How to Respond to a Ministry of Labour Complaint in Ontario

A Ministry of Labour complaint Ontario employer situations create is not a suggestion to respond when convenient. The moment an Employment Standards Officer (ESO) contacts your business, a formal investigation has already started. Employers who treat it casually -- waiting to gather documents, giving vague answers, or saying nothing at all -- often end up with orders they could have avoided. This guide covers exactly what to do from the moment you receive notice, what traps to avoid, and when the situation calls for outside help.

Ontario’s Employment Standards Act, 2000 (ESA) gives employees a straightforward way to file a complaint: online or by phone, at no cost, within two years of the alleged violation. The Ministry investigates claims involving unpaid wages, overtime, vacation pay, termination pay, public holidays, and leaves of absence. If an officer determines a violation occurred, they can issue a compliance order, a payment order, or both. Repeat offenders face fines up to $100,000 or more for corporations. The stakes are real.

What the Ministry of Labour Investigation Process Actually Looks Like

After an employee files a complaint, the Ministry assigns an ESO to the file. The officer reviews the claim, then contacts the employer -- usually in writing -- to request documents and, in some cases, schedule interviews. The ESO is not your advocate and is not the employee’s advocate either. Their job is to determine whether the ESA was followed and, if not, what remedy applies.

You will typically receive a letter identifying the complainant, the nature of the allegation, and the specific ESA provisions at issue. You will be given a deadline to respond and produce records. That deadline is real. Failing to comply with an officer’s request is itself a violation of the ESA and can result in additional penalties on top of whatever the original complaint alleged.

The officer will review the records you provide, weigh them against the employee’s account, and apply a best-available-evidence standard. If you have no records and the employee does, the officer will rely on the employee’s version. If neither party has records, the officer has discretion to make reasonable inferences -- often not in the employer’s favour.

What Ontario Law Actually Requires You to Produce

Under the ESA, employers are required to keep records for employees for a minimum of three years. Those records include: hours of work by day and week, wages paid, vacation time taken and accrued, public holiday pay calculations, and leaves of absence. If the complaint involves termination, you will also need written notice documentation, any severance pay calculations, and the employment contract.

As of July 1, 2025, employers with 25 or more employees must also provide written employment information to new hires before their first day -- including legal employer name, contact information, starting wage, pay period, pay day, anticipated hours, and work location. If a complaint arises from a newer hire, the ESO may ask whether that information was delivered. Not having it documented is a liability.

For any complaint involving job postings after January 1, 2026, employers with 25 or more employees must retain copies of public job postings for three years after removal. Those postings must have included expected compensation ranges, a declaration of whether an actual vacancy existed, and disclosure of any AI use in screening. This is now enforceable, not optional.

Common Mistakes Ontario Employers Make When Responding

The most common error is doing nothing quickly enough. Employers receive the officer’s letter, forward it to whoever handles payroll, and assume the matter will sort itself out. It will not. Every day of delay narrows your window to gather evidence, locate witnesses, and build a coherent response. The ESO has a file open. You should treat it the same way.

The second most common mistake is retaliating against the complainant. Section 74 of the ESA prohibits any form of reprisal against an employee who has filed or is about to file a complaint, or who has exercised any right under the Act. This includes termination, demotion, schedule changes, and harassment. If the ESO finds you took reprisal action, that becomes a separate violation with its own set of penalties -- independent of whether the original complaint had merit.

Third: assuming the Ministry is just going to go away. Officers have authority to enter your workplace, interview employees without management present, and examine any records related to the complaint. They can also expand the scope of their review if what they find suggests broader non-compliance. A complaint about one employee’s overtime can become an audit of your entire overtime practices across all staff.

Fourth: providing incomplete or inconsistent records. Gaps in payroll records, timesheets with inconsistent entries, or missing signed agreements all raise credibility questions. An officer who sees messy records will generally assume the mess conceals something. Organized, complete documentation signals that you have been running a compliant operation.

Practical Steps to Take From the Day You Receive Notice

Start with a litigation hold. Pull and preserve all records related to the complainant: their employment contract, offer letter, any amendments, all pay stubs, timesheets or scheduling records, performance notes, and any written communications with them. Do this before anyone edits, deletes, or “updates” anything. Altering records after a complaint is filed is not just bad strategy -- it can constitute obstruction.

Read the specific ESA provisions identified in the officer’s letter and understand exactly what is alleged. Do not assume you know what the complaint is about based on the employee’s name or a vague guess. The officer will tell you what section is at issue. Respond to that, not to your assumption about what the employee might be upset about.

Prepare a written response that is factual, organized, and direct. Address each allegation with corresponding documentation where you have it. If you believe the claim lacks merit, say so plainly and explain why. If there is a legitimate discrepancy -- perhaps an administrative error in vacation pay -- acknowledging it and correcting it immediately often results in a more favourable outcome than fighting a provable mistake.

Communicate with the ESO professionally and on time. If you need more time to gather records, ask for it before the deadline -- not after. Officers generally grant reasonable extensions when asked in good faith. Ignoring a deadline without explanation puts you in a far worse position.

Complaints Under OHSA and OHRC Are a Different Process

Not every complaint that touches the workplace goes through the Ministry of Labour in the same way. Occupational Health and Safety Act (OHSA) complaints involving workplace violence, harassment, or safety hazards are investigated by Ministry inspectors, but the process is different from an ESA claim. Workers are expected to raise issues internally first under the Internal Responsibility System. If the internal process fails, inspectors can enter your workplace, issue orders, and in serious cases lay charges under the OHSA. Workplace violence and harassment complaints in particular require a documented internal investigation -- your program, your records, and your response to any complaints all become part of the inspector’s review.

Human rights complaints under the Ontario Human Rights Code (OHRC) do not go to the Ministry of Labour at all. They go to the Human Rights Tribunal of Ontario (HRTO). An ESO has no authority to address discrimination or accommodation failures -- those require a separate application to the HRTO. Importantly, an employee can pursue both an ESA complaint and an HRTO application if different issues are at stake. A wrongful dismissal that also involved a failure to accommodate a disability can lead to simultaneous proceedings in two different forums with different remedies available in each.

What Happens If the Officer Finds Against You

If the ESO concludes the ESA was violated, they can issue an order to pay wages, an order to comply, or both. Payment orders can cover unpaid wages, overtime, vacation pay, public holiday pay, and termination or severance pay. If reinstatement is warranted in a reprisal case, that can also be ordered. Orders are enforceable in the same way as a court judgment.

Beyond the payment itself, employers can face fines for the violation. For individuals, fines run up to $10,000. For corporations on first offence, fines can reach $100,000. Repeat offenders face higher amounts. Directors and officers of corporations can be held personally liable in certain circumstances, particularly where wages were not paid.

You have the right to request a review of an ESO’s order before the Ontario Labour Relations Board (OLRB). That review is de novo -- you can present your full case. But the window to file is 30 days from the date of the order, and that deadline is strict. Missing it means the order stands. If you believe the officer got it wrong, you need to move immediately.

When to Get Professional Help

Most Ministry of Labour complaints can be managed by an employer who has their records in order and responds promptly. You do not always need outside help. But certain situations call for it: when the complaint involves multiple employees or a pattern of alleged violations, when the officer has indicated the scope of the review is expanding, when parallel proceedings are underway (an HRTO application, a civil claim, or a grievance), or when the facts are genuinely disputed and the stakes of losing are significant.

Getting help early is almost always better than getting it after an order is issued. Once an order is on the file, your options narrow. A 30-day review window sounds comfortable until you are gathering documents, preparing submissions, and trying to understand the OLRB process under a hard deadline. An HR advisor or legal counsel retained at the notice stage can help you structure your response correctly the first time, identify whether there are legitimate defences the officer has not yet considered, and avoid the most common mistakes that turn manageable complaints into expensive outcomes.

If you have received a Ministry of Labour complaint and want to understand your position before responding, a 20-minute call is the right first step. There is no obligation, and the conversation will give you a clear picture of what you are dealing with and what to do next.