Colorado prohibits employers from paying an employee less than an employee of a different sex for substantially similar work, regardless of job title, based on a composite of skill, effort and responsibility. The law also reaches sex in combination with another protected status. A pay difference may rely on seniority, merit, quantity or quality of production, geographic location, education, training or experience reasonably related to the work, or regular and necessary travel. Colorado guidance states that the employer must apply the factor reasonably, the factor must account for the entire pay gap, and prior wage history cannot be relied on to justify the difference. Colorado also separately prohibits seeking or using prospective employees' prior pay in covered circumstances.
Jurisdiction: Colorado
Colorado Uses Substantially Similar Work, Regardless of Job Title
Colorado's Equal Pay for Equal Work Act prohibits unequal pay between employees of different sexes who perform substantially similar work. The comparison is based on a composite of skill, effort and responsibility rather than the title printed on an organization chart. Colorado Department of Labor and Employment guidance emphasizes that the state standard is broader in wording than the federal Equal Pay Act. Employers should therefore examine actual job content, including responsibility, required skill and effort, rather than assuming different titles end the analysis.
The Act Covers Sex and Sex Combined With Another Protected Status
Colorado defines sex for this statute as gender identity and prohibits unequal pay based on sex or sex in combination with another protected status referenced in Colorado anti-discrimination law. Official complaint materials give examples such as unequal pay associated with sex together with race, disability or religion. Employers should therefore avoid limiting a Colorado pay-equity review to a simple binary sex comparison when intersectional differences may also be relevant under the statute.
Colorado Recognizes Six Categories of Permitted Factors
A differential can be based on a seniority system, merit system, a system measuring earnings by quantity or quality of production, the geographic location where the work occurs, education, training or experience to the extent reasonably related to the work, or travel that is regular and necessary for the work. These categories should be treated as specific compensation rules rather than general labels. The employer should be able to show what system or factor was used and how it affected the employee's wage rate.
The Factor Must Be Reasonably Applied and Explain the Entire Gap
Colorado's official Part 1 guidance states that a lawful differential requires more than identifying an allowed factor. The factor or system must be applied reasonably, it must account for the entire pay gap, and prior wage history must not be relied on to justify the unequal pay. This makes documentation particularly important. If geography explains only part of a difference, for example, the employer should identify and support the lawful reason for the remainder rather than assuming one valid factor protects the whole differential.
Colorado Separately Prohibits Reliance on Prior Pay
The Act restricts employers from seeking to learn a prospective employee's prior pay rates and from setting pay based on that history. Colorado guidance describes the restriction as covering application materials, interviews and employer research such as contacting a prior employer for pay information. Employers should use approved salary ranges and job-related placement criteria instead. The salary-history prohibition also means prior pay cannot be used as the missing explanation for an otherwise unsupported unequal-pay gap.
Colorado Pay Decisions Need Reconstructable Evidence
A useful compliance record connects each employee to the job content being compared, the applicable pay range and the exact factor affecting pay. Employers should retain evidence of seniority rules, merit criteria, production measures, location differentials, relevant education or experience and travel requirements where those factors are used. Colorado guidance also explains that unequal-pay complaints generally must be filed within two years, while an unequal-pay violation occurs with each payment at the unequal rate. Regular review therefore matters more than waiting for a complaint to expose an unexplained difference.
Frequently Asked Questions
Does Colorado require identical jobs for an equal-pay comparison?
No. Colorado uses substantially similar work based on a composite of skill, effort and responsibility, regardless of job title.
Can experience justify a Colorado pay difference?
Potentially, when education, training or experience is reasonably related to the work and the statutory conditions for the differential are satisfied.
Can prior salary justify a Colorado pay gap?
No. Colorado guidance states that prior wage history cannot be relied on to justify unequal pay, and the Act separately restricts seeking or using prospective employees' pay history.
Related Guides
Official Sources
Requirements and practices differ by jurisdiction and organisation. Check current local law, official guidance and professional advice for a specific situation.