The dreaded tax filing deadline is here, and despite an extra two days, thousands of Southwest Florida taxpayers are scrambling to finish up.

An estimated 10 million Floridians are expected to file individual federal income tax returns for 2017, and the procrastinators are again in last-minute mode.

April 15 is the traditional final day to file. But the 15th fell on Sunday, and the following Monday was Emancipation Day, a legal holiday in the District of Columbia, so the deadline moved to Tuesday.

The Internal Revenue Service says this is the busiest time of tax season. Nearly 40 million taxpayers had yet to file their returns by the end of last week. Last year, 5 million taxpayers filed returns on the deadline day.

In Florida, more than 1.1 million taxpayers will file for the automatic six-month extension, giving them until Oct. 15 to submit their returns. Many of them will come in the final hours before the midnight deadline, the IRS said.

As of April 6, the IRS had received 103.7 million individual tax returns, just slightly ahead of last year. More than 79.1 million refunds have been issued, averaging $2,864, or $13 more than last year.

With most taxpayers opting to file electronically — over 92 percent so far this year — Southwest Florida post offices no longer stay open late for the once-traditional dash for the pre-midnight postmark.

Sarasota post offices will be open until 5:30 p.m. Tuesday, according to the U.S. Postal Service. The office in Port Charlotte will be open until 6 p.m. If dropping off in a collection box, make sure to check the pick-up schedule.

Some tax preparers and services may be available for last-minute help Tuesday. The AARP Tax-Aide, for example, will offer free assistance from 9:30 a.m. to 1 p.m. at the Senior Friendship Center, at 1888 Brother Geenen Way in Sarasota, and from 2 p.m. to 6 p.m. at Sarasota's Selby Library, 1331 First St.