How to Apply for SR&ED Tax Credits in Canada

The short answer

SR&ED is a tax claim, not a grant application: you do the research and development work, document it as you go, and claim the credit with your tax return on Form T661. There is no intake window and no competition. The two facts that matter most are the three eligibility conditions — technological uncertainty, systematic investigation, technological advancement — and the deadline: 18 months after your tax year end for a corporation, with no extensions. Miss the deadline and the credit for that year is gone. This guide is the application walkthrough; for how SR&ED compares with US R&D support, see our Canada-versus-US guide linked below.

Step 1: Test the work against the three conditions

Before you spend anything on a claim, test each project against the CRA's eligibility framework. All three must be present:

1. Technological uncertainty. Whether a given result or objective can be achieved, or how to achieve it, is not known or determined on the basis of generally available scientific or technological knowledge. A competent professional in the field could not resolve it without experimentation. Routine engineering — applying known techniques to a known problem — does not count, even if the product is new to your business.
2. Systematic investigation. The work follows a structured, planned approach: hypotheses, experiments or analysis, carried out in an organized way. Stumbling on a solution does not count.
3. Technological advancement. The work generates or rules out new technical knowledge — an advancement in the underlying technology, not just a new application of existing knowledge to a business problem.

The work must also be performed in Canada, and it must fall into basic research, applied research or experimental development. Support work that directly contributes — engineering, design, operations research, mathematical analysis, computer programming, data collection and testing — can qualify alongside the core work.

What is excluded: market research or sales promotion; quality control or routine testing of materials, devices, products or processes; research in the social sciences or the humanities; prospecting, exploring or drilling for, or producing, minerals, petroleum or natural gas; the commercial production of a new or improved material, device or product, or the commercial use of a new or improved process; style changes; routine data collection; and training. If your project is mostly one of these, it is not a SR&ED project, and a claim will fail on technical review.

If you are unsure whether a project meets the definition before you file, the CRA offers an optional pre-claim review of whether your project meets the SR&ED definition. Ask your tax adviser whether it is worth it for your first claim.

Step 2: Document as you go

Contemporaneous documentation is a standing condition of a SR&ED claim, not a nice-to-have. The CRA expects technical records maintained throughout the project, and a claim rebuilt from memory at year-end is the most common reason a first claim fails or gets cut on review. Keep, for each project:

• The uncertainty, in writing: what was not known, and why standard practice could not answer it.
• The plan: hypotheses, experiments, test designs and decision points.
• The records: lab notebooks, test records, version control logs, meeting notes, design documents and project plans that show the systematic investigation.
• The time: timesheets for employees directly engaged in, or directly supporting, the SR&ED work.
• The money: payroll records, contractor invoices and receipts for materials used in the work.

Keep the records for the project as a whole, not just the successful parts: failed experiments are part of the investigation, and the advancement can be a ruled-out path. The CRA's technical review is done by a Research and Technology Advisor, who reads the project description against these records; the financial review is separate and checks that the expenditures are directly attributable and correctly calculated.

Step 3: Complete Form T661

Form T661, the SR&ED Expenditures Claim, is the document that carries the claim. It produces three amounts: allowable expenditures, the pool of deductible expenditures, and qualified SR&ED expenditures for investment tax credits. Use Guide T4088, the Guide to Form T661, to fill it out.

• Part 1 aggregates the tax year's expenditures: salaries and wages for employees directly engaged in SR&ED, materials, and payments to arm's-length third parties for SR&ED performed on your behalf — 80% of an arm's-length contractor payment is eligible.
• Overhead can be traced directly (the traditional method) or claimed by the proxy method: 55% of the salary base. Most claimants use the proxy method.
• Part 2 is the technical description, one per project, and it is the part the CRA reviews first. It asks three questions, each with a word limit: the scientific or technological uncertainties you attempted to overcome (line 242), the work you performed (line 244), and the advancements you achieved (line 246). Write them in the technical lead's words, project by project — two to four pages per project is a realistic length — and answer the five eligibility questions the CRA uses: what was the uncertainty, what was the hypothesis, what was the systematic investigation, what was the advancement, and what records were kept.
• Part 9 requires you to disclose the claim preparer and the fee arrangement, including whether it is contingency-based. If a preparer worked on contingency, say so: non-disclosure is a compliance problem of its own.

Note that Form T661 has been updated to incorporate the legislative changes enacted through Bill C-15 (royal assent March 26, 2026), and Guide T4088 is currently being revised. In the interim, the CRA directs claimants to its SR&ED news and updates page for the new line numbers on Form T661. Use the current "(26)" version of the form.

Step 4: Calculate the credit on Schedule T2SCH31

The totals from Form T661 flow into the credit calculation:

• Corporations attach Form T661 to the T2 return along with Schedule T2SCH31 (Investment Tax Credit — Corporations), which calculates the investment tax credit.
• Individuals use Form T2038(IND) with the personal return.

The rates, for tax years beginning after December 15, 2024:

• Canadian-controlled private corporations (CCPCs) earn a 35% refundable credit on qualifying expenditures up to a $6,000,000 expenditure limit — a maximum of $2,100,000 of enhanced credit per year — and 15% non-refundable above that. Refundable means it is paid in cash even if the corporation owes no tax. The enhanced limit phases out on taxable income and taxable capital, so confirm your corporation's position.
• Eligible Canadian public corporations can also earn the enhanced 35% refundable credit for tax years beginning after December 15, 2024, subject to eligibility conditions.
• Other corporations, individuals and partnerships generally earn the basic 15% non-refundable credit, which reduces tax payable rather than being paid out in cash.

Credits can generally be carried back three years and forward twenty years where they are non-refundable. Provincial R&D credits can be claimed in addition to the federal credit — check your province's program separately, as rates and forms differ.

Step 5: File with your return before the deadline

File Form T661 with your income tax return. The timing:

The deadline is 12 months after the filing due date of the return — 18 months after the tax year end for a corporation, 17.5 months for an individual — and it is absolute. The CRA cannot by law allow additional time, and there is no appeal for a late claim. Filing with the return, rather than at month 17, is the fastest route to a refund: complete claims not selected for review are typically processed within about 60 days, while claims selected for technical or financial review take longer. Put the deadline in the calendar when the fiscal year starts, not when the return is due.

After filing, keep the records. First-time claims and large claims are the most likely to be selected for review, and the review will ask for the contemporaneous documentation from Step 2.

The companion program: NRC IRAP

SR&ED pays for work already done. NRC IRAP (the National Research Council's Industrial Research Assistance Program) is the other federal door: non-repayable contributions for technology R&D projects, applied for in advance through an Industrial Technology Advisor, for incorporated Canadian SMEs with fewer than 500 full-time employees. CanExport SMEs, covered in our export funding guide, is delivered in partnership with NRC IRAP. If your R&D has an export market, check both doors — but apply to IRAP before the work starts, and claim SR&ED after it is done. No IRAP funding amounts are stated here: the program's streams and amounts changed in 2026, and no figure could be verified on an official page.

Figures we did not include, and why

No IRAP contribution amounts are given, for the reason above. No processing-time figure beyond the commonly reported 60 days for complete unreviewed claims is stated as a guarantee — review selection extends timing, and the CRA's own service standard is the figure to check at filing time. The 35% rate, the $6,000,000 limit and the 18-month deadline are stated because they are published by the CRA; confirm the phase-outs on taxable income and taxable capital for your corporation with your tax adviser before relying on the enhanced rate.

This guide is process information, not tax advice. SR&ED eligibility turns on the facts of your work — have your tax adviser or SR&ED preparer review the claim before you file. Figures are current as of November 2026.

Related guides

• SR&ED and IRAP vs US R&D support — the comparison companion: how the Canadian credit and contribution routes stack up against the US research credit and SBIR/STTR funding.
• How to apply for CanExport SMEs funding in Canada — the export funding companion: CanExport SMEs is delivered in partnership with NRC IRAP, and is closed for 2026-27.
• How to get a small business loan in Canada — the financing companion: term loans for the equipment and working capital around an R&D project.
• How to get a business line of credit in Canada — the cash-flow companion: bridging the gap between spending on R&D and receiving the credit.
• How to start using ResearchNet for federal research funding in Canada — the research funding companion: the portal for federal research grants.
• How to start using the NSERC Research Portal in Canada — the academic companion: NSERC funding for research partnerships with universities.

Sources

• T4088, Guide to Form T661, Scientific Research and Experimental Development (SR&ED) Expenditures Claim (Canada Revenue Agency) — how to complete Form T661, project definition, Bill C-15 updates and the guide revision notice.
• Scientific Research and Experimental Development (SR&ED) Expenditures Claim, Form T661 (Canada Revenue Agency) — the claim form itself: 12-months-after-due-date filing rule, Part 2 project questions, T2SCH31 and T2038(IND) routes.
• CanExport SMEs 2026-2027: complete applicant's guide (Trade Commissioner Service) — CanExport SMEs delivered by Global Affairs Canada in partnership with NRC IRAP.