Major Tax Deadlines

For September 2015

September 15 Due date for individuals to pay third quarter installment of 2015 estimated tax.
September 15 Due date for filing 2014 tax returns for calendar-year corporations that had an extension of the March 16 filing deadline.
September 15 Due date for filing 2014 partnership tax returns that had an extension of the April 15 filing deadline.
October 1 Deadline for businesses to adopt a SIMPLE retirement plan for 2015.

NOTE: Businesses are required to make federal tax deposits on dates determined by various factors that differ from business to business.

Payroll tax deposits: Employers generally must deposit Form 941 payroll taxes (income tax withheld from employees’ pay and both the employer’s and employees’ share of social security taxes) on either a monthly or semiweekly deposit schedule. There are exceptions if you owe $100,000 or more on any day during a deposit period, if you owe $2,500 or less for the calendar quarter, or if your estimated annual liability is $1,000 or less.

  • Monthly depositors are required to deposit payroll taxes accumulated within a calendar month by the fifteenth of the following month.
  • Semiweekly depositors generally must deposit payroll taxes on Wednesdays or Fridays, depending on when wages are paid.

For more information on tax deadlines that apply to you or your business, contact our office.