Time to take your head out of the sand, procrastinators – April 15 is just over a week away, and if you haven't begun preparing your 2013 tax returns yet, it's time to get cracking. It takes an estimated 16 hours to fill out a 1040, according to the IRS, though most taxpayers spend less time than that.

More than half of taxpayers had already filed returns by mid-March, but millions still had not sent in their returns. If you're in the latter group, here are seven tips to make the most of the very limited time you have left.