When to file income tax returns. Generally, a corporation must file its income tax return by the 15th day of the 3rd month after the end of its tax year. Example 1 - A corporation's tax year ends December 31. It must file its income tax return by March 15th. Example 2 - A corporation's tax year ends June 30. It must file its income tax return by September 15th. If the due date falls on a Saturday, Sunday, or legal holiday, the due date is extended to the next business day. Extensions of up to six months can be requested from the IRS.

When to pay estimated taxes. Installment payments are due by the 15th day of the 4th, 6th, 9th, and 12th months of the corporation's tax year. Example 1. - Your corporation's tax year ends December 31. Installment payments are due on April 15, June 15, September 15, and December 15. Example 2. - Your corporation's tax year ends June 30. Installment payments are due on October 15, December 15, March 15, and June 15. If any due date falls on a Saturday, Sunday, or legal holiday, the installment is due on the next business day.

How do I pay my corporate taxes? - Corporate taxes may be paid electronically by enrolling in the Electronic Federal Tax Payment System ( EFTPS ). To enroll in EFTPS, call one of the following phone numbers. 1-800-945-8400 or 1-800-555-4477 or online at www.eftps.gov.

What is the current mileage rate? The current mileage rates for mileage after January 1, 2008 are:

$.505 ( 50.5c ) per mile for business milage.

$.19 per mile for medial or moving purposes.

$.14 per mile for charitable purposes, other than those related to Katrina efforts.

What were the rates for laster year (2007) ?

$.485 ( 48.5c ) per mile for business milage.

$.20 per mile for medial or moving purposes.

$.14 per mile for charitable purposes, other than those related to Katrina efforts.