Twenty-seven post offices in Hawaii will have specially marked collection boxes to accept tax returns until midnight tonight. Today is the federal tax filing deadline.

Taxpayers were given more time this year because Emancipation Day, a holiday in the District of Columbia, was observed this year on April 15.

The 27 post offices listed below will have collection boxes and/or lobby drop slots labeled with special bright orange signs indicating Tax Mail Drop – Final Pick-Up Midnight. Tax forms with correct postage deposited in those specially designated boxes and slots by midnight will receive April 18 postmarks.

All Post Offices will close at their regular times. The Honolulu Airport Post Office will be the last to close, at 8 p.m., and will be the best bet for last-second customers who need stamps or special services. 

Here are the 27 post offices will special midnight collections:

Oahu — Airport, Downtown, Ewa Beach, Haleiwa, Hawaii Kai, Kailua, Kaneohe, Kapalama, Laie, Makiki, Mililani, Waialae-Kahala, Waianae, Waikiki, Waipahu.

Maui — Kahului, Kihei, Lahaina (Main), Makawao, Pukalani, Wailuku.

Hawaii Island — Hilo (Airport), Kailua-Kona, Kamuela.

Kauai — Lihue (Main).

Molokai — Kaunakakai.

Lanai — Lanai City.

The IRS expects the total number of individual tax returns, both electronic and paper, to total about 141 million this year, and for e-file returns to exceed last year’s record high of 100 million. As of April 1, 86 percent of all returns were filed electronically. According to the IRS, 20 to 25 percent of all taxpayers file in the final two weeks of the tax season.

Due to the declining numbers of citizens who submit hard-copy tax returns by mail, the Postal Service no longer provides curbside service to last-second filers of tax mail at its drive-by collection boxes.