Mailing your taxes in just before midnight: That's so 2002. Tim Boyle/Getty Images hide caption toggle caption Tim Boyle/Getty Images The Two-Way Think You Can Mail Your Taxes At Midnight? Think Again, Gramps April 15, 2014 Back in the day — say, up until about a decade or so ago — the big news on April 15 was always about last-minute filers lining up at post offices as the clock ticked down. Now? It's a different story.