So, April 15th has come and gone, and your taxes have not been filed. Don't panic. You're behind, but here are some essential tips that will guide you down the road to late filing.

An extension filed after midnight April 15th will be denied. If you missed the deadline you are still required to file a tax return as soon as possible. The failure-to-file penalty is 5 percent of the balance due (per month), up to a maximum of 25 percent. If the tax return is more than 60 days late, the minimum penalty is $135 or the balance due, whichever is less. In the event that you owe money, the IRS will impose fines, interest on money owed and penalties.

When filing a late return it's important to get the following forms: