millions of other filers will be in the same boat. Just hang in there and the IRS will eventually get to your return.