Reconciliation form guide

Enter the total gross earnings for all employees including the earnings of out of province employees who do work in Ontario, and executive officers as reported on Line 14 of the T4 summary.

You're responsible for reporting earnings for:

• anyone you employ in your business, including family. Full-time, part-time, seasonal or temporary employees, certain domestic employees, unregistered individuals engaged in construction work, students, apprentices, learners and training participants.
• yourself – if you're an independent operator, sole proprietor, partner or executive officer in the construction industry. Review our Expanded Compulsory Coverage in Construction policy for exceptions.

For details and exceptions, please review our Determining Worker and Independent Operator Status policy.

If you amend a T4, T4 Summary or other earnings after filing the WSIB reconciliation, you must report the amendment to us.

Additional information for construction businesses

Independent operators, sole proprietors and partnerships

No additional information.

Corporations

Enter the total gross T4 earnings for all executive officers as reported on line 14 of the T4 Summary.

Enter the total gross earnings not reported on T4s for all employees. If T4As have been issued to contractors/subcontractors, refer to box 3. Include the non-T4 earnings of executive officers.

Learn more about insurable earnings. You can find a complete list of insurable gross earnings and non-insurable gross in our Determining Insurable Earnings policy.

Additional information for construction businesses

Independent operators

No additional information

Sole proprietors

Enter the total gross earnings not reported on T4s for all employees. Include T4As (except those issued to contractors/subcontractors).

Enter the net business income (Line 135 – T1 General or T2125 Statement of Business or Professional Activities) for the sole proprietor’s earnings. If the net business income is zero or negative, enter $0.

If the net business income is unknown, use the minimum amount (one-third of our annual maximum) unless the annual estimated amount is greater. Report the actual amount when you know the net business income or T2125 is filed.

Find examples of how to calculate insurable earnings for sole proprietors with employees.

Don't report sole proprietor’s earnings if the sole proprietorship met the requirements for the home renovation exemption for all of 2024.

Partnerships

Enter the total gross earnings not reported on T4s for all employees. Include T4As (except those issued to contractors/subcontractors).

Enter the net business income (Line 135 – T1 General or T2125 Statement of Business or Professional Activities) for partners’ earnings. If net business income is zero or negative, enter $0.

If you don't know the net business income, use the minimum amount (one-third of our annual maximum). Report the actual amount when you know the net business income or T2125 is filed.

Find examples of how to calculate insurable earnings for partners in a partnership (with or without employees)

Don't report the partners’ earnings if the partnership met the requirements for the home renovation exemption for all of 2024.

Corporations

Enter the total gross earnings not reported on T4s for all employees and/or executive officers (if applicable) including T4As, T5s etc. (except those issued to contractors/subcontractors).

Find examples of how to calculate insurable earnings for executive officers of a corporation with employees.

Don't report executive officers’ earnings if the corporation met the requirements for the home renovation exemption for all 2024.

Learn more about our Insurable Earnings – Construction policy.

If you didn't engage contractors/subcontractors, proceed to box 4.

If you had contractors/subcontractors who we considered your employees (workers), enter their total insurable gross earnings on this line. 

Learn more about gross earnings of contractors/subcontractors.

Additional information for construction businesses

Independent operators

Report the total of the labour portion of all your contracts/invoices for 2024 on this line.

Learn more about the labour portion of contracts regarding adequate and inadequate records in the labour only in the glossary.

Review examples of how to calculate insurable earnings for independent operators.

Sole proprietors, partnerships, and corporations

If you made payments to contractors/subcontractors who we considered to be your employees (workers), enter their total insurable gross earnings based on the labour portion of the contracts.

Review our Insurable Earnings policy to learn more. 

Only businesses with volunteer forces (fire, ambulance, and police) should complete the Schedule for Volunteer Forces. Enter the total in box 4 on the reconciliation form. All other businesses should proceed to box 5.

If there is no pre-printed amount in this box, proceed to box 6.

The pre-printed amount is the total optional insurance amount that was in effect for sole proprietors, partners, independent operators or executive officers for this reconciliation period. Don't change this amount.

Attachment 1 gives details of optional insurance for all persons covered during this reconciliation period, for your information and records. The total amount of insurable earnings, on Attachment 1, for all persons with optional insurance, should equal the amount of optional insurance in box 5 on the reconciliation form.

Add boxes 1 to 5 and enter the total in box 6. Amounts under volunteer forces (box 4) and optional insurance (box 5) are fully insurable and aren't subject to deduction.

Additional information for construction businesses

Independent operators

This is the total labour portion from box 3 or optional insurance from box 5.

Enter any non-insurable gross earnings included in box 1 and 2, including the portion of earnings of out of province employees for work done in other Canadian jurisdictions outside of Ontario.

Learn more about our Determining Insurable Earnings policy. 

If you have out of province employees, or employees who work in more than one Canadian Province or territory, review our policy on Non-resident Workers and Insurable Earnings - Interjurisdictional Agreement for more information.

Additional information for construction businesses

Independent operators

Not applicable to independent operators.

Sole proprietors, partnerships, and corporations

Enter any non-insurable gross earnings included in box 1 and 2.

Enter the sole proprietor’s earnings, partners’, and executive officers’ gross earnings included in box 1 and 2 for any time period during the year they were exempt from mandatory coverage because they met the requirements of the home renovation exemption (three-month minimum coverage).

For more information, review our Insurable earnings – construction policy.

For businesses that aren't in the construction industry, enter the total executive officers’ gross earnings included in boxes 1 and 2.

Additional information for construction businesses

Independent operators

Not applicable to independent operators.

Sole proprietors

Not applicable to sole proprietors with employees.

Partnerships and corporations

Enter the partners’ and executive officers’ earnings included in Total earnings per T4 Summary and Other earnings not on T4 Summary for the time period they were exempt from mandatory coverage because of a WSIB approved exemption for one partner or executive officer in the partnership/corporation.

If you have employees or contractors whose gross earnings exceed the 2024 annual maximum insurable earnings ($112,500), enter the total excess earnings in box 9.

If you're closing an account in 2025, the 2025 maximum insurable earnings ceiling is $117,000.

To calculate each individual employee’s (or contractor’s) excess earnings, subtract the annual maximum insurable earnings from their total earnings reported in boxes 1, 2 and/or box 3, if applicable.

Additional information for construction businesses

Independent operators

If the total gross earnings before deductions exceeds the annual maximum of $112,500 for 2024, deduct the difference.

Sole proprietors and partnerships

If the net business income for the sole proprietor (after any deductions for non-insurable gross earnings) exceeds the annual maximum of $112,500 for 2024, deduct the difference. 

Corporations

If the T4 earnings for an executive officer (after any deductions for non-insurable gross earnings) exceeds the annual maximum of $112,500 for 2024, deduct the difference.

Add boxes 7, 8 and 9. Enter the total here.

Additional information for construction businesses

Independent operators

Amount in excess earnings, if applicable.

Sole proprietors, partnerships, and corporations

The addition of boxes 7 to 9 is the total amount in this line.

Subtract the amount in box 10 from the amount in box 6 and enter the difference in box 11.

These are the total insurable earnings on which premium calculations are based.

For accounts with only one NAICS code, all earnings are considered direct. Learn more about allocating direct earnings and common earnings.

You must complete section B to ensure the insurable earnings are allocated correctly. You'll have one or more pre-printed or pre-populated NAICS code on the form.

One NAICS code preprinted in section B

Enter the amount from box 11 in column A, direct earnings and in column C, insurable earnings.

Proceed to section C - premium calculation.

Two or more NAICS codes preprinted in section B

Businesses reporting under multiple NAICS codes must maintain segregated earnings records for each NAICS code.

You must assign the insurable earnings of each employee, including optional insurance amounts (included on Attachment 1, if applicable) to one or more of the NAICS codes.

In most cases you'll have earnings that apply directly to each NAICS code and earnings that are common to two or more NAICS codes.

Additional information for construction businesses

Independent operators, sole proprietors, partnerships and corporations

Total allocated insurable earnings

Total earnings for all NAICS codes.

Add up the direct earnings assigned to each NAICS code. Enter the total in section B of the form beside the appropriate NAICS code in column A, direct earnings.

If you have no common earnings, also enter the direct earnings totals into column C, insurable earnings.

Proceed to section C - Premium calculation.

Transfer the common earnings for each NAICS code from column 3 on the

Transfer the insurable earnings for each NAICS code from column 4 on the worksheet to column C, insurable earnings on the reconciliation form.

For details on how to calculate and prorate common earnings for businesses with multiple NAICS, learn more about assigning insurable earnings.

Additional information for construction businesses

Employers in the construction industry who are classified as non-exempt partners and executive officers in construction, can't assign common earnings to these classifications.

Transfer the insurable earnings (section B column C) for each NAICS code to the appropriate NAICS code under (column C).

Add all entries under section C, column C and enter the total in box 12. If this amount does not equal the amount in section A, box 11, review your calculations.

To calculate the premium for each NAICS code, multiply the amount in column C by the premium rate pre-printed on the form in column D, then divide by 100.

Premium = insurable earnings x premium rate ÷ 100

Enter the result in the NAICS code premium column. Add up the premiums for all the NAICS codes and enter the total or the $100 minimum premium (whichever is more) in box 13.

A minimum premium of $100 applies to accounts open during any part of a calendar year, even if no premiums are reported.

This amount shows our record of the total premium amount already reported on all premium remittance forms for the reconciliation period covered and reflects any further revisions or adjustments we've processed by the date the reconciliation form is printed or made available online.

Calculated by subtracting the total premium amount reported from the total premium amount.

Reconciled difference = total premium amount reported - total premium amount.

If this amount is positive, that amount should go in the amount due section.

If this amount is negative, that amount should go in the credit to account section.

If the amount is zero, please continue and submit your reconciliation.

If your account is open, we'll apply the year end reconciliation credit (plus interest) to any balance owing on your account for this or upcoming reporting periods.

If your account is closed and there is a net credit, we'll refund the credit.

This is the amount you owe us.

Enter the amount of the payment you're making.

Authorized contact

An authorized contact has been given authorization by a corporate officer in your company or someone who would normally have access to, and control of, the information to be released.

Examples include sole proprietors, partners, presidents, vice-presidents, general managers, chief financial officers, controllers, directors of finance, safety officers and other people with access to confidential business information.