Key takeaway: SR&ED provincial tax credits stack with the federal 35% rate, but the real combined number in every province is lower than the naive sum most founders do in their head. Ontario and Alberta's base tier land around 40.2%, British Columbia around 41.5%, and Quebec's richest tier around 54.5% — a spread of nearly 20 percentage points between Quebec and a company with no provincial credit at all. On an illustrative $500,000 SR&ED claim, that spread is worth roughly $97,500. None of it is optional information: which province your R&D work is actually performed in changes your refund more than almost any other variable in the program.
Every province quotes its SR&ED credit as a clean percentage, and every founder does the same math: add it to the federal 35% and call that the refund rate. Ontario says 8%, so the claim must be 43%. British Columbia says 10%, so it must be 45%. Quebec says up to 30%, so surely that's 65%.
None of those numbers are what actually lands in your bank account. Here's what each province's SR&ED tax credit is actually worth once it's combined correctly with the federal rate, how the four provinces with a credit compare to each other, what happens if you operate in more than one, and when — if ever — it's worth doing anything differently because of where your R&D work happens.
How SR&ED provincial tax credits stack with the federal rate
SR&ED provincial tax credits don't add on top of the federal 35% rate — they're subtracted from your expenditure base first, which shrinks the amount the federal credit is calculated on. The real combined rate ends up several percentage points lower than the naive sum of the two headline numbers, in every province that has a credit.
This isn't a quirk of one province's rules; it's federal law. Per the CRA's Assistance and Contract Payments Policy, a provincial or territorial R&D tax credit counts as government assistance under subsection 127(18) of the Income Tax Act, and government assistance reduces both the pool of deductible SR&ED expenditures and the qualified expenditures used to calculate your federal credit — "regardless of whether the credit is refundable or non-refundable." We've written the full mechanics of this — the "grind" — in a dedicated post; this one is about what the grind means for comparing province to province, so you can tell which numbers below are the real ones.
One consequence worth stating plainly: whether the credit is refundable doesn't change whether it grinds the federal base. Ontario's non-refundable ORDTC grinds the base the same way its refundable OITC does. There's no version of "claim the provincial credit and keep the full federal rate too" — the subtraction happens either way.
SR&ED tax credits by province, compared
Four provinces run a general R&D tax credit on top of the federal SR&ED program: Ontario, British Columbia, Quebec, and Alberta. Three jurisdictions — the Northwest Territories, Nunavut, and Prince Edward Island — have no provincial R&D credit at all, so a company operating only there claims the federal rate on its own, with nothing to grind.
Here's each province's credit and its real combined rate, using the same illustrative math throughout — provincial rate applied first, federal 35% applied to what's left. Treat the combined numbers as directional: your actual blended rate depends on your expenditure mix, whether you use the proxy method, and where your spend sits relative to each province's own expenditure limit.
- Ontario: the Ontario Innovation Tax Credit pays 8%, refundable, on the first $3 million of eligible spend (its own limit — it didn't move when the federal limit doubled to $6 million). Combined with the federal rate: about 40.2%, not the naive 43%. Ontario also runs a second credit, the ORDTC, at 3.5% non-refundable with a 20-year carryforward, for companies that don't fit the OITC. Full breakdown: our Ontario post and the Ontario landing page.
- British Columbia: the BC SR&ED credit pays 10%, refundable for CCPCs and, since BC Budget 2026, for eligible Canadian public corporations (ECPCs) too — and it now runs up to the full $6 million federal expenditure limit and is permanent. Combined: about 41.5%, not 45%. A 10% non-refundable version exists above the refundable claim, open to all qualifying corporations. Full breakdown: our BC post and the BC landing page.
- Quebec: the CRIC is refundable at 30% on the first $1 million of eligible spend above an exclusion threshold, dropping to 20% above that. Combined: about 54.5% on the first tier, about 48% on the second — not the naive 65% or 55%. The exclusion threshold itself is pro-rated to time actually spent on eligible work, so it shifts company to company. Full breakdown: our Quebec post and the Quebec landing page.
- Alberta: the Innovation Employment Grant pays 8% up to a company's base spend level and 20% above it, on up to $4 million of annual R&D spend. Combined: about 40.2% at the base tier (same math as Ontario's), about 48% above it — not 43% or 55%. Full breakdown: our Alberta post and the Alberta landing page.
- NWT, Nunavut, and PEI: no provincial R&D credit, so nothing to grind — a company spending only in these jurisdictions claims the federal rate straight, whichever rate it qualifies for.
Which province has the highest combined SR&ED rate
Quebec's first tier, at a combined rate of about 54.5%, is the richest number of any province — but it only applies to the first $1 million of eligible spend above an exclusion threshold, and it drops to about 48% above that. Ontario and Alberta's base tiers land closest together, at about 40.2% each, with British Columbia just ahead at 41.5%.
That ranking holds for the illustrative math above, but it isn't the whole picture for every company. A company spending well past Quebec's $1 million first tier is doing most of its incremental spend at the 48% second-tier rate — closer to Alberta's above-base number than to Quebec's headline. And a company past Ontario's $3 million OITC limit or Alberta's $4 million IEG limit is doing its marginal spend at the federal rate alone, 35%, with no provincial top-up at all. The province with the "best" number on paper isn't necessarily the best number for your actual spend level — read the limit, not just the rate.
Run the same $2 million of eligible salaries through each province and the gap becomes concrete instead of abstract:
- Ontario, first $2M (under the $3M OITC limit): OITC pays $160,000; federal 35% applies to the remaining $1.84M for $644,000. Total: $804,000, about 40.2%.
- British Columbia, full $2M (under its own limit): provincial credit pays $200,000; federal 35% applies to the remaining $1.8M for $630,000. Total: $830,000, about 41.5%.
- Quebec, first $1M at 30% then $1M at 20%: first tier pays $300,000 with federal 35% on the remaining $700,000 ($245,000); second tier pays $200,000 with federal 35% on the remaining $800,000 ($280,000). Total: $1,025,000, a blended rate of about 51.25% across the full $2 million.
- Alberta, first $2M split at its base/above-base threshold: the exact split depends on your company's base spend level, so this one can't be reduced to a single blended number without that figure — the 40.2% and 48% tiers from the section above still apply to the relevant portion of spend.
- No provincial credit (NWT, Nunavut, PEI): federal 35% on the full $2M, flat: $700,000.
The spread between the richest illustrative outcome (Quebec, about $1.025M) and no provincial credit at all ($700,000) is $325,000 on the same $2 million of spend — real money, and the reason "which province is my R&D actually performed in" is worth getting right on the claim, not an afterthought.
How you actually file each province's credit
Filing a provincial SR&ED credit means adding a provincial form or schedule to your federal claim — it's an addition to the T661 and Schedule T2SCH31 filing, not a replacement for it. The specifics vary by province, and getting the provincial piece wrong doesn't touch your federal credit, but it does mean leaving that province's money unclaimed.
British Columbia's mechanics are the most precisely documented: the credit is filed on Form T666 alongside your T2, with the refundable amount reported on Schedule 5, line 674 and the non-refundable amount on line 659. Quebec's CRIC uses its own fillable form, RD-1029.8.CR-T, filed with Revenu Québec rather than the CRA — a genuinely separate filing step, though the underlying eligibility test is harmonized with the federal rules and the CRA carries out the scientific review either way. Ontario and Alberta's credits are claimed on your provincial corporate tax return, filed alongside — not instead of — your federal T661; check with whoever prepares that return that they're claiming it, since it doesn't happen automatically just because your federal SR&ED claim was filed.
The common failure mode isn't a rejected provincial claim — it's a provincial credit nobody remembered to file for at all, because the federal claim absorbed all the attention and the provincial form was a separate, easy-to-miss step on a separate return.
What if your company operates in more than one province
A company with a permanent establishment in more than one province claims each province's credit only on the SR&ED work actually performed there. A Vancouver-based company with a Toronto satellite office can't apply BC's 10% to salaries paid to the Toronto team. Except for Quebec, claiming a provincial credit requires a permanent establishment in the province where the R&D is performed.
Quebec is the genuine exception worth knowing about: it doesn't require a Quebec permanent establishment to claim the CRIC, unlike every other province with a credit. That matters for planning where new hires or new offices land, though it shouldn't be the deciding factor on its own — see the next section.
For most multi-province companies in practice, this means splitting the claim: expenditures tied to the team working in each province get that province's credit and that province's grind, calculated separately, then combined into the total federal claim. It's more bookkeeping, not a different program — the SR&ED guide covers how the pieces fit together at the federal level regardless of how many provinces are involved.
Should you relocate or renounce to chase a better rate
No — relocating a permanent establishment to capture a richer provincial credit almost never pencils out once you account for the real cost of actually operating somewhere else, and it's not something we'd recommend to a company making the decision on tax math alone. The provincial credit is calculated on real R&D salaries; moving a team costs real money and real disruption, and the percentage-point gap between provinces (roughly 40% to 54.5%) is smaller than what most relocations cost in the first year alone.
Renouncing a provincial credit is a related but separate question, and here the answer from our own modeling is consistent across provinces: a claimant can renounce a provincial R&D credit by the return's filing-due date, and if you do, no reduction applies to your federal qualified expenditures for that credit. Run the arithmetic, though: renouncing Ontario's 8% OITC to protect your federal base trades a real $40,000 credit (on $500,000 of spend) for a federal-side gain of about $14,000 (35% of the amount that would otherwise have come off the base). You give up $40,000 to gain $14,000. In every scenario we've modeled, claiming the provincial credit and living with the grind beats renouncing it — the honest exception is a credit so small relative to the paperwork (an extra provincial return, a permanent-establishment determination) that it genuinely isn't worth filing for, which is rare above a few thousand dollars of expenditure.
If your company genuinely operates only in a province with no credit — NWT, Nunavut, or PEI — none of this changes your decision-making at all. You claim the federal rate, it's real money, and there's no provincial layer to model.
Tracking which province each R&D dollar belongs to is its own bookkeeping problem, on top of the federal eligibility test. It degrades fast when it's reconstructed at filing time instead of captured as the work happens. That's the operational problem Glauq is built around: the evidence — including which team, and which province, did which piece of work — gets documented continuously inside the tools your engineers already use, and a qualified independent SR&ED expert reviews the claim, provincial splits included, before it's filed and stands behind it if the CRA has questions. Automation handles the tracking across provinces; the accountability for what gets filed still sits with a named person, not a script.
Frequently asked questions
Do SR&ED provincial tax credits add directly to the federal 35% rate? No. Under subsection 127(18) of the Income Tax Act, a provincial R&D credit is government assistance and reduces the expenditure base the federal 35% is calculated on. The real combined rate is a few points lower than the sum of the two headline percentages in every province — see the grind rule breakdown for the mechanism.
Which province has the best SR&ED tax credit? Quebec's first-tier CRIC produces the richest illustrative combined rate, about 54.5%, on the first $1 million of eligible spend above its exclusion threshold, dropping to about 48% above that. Ontario and Alberta's base tiers land around 40.2%, and British Columbia around 41.5%. Which is "best" for your company depends on your actual spend level relative to each province's own expenditure limit, not just the headline rate.
Can I claim more than one province's SR&ED credit? Only if you have R&D work performed in more than one province with a permanent establishment there — you claim each province's credit on the expenditures tied to the work actually done in that province. Quebec is the one province that doesn't require a permanent establishment to claim its credit; every other province with a credit does.
Do the Northwest Territories, Nunavut, and Prince Edward Island have an SR&ED credit? No. Per the CRA's provincial and territorial credits page, those three jurisdictions have no general R&D tax credit. A company operating only there claims the federal SR&ED rate on its own, with no provincial credit and no grind to calculate.
Should I move my company to a province with a richer SR&ED credit? No. The real gap between provinces (roughly 40% to 54.5% combined, before accounting for each province's own expenditure limit) is smaller than what relocating a team typically costs, and the decision has far more variables than tax credits alone. This is our read based on the math, not a claim that relocation never makes sense for other business reasons.
Does it matter whether a provincial credit is refundable or non-refundable? Not for whether it grinds the federal base — the CRA's policy states the reduction applies "regardless of whether the credit is refundable or non-refundable." It matters for your cash flow: a refundable credit like Ontario's OITC or BC's credit pays out even with no tax owing, while a non-refundable one like the ORDTC only reduces tax payable.
See what your company's combined federal and provincial credit could actually be worth — estimate your refund or check your eligibility.