If you received $20 or more in tips during April, report them to your employer
If you are self-employed or have other first-quarter income that requires you to pay quarterly estimated taxes, get your Form 1040-ES postmarked by April 17, 2018 tax deadline.
If you haven't already funded your retirement account for 2017, do so by April 17, 2018. That's the deadline for a contribution to a traditional IRA, deductible or not, and a Roth IRA. However, if you have a Keogh or SEP and you get a filing extension to October 15, 2018, you can wait until then to put 2017 money into those accounts.
Need more time to prepare your tax return? File your request for a tax extension by April 17 to push your tax deadline back to October 15, 2018.
If you haven't applied for an extension, e-file or postmark your individual tax returns by midnight April 18, 2018.