Final extended deadline to file individual tax returns for the year 2018 (Form 1040) Last day the IRS will accept an electronically filed tax return for the year 2018. If you're filing after this date, you'll have to mail in your tax return for processing. Final deadline to fund a SEP-IRA or solo 401(k) for tax year 2018 if you requested an automatic extension of time to file ...

Deadline for self-employed persons or small employers to establish a SIMPLE-IRA ...

Third-quarter estimated tax payments due for the 2019 tax year Final deadline to file corporate tax returns for the year 2018 if an extension was requested. (Forms 1120, 1120A, 1120S) ...

Deadline for U.S. citizens living abroad to file individual tax returns or file Form 4868 for an automatic 4-month extension ...

Second-quarter estimated tax payments due for the 2018 tax year ...