Anytime

Employers – Income Tax Withholding. Ask employees whose withholding allowances will be different in 2019 to fill out a new Form W-4. The 2019 revision of Form W-4 will be available on the IRS website by mid-December.

November 13

Employees who work for tips – If you received $20 or more in tips during October, report them to your employer. You can use Form 4070.

Employers – Social Security, Medicare, and withheld income tax. File Form 941 for the third quarter of 2018. This due date applies only if you deposited the tax for the quarter in full and on time.

November 15

Employers – Nonpayroll withholding. If the monthly deposit rule applies, deposit the tax for payments in October.

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