The Internal Revenue Service’s electronic system that many people use to file their taxes online had a partial failure on Tuesday, the last day American can file their taxes.

The issue could make it harder for millions of Americans trying to file before the midnight deadline.

"On my way over here this morning, I was told a number of systems are unavailable at the moment," IRS Acting Commissioner David Kautter told the House Oversight and Government Reform Committee on Tuesday. "We are working to resolve the issue and taxpayers should continue to file their returns as they normally would."

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A congressional official told The Washington Post that the IRS will attempt a "hard reboot" of its system that they hope will fix the issue.

The IRS has said that, at this point, all indications are that the problems are due to a hardware issue.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Powell, Mnuchin stress limits of emergency loans | House seeks to salvage vote on spending bill | Economists tell lawmakers: Kill the virus to heal the economy Economists spanning spectrum say recovery depends on containing virus Powell, Mnuchin stress limits of current emergency lending programs MORE said Tuesday afternoon that Americans who were unable to pay their taxes because of the “high-volume technical issue” will get an extension when the site is running correctly again, the Associated Press reported.

The AP reported that the IRS website had been down most of the day and wasn’t operational as of 4:30 p.m.

Kautter noted that even though the deadline for Americans to file their taxes is Tuesday, they can still request a six-month extension on the IRS’s website.

He also said that people would not be penalized if their returns arrive late because of the system glitches, according to the Los Angeles Times.

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"If we can't solve it today, we'll figure out a solution," Kautter said. "Taxpayers would not be penalized because of a technical problem the IRS is having."

On the last day of last year’s tax filing season, the IRS received five million returns.

Some lawmakers had also said earlier in the day that the IRS should provide a grace period so that Americans who have issues filing their taxes because of the IRS’s systems failures are not penalized.

Ways and Means Committee Ranking Member Richard Neal Richard Edmund NealRep. Bill Pascrell named chair of House oversight panel Rep. Cedric Richmond set to join House Ways and Means Committee Coons beats back progressive Senate primary challenger in Delaware MORE (D-Mass.) said that he hopes the IRS "will make accommodations so that every taxpayer attempting to file today has a fair shot to do so without penalty."

"Americans should not be punished for being unable to file their tax returns or pay their tax bills today," Senate Finance Committee Ranking Member Ron Wyden Ronald (Ron) Lee WydenGOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate GOP senator blocks Schumer resolution aimed at Biden probe as tensions run high MORE, (D-Ore.) said.

Wyden added that while it isn’t clear what is causing the IRS’s systems failure, Republicans’ lack of funding for the IRS “will only compound the issue."

Naomi Jagoda contributed reporting.