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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December 2018

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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