Ontario.
Know your starting point.

The proper invoice sets the pace. The owner’s payment window and the notice window run alongside one another.

Prompt-payment framework in force

Scope comes before calculation.

Prompt-payment applicability depends on the contract and procurement transition rules, not just the date on an invoice. Check section 87.3. The rules changed again on 1 January 2026; use the applicable version.

The owner’s notice is Form 1.1. Different forms and timing apply further down the payment chain. See section 6.4 and O. Reg. 303/18.

Read the governing statute

28days · ordinary owner payment14days · owner notice window

Eligible proper invoices only. Holdback, notices and counting rules can affect the result.

Try the deadline calculator

Explore the fundamentals.

General guides with Ontario context

Payment deadlines

Proper invoices

Notices of non-payment

Adjudication

Holdback

Lien rights

Keep the primary sources close.

Construction Act, R.S.O. 1990, c. C.30 (consolidated)O. Reg. 303/18 (Forms 1.1-1.5, Form 6, Form 8)O. Reg. 264/25 (Adjudications under Part II.1)Prescribed construction-lien forms

Edition: 4 October 2026. Regime status and linked instruments must be checked again before relying on a live deadline.

Ontario.Know your starting point.