The Illinois Department of Revenue will accept electronically transmitted IL-1040 returns until midnight on August 15, 2001. If you can't meet the tax filing deadline, you can send Form 4868 to the Internal Revenue Service and get an automatic four-month extension of time to file your federal tax return. Along with the form, you should send the amount of tax you estimate you owe. If you can't pay the full amount, you should still send in the tax form and pay as much as you can. Remember the failure to file penalty is 10 times greater than the penalty for paying late.
Interest is charged on any taxes paid after the due date.
The Internal Revenue Service reminds you that now is a good time to check your withholding. If your tax refund was smaller, or larger, than you expected this year, complete a new Form W-4, Employee's Withholding Allowance Certificate, and give it to your employer.