- December 11 — Employees who work for tips
If you received $20 or more in tips during November, report them to your employer Details
- December 15 — Corporations
Deposit the fourth installment of estimated income tax for 2018 Details
- December 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in November.
- December 25 — Everyone
Federal Holiday (Christmas Day) Details