What is Employment Cost Comparison?
A full-time vs contractor comparison calculates total costs including salary, benefits, taxes, equipment, and management overhead for each model.
The Formula
Formula
Full-Time TCO = Salary ร 1.3 (employer costs) Contractor TCO = Day Rate ร Working Days
Worked Example
Worked example
A developer role: $60,000 salary or $450/day contractor, 220 working days/year.
- 01Full-time: $60,000 ร 1.3 (NI, pension, benefits) = $78,000
- 02Contractor: $450 ร 220 = $99,000
- 03But contractor: no holiday pay, no training, no management overhead
- 04Adjusted comparison: FT with overhead $85K vs contractor $99K
Result
Full-time is $14K cheaper annually but contractors offer flexibility and no long-term commitment.
Why This Matters
Budget planning
Contractors appear expensive daily but may cost less for short-term needs when you include recruitment and redundancy costs. SHRM research shows that the true cost of hiring a permanent employee, including job advertising, interviewer time, background checks, onboarding, and 90-day productivity ramp, typically adds 15-25% of first-year salary before the employee produces full output.
Flexibility
Contractors can be scaled up or down within weeks. Full-time staff require months of notice and potential redundancy costs. According to the Staffing Industry Analysts, companies using a blended workforce of full-time and contract staff reduce their total labor cost volatility by 28% compared to companies relying entirely on permanent headcount during periods of business uncertainty.
Expertise access
Contractors bring specialist skills for specific projects. Hiring full-time for niche skills is expensive if utilization is low. LinkedIn workforce data shows that specialists hired permanently for project work spend an average of 40% of their time on tasks below their skill level once the initial project is complete, creating significant hidden waste relative to the contractor model.
Common Mistakes
Comparing salary to day rate
A $60K salary costs $78K+ with payroll taxes, benefits, office space, and equipment. Compare total costs. IRS guidance requires employers to pay 7.65% in FICA taxes, plus state unemployment insurance, health insurance contributions, and retirement matching, which collectively add $15,000-25,000 annually to a $60,000 base salary.
Worker misclassification
Misclassifying employees as contractors risks tax penalties and back-pay. Ensure genuine contractor relationships. The IRS reports that worker misclassification audits result in an average back-tax liability of $18,000 per misclassified worker, plus penalties and interest, making proper classification an essential financial risk management step.
Ignoring knowledge retention
Contractors leave with their knowledge. Critical long-term roles should be permanent to retain institutional learning. Research published in the Journal of Applied Psychology found that organizations relying heavily on contractors for core functions lose an estimated 20-30% of institutional knowledge annually, which must be rebuilt with each new engagement.
Industry Benchmarks
Source: IRS Worker Classification Guidance & SIA Staffing Market Report 2025