WSIB Ontario fax numbers
The Workplace Safety and Insurance Board (WSIB) lists 416-344-4684 and toll-free 1-888-313-7373 as its fax numbers. Appeals: 416-344-3600.
Last checked: October 31, 2026
Always check the number on your letter or form instructions. Agencies can change fax numbers without notice.
| Purpose | Fax number | Who can use it | |
|---|---|---|---|
| WSIB main fax (claims and accounts) | 1-888-313-7373 | Toll-free | Send fax to this number |
| Source: wsib.ca, checked October 31, 2026 — Contact us page, updated July 30, 2026. WSIB also offers online document submission. | |||
| WSIB main fax (claims and accounts), local number | 416-344-4684 | Send fax to this number | |
| Source: wsib.ca, checked October 31, 2026 — Same page. | |||
| WSIB Appeals | 416-344-3600 | For appeals and disputes | Send fax to this number |
| Source: wsib.ca, checked October 31, 2026 — Listed under Appeals on the contact page. | |||
| WSIB Collections Branch | 905-521-4203 | Only for collections matters | Send fax to this number |
| Source: wsib.ca, checked October 31, 2026 — Listed under WSIB Collections Branch. | |||
How to fax WSIB Ontario online
- Put your claim number or account number on every page.
- Choose the right number: main fax for claims and accounts, 416-344-3600 for appeals.
- Combine the pages into one PDF.
- Send it and keep the delivery report.
From $2.89 for 1–5 pages, no account and no subscription. You get a delivery report by email; if the fax cannot be delivered, the payment is refunded automatically.
What to include
- Claim number or WSIB account number
- The form or letter you are sending
Online submission
WSIB also offers online document submission.
Cover sheet tips
A cover sheet is the first page the clerk sees, so keep it short: who the fax is for, your full name, your reference number, the subject in one line and the total number of pages including the cover. You can fill one in with our free fax cover sheet generator and save it as a PDF. More tips: what to include on a fax cover sheet.
Frequently asked questions
What is the WSIB fax number?
1-888-313-7373 toll-free or 416-344-4684, as listed on the WSIB contact page.
Is there a separate fax for WSIB appeals?
Yes, the contact page lists 416-344-3600 for appeals.
Can I fax WSIB from outside Canada?
Use the local number 416-344-4684. Toll-free numbers often do not work from abroad.