How Much Is Your R&D Worth?
Calculate Your SR&ED Tax Credit

How to calculate your SR&ED (SRED) tax credit by hand

What actually counts as SR&ED work

SR&ED work means systematic investigation into a technological uncertainty, not routine coding, styling, or configuration changes.

Here is what you need to know: eligible work falls into three categories: basic research, applied research, and experimental development. Most claimants are in the third category, meaning they were building or improving a product, process, or material and ran into a technological uncertainty along the way. Routine debugging, styling changes, and standard configuration work do not qualify on their own. The CRA processes roughly 22,738 SR&ED claims a year across every eligible industry, approving about $4.5 billion in investment tax credits, so the program is large, but each individual claim still lives or dies on that same technological-uncertainty test. Unlike a routine product update, which follows known engineering practice from start to finish, eligible SR&ED work follows a path where the outcome genuinely could not be predicted in advance from standard practice or publicly available knowledge.

In short: SR&ED protects work that involved genuine technical risk and was investigated systematically. Routine engineering and styling work do not qualify, no matter how novel the finished product feels to the market.

SR&ED eligible expenses: what counts and what does not

Proxy vs traditional overhead: which method is right for you

The proxy method adds 55% of qualifying salaries automatically, with no receipts; the traditional method requires itemizing overhead.

Overhead, meaning the indirect costs of running your R&D such as rent, utilities, and administrative support, is eligible alongside salaries, materials, and subcontractors. You choose one of two methods to calculate it, and you can only use one per fiscal year. To use the traditional method, you itemize every eligible overhead line item, rent, utilities, and administrative support tied directly to R&D space and time, since the deemed 55% proxy figure does not apply once you switch.

CCPC enhanced rate, Budget 2025, and your province

A CCPC claims the enhanced 35% SR&ED rate on the first $6 million of spending, refundable as cash even with no tax owing.

Company type is the single biggest lever in your SR&ED credit. A CCPC, a Canadian-controlled private corporation, is a private company controlled by Canadian residents and not listed on any stock exchange; control, not ownership percentage, decides the test, so a company with meaningful foreign investment can still qualify if no single foreign party controls it. A CCPC gets the enhanced 35% rate on the first $6 million of its pool, fully refundable as cash even with no tax owing, capped at $2.1 million a year. A non-CCPC gets 15% on the whole pool, and it is non-refundable, meaning it only reduces tax you already owe; the exception is an eligible Canadian public corporation, which can earn the 35% rate for tax years that begin after December 15, 2024. For an eligible CCPC, SR&ED is a Stack Floor program. The Stack Floor is the funding a qualified applicant can count on before any competitive program: entitlement-style tax credits and guaranteed-access financing that pay every eligible claim. If the work qualifies, the credit pays.

Yes, pre-revenue companies can claim SR&ED

SR&ED does not require taxable income. Pre-revenue CCPCs are among the best-positioned claimants because the enhanced 35% rate is fully refundable as cash, not just a deduction against tax owed. A pre-revenue startup spending $200,000 on eligible R&D can receive roughly $70,000 in cash from the CRA even while it owes zero corporate tax. The eligibility requirements are the same as for any claimant: the work must involve genuine technological uncertainty, follow a systematic investigation, and be documented as it happens rather than reconstructed later. Because SR&ED is a Stack Floor program rather than a competitive grant, eligibility rests entirely on the technical work itself, not on revenue, headcount, or how many other companies applied in the same funding round. Many early-stage founders skip SR&ED because they assume credits require taxable income; for a CCPC, they do not.

Your province adds a second credit on top

The federal credit is the floor, not the ceiling. Provincial R&D tax credits stack on top of the federal amount, and the five programs this calculator computes are shown below at the rate it uses. British Columbia, New Brunswick, Nova Scotia, Newfoundland and Labrador and Yukon run their own credit too: every rate is on the map below.

SR&ED rates by province: the five this calculator adds, and the rest

What you’ll actually file

SR&ED claims are filed on Form T661 with Schedule T2SCH31, due within 18 months of your fiscal year end with no exceptions.

Estimating your credit is the easy part. Filing it correctly, and on time, is what actually gets you paid. Filing early, once your accountant has already finished the T2 corporate return, gives your technical team more runway to draft the Part 2 narrative properly; waiting until month sixteen or seventeen of the eighteen-month window to reconstruct a year-old technical story is the most common reason claims arrive rushed and weak.

1. Track your R&D as you go. Timesheets separating R&D from non-R&D hours, technical notes, and test results, kept contemporaneously rather than reconstructed later.
2. Complete Form T661. The technical narrative in Part 2 is the most scrutinized section, and Part 3 is where you choose the proxy or traditional overhead method. Our T661 form guide walks through it line by line.
3. File Schedule T2SCH31 with your corporate return, within 18 months of your fiscal year end. This deadline is absolute; there are no extensions.
4. Add your provincial form if your province has its own filing requirement alongside the federal claim.

In short: the credit is only as strong as the paperwork behind it. File Form T661 and Schedule T2SCH31 within 18 months, and keep documentation contemporaneous so the technical narrative holds up if CRA reviews it.

When does the SR&ED refund arrive? Your dates from your year-end

Where estimates and reality diverge

A calculator estimates your eligible SR&ED pool; only the Form T661 technical narrative decides whether CRA accepts the claim.

A calculator can only estimate your eligible pool. Here is where claimants most often get a smaller, or larger, credit than they expected. A technological uncertainty, the deciding definition CRA applies, means a problem whose solution could not be determined in advance from generally available knowledge or standard practice in the field; a calculator cannot judge that, only a written technical narrative can.

• Reality: CCPC status depends on control, not ownership percentage. A company with significant foreign ownership can still be a CCPC if no single foreign party controls it, and the 35% vs 15% difference on $1M is $200,000.
• Reality: only 80% of arm’s-length subcontractor payments are eligible. Pay a subcontractor $100,000 and only $80,000 enters the pool.
• Reality: other government funding on the same project, such as IRAP, reduces your SR&ED-eligible pool dollar-for-dollar. $200,000 of IRAP funding on a $500,000 project leaves only $300,000 eligible for SR&ED.
• Reality: the 18-month filing deadline has no exceptions. First-time filers are also more commonly selected for CRA review, so build in time for that possibility.

What triggers a CRA review

CRA reviews an SR&ED claim in one of two ways: a financial review, checking whether the expenditure calculations and eligible costs are correct, or a technical review, evaluating whether the work meets the three-part SR&ED test. Many claims get both. First-time filers and unusually large claims are reviewed more often than routine, well-documented repeat claims. The biggest single trigger reviewers flag is after-the-fact documentation: timesheets, technical notes, and test results written up weeks or months after the work happened instead of during it. A claim built on contemporaneous project logs, dated hypotheses, and recorded results moves through review faster and survives technical scrutiny more often than one reconstructed from memory at filing time. Respond to every CRA request promptly; its service standards (60 calendar days for a claim accepted as filed, 180 for a refundable claim selected for review) do not count time lost to an unanswered request.

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