To make it clear: taxes are calculated and paid for the previous year. According to the Internal Revenue Service (IRS), the 2018 tax due date falls on April 15, 2019. However, although this is true for most taxpayers, some states have exceptions: taxpayers from Maine or Massachusetts have until April 17, 2019, to file their returns. The first step in filing your taxes is to figure out whether or not you need to file at all. The three main factors that determine the need to file are your age, marital status, and yearly income. File Form 9465 (Installment Agreement Request) or Form 9465 (SP) if you can't pay your tax bill to the IRS. An installment agreement is an option 120 days to collect the required funds to pay your tax bill. Depending on the amount you owe, you may or may not be required to undergo an interview with an IRS official. Individuals owning $50,000 or less in income tax can apply for an installment agreement online.