What does fit supp mean on check stub?

"Fit supp" on a check stub typically refers to "fit supplemental," which indicates additional pay or benefits that are provided to an employee, often related to overtime, bonuses, or other supplemental earnings. It may also pertain to deductions or contributions related to benefits such as health insurance or retirement plans. Employees should review their check stub for details to understand how these amounts are calculated and their impact on overall pay.