InTandem Human Resources
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About InTandem Human Resources
InTandem HR is a Denver, Colorado-based IRS CPEO certified Professional Employer Organization founded in 2010 by Monica Denler, President and CEO. One of the first PEOs in the country to receive IRS CPEO certification, InTandem HR positions itself as the "HR team down the street" — a local, personalized alternative to large national PEOs. The company serves small and mid-sized businesses across all 50 states with payroll, employee benefits, HR administration, workers' compensation, and compliance. InTandem HR is particularly known for its community commitment: the company established the InTandem HR Foundation in 2017 to advocate for women, children, and healthcare organizations in the Denver community, and provides two paid volunteer days per year to all staff. The company also works with nonprofit clients at significantly reduced service fees.
IRS Certification
The IRS Certified PEO (CPEO) designation is awarded by the Internal Revenue Service to PEO companies that meet rigorous standards for financial health, tax compliance, and operational integrity. InTandem Human Resources holds CPEO status — a distinction held by fewer than 15% of PEOs in the United States.
Why businesses choose InTandem Human Resources
Company Details
InTandem Human Resources in Your State
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Pros & Cons
InTandem HR's community mission is genuine and well-documented — the Foundation, paid volunteer days, and nonprofit discounts reflect a real values-driven culture. For Colorado businesses that want a local, relationship-driven IRS-certified PEO with strong community ties, InTandem is the standout option. Best for: small and mid-sized businesses in Colorado and the Denver metro, particularly nonprofits and mission-driven organizations.