Tax return due. Your 2009 income tax return is due, unless you file for an extension until Oct. 15.
File for extension. If you want an automatic extension of time to file your 2009 tax return, file Form 4868. Filing the form gives you until Oct. 15 to file your return. To avoid a penalty, however, be sure to pay any tax that is due on April 15.
Individual Retirement Accounts or Roth IRAs. This is the deadline for making contributions to IRAs or Roth IRAs for tax year 2009.
Estimated tax payment. Your first-quarter estimated tax payment for 2010 is due.
State tax returns. If you are required to file a state tax return, it is probably due, but check with your state to be certain. Many states automatically extend the filing time for those who have filed for a federal extension.
Household employers. If you paid cash wages of $1,700 or more in 2009 to a household employee, file Schedule H (Form 1040) with your income tax return and report any employment taxes by April 15.