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Tax Deadlines for Individuals
- Final deadline to file 2018 individual tax returns (with extension) - (Form 1040).
- Last day the IRS will accept an electronically filed tax return for the year 2018. If filing after October 15, you'll need to mail in your tax return for processing.
- Final deadline for calendar-year Benefit Plans (with an extension) to file Form 5500.
- 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.