The Internal Revenue Service isn’t the most technologically sophisticated government agency in the US. As evidence, check out its online payment system, called Direct Pay, that still remains out of service on the tax filing deadline day for the entire country, as noted by Engadget. The Direct Pay system went down sometime early this morning as part of a widespread failure of the IRS’s electronic filing system, due most likely to a technical glitch possibly related to the huge influx of people trying to file returns. The system was down for much of Tuesday, and the IRS said it would extend the tax filing deadline to April 18th as a result of the outage.

That said, the agency expects around 5 million people to file taxes on April 17th, the deadline for individual income tax returns to be submitted to the federal government this year. (April 15th, the standard Tax Day, fell on a Sunday and April 16th was Emancipation Day, which is a holiday observed primarily in Washington, DC.)

You can still submit online using a credit or debit card, but that incurs a transaction fee. The good news: David J. Kautter, the IRS’s acting commissioner, told an oversight hearing today that the agency will not punish citizens whose returns arrive late due to the technical glitch. As part of the broader system failure, TurboTax owner Intuit is telling its customers to file returns with TurboTax as they would normally, with the company planning on holding onto them to submit alongside payments when the entire system is back online.

Later on Tuesday, Treasury Secretary Steve Mnuchin announced that the deadline to file personal income tax returns would be extended by one day because of the outrage. Mnuchin made the announcement at an event in Derry, New Hampshire, where he was speaking to a crowd about the Trump administration’s tax overhaul with Ivanka Trump, according to Bloomberg.

Update 4/17, 5:17PM ET: Added info about tax filing extension announcement from Treasury Secretary Steven Mnuchin. The headline has been updated to reflect this fact.