All due dates assume that the date falls on a business day. If the due date falls on a holiday or weekend, the due date will be the next business day.

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August 2018

Employers

August 15

Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in July.

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Employers

August 15

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

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September 2018

Employees Who Work for Tips

September 10

If you received $20 or more in tips during August, report them to your employer. You can use Form 4070…

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Individuals

September 17

Make a payment of your current year estimated tax if you are not paying your income tax for the year…

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Partnerships

September 17

File Form 1065. This due date applies only if you were given an additional 6-month extension. Provide each partner with…

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Electing Large Partnerships

September 17

File Form 1065-B. This due date applies only if you were given an additional 6-month extension. See March 15 for…

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S Corporations

September 17

File Form 1120S and pay any tax due. This due date applies only if you timely requested an automatic 6-month…

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Corporations

September 17

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

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Employers

September 17

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

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Employers

September 17

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

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October 2018

Trusts and Estates

October 1

File Form 1041. This due date applies only if you were given an additional 5-month extension. Otherwise, see April 17.

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Employees Who Work for Tips

October 10

If you received $20 or more in tips during September, report them to your employer. You can use Form 4070…

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Individuals

October 15

If you have an automatic 6-month extension to file your income tax return, file Form 1040, 1040A, 1040EZ, FBAR Form…

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Corporations

October 15

File Form 1120 or 1120-A and pay any tax due. This due date applies only if you timely requested an…

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Employers

October 15

Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in September.

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Employers

October 15

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

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Employers

October 31

Social Security, Medicare, and withheld income tax. File form 941 for the third quarter of the current year. Deposit any…

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Employers

October 31

Federal Unemployment Tax. Deposit the tax owed through September if more than $500.

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Employers

October 31

Income Tax Withholding. Ask employees whose withholding allowances will be different in the next calendar year to fill out a…

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November 2018

Employers

November 13

This due date applies only if you deposited the tax for the quarter in full and on time.

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