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Contractor accountant in Oshawa

Durham Region keeps building, from subdivisions in north Oshawa and Whitby to new streets in Courtice and Bowmanville, and the trades doing that work carry accounting problems a service business never meets. EverStone is an accountant for incorporated contractors and an Oshawa small business accountant, at fixed fees, online.

Quick answer: An Oshawa contractor has to account for the 10% holdback allowed under Ontario’s Construction Act, charge and remit 13% HST on progress draws as they are invoiced. It also has to file T5018 slips for payments to subcontractors, and keep WSIB coverage and clearance certificates in order. EverStone handles the books, those filings and the year-end T2 remotely, at a fixed fee agreed after a free consultation. Published fees start at $300 a month for bookkeeping and $100 for a personal return.

Building across Durham, and the work-in-progress question

Much of the construction work in Durham follows residential growth: framing, concrete, drywall, electrical, plumbing and finishing on new homes, plus the renovation and commercial work around them. That work runs in phases, and at any year-end a contractor usually has jobs half done, draws invoiced ahead of the work, or work done and not yet billed. Each of those changes what the year’s revenue actually was.

We review open jobs at the cut-off rather than taking revenue straight from the invoices or the bank. For a small trade that is a short conversation about three or four jobs. For a contractor running several builds it is a proper work-in-progress schedule, and it matters, because the year-end numbers are what the bank and the bonding company will read.

Equipment sits alongside the jobs. Excavators, skid steers, trailers and crew trucks are claimed through capital cost allowance over several years. An asset has to be available for use before year-end to be claimed at all, so a machine delivered in the first week of the new year belongs to the new year. When a contractor applies for a line of credit or a surety bond, the lender looks at the same statements; lender readiness covers what they tend to ask for, and CCA classes covers the equipment side.

The 10% holdback and when revenue is earned

Ontario’s Construction Act lets the payer on a contract retain 10% of each payment as a holdback until the lien period passes. For the contractor that is earned money not yet received. It belongs in the books as a separate holdback receivable, created when the progress invoice goes out and cleared when the holdback is released. Left out of the books, it distorts revenue and hides how much cash is locked in finished work.

On the payable side, a general contractor holding back from its own subcontractors records the mirror image: a holdback payable. Keeping both visible is what lets you see whether the business is financing its builders, or its subs are financing it. Construction holdbacks walks through the entries.

Progress billing, and when HST becomes payable

HST on a progress draw generally becomes payable when the invoice is issued or the payment is received, whichever comes first, not when the job is finished. A contractor that invoices a large draw at the end of a reporting period owes the HST on it that period, even if the builder pays next month. Holdbacks have their own rule: the HST on the retained amount generally becomes payable when the holdback is paid or falls due, rather than with the original invoice. Coding holdbacks separately is what lets the HST return get that right.

New-build residential work adds its own layer, in general terms. A builder who constructs or substantially renovates a home and sells or rents it can owe HST on the full value of the house under the self-supply rules. Buyers may be entitled to new housing rebates that the builder often credits at closing. A trade working for a builder charges HST on its own invoices in the ordinary way. Which side of that line your company sits on is worth settling before you price the job. The GST/HST hub covers the basics.

Subcontractors, T5018 slips and classification

A business whose main activity is construction reports payments to subcontractors for construction services on T5018 slips, due six months after the end of the reporting period. The information has to be collected when the sub is set up, not reconstructed from cheque stubs later. The T5018 subcontractor tracker keeps it in one place, and T5018 reporting explains who files.

The harder question is whether a regular sub is really a subcontractor. A helper who works only for you, on your schedule, with your tools, can look like an employee to the CRA, and a reassessment brings CPP, EI and penalties with it. We document the basis for each arrangement so it would stand up if examined; see subcontractor or employee.

WSIB and clearance certificates

WSIB coverage is compulsory for most construction businesses in Ontario, and in construction it can extend to independent operators and executive officers who would be optional in other industries. The hiring contractor also carries exposure for its subs: if a subcontractor is not in good standing, its premiums can land on you. The protection is a clearance certificate, pulled before work starts and again before each payment, and kept with the sub’s invoice. We build that check into the payables routine. If you run a crew of your own, payroll in Oshawa covers WSIB premiums alongside CRA remittances.

What EverStone handles for you

One CPA, one fixed fee agreed up front:

  • T2 corporate return and year-end financial statements
  • Holdbacks and work in progress reviewed at the cut-off
  • HST on progress draws and holdbacks coded and filed
  • T5018 subcontractor information returns
  • WSIB clearance checks kept with payables
  • Equipment and vehicle CCA schedules
  • Ontario Business Registry annual return

Fixed fees, fully online

EverStone is an Abbotsford CPA firm, and Oshawa runs on Eastern time, ahead of us, so your end of day lands in our afternoon. Everything runs by video, phone and secure upload, which fits a business run from a truck or a site trailer. A typical trades corporation bundle of bookkeeping, payroll and the year-end T2 usually runs $450 to $650 a month, and the fee is fixed before work starts. See what it costs.

About this article
EverStone CPA

Prepared and reviewed by a Chartered Professional Accountant at EverStone CPA, an Abbotsford CPA firm working with small businesses and incorporated contractors across the Fraser Valley and Canada. Updated September 2026. About the firm  ·  Book a free consult

What an Oshawa contractor has to get right

What an Oshawa contractor has to get right The items that decide an incorporated contractor’s year — for a business operating in Oshawa, Ontario
ItemWhy it matters
Holdback receivableEarned money not yet paid, recorded when the draw is invoiced
HST on progress drawsPayable when the invoice is issued or paid, not when the job ends
T5018 slipsDue six months after the reporting period for construction payments to subs
WSIB clearanceA sub not in good standing can pass its premiums to you
Sales tax where you operate13% HST, a single registration and a single return

Source: If you contract through a company. General information, not advice.

Other services for Oshawa businesses: personal tax.

Common questions

Oshawa accounting for construction contractors FAQ

Do Oshawa contractors file T5018 slips?+
If construction is your main business and you pay subcontractors for construction services, generally yes. The slips are due six months after the end of the reporting period, and we prepare them alongside the year-end. Ask about your case →
How do I record the 10% holdback?+
As a holdback receivable when the progress invoice is issued, cleared when the holdback is released. The revenue belongs to the period the work was done, even though the cash comes later.
When do I owe HST on a progress draw?+
Generally when you issue the invoice or receive payment, whichever is first. HST on a holdback is generally payable when the holdback is paid or becomes due.
Does WSIB apply to me as the owner?+
In construction it often does. Ontario makes coverage compulsory for most construction businesses, and that can reach independent operators and executive officers. Check your own status rather than assuming.
I build and sell a few houses a year. Is that different?+
Yes. A builder selling new homes deals with HST on the sale, possible self-supply rules and new housing rebates. It is a different file from a trade invoicing a builder, and worth a consultation before the next project starts.
Do you work with trades across Durham Region?+
Yes. EverStone works with contractors in Oshawa, Whitby, Ajax, Pickering and Clarington, and across Canada, entirely by video, phone and secure upload.
What does an accountant cost for an Oshawa construction business?+
Nothing about a Oshawa address changes the fee. Monthly bookkeeping starts from $300 a month and a personal return from $100; a corporate return is quoted after a free consultation. A single question can go to a 45-minute Advice Call, a flat fee of $200 + GST. Every fee is fixed in writing first. See the published fees.

Get a fixed quote for your Oshawa business

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A reply from a CPA within one business day, usually sooner — and a fee fixed in writing after a free consultation.

Contracting in Oshawa?

One CPA for your corporate tax, books and planning. Fixed fee, fully online. Book a free consult.

Remote contractor accounting from Abbotsford

Contractor accounting for Oshawa clients is delivered remotely from Abbotsford, British Columbia. There is no Oshawa office and no local team. Meetings are virtual, documents are signed electronically, and you deal with the CPA directly rather than an intake desk. Subcontractor payments, holdbacks and equipment costs are tracked as they happen rather than reconstructed at year end.

Talk to a CPA about this

One Chartered Professional Accountant, start to finish. Fixed fees, quoted in writing before any work begins, and no obligation from a first conversation.