Online tax sites are straining to keep up with the crush of last-minute filers as tomorrow's April 17 deadline draws near.

Users logging onto TaxCut.com, operated by H&R Block, got a message saying that the site was experiencing a glitch: "If you experience this problem again, please wait a couple of days and we should have the problem corrected," the message read.

Despite reports of slow-downs, however, there have been no reports of any outages.

H&R Block and Intuit, the online tax site leaders, have been beefing up their sites this year to prepare for estimated 33.6 million people expected to file online this year.

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