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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October 2018

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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Employees Who Work for Tips

November 13

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

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Employers

November 15

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

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Employers

November 15

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

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Exempt Organizations

November 15

File Form 990. This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see May 15.

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December 2018

Employees Who Work for Tips

December 10

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

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Corporations

December 17

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

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Employers

December 17

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

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Employers

December 17

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

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