You have a CIHR operating grant funding the work, and someone at a conference mentioned SR&ED tax credits in the same breath. The natural worry is that the grant already used up whatever the tax program might have offered, so looking into it now would waste an afternoon.
It won't. Grant funding and SR&ED are not mutually exclusive, and holding one does not make your research ineligible for the other. What a grant does is change the arithmetic, and the mechanics are worth understanding before your next claim.
Assistance reduces the pool, not the eligibility
The program keeps two questions separate that tend to feel like one. First, is the work scientific research or experimental development? Second, how much of the associated expenditure can earn a credit? A grant has no bearing on the first question. Medical research that pushes past established methods generally meets the eligibility bar whether or not a funding body paid for it.
The grant enters at the second question. Government and non-government assistance, which includes most research grants, reduces the pool of qualified expenditures used to calculate the investment tax credit. If a CIHR grant covered part of the salary time and materials that went into eligible work, that covered part comes out of the expenditure base before the credit is figured. The work stays eligible. The claimable amount shrinks by what the grant already paid.
This is the piece clinician-scientists tend to get backwards. They assume the grant disqualifies the project, so they never look. Usually the project is fine, and the real exercise is separating grant-funded expenditure from everything the corporation paid for itself.
Who holds the expenditure matters more than the grant
There is a second issue that catches medical claims, and it has less to do with funding than with structure. To earn the investment tax credit, the work has to have been undertaken by a taxpayer who incurred the expenditure. Universities and hospitals are publicly funded and sit outside the tax system. They can run exceptional research and still have no credit to claim, because there is no tax for a credit to reduce.
So where the work lives becomes the central question. Work done inside your medical professional corporation, paid through the corporation, generates expenditure the corporation can potentially claim. The same work carried on a hospital's account generally does not. When a physician, a professional corporation, and a health-care entity all touch one project, eligibility turns on the facts of who actually performed the work and who bore its cost. That is rarely obvious from the outside, and it is where careful advice earns its place.
What this means before you claim
A few practical points follow. Grant funding is not a disqualifier. What it demands is that you track which dollars came from where, so the expenditure your corporation carried on its own can be told apart from the expenditure a grant covered. That excess, the eligible work your corporation funded beyond the grant, is exactly what the program is built to reward.
The interaction runs in more than one direction. Provincial credits and third-party research payments carry their own treatment. A matched-funding arrangement, such as an industry contribution matched by a granting council, can itself qualify as an eligible third-party payment under specific conditions. These answers are fact-specific, and the specifics decide them.
Clean records make the whole thing defensible, and they are far easier to keep as you go than to rebuild a year later. None of this asks you to choose between grants and credits. It asks you to know which expenditures a grant already covered, and which your corporation carried alone. A short call is usually enough to tell whether there is a claim worth making alongside your current funding.