Quick answer: peak season is when staffing compliance risk is highest, because you add temporary and new workers fast, lean on more suppliers, and cut onboarding short, exactly the conditions regulators watch. The six risks that bite hardest in 2026 are using an unlicensed temporary help agency, joint liability for unpaid wages, misclassifying workers as contractors, WSIB and workplace-safety gaps, payroll and record-keeping failures, and temporary foreign worker non-compliance. The exposure is real: Ontario now fines clients who use an unlicensed agency, and federal penalties for foreign-worker violations reach $100,000 per breach. The good news is that every one of these is avoidable with a licensed, verified staffing partner and a short pre-peak checklist.

A compliance problem rarely surfaces on a quiet week. It surfaces in December, on a busy night shift, when a worker is hurt, a paycheque bounces, or an inspector calls, and the volume that made peak profitable is the same volume that makes a gap expensive. Critically, much of the liability lands on the client, not just the agency. This guide breaks down the six risks that matter most, what each can cost, and the concrete steps to close them before the surge.

What’s in This Guide

• Why Compliance Risk Spikes at Peak
• The 6 Compliance Risks
• Who Is Liable, and What It Can Cost
• A Pre-Peak Compliance Checklist
• How Trimax Keeps Your Peak Compliant
• The Bottom Line

Why Compliance Risk Spikes at Peak

Peak concentrates every risk factor at once. You hire more people in less time, bring on temporary and seasonal workers who are new to your site, and often add a second or third staffing supplier to cover the surge. New workers are the most exposed: an Institute for Work and Health analysis found that workers in their first month on a job have about four times the lost-time injury claims of workers who have been in the role more than a year. Layer on rushed onboarding, unfamiliar equipment and long shifts, and peak becomes the period when safety, payroll and eligibility gaps are most likely to open and most likely to be noticed.

And the liability increasingly follows the worksite. Ontario now holds clients responsible for using licensed agencies, makes clients jointly liable for temp workers’ wages, and treats the business that controls the workplace as an employer for health and safety. Federally, foreign-worker penalties sit with the employer of record. Using a staffing agency does not outsource the risk; it shares it, so the agency you choose and the checks you run are part of your own compliance posture.

The 6 Compliance Risks

1. Using an unlicensed temporary help agency

The risk. Since July 1, 2024, temporary help agencies and recruiters in Ontario must hold a provincial licence, and it is a violation of the Employment Standards Act for a client to knowingly engage an unlicensed agency, per the Government of Ontario. This is a newer rule that many operators still miss when they add a supplier in a hurry for peak.

What it costs. Penalties under the ESA run $15,000 for a first violation, $25,000 for a second and $50,000 for a third within a three-year period, and the province publishes a searchable public registry of licensed agencies. Check the licence and record the licence number before you sign a peak contract; if a prospective agency cannot produce one, that is the end of the conversation. Trimax operates as a licensed, compliant agency, which is the first box a client should tick.

2. Joint liability for unpaid wages

The risk. Under Ontario’s Employment Standards Act, a client of a temporary help agency is jointly and severally liable with the agency for the regular wages and overtime of the assignment workers placed with it, per Ontario’s ESA rules for temporary help agencies. If the agency fails to pay, the workers can pursue the client. Fee-charging is also banned: an agency cannot charge a worker a fee to be placed.

What it costs. You can be ordered to cover wages you thought you had already paid the agency for, plus the administrative time and reputational cost of a claim landing on your site. The practical defence is to work with a financially sound agency that runs its own payroll cleanly and to keep the placement records that show hours and rates. A partner that tracks hours from a verified check-in and flows them straight into payroll, as Trimax does, makes this liability far easier to manage. A worked example: if an agency paying $18 an hour to 40 assignment workers folds in mid-December owing two weeks of wages, that is roughly $57,600 you could be ordered to cover, on top of what you already paid the agency.

3. Misclassifying workers as independent contractors

The risk. To move fast at peak, some operations engage extra hands as “contractors” on a flat rate. If those people are really employees in how they are directed, scheduled and paid, that is misclassification, and the ESA prohibits treating an employee as if they were not one. The Canada Revenue Agency can rule on the true relationship, per CRA’s employee-versus-self-employed guidance.

What it costs. A reassessment can mean unremitted CPP and EI contributions (both the worker’s and the employer’s share), plus penalties and interest, and back-pay for ESA entitlements such as overtime, vacation pay and public-holiday pay. A misclassified “contractor” who is later found to be an employee can also trigger termination and severance obligations. Because CPP and EI carry both the employee and employer shares, a group of misclassified peak workers can turn into a five-figure reassessment quickly, and the CRA can look back over prior years, not just the current one. Placing peak workers through an agency that carries them as employees on its own payroll removes this exposure entirely.

4. WSIB and workplace-safety gaps

The risk. Most Ontario employers must register for and carry WSIB coverage, per the WSIB, and on your site you are an employer under the Occupational Health and Safety Act with a duty to train and protect temporary workers just like permanent staff, per Ontario’s OHSA guide. Peak is the danger zone: with a flood of new workers who face roughly four times the first-month injury risk, a thin safety orientation is both a human and a legal liability.

What it costs. An injury to an uncovered or poorly trained worker can expose you to WSIB cost, OHSA orders and prosecution, and stop-work on your busiest day. Confirm your agency carries WSIB in good standing (ask for a clearance certificate), and make sure every temporary worker gets the same site-specific safety orientation and equipment as your own crew before their first shift.

5. Payroll, source deductions and record-keeping

The risk. Whoever is the employer of record must deduct and remit CPP, EI and income tax, pay vacation and public-holiday pay, and keep the records the ESA requires, per Ontario’s Employment Standards Act. At peak, high volumes of short assignments and overtime are exactly where hours get mis-recorded and holiday pay gets missed, and the ESA requires employers to keep hours-of-work and wage records for years, not weeks.

What it costs. Errors surface as CRA remittance penalties, ESA complaints for unpaid overtime or vacation pay, and painful reconciliations in January. Because December straddles a statutory holiday period, public-holiday pay mistakes are especially common. The cleanest protection is a partner that automates time capture and payroll for the workers it places, so the records are accurate and retained without you rebuilding them after the season.

6. Temporary foreign worker non-compliance

The risk. If any part of your peak crew involves temporary foreign workers, the compliance bar is high and the penalties are federal. Employers must meet the conditions of the Labour Market Impact Assessment, and low-wage applications are now refused in metro areas with 6% or higher unemployment, capped at 10% of a worksite, with an eight-week advertising rule, per Employment and Social Development Canada.

What it costs. Administrative monetary penalties reach $100,000 per violation to a maximum of $1 million a year, alongside temporary or permanent bans and publication on the public list of non-compliant employers, per ESDC’s employer-compliance rules. Enforcement is rising: ESDC issued more than $10.2 million in penalties in the 2025 to 2026 fiscal year, more than double the year before, and banned 30 employers. For a fast peak fill, a domestic, pre-screened workforce sidesteps this risk entirely, which is why most employers now staff the surge domestically.

Who Is Liable, and What It Can Cost

Compliance exposure at peak is shared between the staffing agency and the client that controls the worksite. This table summarises where each risk lands and the order-of-magnitude cost.

Sources: Government of Ontario (temporary help agency licensing), Ontario ESA, WSIB, Ontario OHSA guide and Employment and Social Development Canada. Ontario figures apply provincially; other provinces have equivalent employment-standards, workers-compensation and health-and-safety regimes.

A Pre-Peak Compliance Checklist

Most of this risk closes with a short checklist run before the surge. Work through these seven steps with any staffing partner before your first peak shift:

How Trimax Keeps Your Peak Compliant

Compliance is built into the placement, not bolted on afterward. Trimax Employment is a Canadian, licensed, technology-enabled staffing company that places warehouse, logistics, production, packaging and general-labour workers from a pre-screened, domestic pool. Every worker is verified through Trimax Verify for identity and eligibility before they reach a site, hours are captured from a geofenced check-in and flow straight into payroll, and workers are carried as employees with full deductions and WSIB coverage. Compliance is treated as a condition of every placement, which keeps a fast peak fill from turning into a liability. To compare national options, see our guide to the best staffing agencies for Q4 and peak-season hiring, or contact the Trimax team to plan a compliant peak crew.

The Bottom Line

Peak season concentrates hiring, new workers and suppliers at the exact moment compliance is hardest to hold, and in 2026 more of the liability sits with the client: Ontario fines businesses that use unlicensed agencies, makes them jointly liable for temp wages, and treats them as the safety employer, while federal foreign-worker penalties reach $100,000 a violation. None of it is hard to avoid. Use a licensed, verified agency, confirm WSIB and payroll, train every temporary worker, and keep the foreign-worker route out of your fast fills. To plan a compliant crew, see how the national agencies compare for peak or contact Trimax.

Frequently Asked Questions