February 10 - Non-Payroll Taxes File Form 945 to report income tax withheld for 2011 on all non-payroll items. This due date applies only if you deposited the tax for the year in full and on time. February 10 - Social Security, Medicare and Withheld Income Tax File Form 941 for the fourth quarter of 2011. This due date applies only if you deposited the tax for the … [Read more...] about February 2012 Business Due Date Reminders