December Tax Due Dates
December 17
Corporations
- Deposit the fourth installment of estimated income tax for 2018. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.
Employers
- Social Security, Medicare, and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in November.
Employers
- Nonpayroll withholding. If the monthly deposit rule applies, deposit the tax for payments in November.