Key takeaway: The SR&ED filing deadline for a corporation is 18 months after your fiscal year end. There are no extensions. File on the deadline and you're fine; file one day later and the credits for that year are gone permanently. For a company at the new $6 million expenditure limit, that can mean walking away from up to $2.1 million in refundable credits for a single year. The deadline is the one part of SR&ED with zero flexibility, so it's the one date your company should never be estimating.
The SR&ED filing deadline works differently from almost every other deadline the CRA gives you. Most tax deadlines cost you interest or a late penalty. This one costs you the entire claim.
Here's the rule, how the dates fall for your fiscal year, what a complete claim has to contain by that date, and why the companies that never sweat the deadline are the ones that stopped treating SR&ED as a year-end scramble.
How the SR&ED filing deadline works
For a corporation, the math is simple. Your T2 corporate return is due 6 months after your fiscal year end. Your SR&ED reporting deadline is 12 months after that T2 due date, per the CRA.
6 + 12 = 18 months after your fiscal year end. That's your wall.
The anchor changes with your taxpayer type, but the structure doesn't:
- Corporations: SR&ED reporting deadline is 12 months after your T2 filing due date. The T2 is due 6 months after year end, so the deadline lands 18 months after year end.
- Individuals with a business: 12 months after your T1 filing due date.
- Trusts: 12 months after your T3 due date, and the T3 is due 90 days after the trust's year end.
If you're incorporated — and most readers of this post are — the 18-months-after-year-end rule is yours.
One more thing the CRA says on the same page, and it's worth taking literally: they recommend you submit your SR&ED claim early, when you file your income taxes. If you file your SR&ED claim with your T2 at the 6-month mark, you have a 12-month buffer, not a deadline problem. The 18-month wall exists for companies that missed SR&ED at tax time and are claiming retroactively.
What the deadline means for your fiscal year end
Find your year end, and you have your wall:
- Fiscal year ending December 31, 2024 — SR&ED deadline was June 30, 2026. If this was you and you didn't file, that year is closed.
- Fiscal year ending January 31, 2025 — file by July 31, 2026. If this is you, you are weeks away from the wall right now.
- Fiscal year ending March 31, 2025 — file by September 30, 2026.
- Fiscal year ending June 30, 2025 — file by December 31, 2026.
- Fiscal year ending September 30, 2025 — file by March 31, 2027.
- Fiscal year ending December 31, 2025 — file by June 30, 2027.
Two useful implications. First, at any moment you can typically still claim for your two most recent completed fiscal years: this year's work at tax time, and last year's work if you missed it. Second, "we'll look into SR&ED next quarter" has a real cost. Every quarter of delay burns runway on the older year, and once its window closes, no amount of good documentation reopens it.
What happens if you miss the SR&ED deadline
You lose the investment tax credits for that year. Not delayed, not discounted. Gone.
This isn't consultant folklore. The CRA's SR&ED Filing Requirements Policy spells it out: if the prescribed forms are not filed by the SR&ED reporting deadline, the CRA "cannot by law allow any additional time to provide the prescribed information" for the expenditures or the credits earned on them. File the forms late and you get a letter telling you the claim was not accepted. The policy's legislative reference is subsection 220(2.2) of the Income Tax Act, titled "No extension to file SR&ED prescribed forms." There is no discretion to ask for, no relief process to apply to.
The same policy closes the side doors too. You cannot file or change a SR&ED claim after the reporting deadline. Once it passes, no additional projects or expenditures will be considered, and you can't substitute new expenditures for ones the CRA disallowed. What you filed by the deadline is the entire universe of your claim.
For a Canadian-controlled private corporation earning the enhanced 35% refundable credit, now on up to $6 million of qualifying spend per year, a missed year can mean walking away from seven figures.
That severity is also why the deadline is the wrong thing to optimize for. A claim assembled in the final weeks before the wall is a claim built from memory: reconstructed timesheets, guessed allocations, narratives written a year and a half after the engineering happened. It might get filed in time. It's also exactly the kind of claim that struggles under a CRA review, because the evidence behind it was created at filing time, not when the work was done.
What a complete claim actually contains
The deadline is really the date your finished claim needs to be in, because the CRA's bar isn't "a form arrived." It's a complete claim with the prescribed information.
Per the CRA's submission guidance, a complete SR&ED claim includes:
- Form T661, SR&ED Expenditures Claim — the current version. This carries your project descriptions and expenditures.
- Schedule T2SCH31 (corporations) or Form T2038(IND) (individuals) — this is where you actually claim the investment tax credit.
- Other forms as needed — T1145, T1146, T1174, T1263, and any attachments, depending on your situation.
The CRA is explicit that you're responsible for the claim being complete, accurate, and supported by evidence before you submit it, whether you prepared it yourself or paid someone else to.
Why does completeness matter so much at the deadline? Because of how the Filing Requirements Policy treats missing pieces. An amount cannot be considered a SR&ED expenditure if it wasn't included with the prescribed information on Form T661 and filed by the reporting deadline. And if the CRA spots deficiencies but the deadline has already passed, it cannot give you time to fix them; the affected expenditures simply don't earn credits. A T661 with three of your eight projects properly described protects three projects. The other five are only safe if their prescribed information is in before the wall.
One version note for claims filed now. The CRA has released a new "(26)" version of Form T661, along with updated versions of T1145, T1146, and Schedule 31, to reflect the recent program changes. There's also a new SR&ED Client Portal inside My Business Account. If your accountant is working from last year's forms, have them check they're filing the current versions.
The two-year claim window in practice
Here's how the window plays out for a real company, because the abstract rule undersells how sharp the edges are.
Say you run a software startup with a December 31 year end. It's July 2026. A peer at another company mentions their SR&ED refund, and you realize the machine-learning pipeline your team rebuilt twice in 2024 and 2025 probably qualified the whole time. You look up the deadlines.
Your 2024 fiscal year closed on June 30, 2026. You missed it by four days. Every eligible dollar your team spent in 2024 is out of reach, permanently, and there is no process that gets it back.
Your 2025 fiscal year is open until June 30, 2027. That claim is fully alive. But the work is already seven to nineteen months old, the engineer who led the hardest stretch gave notice last month, and the technical narrative now has to be rebuilt from commit history and memory.
That's the typical shape of a late SR&ED discovery: one year gone, one year salvageable but degrading. The lesson isn't "file faster once you find out." It's that the two-year window is a grace period for companies that didn't know, not a planning strategy for companies that do. The moment you learn your work might qualify, the oldest open year is the urgent one, and what counts as eligible is worth checking today: work that advances scientific knowledge or technology in the face of real uncertainty, carried out by systematic investigation. If you build software, more of your work qualifies than you'd guess.
Filing early is faster money
The deadline is the latest you can file, not the best time to file. Look at what the CRA commits to once a complete claim is in.
Under the program's service standards, refundable claims accepted as filed are processed within 60 calendar days. Refundable claims selected for review are processed within 180 calendar days. And these aren't aspirational numbers: per the CRA's annual program statistics, in fiscal year 2025-26 the CRA met the 60-day standard 95% of the time and the 180-day standard 92.5% of the time.
The same statistics tell you what to expect. In 2025-26, claimants filed 24,160 claims and the CRA allowed $4.6 billion in investment tax credits. 90% of claims were accepted as filed, no review. And software development alone received 42.6% of the credits allowed, so if you're a software company wondering whether this program is really for you, it is. You're the biggest customer.
Now run the timing. File with your T2 at month 6 and a clean refundable claim can be processed within about two months of that. Wait until month 17 and the same refund lands roughly a year later. For a startup burning cash, that difference is not a rounding error. It's runway you already earned, sitting in a queue you chose to join late.
How the 2026 changes raise the stakes
The 18-month rule hasn't changed. What changed is the size of the cheque you forfeit by missing it.
The Budget 2025 measures became law when Bill C-15 received royal assent on March 26, 2026. For tax years beginning after December 15, 2024, per the CRA's investment tax credit policy:
- The enhanced 35% refundable credit now applies to up to $6 million of qualified expenditures per year for CCPCs, double the old $3 million limit. At the full limit that's up to $2.1 million in credits, and the 35% credit on current expenditures is 100% refundable up to the limit, meaning cash back even with zero tax owing.
- The taxable-capital phase-out moved to $15 million–$75 million, so growing companies keep the enhanced rate much longer than before.
- Eligible Canadian public corporations can now earn the enhanced refundable credit for the first time, if they're listed on a designated stock exchange, resident in Canada, and not controlled by non-residents.
- Capital expenditures are back. Eligible capital property acquired after December 15, 2024 can be claimed again, and the 35% credit on those capital expenditures is 40% refundable.
- The basic rate stays at 15% for everyone else, with qualifying corporations able to get 40% of that 15%-rate credit refunded.
Every one of those changes moves in the same direction: more money per missed year. A company that would have forfeited a $400,000 claim by blowing the deadline in 2023 might forfeit a seven-figure one on the same mistake today. The full rundown of what changed and who it helps is worth ten minutes, but the deadline takeaway is one sentence: the wall didn't move, and the pile of money behind it doubled.
There's also a new way to take review risk off the table before you file. As of April 1, 2026, the CRA offers an optional pre-claim approval process. You apply through My Business Account, and the CRA issues a determination on whether your project work is eligible within 8 weeks. It's open to corporations and partnerships with gross business income under $25 million that are in good standing, for up to 3 projects that haven't previously been claimed or litigated, and an approval holds for up to 3 years. Claims made up only of pre-approved projects can get an accelerated review of expenditures only, within 90 days. None of that extends your reporting deadline. It does mean a company that plans ahead can walk toward the deadline already knowing its projects qualify.
A deadline calendar that runs itself
Almost nobody misses the SR&ED deadline because they're lazy. They miss it, or barely make it, for predictable reasons:
- They didn't know their work qualified. Plenty of software development involves eligible experimental work that founders assume is "just engineering." By the time someone tells them it qualifies, one claim year is already half burned.
- The people with the technical story left. Eighteen months is a long time in a startup. The engineer who fought through the hard problem may be two employers away when someone finally sits down to write the narrative.
- The claim depended on one crunch. If your process is "rebuild the year every spring," any distraction pushes SR&ED to the back of the line: a fundraise, a launch, a departure. The buffer quietly evaporates.
The fix for all three is the same: make the claim exist before filing season. When documentation accumulates while your team builds, captured from the commits, tickets, and discussions where the work actually lives, filing becomes assembly instead of archaeology. The prescribed information the CRA wants on the T661 is being generated in your dev tools every day. The only question is whether anyone is keeping it.
That's how Glauq works. The evidence is collected continuously inside the tools your team already uses, so the technical narrative is built from records made when the work happened, not reconstructed at month 17. Then a qualified, independent SR&ED expert reviews every claim before it goes in and stands behind it if the CRA asks questions. Automation does the gathering; a named expert takes accountability for what's filed. And because the fee is flat rather than a percentage of your refund, a bigger claim under the new $6 million limit doesn't mean a bigger bill. The deadline stops being a wall you race and becomes a date you clear by months.
Frequently asked questions
Can I get an extension on the SR&ED filing deadline? No. The CRA's Filing Requirements Policy states that if the prescribed forms aren't filed by the reporting deadline, the CRA "cannot by law allow any additional time to provide the prescribed information," citing subsection 220(2.2) of the Income Tax Act, "No extension to file SR&ED prescribed forms." A corporation's deadline is 12 months after its T2 filing due date, which works out to 18 months after year end. The one soft edge: if the deadline falls on a weekend or CRA-recognized public holiday, a claim received or postmarked the next business day is on time.
What forms do I need for a SR&ED claim? Form T661 (the current "(26)" version) carrying your project descriptions and expenditures, plus Schedule T2SCH31 if you're a corporation or Form T2038(IND) if you're an individual, to claim the investment tax credit. Depending on your situation you may also need T1145, T1146, T1174, or T1263. Per the CRA's submission page, the claim files with your original or amended income tax return, and you're responsible for it being complete, accurate, and supported by evidence.
Can I still claim SR&ED for last year if I already filed my T2? Yes. The CRA's submission page says to submit your SR&ED claim with your original income tax return or with an amended return for the year, and per the Filing Requirements Policy you can file or change a SR&ED claim up until the reporting deadline, and not after. That's how retroactive claims work, and it's why at any given moment most corporations still have two fiscal years open.
Is the deadline different for individuals or trusts? The structure is the same but the anchor differs: individuals have 12 months after their T1 filing due date, and trusts have 12 months after the T3 due date, per the CRA's deadline guidance. For corporations, the 12-months-after-T2 rule produces the familiar 18-months-after-year-end result.
Does the deadline change under the new 2026 rules? No. The Budget 2025 changes that took effect with Bill C-15 raised the expenditure limit to $6 million, restored capital expenditures, and opened the enhanced credit to eligible public corporations. They did not touch the reporting deadline. The rules about when you file are the same; the amount you lose by filing late roughly doubled.
When should I actually file? With your T2, 6 months after year end, which is also the CRA's own recommendation. A complete refundable claim accepted as filed is processed within 60 calendar days under the CRA's service standards, so early filing gets the refund into the queue up to a year sooner. You keep the remaining 12 months as insurance instead of spending them.
The 18-month rule never bends, but it only feels dangerous when your documentation starts at filing time. Capture the work as it happens, have an expert stand behind the claim, and the deadline becomes the least interesting date on your calendar.
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