When does a Quebec employer need to register with the CNESST, and how are premiums set?
A Quebec employer must register with the CNESST within 60 days of the first day of work of its first worker, full time or part time, and can register up to 30 days before that day. The premium is the unit rate per $100 of insurable wages, counting each worker's pay only up to $103,000 in 2026.
Who has to register with the CNESST, and by when?
Your client must register once it hires at least one worker, full time or part time, and has an establishment in Quebec. The deadline is 60 days from the first day of work of the first worker, and it can register up to 30 days before that start date if it knows the date cnesst.gouv.qc.ca. A business with no workers that doesn't want optional personal or volunteer coverage doesn't need to register yet
cnesst.gouv.qc.ca.
An independent contractor can trigger registration too. Under section 9 of the Act respecting industrial accidents and occupational diseases, a contractor who does work similar to or connected with your client's business is deemed its worker, unless the work is done for several clients at once, under a service exchange, in short turns for several clients with the contractor's own equipment, or only intermittently legisquebec.gouv.qc.ca. The CNESST puts the short work line at fewer than 420 hours a year, and a contractor with employees of its own is an employer, not a deemed worker
cnesst.gouv.qc.ca. CRA status doesn't settle it: the CNESST can treat someone as a worker even when another public body calls them self employed. The federal test is on employee or self employed.
Registration happens through the CNESST online questionnaire, and as of October 2026 the CNESST warns that processing times are longer than usual cnesst.gouv.qc.ca. Entering an amount in the CNESST box of a Revenu Québec remittance slip is not a registration
cnesst.gouv.qc.ca.
What does CNESST coverage cost per $100 of payroll in 2026 and 2027?
Each employer pays the premium rate of its classification unit for every $100 of insurable wages cnesst.gouv.qc.ca. The spread between industries is wide. The 2026 rates come from the CNESST's 2026 table
cnesst.gouv.qc.ca, and the 2027 rates from the table published October 13, 2026
cnesst.gouv.qc.ca.
| Figure | 2026 | 2027 |
|---|---|---|
| Average premium rate per $100 | $1.54 | $1.71 |
| Maximum annual insurable wages | $103,000 | $105,500 (projected) |
| Maximum weekly insurable wages | $1,975.45 | $2,023.40 (projected) |
| Unit 65110: brokerage, professional services, administrative support office | $0.30 | $0.33 |
| Unit 90010: work done only in offices (exception unit) | $0.30 | $0.32 |
| Unit 68010: restaurant, fast food counter, bar | $1.21 | $1.31 |
| Unit 80110: carpentry, interior systems, painting, drywall finishing | $6.04 | $6.82 |
| Unit 80130: roofing, gutters | $7.88 | $7.86 |
The average rate is set on the CNESST's own page cnesst.gouv.qc.ca. The maximum insurable wages are too, and the CNESST says the $105,500 for 2027 will be confirmed in October 2026
cnesst.gouv.qc.ca. The table shows general rates. A federally regulated business pays the lower particular rate of its unit, and some sectors add a joint sector association contribution of $0.023 to $0.080 per $100 in 2026
cnesst.gouv.qc.ca.
Unit rate pricing applies to employers whose annual premium is generally under $11,500. Above that, medium and large employers move to a personalized rate and very large ones to retrospective pricing cnesst.gouv.qc.ca.
How much does a three person office pay the CNESST in 2026?
The annual premium is insurable wages divided by $100, times the unit rate. Insurable wages start from box A of the RL-1 slips, and each worker counts only up to the year's maximum insurable wages cnesst.gouv.qc.ca. Take a professional services office in unit 65110 with three employees in 2026:
| Employee | 2026 gross pay | Insurable wages |
|---|---|---|
| A | $60,000 | $60,000 |
| B | $85,000 | $85,000 |
| C | $120,000 | $103,000 |
| Total | $265,000 | $248,000 |
At $0.30 per $100, the premium is $248,000 / $100 × $0.30 = $744. The same payroll in roofing (unit 80130, $7.88) costs $19,542.40, which is past the level where unit rate pricing usually stops.
During the year, your client pays the premium as periodic payments: insurable wages for the period / $100 × the periodic payment rate from the CNESST cnesst.gouv.qc.ca. Assume that rate equals the $0.30 unit rate and monthly remitting. Employee C earns $10,000 a month, so cumulative pay reaches $100,000 at the end of October and $110,000 at the end of November. Only $3,000 of C's November pay is insurable, and none of December's. November's payment is ($5,000 + $7,083.33 + $3,000) / $100 × $0.30 = $45.25.
The periodic payment rate can differ from the premium rate: it includes any sector association contribution and, for an employer in several units, is a weighted average. It can't be contested, it can change partway through the year, and a new employer gets it after registering cnesst.gouv.qc.ca.
Which amounts stay out of insurable wages?
The 2026 guide lets you deduct these from the RL-1 total before applying the rate cnesst.gouv.qc.ca:
| Amount | Treatment |
|---|---|
| Pay above $103,000 per worker (2026) | Excluded as surplus |
| Pay to executive officers (president, vice president, secretary, treasurer) and directors for board work | Excluded; they can buy personal coverage |
| Amounts a partnership pays a partner | Excluded |
| Sick leave pay beyond 105 consecutive days | Excluded |
| Wages declared in another province under the interjurisdictional agreement | Excluded |
| Pay to a worker living outside Quebec who works remotely from outside Quebec | Excluded |
| Payments to contractors deemed workers under section 9 | Left out of periodic payments, but reported on the statement of wages |
The officer exclusion matters for owner managed corporations. Officers aren't covered automatically, so their pay stays out unless the corporation buys personal coverage for them cnesst.gouv.qc.ca.
What the statement of wages and late payments cost
The cycle repeats every year. The CNESST sends the classification decision with next year's rates in October, your client remits periodic payments to Revenu Québec from January to December, and the statement of wages for the prior year is due before March 15 cnesst.gouv.qc.ca. It's due even if no wages were paid. You can file it for your client through MonEspace CNESST once they delegate it to you
cnesst.gouv.qc.ca.
| Failure | Penalty |
|---|---|
| Statement of wages late | The lowest of $25 a day from March 15, 5% of the annual assessment (minimum $25), or $2,500, plus daily compounded interest on any shortfall |
| Periodic payment paid within 7 days of the due date | 7% of the late amount |
| Paid from day 8 to day 14 | 11% |
| Paid later | 15% |
| Total periodic payments for the year too low | 15% of the shortfall |
The CNESST's own example: a statement received March 26 is 12 days late, so $25 × 12 = $300, while 5% of a $5,000 assessment is $250, and $250 is charged cnesst.gouv.qc.ca. The instalment penalties come from the 2026 guide and are billed on the CNESST assessment notice, payable to the CNESST rather than Revenu Québec
cnesst.gouv.qc.ca.
What happens when a client registers late?
If the CNESST finds an unregistered employer, it bills the premium and administration charges for every year the employer should have paid, plus late instalment penalties and late statement penalties and interest for all those years. An employer that registers voluntarily still owes the premium and charges for every year, but the penalties are limited to the current year and the 3 previous years if it was never registered, wasn't targeted by a CNESST detection process, has no injury or safe maternity claim on file, and cooperates cnesst.gouv.qc.ca.
For a late registrant, the instalment penalty runs from the 15th of the month after the 60 day deadline, and from the 15th of each later month before the application. The first periodic payment covers all wages since the first worker's first day, even when that day was in the previous year cnesst.gouv.qc.ca.
Check the classification decision as soon as it arrives. Only the classification can be challenged: within 30 days by asking the CNESST for a review, or within 60 days before the Tribunal administratif du travail. The premium rate and periodic payment rate can't be contested cnesst.gouv.qc.ca. Ontario runs a separate system; see WSIB coverage in Ontario.
Sources
Does a corporation whose only paid person is its president need to register?
Usually not. Officers aren't covered automatically, so a corporation with no other worker has nobody who triggers mandatory registration, and the CNESST says a business without workers only registers if it wants optional coverage such as personal coverage cnesst.gouv.qc.ca. The day it hires an employee, or uses a contractor deemed a worker, the 60 days start.
Is the CNESST premium paid to the CNESST or to Revenu Québec?
Both, at different steps. Periodic payments go to Revenu Québec on the same remittance slip and schedule as source deductions, and Revenu Québec passes them on cnesst.gouv.qc.ca. Any balance on the assessment notice, and any penalty, is paid to the CNESST. An employer with no source deductions remits monthly, by the 15th for the previous month's wages. Federal remittance timing is on payroll remittance due dates.
What does a client owe when its last employee leaves?
A final periodic payment and an early statement of wages. The last payment goes to Revenu Québec no later than the 7th day after the last worker permanently stops working, with the source deductions cnesst.gouv.qc.ca. The statement of wages is due within 45 days of that departure instead of by March 15
cnesst.gouv.qc.ca.
General information for the tax year shown, not advice for a specific client. Confirm the facts before you file or remit.