Computer problems have caused the IRS to cease accepting electronically filed tax returns until further notice:
The outage could affect refunds, but the agency said it doesn’t anticipate “major disruptions.”…”The IRS is still assessing the scope of the outage,” the agency said. “At this time, the IRS does not anticipate major refund disruptions; we continue to expect that nine out of 10 taxpayers will receive their refunds within 21 days.”
Source: USA Today