March 16, 2010
Deadline for corporate tax returns (Forms 1120, 1120A, and 1120S), or to request automatic 6-month extension of time to file (Form 7004).
Final deadline to file an amended corporate tax return (Form 1120X) for tax year 2006 and still claim a tax refund.
April 15, 2010
Deadline to file individual tax returns (Form 1040, 1040A, or 1040EZ) or to request an Automatic Extension (Form 4868). An extension provides an extra six months to file your return. Payment of the tax is still due by April 15th. You can submit payment for tax along with the extension form.
Last day to make contribution to traditional IRA, Roth IRA, or SEP-IRA for the 2009 tax year. (However, if you get an extension, you will have until October 15th to fund a SEP-IRA.)
1st quarter estimated tax payments due for 2010 tax year.
Final deadline to file an original tax return (Form 1040) for tax year 2006 and still claim a tax refund. (I provide an easy, step-by-step approach to filing back taxes.)
Final deadline to file amended tax return (Form 1040X) for tax year 2006 and still claim a tax refund. (Be sure to mail the amended return well before April 15th to make sure your tax refund will be processed in a timely manner. And be sure to obtain proof of mailing, such as a certified mail receipt.)
Deadline to file estate or trust tax returns (Form 1041) or to request an automatic 5-month extension of time to file (Form 7004).
Deadline to file partnership tax returns (Form 1065) or to request an automatic 5-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 2006.
May 15, 2010
Deadline for non-profit organizations to file information returns (Form 990), or request an extension (Form 8868).
June 15, 2010
2nd quarter estimated tax payments due for 2010 tax year.
Deadline for US citizens living abroad to file individual tax returns and to pay any tax due. You can request an additional 4-month extension (Form 4868). (Tip: request an automatic extension by April 15th instead.) I provide useful information for claiming the Foreign Earned Income Exclusion and the Foreign Tax Credit, two tax breaks essential for Americans working abroad.
June 30, 2010
Deadline to file TD F 90-22.1 Report of Foreign Bank Accounts for the year 2009. This report is required if you have over $10,000 (in aggregate) held in foreign bank accounts.
September 15, 2010
3rd quarter estimated tax payments due for 2010 tax year.
Final deadline to file corporate tax returns if an extension was requested. (Forms 1120, 1120A, 1120S).
Final deadline to file trust tax returns (Form 1041) if an extension was requested.
Final deadline to file partnership tax returns (Form 1065) if an extension was requested.
October 15, 2010
Final deadline to file individual tax returns (with extension).
Last day the IRS will accept an electronically filed tax return for 2009. If filing after October 15th, you’ll need to mail in your tax return for processing.
Final deadline to fund a SEP-IRA for tax year 2009 if you requested an automatic extension of time to file.
November 2010
Start planning any year-end tax moves.
December 1, 2010
If you are covered by an HSA-compatible health insurance policy as of December 1st, you’ll be eligible to contribute the full amount to a Health Savings Account for the year.
December 31, 2010
Last day to make any tax moves for the year 2010.
Marital status on this date determines your marital status for the whole year.
Source: Tax Calendars for 2010 (IRS Publication 509)