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Corporations – Deposit the third installment of your estimated income tax. A worksheet, Form 1120-W, is available to help you make an estimate of your tax for the year.

Electing large partnerships – File Form 1065-B. This due date applies only if you were given an additional 6-month extension. See March 15 for the due date for furnishing the Schedules K-1 to the partners.

Employers – Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in August.

Employers – Social Security, Medicare, and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in August.

Individuals – Make a payment of your current year estimated tax if you are not paying your income tax for the year through withholding (or will not pay in enough tax that way). Use Form 1040-ES. This is the third installment date for estimated tax in the current year.

Partnerships – File Form 1065. This due date applies only if you were given an additional 6-month extension. Provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute K-1.

S Corporations – File 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.