Tax Day 2018 has come and gone, and hopefully your tax return was safely transmitted to the IRS by the deadline. Unfortunately, not everyone is able to file their taxes on time. If you've missed the tax deadline for the 2017 tax year, it's important to understand what to do next to minimize potential penalties or complications. The steps you'll need to take to resolve issue with your un-filed tax return will vary depending on whether you're getting a refund or if you owe.