Running payroll for a union workforce means paying each employee at the rate their collective bargaining agreement assigns to their job classification, withholding authorized union dues from the paycheck, and sending separate per-hour employer contributions to trust funds for health, pension, and apprenticeship benefits. So how does union payroll work in practice? It follows a fixed cycle: calculate gross wages from the CBA rate table, apply overtime and premium rules that are often stricter than federal law, deduct dues only where the worker has signed for them, then file remittance reports and payments with the union and its trust funds on the schedule the agreement sets.
Wages Come From the CBA, Not the Employer
In a non-union shop, the employer decides what to pay. In a union shop, the CBA does. The agreement assigns a specific hourly rate to each job classification and seniority tier. A first-year apprentice electrician earns one rate; a journeyman with a completed apprenticeship earns a higher one. Payroll cannot round up, hand out merit raises above scale, or cut individual deals. Everyone at the same classification and seniority gets the same number on the check.
Those classification tables also govern movement between pay tiers. Apprentices step up through defined levels tied to training hours and time on the job, and each step carries its own rate. Payroll has to track every worker’s current classification and change the rate on the exact date a promotion takes effect. Miss the date and the underpayment compounds every pay period until someone catches it.
Overtime and Premium Pay Under Union Contracts
The Fair Labor Standards Act requires overtime at one and a half times the regular rate for hours over 40 in a workweek. It does not require daily overtime.1eCFR. 29 CFR Part 778 – Overtime Compensation – Section 778.101 Most union CBAs go further. Many construction and industrial agreements trigger overtime after eight hours in a single day regardless of the weekly total. An employee who works four 10-hour days owes zero overtime under federal law but eight hours of overtime under a typical construction CBA. Payroll that runs the FLSA calculation alone will underpay.
Shift differentials and holiday premiums add more layers. Evening and overnight shifts commonly carry a flat per-hour bump, and holiday work often pays double or triple time. Those numbers come from the CBA, not from a default formula, so payroll has to pull each rate directly from the agreement. Under the FLSA, underpaying overtime exposes the employer to the unpaid wages plus an equal amount in liquidated damages.2Office of the Law Revision Counsel. 29 USC 216 – Penalties
Deducting Union Dues From Paychecks
After gross pay is calculated, dues come out. Dues structures vary by local. Some charge a flat monthly amount, others take a percentage of gross wages, and many combine both. A new member may also owe a one-time initiation fee, which payroll typically spreads across several pay periods.
An employer can only withhold dues if the employee has signed a written authorization. The Labor Management Relations Act makes it unlawful for an employer to pay money to a union unless the employee has provided a written assignment authorizing the deduction.3Office of the Law Revision Counsel. 29 USC 186 – Restrictions on Financial Transactions Without that form on file, the deduction is illegal even if the CBA requires union membership. The National Labor Relations Act separately permits union security clauses making dues a condition of employment, but only after the employee has been given at least 30 days from hire before the requirement takes effect.4Office of the Law Revision Counsel. 29 USC 158 – Unfair Labor Practices
Right-to-Work States, Beck Objectors, and Public-Sector Employees
Whether an employer can require dues at all depends on the state. Roughly 27 states have right-to-work laws that prohibit conditioning employment on union membership or dues payment. In those states, payroll may process dues for members who voluntarily authorize the deduction and process nothing at all for non-members doing the same job.
Even without a right-to-work law, non-members have protections. In Communications Workers of America v. Beck, the Supreme Court held that a union cannot spend a non-member’s dues on activities unrelated to collective bargaining, such as political campaigns or lobbying.5Justia U.S. Supreme Court Center. Communications Workers of America v Beck, 487 US 735 (1988) Non-members who object can have their payments reduced to cover only bargaining and contract administration. Payroll needs to flag Beck objectors so it withholds the reduced amount rather than full dues.
For public-sector employers, the rules changed in 2018. In Janus v. AFSCME, the Court held that extracting any fees from nonconsenting public-sector employees violates the First Amendment; no payment to the union may be deducted from a non-member’s wages without affirmative consent.6Supreme Court of the United States. Janus v State, County, and Municipal Employees Public-sector payroll cannot default new hires into dues deductions. The employee has to opt in.
Employer Contributions to Benefit Trust Funds
The hourly rate on the paycheck is only part of the labor cost. CBAs typically require the employer to contribute additional money for every hour worked into trust funds providing health insurance, pension benefits, and apprenticeship training. These per-hour contribution rates are set in the agreement and can add $15 to $30 or more on top of the base wage. Vacation and holiday hours usually count toward the contribution calculation, not just hours physically on the job.
These trust funds are managed by joint boards of trustees, not by the employer or the union alone. Federal law requires that the money be held for the sole and exclusive benefit of the employees and their families, with employers and employees equally represented in fund administration.3Office of the Law Revision Counsel. 29 USC 186 – Restrictions on Financial Transactions Once the employer sends money to the trust, it cannot get it back. The fund’s trustees have a fiduciary obligation to use the money only for promised benefits, and the assets are shielded from the employer’s creditors if the business goes under.
What Late Contributions Cost
Falling behind on trust fund contributions triggers consequences under the Employee Retirement Income Security Act. When a trust fund sues to collect delinquent contributions under 29 U.S.C. § 1132(g)(2), the court can award the unpaid amount plus interest, liquidated damages, and the fund’s attorney’s fees. Many trust agreements set liquidated damages at 10% to 20% of the delinquent amount, and courts routinely enforce those provisions.
Plan administrators who fail to file required annual reports with the Department of Labor face civil penalties of up to $1,000 per day, subject to periodic inflation adjustments.7Office of the Law Revision Counsel. 29 USC 1132 – Civil Enforcement> Anyone who knowingly makes a false statement in an ERISA-required document faces a fine and up to five years in prison, and that penalty runs against the individual who signs the document, not just the company.8Office of the Law Revision Counsel. 18 USC 1027 – False Statements and Concealment of Facts in Relation to Documents Required by the Employee Retirement Income Security Act of 1974
Filing Remittance Reports and Paying on Time
Each trust fund requires a remittance report listing every covered employee’s hours, earnings, and contribution amounts. Payroll compiles each worker’s name, identifying number, job classification, and hours broken down by category. Most funds want straight time, overtime, and paid leave hours reported separately because contribution rates sometimes differ by hour type. The employer’s tax identification number and the reporting period complete the standard data set.
Remittance forms come from the fund administrator, either as downloadable spreadsheet templates or through a web portal. Larger trust funds accept electronic file uploads in formats like CSV or Excel, and some use standardized financial data interchange formats through ACH networks for both payment and remittance detail. Smaller locals may still accept paper forms mailed with a check, though this is increasingly rare. When mailing, certified mail with return receipt creates proof of timely delivery.
Submission frequency is set by the CBA or the trust fund’s rules, with monthly reporting the most common cycle. Late payments almost always trigger automatic penalties. Trust fund agreements commonly impose liquidated damages and interest starting the day after the deadline, regardless of how small the delay, and trustees are generally required to enforce them uniformly rather than granting informal extensions. Paying on time is the cheapest compliance strategy by a wide margin.
Certified Payroll on Government Projects
Union contractors working on federal or federally funded construction face an additional layer under the Davis-Bacon Act. Any federal construction contract over $2,000 must include a provision requiring the contractor to pay at least the prevailing wage for each job classification in the area where the work is performed.9Office of the Law Revision Counsel. 40 USC 3142 – Rate of Wages for Laborers and Mechanics The prevailing wage is the sum of a basic hourly rate and a fringe benefit rate, both set by the Department of Labor in published wage determinations.
The employer can satisfy the fringe portion through direct contributions to union trust funds, cash payments to the worker, or a combination. Cash wages above the basic hourly rate can offset the fringe obligation. On a project where the wage determination lists a $27.00 basic hourly rate and $14.00 in fringe benefits, paying $35.00 in cash plus $6.00 in trust fund contributions meets the full $41.00 obligation because the $8.00 in excess cash covers the remaining fringe gap.10U.S. Department of Labor. Fact Sheet 66E – The Davis-Bacon and Related Acts – Compliance with Fringe Benefit Requirements
The Copeland Act requires every contractor and subcontractor on a covered project to submit a certified payroll report every week.11Office of the Law Revision Counsel. 40 USC 3145 – Regulations Governing Contractors and Subcontractors The standard form is DOL Form WH-347, though its use is optional as long as the required data is included. Each report must list every worker’s name, job classification, daily hours split into straight time and overtime, hourly rate, gross pay, and deductions. A signed Statement of Compliance certifying accuracy and prevailing-wage payment must accompany each weekly submission.12U.S. Department of Labor. Instructions for Completing Davis-Bacon and Related Acts Weekly Certified Payroll Form WH-347 False statements on certified payroll reports are subject to criminal penalties under 18 U.S.C. § 1001, including fines and up to five years in prison.
The Contract Work Hours and Safety Standards Act also sets overtime on federal projects at one and a half times the basic rate for all hours over 40 in a workweek.13Office of the Law Revision Counsel. 40 USC 3702 – Work Hours This applies even if the CBA’s overtime trigger is more generous, so payroll has to apply whichever rule produces the higher pay for the worker.
ACA Reporting When Health Coverage Runs Through the Trust
Employers with 50 or more full-time equivalent employees face Affordable Care Act reporting even when health coverage runs through a union trust fund rather than a company-sponsored plan. The employer still must file Form 1094-C with the IRS and distribute Form 1095-C to each full-time employee. An interim rule gives employers contributing to multiemployer plans a simplified method: enter code 1H on line 14 and code 2E on line 16 of Form 1095-C for each month the employer was required to contribute on the employee’s behalf.14Internal Revenue Service. 2025 Instructions for Forms 1094-C and 1095-C The approach removes the need for the employer to track whether a specific employee was eligible or enrolled, since the trust fund handles eligibility.
To use these codes, the employer’s contribution obligation must come from a CBA or participation agreement, and the multiemployer plan must offer coverage that is affordable, provides minimum value, and covers dependents to age 26. The IRS has indicated the reporting rules for multiemployer plans may change for 2026 and later, so check the current year’s instructions before filing.
Trust Fund Audits and Record-Keeping
Trust funds have the legal right to audit an employer’s payroll records to verify contributions. Auditors don’t limit their review to remittance reports already submitted. They compare those reports against the employer’s internal payroll records, general ledger, tax filings like quarterly Forms 941 and annual W-2s, and cash disbursement journals. If the numbers don’t match, the employer owes the difference plus interest and penalties.
Audit frequency varies by fund, but employers should expect a review at least once every three to five years, with new contributing employers often audited within the first year. A fund can also launch a special audit at any time if it suspects underreporting, such as when an employer stops filing monthly reports or a tip comes in about misclassified workers. The look-back period depends on the applicable statute of limitations and the trust agreement, and suspected fraud can extend that window significantly.
Audit scope often surprises employers. Auditors may review records for all employees, including office staff and executives, to determine whether any of them performed work covered by the CBA without being reported. Misclassifying a worker as non-bargaining-unit when they actually did covered work is one of the most common audit findings. Clean records of job assignments and hours by classification are the best defense, and those records should be retained for at least six years to cover typical look-back periods and potential disputes.