Late tax filers on Thursday will be able get their income tax returns postmarked by the April 15 deadline, but they may have to go to the main post office on Forest Avenue or the Downtown Station on Congress Street.

Unlike in the past when some offices stayed open until midnight, the U.S. Postal Service says a shift to electronic filing by many taxpayers and scaled back lobby hours has forced the elimination of extended hours on April 15.

The retail windows at Portland’s main post office, at 125 Forest Ave., and at the Downtown Station post office, at 400 Congress St., will be open until 7 p.m. on Thursday.

The lobby at the main post office will  be open until 9 p.m. Tax returns that are dropped into the main collection slot in the lobby or into collection boxes outside the post office before midnight will get an April 15 postmark.

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