Denver's Occupational Privilege Tax - the "head tax" - is owed for every month work is done in Denver. A dancer, creator or performer working for herself owes the business share, $4 a month, as the owner, with no earnings minimum. Anyone she pays $500 or more in a month for work in Denver - an assistant, a stylist, a booker on payroll - brings $5.75 withheld from their pay and $4 more from her. If a club or studio pays you as an employee, $500 or more in a month, it withholds your $5.75 - that is the club's return, not yours. Every figure is editable for when Denver changes them.
Log each month once it is over: whether you worked in Denver, and how many people you paid $500 or more for Denver work. A return covers the period Denver assigned you - a month, a quarter or a year - and is due the last day of the month after the period ends.