Year-end WIP goes on the return
Unbilled work in progress is taxable income for an engineering firm, whether or not the milestone that triggers the invoice has been reached. The old billed-basis election under the Income Tax Act was limited to a short list of designated professions, engineers were not on it, and even that list saw the election phased out starting in 2017. So the T2 needs a defensible WIP valuation every year: generally the lower of cost and fair market value, where cost means the direct labour in each file plus a reasonable share of overhead.
Because we insist the valuation come from the project ledger rather than a spreadsheet built in March, the number is evidence, not guesswork. There is also one clean planning lever here: the fiscal year-end date itself. A firm whose major milestones bill in spring carries far less unbilled WIP into a year-end set just after those invoices go out than one that closes its year mid-project. We look at the billing rhythm before defaulting to December 31.
SR&ED is for firms that build, not for routine design
Here is the honest version: competent, difficult engineering is not enough. The SR&ED program excludes routine engineering, and a consulting assignment solved with established methods does not qualify no matter how demanding the client was. What does qualify is work that confronts technological uncertainty, and engineering firms generate more of it than they claim: an in-house analysis or simulation tool built because commercial software could not handle the problem, a monitoring device developed into a product, a process where existing approaches demonstrably failed and the team had to experiment.
When a claim is real, the money is significant for a CCPC:
| Credit | What it is worth |
|---|---|
| Federal SR&ED investment tax credit | 35% refundable for CCPCs on qualified spending within the expenditure limit |
| Ontario Innovation Tax Credit | 8% refundable |
| Ontario Research and Development Tax Credit | 3.5% non-refundable |
Two disciplines decide whether the claim survives. First, the T661 is due 12 months after the T2 filing deadline, effectively 18 months after year-end, with no extensions; a credit discovered later is simply lost. Second, contemporaneous records win reviews: hypotheses, test logs, commit history and time coded to the experimental work. We flag candidate projects during the year through Tax Planning & Advisory touchpoints so the paper trail exists before anyone drafts a claim.
HST at the client's rate, credits on every input
Engineering fees are fully taxable, which cuts both ways. On sales, the place-of-supply rules generally set the rate by the client's address: 13% for an Ontario client, 5% for an Alberta one, even though your seal and your office never left Mississauga. Firms that hard-code 13% into their invoicing template overcharge out-of-province clients and create refund headaches. Services supplied to non-resident clients can be zero-rated in some circumstances, a Canadian HST question worth professional attention before the first invoice, not after a CRA query.
On purchases, full taxability means full input tax credits: rent, software licences, subconsultants, equipment. Unlike an exempt medical practice, an engineering firm recovers its 13%, but only if the bookkeeping captures it, which is one more reason the HST return should be filed from reconciled books rather than bank totals.
The calendar, and the owner's return beside it
The recurring dates are unforgiving but predictable, and our Corporate Tax Filing service runs them as a system: the T2 due six months after year-end, the balance due three months after year-end for most CCPCs claiming the small business deduction, instalments once tax payable passes $3,000, T4 and T5 slips by the last day of February, and the GST/HST return on whatever filing frequency fits the firm's cash cycle. The first $500,000 of active income is taxed at roughly 12.2% combined in Ontario; keeping that rate is mostly a matter of filing clean and on time.
We prepare the owners' personal returns alongside the corporate file so salary, dividends and instalments tell one consistent story across the T2, the slips and the T1. And when a letter arrives, the ones that actually reach engineering firms are specific: an SR&ED technical review, a place-of-supply query on out-of-province invoices, a processing review of a large software or equipment addition. CRA Audit & Review Support answers from the working papers we already hold, and most letters end at the first reply.
Source: CRA — Scientific Research and Experimental Development (SR&ED) tax incentives.
