Construction Payroll & Job Costing: Why Most Payroll Companies Can't Handle It

If you run a construction company, you already know the truth: most payroll companies weren't built for you.

They can process a standard biweekly paycheck just fine. But ask them to allocate labor costs across three projects, track prevailing wage rates by trade classification, generate certified payroll reports for a government job, and handle workers' comp codes for five different crews — and they fall apart.

After 10 years of processing payroll for contractors across Georgia, Florida, and Indiana, we've seen what happens when construction companies outgrow their payroll provider. Here's what you actually need — and what most providers are missing.

The 4 Things Construction Payroll Must Do That Regular Payroll Can't

1. Job Costing: Know Exactly What Every Project Costs

In a standard business, payroll is a line item. In construction, payroll is a per-project variable that determines whether you make money or lose it.

Job costing means every labor dollar gets tracked to:

• Which project (Project code or job number)
• Which phase (Framing, electrical, finishing)
• Which cost code (Labor, materials, equipment)
• Which employee classification (Journeyman, apprentice, foreman)

Without real job costing, you're guessing at project profitability. You might know your total payroll was $200,000 last month — but not that Project A consumed $120,000 of labor while Project B only used $80,000. If Project A was bid at $100,000 in labor, you just lost $20,000 and might not know it until the job is done.

2. Certified Payroll: The Government Job Requirement

If your company works on any federally funded project over $2,000, you're required to submit certified payroll reports under the Davis-Bacon Act. This includes:

• Weekly Form WH-347 submissions for every active project
• Employee names, classifications, hours, and pay rates
• Fringe benefit breakdowns
• A signed Statement of Compliance
• Records maintained for at least 3 years for audit

The penalty for getting this wrong isn't a slap on the wrist. It's withheld payments, contract penalties, and potential debarment from future government work. Many payroll companies simply can't generate a proper WH-347 — they weren't designed for it.

3. Prevailing Wage Management: Different Rates for Every Job

On government and public works projects, you can't just pay your standard rate. You must pay the prevailing wage — the rate set by the Department of Labor for each trade classification in each geographic area.

This means:

• A carpenter in Atlanta might have a different prevailing wage than a carpenter in Savannah
• A single employee might earn $28/hour on a private job and $42/hour on a government job — in the same week
• Fringe benefits must be calculated separately and can be paid as cash or through bona fide benefit plans
• As of 2026, the DOL uses a three-step calculation method that can result in higher prevailing rates

Your payroll system needs to handle multiple pay rates per employee, per project, per pay period. Most can't.

4. Workers' Compensation by Classification

Construction workers' comp isn't one rate. It varies dramatically by classification code:

Good news for Florida contractors: workers' comp premiums dropped 6.9% for 2026 — the ninth consecutive year of decreases. But you still need your payroll system to assign the correct class code to each employee and track it per project.

What Your Payroll System Should Actually Do

Here's the checklist. If your current provider can't check every box, you need a change:

How Job Costing Saves (or Loses) You Money

Let's look at a real scenario. A general contractor in Canton, GA runs two projects simultaneously:

The same carpenter might work 20 hours at $42/hour on the school job and 20 hours at $28/hour on the office build-out — in the same week. A generic payroll system can't split that. iSolved can.

Construction + OBBBA: Don't Miss the Overtime Deduction

The One Big Beautiful Bill Act's overtime tax deduction is especially relevant for construction. Many field workers regularly earn overtime, and the new deduction allows employees to exclude up to $12,500 of FLSA overtime premium from federal income tax.

For construction employers, this means:

• Your W-2s need Box 12 Code TT for qualified overtime
• Only FLSA-required overtime qualifies (not voluntary OT or premium pay)
• Employees working prevailing wage jobs with built-in OT must track FLSA OT separately
• iSolved handles this tracking and reporting automatically

Read our complete OBBBA overtime guide.

How to Reach Construction Companies (A Marketing Note)

If you're a construction company reading this, you found us because you searched for a solution to a real problem. That's exactly how we think about marketing at BlueWave HR — we create educational content that helps contractors solve compliance challenges, then make it easy to get help when you're ready.

FAQ

What is job costing in construction payroll?

Job costing tracks every labor dollar to a specific project, phase, and cost code. It tells you exactly how much labor each project consumed, whether you're over or under budget, and what your true labor burden is (40-70% above base wages when you include taxes, insurance, benefits, and PTO).

What is certified payroll and when is it required?

Certified payroll is a weekly payroll report (Form WH-347) required by the Davis-Bacon Act on federally funded construction projects over $2,000. It documents that every worker is paid the prevailing wage. Reports must include employee details, hours, classifications, rates, deductions, and a signed Statement of Compliance. Records must be maintained for at least 3 years.

What are prevailing wages in construction?

Prevailing wages are the minimum hourly rates (including fringe benefits) required on public construction projects. They're set by the U.S. Department of Labor by trade and location. As of 2026, the DOL uses a three-step calculation method, and 32 states have additional state-level prevailing wage laws.

Can iSolved handle construction payroll and job costing?

Yes. iSolved People Cloud handles job costing by project, multiple pay rates per employee, certified payroll reports, prevailing wage tables, fringe benefit calculations, geofenced time tracking, and workers' comp by classification. BlueWave HR configures all of this for construction clients.