MIAMI (CBSMiami) – Time is running out for South Floridians scrambling to put the finishing touches on their federal tax returns ahead of Monday’s midnight filing deadline.

If you can’t file in time, be sure to file a form 4868 for a six month extension, but it’ll only give you more time to file, not to pay. If you decide not e-file and go the old fashioned way, be aware that South Florida post offices will not be open until midnight like they used to be.

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Unlike in previous years, post offices won’t be open until midnight to handle last minute form filers.

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Employees at the Miami Processing and Distribution Center, 2200 NW 72 Avenue, will collect income tax returns in the parking lot until 9:30 pm only.

Click Here to see how late your local post office will to open on Monday.

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This year the Internal Revenue Service estimates the average tax refund will be $2,800.