A well-drafted Ontario offer letter states the job, pay, hours and start date clearly, meets every Employment Standards Act minimum, is signed before the first day of work, and contains a termination clause that does not fall below the ESA. Since July 1, 2025, employers with 25 or more employees must also give new hires written employment information before their first day, or where that is not practicable, as soon after as is reasonably possible.
Why the letter matters more than the handshake
A company opening its first Canadian office often sends the same offer letter it uses at head office, translated. A local startup copies a template from the internet. Both letters say the job is "at will" or that the employee can be dismissed with "two weeks' notice". In Ontario, both lines are unenforceable, and the employer ends up owing common law notice it never planned for. The letter is the one document that decides what a termination costs years later.
What the ESA will not let you contract out of
The Employment Standards Act sets minimums that no agreement can reduce: minimum wage, hours of work and overtime, vacation and public holidays, leaves of absence, and termination and severance entitlements. A clause that promises less is void, and in the case of termination clauses, Ontario courts have held that one defective sentence can void the entire termination provision.
What written information must new hires receive?
Since July 1, 2025, employers with 25 or more employees on a new employee's first day must give that employee written information before the first day of work, or only where that is not practicable, as soon after the first day as is reasonably possible: the employer's legal name and any operating name, contact information, a general description of the initial work location, the starting wage or rate, the pay period and pay day, and a general description of the initial anticipated hours (ontario.ca, Your guide to the ESA, Mandatory information for employees). Employers below 25 are exempt, but a well-drafted offer letter covers the same points and is good practice at any size.
The clauses an Ontario offer letter should contain
- Position, reporting line, work location and whether the role is remote or hybrid.
- Start date and, if used, a probationary period that still respects ESA notice after three months.
- Compensation: rate, pay period, overtime treatment, bonus and commission terms with clear conditions.
- Hours of work, and any arrangement for excess hours or averaging, which the ESA treats as a separate matter from the offer letter.
- Vacation and benefits, at or above ESA minimums.
- Termination clause that meets the ESA in every scenario, including for cause, and provides for benefits continuation.
- Confidentiality and intellectual property.
- No non-compete clause for most employees, since Ontario has prohibited them for agreements entered into on or after October 25, 2021, with exceptions only for defined executives and for the seller of a sole proprietorship or partnership who becomes the buyer's employee (ESA s. 67.2). See our article on non-compete clauses.
- A statement that the ESA applies and the employee was given time to review and seek advice.
- Signature by the employee before work begins. As a matter of practice, a contract signed after the start date is open to challenge for lack of fresh consideration, so get advice before relying on one.
Common mistakes we see in Ontario offer letters
- "At-will employment" language copied from US templates. Ontario has no at-will employment.
- A fixed notice period such as two weeks that falls below the ESA for longer service.
- A for-cause clause broader than the ESA's wilful misconduct standard, which can void the whole termination provision.
- A non-compete clause for an ordinary employee.
- A letter signed on the first day or later with nothing new given in exchange.
FAQ
Is an offer letter the same as an employment contract in Ontario?
A signed offer letter that sets out the terms is an employment contract. The name does not matter; the content and the timing of signature do.
Can I include a probation period?
Yes, but the ESA still requires notice after three months of service regardless of what the letter calls the period.
Do I have to state the salary range in the job posting?
Since January 1, 2026, employers with 25 or more employees on the day a job is publicly posted must state the expected compensation or a range no wider than 50,000 dollars a year, unless the expected compensation or the top of the range exceeds 200,000 dollars a year (ontario.ca, Your guide to the ESA, Requirements related to publicly advertised job postings). Employers below 25 are exempt. The offer letter should match what was posted.
Can I write the offer letter in Korean?
As a matter of practice we keep the signed version in English for use in Ontario and provide a Korean version or explanatory notes to the employee or head office.
What if my existing employees signed weak contracts?
Changing terms for an existing employee is where many employers run into trouble. In practice employers offer something new in exchange, such as a raise or a signing payment, and get advice first. Ask OptiMaxWork AI or a professional before re-papering. For a hospitality example, see Ontario hospitality employment agreements.
Drafting an offer letter for a Canadian hire? OptiMaxWork AI checks your Ontario question against official sources and shows them, in English or Korean. Ask your question.
For information only, not legal advice, and no lawyer-client relationship is created. Figures and rules were checked against the Ontario Employment Standards Act, 2000 (ss. 5, 54, 57, 67.2 and Part III.1), ontario.ca Your guide to the ESA (Mandatory information for employees; Requirements related to publicly advertised job postings; Non-compete agreements) and Waksdale v. Swegon North America, 2020 ONCA 391, and against an OptiMaxWork AI verified report, then reviewed by an SHRM-SCP. Confirm current sources before acting.