Common Mistakes Software Startups Make When Claiming SR&ED

The SR&ED program is specifically designed to support the kind of iterative, experimental work that software startups do every day. Yet, a surprising number of companies either fail to claim what they are owed or end up in painful, prolonged audits due to simple structural mistakes.

Here are the top mistakes software companies make when navigating the SR&ED program.

1. Confusing Innovation with "Technological Advancement"

This is the most common pitfall. A startup might build a wildly innovative new product—say, a revolutionary new platform for gig workers—but use entirely standard software engineering practices to do it (React, Node.js, standard REST APIs).

The CRA does not reward business innovation; it rewards technological innovation. If you built a brilliant new app, but your engineers didn't have to invent any new algorithms or overcome any complex architectural hurdles to build it, it is not SR&ED. Your claim narrative must focus heavily on the backend complexities, not the frontend brilliance.

2. Claiming Routine Features and Bug Fixes

Software development is 90% routine work. You cannot claim the time your team spent:

• Integrating standard third-party APIs (Stripe, Twilio).
• Fixing minor bugs discovered during production.
• Refactoring code for readability.
• Designing the user interface.

If an ambitious founder tries to claim that 100% of their engineering team's time was eligible SR&ED, the CRA will immediately launch a full technical audit, as that ratio is virtually impossible in realistic software development.

3. Treating SR&ED as an End-of-Year Accounting Exercise

Waiting until your corporate tax return is due to start thinking about SR&ED is a recipe for disaster.

Memories fade, developers leave the company, and critical architectural decision logs get lost in old Slack channels. SR&ED must be treated as a continuous operational process. You should identify potential SR&ED projects at the start of the year and ensure your team is actively producing contemporaneous documentation (like detailed Jira tickets and timesheets) as they build.

4. Omitting the T661 Filing Deadline

The absolute, hard deadline to file your SR&ED claim (the T661 form and relevant schedules) is 18 months from the end of your tax year.

There are no extensions, no exceptions, and no appeals. If you miss this deadline by a single day, your entire claim is forfeited. Surprisingly, many startups miss out on hundreds of thousands of dollars simply because of poor administrative oversight.

5. Poorly Defined Project Scope

A "project" in the context of the CRA is not necessarily the same as an internal company "epic" or product release. An SR&ED project should be tightly scoped around a specific technological uncertainty.

Grouping all development for a fiscal year under a single project labelled "Development of V2.0 Engine" makes it incredibly difficult to defend during an audit. Instead, break it down: "Project A: Resolving Distributed Caching Latency" and "Project B: Developing Custom ML Classification Algorithm." This granular approach is much easier to defend.