Payment Holdback Required: Construction or Renovation Relations | DK Legal Practice


Last Updated: August 22 2026

Question:Is it illegal in Ontario to pay a construction contractor the final invoice in full without holding back 10%?

Answer:DK Legal Practice can help you understand Ontario construction payment holdbacks so you avoid unlawful full-payment timing; under the Construction Act, R.S.O. 1990, c. C.30 (s. 22–23), payers must retain a 10% holdback on services or materials actually supplied, even if your contract says payment on completion, and owners can face personal liability to lien claimants if the holdback was not properly kept.  Once liens that may be claimed against the holdback have expired or been satisfied, discharged, or otherwise provided for, the holdback becomes due, so paying everything immediately can put you at risk.  If you want to confirm what applies to your project, call (416) 906-6663 and speak with a paralegal at DK Legal Practice about your Ontario holdback obligations.

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Statutory Required Payment Holdbacks
Why It Is That Paying the Final Invoice In Full Upon Project Completion Is Actually Illegal

There are likely few times when paying an invoice in full is against the law.  Indeed, failing to pay an invoice in full is usually against the law by constituting as a breach of contract; however, in the realm of construction or renovation, meaning projects to improve a property, paying in full without retaining a holdback may be, and likely is, unlawful.

Note: Please contact DK Legal Practice by phone at: (416) 906-6663 to discuss any specific questions that you may have.

The Law

As per the Construction Act, R.S.O. 1990, c. 30, which prior to July 1 2018 was known as the Construction Lien Act, the owner of a project involving improvements to property, thus being any type of property including residential, commercial, industrial, agricultural, among other types, is statutorily required to holdback ten (10%) percent until the time within which a lien may be preserved expires.  Furthermore, where a project owner fails to properly holdback payment as statutorily required, the project owner may be held liable for payment to any and all subcontractors, subtrades, suppliers, among others, who were unpaid by the contractor or subcontractors along the chain of supply.  Specifically, the Construction Act states:


Holdbacks

Basic holdback

22 (1) Each payer upon a contract or subcontract under which a lien may arise shall retain a holdback equal to 10 per cent of the price of the services or materials as they are actually supplied under the contract or subcontract until all liens that may be claimed against the holdback have expired or been satisfied, discharged or otherwise provided for under this Act.

Separate holdback for finishing work

(2) Where the contract has been certified or declared to be substantially performed but services or materials remain to be supplied to complete the contract, the payer upon the contract, or a subcontract, under which a lien may arise shall retain, from the date certified or declared to be the date of substantial performance of the contract, a separate holdback equal to 10 per cent of the price of the remaining services or materials as they are actually supplied under the contract or subcontract, until all liens that may be claimed against the holdback have expired or been satisfied, discharged or otherwise provided for under this Act.

When obligation to retain applies

(3) The obligation to retain the holdbacks under subsections (1) and (2) applies irrespective of whether the contract or subcontract provides for partial payments or payment on completion.

Permissible forms of holdback

(4) Some or all of any holdbacks may, instead of being retained in the form of funds, be retained in one or more of the following forms:

1. A letter of credit in the prescribed form.

2. A demand-worded holdback repayment bond in the prescribed form.

3. Any other form that may be prescribed.

Personal liability

23 (1) Subject to subsections (2), (3) and (4), an owner is personally liable for holdbacks that the owner is required to retain under this Part to those lien claimants who have valid liens against the owner’s interest in the premises.

Limitation

(2) Where the defaulting payer is the contractor, the owner’s personal liability to a lien claimant or to a class of lien claimants as defined by section 79 does not exceed the holdbacks the owner is required to retain.

Same

(3) Where the defaulting payer is a subcontractor, the owner’s personal liability to a lien claimant or to a class of lien claimants as defined by section 79 does not exceed the lesser of,

(a) the holdbacks the owner is required to retain; and

(b) the holdbacks required to be retained by the contractor or a subcontractor from the lien claimant’s defaulting payer.

How determined

(4) The personal liability of an owner under this section may only be determined by an action under this Act.

As prescribed by the Construction Act, a ten (10%) percent holdback is statutorily required of each party involved in any property improvement project such as construction projects or renovation projects. Accordingly, the project owner must holdback ten (10%) percent from the full payment when paying the general contractor; and subsequently, the general contractor must then do the same when paying subcontractors, and so on throughout all levels within the labour and material supply chain involved with the project. Once the project is finished or once a Certificate of Substantial Performance is issued and the risk of a lien being placed upon the improved property expires, which is typically sixty (60) days afterward, the holdback requirement ends and payment of the holdback money becomes due.

Infrequent project owners as laypeople, such as homeowners, may be unaware that upon completion of a the project work, whether the project involves a pool installation, roofing shingle replacement, landscape upgrades, replacing kitchen cabinetry, basement wall waterproofing, or other improvements and renovations, that the ten (10%) percent holdback requirement is mandated by law. Failure to perform the statutory holdback constitutes as a breach of trust whereas the Construction Act creates a trusteeship and the failure to act in accordance with the trusteeship, the homeowner, among others, may be found liable for breach of trust.

Conclusion

Upon completion of a project to improve property or upon issuance of a Certificate of Substantial Completion, owners of projects, contractors, subcontractors, and anyone else involved in the supply chain, are required to holdback ten (10%) percent of the payment due for a period of sixty (60) days. After the sixty (60) days, presuming an absence of any liens registered against the property, the holdback provision expires and the holdback funds become payable.

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