File a 2018 calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder's Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.
S corporation election. File Form 2553, Election by a Small Business Corporation, to elect to be treated as an S corporation beginning with calendar year 2019. If Form 2553 is filed late, S treatment will begin with calendar year 2020.
File a 2018 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see March 15. Provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1.
If you operate on a fiscal year, see tax calendar information for Fiscal-Year Taxpayers.
July 4 — Everyone
Federal Holiday (Independence Day) Details
July 10 — Employees who work for tips
If you received $20 or more in tips during June, report them to your employer Details
July 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in June.
July 31 — Social security, Medicare, and withheld income tax
File Form 941 for the second quarter of 2018. Deposit or pay any undeposited tax under the accuracy of deposit rules.