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Engineering & Professional Services Firms: How to Calculate Your Payroll Costs (2026)
Managing payroll for engineering firms is more complex than most business owners realize before they hire someone to do it. Between prevailing wage for government projects, billable hour payroll allocation, and state compliance requirements that change annually, payroll demands consistent specialist attention.
The question is whether that attention should come from an in-house hire or an outsourced managed payroll provider. Here is the full cost comparison.
The True Cost of an In-House Payroll Hire for Engineering & Professional Services Firms
An in-house payroll coordinator for engineering firms earns $65,000-$95,000 in base salary. That is the number most owners compare against outsourcing. Here is the full picture when you add employment costs:
| In-House Cost Category | Annual Cost |
|---|---|
| Base salary (payroll/HR coordinator) | $65,000-$95,000 |
| Benefits (health, dental, 401K) ~30% | Add 30% |
| Payroll taxes (FICA, FUTA, SUTA) ~10% | Add 10% |
| Payroll software license | $1,800-$4,200 |
| Training and compliance updates | $1,200-$2,500 |
| Hiring and onboarding (amortized) | $2,000-$4,000 |
| Total loaded cost | See note below |
Total loaded annual cost typically runs $6500115K-$125K when benefits, employer taxes, software, training, and turnover cost are included. And when that person leaves, the cost resets.
BEG Managed Payroll at $25-$45 PEPM: What It Costs for Engineering & Professional Services Firms
| Engineering & Professional Services Firms Size | Monthly Cost | vs. In-House Hire |
|---|---|---|
| Small firm (5-20 engineers) | $125-$900/mo | Save $63K-$93K/yr |
| Mid-size firm (20-75 staff) | $500-$3,375/mo | Save $55K-$83K/yr |
| Regional firm (75-200 staff) | $1,875-$9,000/mo | Save $30K+/yr |
All-inclusive: payroll processing, tax filing, W-2 production, prevailing wage for government projects, billable hour payroll allocation, and year-round compliance monitoring.
What Engineering & Professional Services Firms Owners Miss in the Cost Calculation
Compliance exposure. Davis-Bacon for federally funded projects, Service Contract Act for service contracts, state PE licensing payroll records. A single filing error or misclassification can cost more to correct than months of managed payroll fees.
Key person dependency. When your in-house payroll coordinator leaves, you have a payroll gap. Recruiting and onboarding a replacement takes 4-8 weeks. An outsourced provider has no single point of failure.
Software and update costs. Payroll software licenses run $1,800-$4,200 per year, not including the time required to stay current on tax table updates, new hire reporting changes, and state-specific rule modifications.
When Should Engineering & Professional Services Firms Outsource Payroll?
For businesses under 100 employees, outsourcing almost always wins on total cost. At 25 employees paying $45 PEPM, monthly cost is $1,125 -- compared to a loaded in-house hire of $7,000-$9,000 per month. The math is clear at nearly any headcount below 100.
The strongest case for outsourcing: prevailing wage for government projects, billable hour payroll allocation, which require specialized knowledge most in-house generalists do not have.
Managed Payroll, Handled.
BEG manages payroll at $25-$45 per employee per month, all-inclusive. Get an instant cost comparison for your business.
Frequently Asked Questions
Can you handle prevailing wage for government engineering contracts?
Yes. For federally funded projects subject to Davis-Bacon, we produce certified payroll reports in WH-347 format and ensure each trade classification is paid at the required prevailing wage rate.
How do you handle payroll allocation across projects for billing purposes?
Project-coded payroll allocation is standard for engineering firms with cost-plus contracts. We set up project codes and produce payroll reports allocated by project to support billing calculations.
Can you handle payroll for field engineers who work in multiple states?
Yes. Field engineers working on projects in different states require withholding in both their resident state and sometimes the work state. We manage the allocation correctly for each employee.
What does BEG charge for engineering firm payroll?
Engineering firm payroll runs at $25-$45 per employee per month. Prevailing wage certified payroll, project code allocation, and multi-state filing are all included. For a 20-person firm, that is $500-$900 per month.
Related Resources
Anthony leads payroll solutions at Business Executive Group, a national managed payroll firm serving businesses across industries including Engineering & Professional Services Firms. BEG manages payroll at $25-$45 PEPM, all-inclusive, with deep expertise in compliance, multi-state filing, and industry-specific payroll requirements. Get instant pricing at beghr.com.
Authoritative source: U.S. Bureau of Labor Statistics: Occupational Employment and Wage Statistics
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