SR&ED Tax Credit Guide: Claim R&D Expenses in Canada
The Scientific Research and Experimental Development (SR&ED) program is Canada's largest federal tax incentive for research and development, providing over $4 billion in tax credits annually. This guide covers everything you need to know to prepare and file a successful claim.
In this guide
What Is the SR&ED Tax Credit?
The Scientific Research and Experimental Development (SR&ED)program is a federal tax incentive administered by the Canada Revenue Agency (CRA) that encourages businesses of all sizes to conduct research and development (R&D) in Canada. It is the single largest source of federal support for industrial R&D.
Unlike grants, SR&ED is a tax credit— you earn it by conducting eligible R&D activities and claim it when you file your corporate income tax return. For Canadian-controlled private corporations (CCPCs), a portion of the credit is refundable, meaning you receive cash back from the CRA even if you owe no taxes. This makes SR&ED especially valuable for startups and growing companies investing heavily in R&D.
Annual SR&ED tax credits claimed
Canadian businesses filing annually
Maximum refundable credit rate (CCPCs)
Eligibility — What Counts as R&D?
For work to qualify under SR&ED, it must meet three criteria defined by the CRA:
1. Scientific or Technological Uncertainty
A scientific or technological uncertainty exists when it is not known at the outset whether a result is achievable, or how to achieve it. This uncertainty cannot be resolvable by standard practice — it requires systematic investigation.
2. Systematic Investigation
The work must be conducted through a systematic process of investigation, including formulating hypotheses, conducting experiments or analysis, and evaluating results. The process must be documented as it occurs.
3. Field of Science or Technology
The work must be in a field of science or technology — natural sciences, engineering, computer science, mathematics, or medical sciences. Social sciences, humanities, and market research generally do not qualify.
Qualifying Expenditures
Not all R&D-related costs qualify. The CRA defines specific categories of eligible expenditures:
Salaries & Wages
Direct salaries, wages, and related benefits of employees engaged in SR&ED. This is typically the largest expenditure category. You must track time spent on eligible vs. non-eligible activities.
Materials
Materials consumed, transformed, or that become part of the SR&ED process — including prototypes, samples, chemicals, and components used in experiments.
Overhead
Can be claimed using the proxy method (55% of direct labour costs, no documentation needed) or the traditional method (track actual overhead costs with receipts). The proxy method is simpler and preferred by most claimants.
Contract Payments
Payments to third parties for SR&ED work performed on your behalf. The contractor must be at arm's length. Different rules apply for payments to research institutions vs. corporations.
Capital Equipment
Equipment that is used directly and solely for SR&ED. Capital costs are claimed through capital cost allowance (CCA) rather than as current expenditures. The Accelerated Investment Incentive can help accelerate claims.
Credit Rates & Refundability
The federal SR&ED investment tax credit rate depends on your business structure and the type of expenditure:
Form T661 — How to File
The SR&ED claim is filed using Form T661 (Claim for Scientific Research and Experimental Development Expenditures). This form is filed alongside your T2 Corporation Income Tax Return.
Key Sections of Form T661
Part 1 — Project Description (Technical)
For each project, you must describe: the scientific or technological uncertainty, the hypothesis or objective, the systematic approach used, the results achieved, and how the work advanced knowledge. This is the most scrutinized section.
Part 2 — Expenditure Summary (Financial)
Break down all SR&ED expenditures by category (salaries, materials, contracts, etc.) and allocate them to individual projects. Also indicate whether you use the proxy or traditional overhead method.
Part 3 — Supporting Information
Information about associated corporations, prior-year claims, and any property acquired for SR&ED purposes. Also includes the allocation of expenditures across provinces.
Filing Timeline
- Claims can be filed up to 18 months after the end of the tax year
- File with your T2 return (usually within 6 months of year-end is best)
- Amended claims for prior years can be filed within the 18-month window
- Filing electronically through the CRA My Business Account is strongly recommended
The CRA Review Process
Understanding how the CRA reviews SR&ED claims helps you prepare documentation that withstands scrutiny.
Filing & Initial Review
You file Form T661 with your T2 return. The CRA performs an initial administrative review to check completeness. Missing information may trigger an immediate request.
Risk Assessment
The CRA assesses your claim for review risk based on claim size, industry, past history, and other factors. Not all claims are selected for review — many are processed without contact.
Technical Review
If selected, a CRA scientific research reviewer with relevant expertise assesses the technical merit of your work. They may request additional documentation, visit your facility, or interview your technical team.
Financial Review
A separate financial reviewer verifies that expenditures claimed are properly documented, reasonable, and correctly categorized. They review timesheets, invoices, contracts, and general ledger entries.
Decision & Notice of Assessment
The CRA issues a Notice of Assessment (NOA) confirming the claim amount. If adjustments are made, you receive a detailed explanation. You can file a Notice of Objection if you disagree with the assessment.
Documentation Best Practices
The CRA requires that you maintain contemporaneous documentation— records created as the work is performed, not reconstructed after the fact. Strong documentation is the single most important factor in a successful SR&ED claim.
Technical Logs & Lab Notebooks
Maintain dated records of experiments, hypotheses, results, and observations. Digital or physical — both are acceptable as long as they are chronological and cannot be altered without detection.
Project Plans & Design Documents
Document the original uncertainty, planned approach, and methodology before work begins. This demonstrates the systematic nature of your investigation.
Timesheets
Track hours spent on SR&ED vs. non-SR&ED activities for each employee. The CRA expects granular, project-level time tracking — not rough estimates.
Meeting Minutes & Emails
Records of technical discussions, problem-solving sessions, and design reviews provide powerful evidence of the systematic investigation process.
Expense Records
Invoices, receipts, purchase orders, and contracts that support the financial amounts claimed. Link each expense to a specific SR&ED project.
Progress Reports & Test Results
Periodic summaries of what was accomplished, what challenges were encountered, and how the approach evolved. These demonstrate continuity and rigor.
Provincial R&D Tax Credits
In addition to the federal SR&ED credit, several provinces offer their own R&D tax credits that stack with the federal program:
Provincial credits are claimed separately from federal SR&ED and require filing additional forms with your provincial tax return. Use SubsidyFinderto find all active R&D tax credit programs.
Common Mistakes & How to Avoid Them
Not documenting contemporaneously
Reconstructed documentation is far less credible. Implement systems to capture technical records and timesheets in real time.
Claiming routine engineering as SR&ED
Routine testing, debugging, and standard product improvements do not qualify. Ensure your work addresses genuine scientific or technological uncertainty.
Poor project descriptions on T661
Vague or generic descriptions are a red flag. Be specific about the uncertainty, your hypothesis, and the experimental approach. Use the CRA's own terminology.
Mixing SR&ED and non-SR&ED time
Employees who split time between SR&ED and other work must track hours precisely. Using the proxy overhead method simplifies expenditure allocation.
Missing the filing deadline
The 18-month deadline is strict. Late claims are rejected. Set calendar reminders well before the deadline and file early.
Ignoring provincial credits
Many claimants file federally but miss valuable provincial R&D tax credits. Check your province's program — they can add 10-14% to your claim.
Not working with a specialist
SR&ED claims are complex. Working with a professional SR&ED consultant or tax firm with SR&ED expertise often results in higher, more defensible claims.
Frequently Asked Questions
What is the SR&ED tax credit?
What qualifies as SR&ED eligible work?
How do I file a SR&ED claim?
What expenditures qualify for SR&ED?
How long does a CRA SR&ED review take?
Can startups benefit from SR&ED?
Maximize your R&D tax credits
Find SR&ED-eligible programs and provincial R&D tax credits on SubsidyFinder.
This guide is for informational purposes only and does not constitute tax or legal advice.
Consult a qualified tax professional before filing your SR&ED claim. Data sourced from CRA and SubsidyFinder.ca database.