Frequently Asked Questions Q.   How do I get my Tax Organizer on the Web? A.    Email, fax or call us and we will send it out immediately. Q.   When are Payroll Taxes Due? A.  Payroll Taxes are due with the Quartlery Payroll Returns on April 30th, July 31st, October 31st, and January 31st. However certain larger payrolls will require a monthly or weekly deposit. Please talk to your bookkeeper about the due dates of your payroll taxes. Q.  Why is my May Sales Tax Prepayment so high? A.  The May Sales Tax Prepayment covers the period of May 1st to June 15th, so you are paying for one and a half months at that time.