IRS Direct Pay, the Internal Revenue Service’s website that allows taxpayers to make payments, went down on Tax Day. The online payment system became unavailable about 2am central time yesterday, but the IRS did not provide an immediate explanation for the failure.  The IRS recommends that taxpayers use electronic filing to avoid common mistakes and online filing is quicker than using the mail – when the site works. But even if the online payment system is down you still have to pay your taxes. However, the tax filing deadline has been extended until midnight tonight because of the problems with the website.