The IRS has published updated tax calendars for payroll professionals, and versions are now available in English or Spanish. The online calendar is accessible from a computer, smartphone, or tablet. You can filter due dates by monthly depositor, semiweekly depositor, excise, or general event types to see applicable dates for each month.
You can also have reminders sent to your email inbox one or two weeks before a payment is due.
Also, subscribe to the IRS Calendar Connector if you have Outlook 2010, Outlook 2007, or Mac iCal. Have Outlook 2003? You can download tax dates. Or, feel free to use an iPhone or iPad with these programs.
Go here for more information.