August 10 – Employees who work for tips.  If you received $20 or more in tips during July, report them to your employer.  You can use Form 4070.

August 16 – Individuals.  If you have an automatic 4-month extension to file your income tax return for 2003, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.  If you need an additional 2-month extension, file Form 2688.

Note.  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.

Individuals.  Form 1040.  This form is due on the 15th day of the 4th month after the end of your tax year.

Estimated tax payments (Form 1040–ES).  Payments are due on the 15th day of the 4th, 6th, and 9th months of your tax year and on the 15th day of the 1st month after your tax year ends.