Using a laborer rate for work that requires a journeyman classification creates back wage liability for every hour that worker was on site. Here are the five most common classification mistakes — and the system that prevents them.
Prevailing wage work is classified by the type of work performed — not by the worker's trade or regular pay rate. An electrician doing concrete formwork on a prevailing wage job is classified as a laborer or carpenter for that work — not as an electrician. If the electrician rate is higher than the laborer rate, classifying them as an electrician for that work overpays. If the laborer rate is higher than the electrician rate, it underpays and creates liability. Classification follows the work, not the worker's primary trade.
Prevailing wage rates include base wages plus fringe benefits — health and welfare, pension, and apprenticeship training fund contributions. Paying the correct base wage but underpaying the fringe creates back wage liability equal to the fringe underpayment for every hour worked on the project. Most fringe benefit underpayments result from using a fringe rate from an older wage determination or from a different project location.
Prevailing wage work has a higher labor burden — fringe benefits add $12–$22/hour on top of base wages that do not apply to private work. A contractor using a blended overhead rate underprices prevailing wage work by the fringe difference on every public bid. Two overhead rates — one for each work type — are needed for accurate bid pricing on both.
Each worker's classification on a prevailing wage project is determined by the work they are actually performing each day — not their regular trade classification. A journeyman electrician who spends two hours on electrical work and four hours on general labor has two separate classification entries in the certified payroll for that day. The wage determination specifies the rate for each classification. The payroll must reflect actual work performed.
Prevailing wage rates update periodically. Federal Davis-Bacon rates are published on SAM.gov. State prevailing wages are published by the applicable state agency. Using a rate that was current 18 months ago and has since increased means the labor cost in the bid is wrong. Pull the current determination from the bid documents before every prevailing wage bid.
SPM builds prevailing wage project cost codes in ControlQore by worker classification — journeyman, apprentice by year, laborer, operator, foreman. When a worker's time is entered for a prevailing wage project, they select the classification that matches the work performed that day. The certified payroll report is generated from the classification time entry data — not manually assembled from payroll timesheets.
Certified payroll submissions are prepared and filed separately from regular payroll processing. SPM produces the certified payroll report from ControlQore data weekly for each prevailing wage project. The report is reviewed for classification accuracy before submission. Corrections are made before filing — not after a compliance audit identifies them.
This contractor did 35% of revenue on DOT prevailing wage work. A single blended overhead rate was used in all bids and certified payroll was assembled manually from timesheets. Two classification errors were identified in a pre-audit review — one that had been running for 4 months.
Before any compliance audit — back wage liability eliminated before it became a formal claim.
In 60 days after SPM corrected the billing structure including the separate prevailing wage overhead rate on new bids.
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