A bipartisan group of House Ways and Means Committee lawmakers have given the IRS a deadline of May 4 to answer questions related to the April 17 technical glitches that led to the one-day extension of the tax-filing deadline.

Questions include how the IRS identified and fixed the trouble, how old was the system hardware that failed, if software problems were combined with the hardware failure — and if taxpayer data was compromised.

“While we were relieved that the IRS resumed operations of the impacted, electronic services by the end of Tax Day and provided a deadline extension to taxpayers, we would like to understand how this significant disruption of service transpired,” the April 24 letter said.

Also, the House on April 18 passed bipartisan legislation aimed to modernize and improve IRS customer service and information technology.

“With a new tax code, it is time for a redesign of our tax agency,” Ways and Means Committee Chairman Kevin Brady (R-Texas) said. “This bipartisan legislation truly refocuses the IRS to make it a ‘taxpayer first’ agency.”

“This experience showed the nation how important it is that Congress invest in the IRS system and operation,” said Rep. John Lewis (D-Ga.), the top Democrat on the Ways and Means oversight subcommittee.