Saskatchewan amended its Builders’ Lien Act (SS 1984-85-86 c.B-7.1) with prompt-payment rules that came into force on March 1, 2022. That made Saskatchewan the first prairie province to go live with a statutory payment clock, ahead of Alberta (August 2022) and Manitoba (April 2024). The changes added three things that did not previously exist in Saskatchewan construction law: a mandatory 28-day payment deadline, a downstream passthrough requirement, and a statutory adjudication mechanism under Bill 24.
The lien rules were already in place under the existing Act. The prompt-payment amendments layered on top of them. This guide covers both together, because missing either deadline has serious consequences.
For comparison with other western provinces, see the Alberta PPCLA guide and the BC Prompt Payment Act guide. For Ontario’s Construction Act, see the Ontario guide.
The 28/14/7-day payment timeline
When you deliver a proper invoice, a fixed calendar-day sequence begins. All days are calendar days, not business days. The sequence applies to every tier in the contracting chain.
The 14-day notice of non-payment is the step most contractors miss. If an owner simply does not pay and does not issue a notice, the full invoice amount is due at day 28 regardless. That puts you in a strong position to refer the dispute to adjudication immediately.
What is a “proper invoice” in Saskatchewan?
The prompt-payment amendments define what a proper invoice must contain. Only a proper invoice starts the 28-day clock. An invoice that is missing required elements gives the payer grounds to refuse payment without starting the clock.
A proper invoice in Saskatchewan must include, at minimum:
- The contractor’s name and business address.
- The date of the invoice.
- The period of work or supply covered by the invoice.
- A description of the services performed or materials supplied and the amount payable for each.
- The name and contact information of the person to whom payment is to be sent.
- The payment terms.
- GST and PST shown as separate line items (see the tax section below).
Most invoicing tools built outside Canada omit the period-of-work field and the payment-recipient details. An invoice missing either field is not a proper invoice under the Act. The 28-day clock does not start, and you have no prompt-payment rights until a compliant invoice is delivered.
Lien preservation: 40 days (s.49), the shortest in the prairies
Under section 49 of the Builders’ Lien Act, you have 40 days from the last day of work or supply under your contract to register (preserve) your lien. That is the shortest preservation window of the three prairie provinces:
- Saskatchewan: 40 days (s.49)
- Alberta: 60 days (s.41 PPCLA)
- Manitoba: 60 days (s.43 as amended April 1, 2024)
The trigger is the last day you personally performed work or supplied materials under your contract. If you are a subcontractor, it is your last day of supply, not the head contractor’s. Do not rely on the head contractor’s timeline to protect your own deadline.
After preservation, you must file a statement of claim within 2 years of registration to perfect the lien. Missing the perfection deadline extinguishes the lien even if preservation was timely.
Saskatchewan courts apply the lien preservation deadline strictly. There is no equitable extension. Waiting until payment is refused or disputed does not pause the clock. The 40 days run from the last day of your work or supply regardless of whether you have been paid. Track every project’s last-supply date from day one. Use the free lien-deadline calculator to track the SK 40-day clock automatically.
Statutory holdback: 10% on contracts $50,000 and over
Saskatchewan’s statutory holdback is 10% of each progress payment, but only on construction contracts with a total value of $50,000 or more. Contracts below $50,000 do not trigger the statutory holdback obligation. This threshold differs from Ontario and BC, which apply holdback to all contracts.
Holdback must be retained until the conditions for release are met under the Act. Paying it out early on a qualifying contract can expose the owner or general contractor to personal liability for unpaid downstream parties who have a lien right against the holdback fund. If you are a subcontractor on a large project, confirm that holdback is being properly retained above you in the chain.
Tax on Saskatchewan construction invoices: GST + PST = 11%
Construction work in Saskatchewan attracts two taxes that must both appear on a compliant invoice:
- 5% federal GST , standard across all provinces.
- 6% Saskatchewan PST , applied to taxable construction services and tangible goods.
The combined rate is 11%. Both taxes are calculated on the pre-tax base amount. Show them as separate line items on every invoice.
Out-of-province vendors: no PST small-supplier threshold
A critical detail that catches many out-of-province contractors off guard: Saskatchewan PST has no commercial small-supplier threshold for vendors selling tangible goods or taxable services into the province. Under federal GST rules, businesses below $30,000 in annual revenue can avoid registering. SK PST has no equivalent floor for these categories. If you are based in another province and doing construction work or supplying materials in Saskatchewan, you must register for and collect SK PST regardless of how small your Saskatchewan revenue is.
Confirm your specific PST registration obligations with the Saskatchewan Ministry of Finance or a tax advisor before invoicing SK clients.
Statutory adjudication (Bill 24)
Bill 24 added a statutory adjudication mechanism to the Builders’ Lien Act. When payment is withheld in breach of the prompt-payment rules, either party can refer the dispute to an adjudicator appointed through a designated nominating authority instead of going to court.
How adjudication works in Saskatchewan:
- Either party submits a notice of adjudication to the designated nominating authority and identifies the dispute.
- An adjudicator is appointed within a short window and receives the materials from both parties.
- The adjudicator issues a determination. The determination is interim-binding: it must be paid even if either party later challenges it in court or arbitration.
- Payment of the adjudicated amount is due within the timeline set by the adjudicator’s order.
Adjudication is designed to be faster and cheaper than litigation for payment disputes. Because the determination is interim-binding, a payer cannot stall a contractor by threatening a lengthy court fight, the adjudicated amount is payable regardless. You can dispute the outcome later, but you must pay first.
Adjudication does not replace lien rights. You can pursue adjudication and preserve a lien at the same time. In practice, adjudication resolves most payment disputes without a lien ever being enforced.
Saskatchewan vs Ontario: key differences
If you have worked under Ontario’s Construction Act or read about it, here is how Saskatchewan compares. The payment clock is identical; the lien and holdback rules differ meaningfully.
The 40-day lien preservation window is the most important difference to internalize. If you are used to Ontario’s 60 days, operating in Saskatchewan with the same mental model can cost you 20 days you do not have.
Related provincial guides and tools
- Alberta Prompt Payment and Construction Lien Act , in force August 29, 2022, 60-day lien window, 5% GST only.
- Manitoba Prompt Payment and Builders’ Liens , in force April 1, 2024, 60-day lien window (extended from 40 days by Bill 38).
- BC Construction Prompt Payment Act , Royal Assent November 27, 2025, staged rollout in 2026.
- Ontario Construction Act , in force October 1, 2019, 60-day lien window, ODACC adjudication, 13% HST.
- Lien deadline by province: Canada-wide comparison , side-by-side summary of all provincial windows.
- Free lien-deadline calculator , enter your last-supply date and province to get the exact preservation deadline.
Practical checklist for Saskatchewan contractors
- Audit your invoice template. It must include: contractor name and address, invoice date, period of work, description and amount for each line item, payment recipient’s name and contact information, payment terms, and GST and PST as separate line items.
- Track the last-supply date for every project from day one, not from when payment problems start. The 40-day clock runs whether you know about it or not.
- If you are based outside Saskatchewan and doing work or supplying materials there, confirm your SK PST registration obligations before invoicing. There is no small-supplier threshold for tangible goods and taxable services.
- On contracts $50,000 and over, confirm the owner or GC is retaining 10% holdback on every progress payment. If you are the GC, retain holdback from your subcontractors before paying them.
- If a payment is late and the owner has not issued a notice of non-payment by day 14, document that gap. The full invoice amount is due at day 28 and you are in a strong position for adjudication.
- Do not confuse adjudication with lien rights. You can and should preserve a lien on the 40-day clock even if you are also pursuing adjudication.
Sources
- Builders’ Lien Act, SS 1984-85-86 c.B-7.1 (as amended by Builders’ Lien (Prompt Payment) Amendment Act, 2019): canlii.org
- Government of Saskatchewan, Builders’ Lien Act information: saskatchewan.ca
- Markup lien engine, internal cross-reference:
src/lib/lien/index.ts(SK: 40-day preservation window confirmed against s.49)