June 15 – Employer’s Monthly Deposit Due
If you are an employer and the monthly deposit rules apply, June 15 is the due date for you to make your deposit of Social Security, Medicare and withheld income tax for May 2018. This is also the due date for the non-payroll withholding deposit for May 2018 if the monthly deposit rule applies.
June 15 – Corporations
Deposit the second installment of estimated income tax for 2018 for calendar year corporations.