As of midnight Tuesday morning, tax season is over — unless you are one of the about 14.6 million Americans expected to file an extension request with the Internal Revenue Service.

The IRS expects about 153 million individual tax returns for the 2018 tax year to be filed this year, with millions of taxpayers waiting until the last minute — 18.3 million are expected to file this week.

For most of the country, the deadline is Monday, though in Massachusetts and Maine, the deadline is Wednesday.

The days of long lines at the post office seem to be a thing of the past, as the IRS expects the majority of last-minute filings to be electronic. The line at Marietta’s post office on Lawrence Street was moving quickly Monday around lunch time, with about an even mix of taxpayers looking to file and others sending packages or buying stamps.

In years past, post offices would stay open until midnight on Tax Day, but this year, the closest one to do so is way down in the southernmost part of Atlanta at 3900 Crown Road.