Information from Owner
The following calculator allows you to determine the payment deadlines for your project, under the prompt payment regime under the Construction Act of Ontario effective January 1, 2026. The date of submission and date of receipt may vary. Please check your contract for the actual or deemed date of receipt. For more help understanding Ontario’s Construction Act and other construction issues, please visit our Construction toolkit page.
To use this calculator you must enter the details requested below:
Enter the date of receipt or deemed receipt of proper invoice* by the Owner.
Use of the Owner Payment Date Calculator is subject to Osler’s Terms of Use. Use this calculator tool at your own risk.
*Definition of proper invoice under the Construction Act
“Proper invoice” means a written bill or other request for payment for services or materials in respect of an improvement under a contract, if it contains the following information and, subject to subsection 6.3 (2) of the Construction Act, meets any other requirements that the contract specifies:
1. The contractor’s name and address.
2. The date of the invoice and the period, milestone or other contractual payment entitlement to which the invoice relates.
3. Information identifying the contract or other authorization under which the services or materials were supplied, such as a contract number, contract line item number or purchase order number.
4. A description, including quantity where appropriate, of the services or materials that were supplied.
5. The amount payable for the services or materials that were supplied, and the payment terms.
6. The name, title, telephone number and mailing address of the person to whom payment is to be sent or, if payment is to be sent to an office or department, its name, mailing address and telephone number.
6.1 Any other information that is necessary for the proper functioning of the owner’s accounts payable system that the owner reasonably requests.
7. Any other information that may be prescribed.
An invoice that does not meet the requirements referred to in the definition of “proper invoice” is deemed to be a proper invoice unless, no later than seven days after receiving the invoice, the owner notifies the contractor in writing of the deficiency and of what is required to address it.
