Though the biggest tax deadline for most people is April 15th, other important tax deadlines come up throughout the rest of the tax year. Here are a few important tax calendars for 2012 from IRS.gov.

General Tax Calendar 2012

This tax calendar has the due dates for 2012 that most taxpayers will need. Employers and persons who pay excise taxes also should use the Employer’s Tax Calendar and the Excise Tax Calendar.

Fiscal-Year Taxpayers Calendar

If you use a fiscal year (rather than the calendar year) as your tax year, you should change some of the dates in the General Tax Calendar. Use the following general guidelines to make these changes.

TIP:  The 3 months that make up each quarter of a fiscal year may be different from those of each calendar quarter, depending on when the fiscal year begins.

Employer's Tax Calendar 2012

This tax calendar covers various due dates of interest to employers. Principally, it covers the following federal taxes.

• Income tax you withhold from your employees’ wages or from nonpayroll amounts you pay out.
• Social security and Medicare taxes (FICA taxes) you withhold from your employees’ wages and the social security and Medicare taxes you must pay as an employer.
• Federal unemployment (FUTA) tax you must pay as an employer.

The calendar lists due dates for filing returns and for making deposits of these three taxes throughout the year. Use this calendar with Publication 15 (Circular E), which gives the deposit rules.