August 10 – Social Security, Medicare and Withheld Income Tax
File Form 941 for the second quarter of 2018. This due date applies only if you deposited the tax for the quarter in full and on time.
August 15 – Social Security, Medicare and Withheld Income Tax
If the monthly deposit rule applies, deposit the tax for payments in July.
August 15 – Non-Payroll Withholding
If the monthly deposit rule applies, deposit the tax for payments in July.