Haven't filed your taxes yet? Here's how to get an extension from the IRS.

If you're one of the millions of Americans who have procrastinated filing their taxes ahead of the April 15 deadline, there is a way to get some breathing room: File for an extension. 

The step gives taxpayers until October 15 to file their federal tax returns, and the process is fairly quick — and also free. About 90 million people have filed their 1040s with the IRS as of March 29, the tax agency says. But as it expects about 128.7 million tax returns this year, that means almost 40 million people have pushed off filing until the last two weeks of the regular tax season.

Almost half of Americans delay working on their taxes, a new survey from tax prep company TaxAct found. Many are stressed by the task, but more than 1 in 4 is worried about owing money to the IRS, the study found.