Last day to make contribution to traditional IRA, Roth IRA, or SEP-IRA for 2005 tax year.

1st quarter estimated tax payments due for 2006 tax year.

Final deadline to file an original tax return (Form 1040) for tax year 2002 and still claim a tax refund. (Tip: follow my easy step-by-step approach to filing back taxes.)

Final deadline to file amended tax return (Form 1040X) for tax year 2002 and still claim a tax refund. (Tip: mail the amended return well before April 17th to make sure your tax refund will be processed in a timely manner.)

Deadline to file estate or trust tax returns (Form 1041) or to request an automatic 6-month extension of time to file (Form 7004).

Deadline to file partnership tax returns (Form 1065) or to request an automatic 6-month extension of time to file (Form 7004).

Final deadline for estates, trusts, or partnerships to file an amended tax return and still claim a tax refund for the year 2002.