April 15 is the deadline for filing annual income taxes with the IRS.
The agency says 97 million American taxpayers had already submitted their tax forms by the first of April.
Those who still owe taxes this year, but are not ready to file, will need to pay at least 90 percent of the amount due when you apply for an extension.
See these articles for last-minute tax help:
RELATED LINK: 3 catches with IRS Free Filing website (http://bit.ly/XOIqhR)
RELATED LINK: Free help and information from the IRS (http://bit.ly/15e75kS)
RELATED LINK: 9 tips for tax season: Deductions you may not know about (http://bit.ly/ZqQDGH)
Filing today? The post office is open late to accommodate all the last-minute filers. Tulsa's airport station is open until midnight. Any returns dropped off there will be postmarked with Monday's date.
Eight other 24-hour locations are open around Tulsa.
RELATED LINK: Tax Day 2013: Coupons, freebies, discounts (http://bit.ly/15a4DM6)