AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
For a Canadian trades or construction business, AI agents are most useful on the paperwork that follows the work: tracking subcontractor payments for T5018 reporting, recording holdbacks and their release dates, sending invoices that meet prompt payment rules, and chasing what is overdue. Pricing, safety, site decisions and disputes stay with the owner.
Electricians, plumbers, renovators, roofers and general contractors run businesses where the admin happens at night, after the site work. Construction also has its own reporting and payment rules in Canada. This article looks at where AI agents fit in a trades business, using federal rules and Ontario as an example of provincial law. It is general information, not legal or tax advice.
T5018 reporting of subcontractor payments
Businesses whose main activity is construction generally have to report payments made to subcontractors for construction services on T5018 slips, or a summary listing, filed with the CRA. The CRA's guidance explains that reporting is not required for a subcontractor paid less than C$500 in the reporting period. The work is simple and easy to forget: keep each subcontractor's name, business number or other identifier, address, and the total paid for construction services.
An agent can hold a subcontractor register from the first payment, total payments through the year, flag subcontractors missing a business number, separate construction services from goods-only purchases, and draft the slips for review before the filing deadline.
Holdbacks and prompt payment
Provincial construction laws set rules on holdbacks and payment timelines. Ontario's Construction Act is one example. It requires a holdback, generally 10% of the value of the work, to be retained by each payer on the project, and it sets prompt payment timelines: broadly, an owner must pay a proper invoice within 28 days of receiving it unless it gives a notice of non-payment, and a contractor who is paid must then pay its subcontractors within set periods. Other provinces have their own rules, and several have introduced prompt payment laws of their own.
The rules reward good records. What an invoice must contain to count as proper, when it was given, when the holdback becomes due for release, and whether a notice of non-payment was received are all dates and documents. Agents are good at dates and documents.
| Item | What the agent tracks | Who decides |
|---|---|---|
| Proper invoice | Contents checklist, date delivered | Owner approves before sending |
| Payment clock | Days since delivery, due date | Owner chases or escalates |
| Notice of non-payment received | Date, amount disputed, reason | Owner, with legal advice |
| Holdback retained | Amount per project and release conditions | Owner releases or requests release |
| Subcontractor paid | Total for T5018, business number on file | Owner approves payments above limit |
Quotes, change orders and invoices
Most margin disputes in trades come from change orders that were agreed on site and never written down. An agent can turn a voice note or text from the site into a draft change order, send it to the client for written approval, and add the approved amount to the next invoice. It should not price the change itself. Pricing depends on materials, access, risk and how much you want the job, and that is your call.
For invoicing, an agent can apply the right GST/HST rate for where the work is done. Work on real property is generally taxed at the rate of the province where the property is located, which is a point the CRA's place-of-supply rules cover. It can attach photos and sign-off records so the invoice is harder to dispute.
Getting paid
Late payment is a constant in construction. An agent can send reminders on a schedule you set, in your wording, and stop as soon as a dispute is raised. Reminders are polite and dated; disputes are human. For the general method, read AI for accounts receivable.
A worked example
Example: a Hamilton renovation company of eight people runs four projects a month and uses five regular subcontractors. Its agent records each subcontractor payment, notices that one drywall subcontractor has no business number on file, and asks the office to collect it before the next payment. On a kitchen project worth C$80,000, it records the 10% holdback of C$8,000 retained by the homeowner and the expected release date, and reminds the owner a week before. When the homeowner disputes C$2,400 for a change to the cabinets, the agent finds the signed change order and the photos, puts them in front of the owner, and stops chasing that amount. The owner calls the client. In February the agent drafts the T5018 slips, the bookkeeper checks them, and the owner files.
What stays with the owner
- Pricing, quotes and change order values.
- Safety, site supervision and anything regulated by a licensing body.
- Notices of non-payment, liens and legal steps, which have strict deadlines and need advice.
- Whether a subcontractor is really a subcontractor or an employee.
- Every payment above the limit you set.
Where Pryme fits
Pryme Business includes invoicing and a Finance agent that releases payments only below your line and records each with its source. The Sales agent holds quotes, follow-ups and the promises made to win a job. Pryme accounts hold NGN, USD, GBP and EUR, not Canadian dollars, so they fit trades firms with cross-border work or suppliers rather than replacing a Canadian operating account. For startup set-up, see Canadian startup admin in the first 90 days.
Questions people ask
Who has to file T5018 slips?
Generally, businesses whose main source of income is construction must report payments to subcontractors for construction services. Payments under C$500 to a subcontractor in the period do not need to be reported.
What is a holdback?
A percentage of each payment retained under provincial construction law until set conditions are met. In Ontario the basic holdback is generally 10%.
Can an AI agent send notices under prompt payment law?
It can track deadlines and draft documents, but notices with legal effect should be reviewed and sent by a person, with advice where needed.
Can an agent price my quotes?
It can assemble materials lists and past job costs. The price itself should be your decision.
Sources
- T5018 slip: Statement of contract payments (Canada Revenue Agency) · accessed Oct 2026
- Construction Act, R.S.O. 1990, c. C.30 (Ontario e-Laws) · accessed Oct 2026
- GST/HST place-of-supply rules (Canada Revenue Agency) · accessed Oct 2026
- Keeping records (Canada Revenue Agency) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.