SR&ED tax credit calculation: methods and rates explained

Your company is conducting research and development, but you have no idea how much it could recover. The SR&ED tax credit calculation can seem like a task reserved for tax specialists, and that perception costs businesses money when they undervalue or abandon their claims.

The good news is that the calculation follows precise rules. Once you understand the applicable rates, eligible expenditures and choice of method, you can estimate your refund more accurately.

This guide breaks down every step. You will learn how the federal credits are calculated, which expenditures count, which method may be preferable and what a complete calculation looks like using a worked example.

How the SR&ED tax credit calculation works

SR&ED is the federal Scientific Research and Experimental Development tax incentive program administered by the Canada Revenue Agency. It provides an investment tax credit on eligible R&D expenditures incurred in Canada.

The calculation rests on three elements: the amount of eligible expenditures, the rate that applies to your type of corporation and the method selected for overhead expenses. Depending on your circumstances, the resulting credit may be refundable—paid in cash even when no tax is owing—or non-refundable.

Understanding this mechanism helps you anticipate your refund and prepare a consistent claim. It is also the foundation for combining the federal credit effectively with provincial support.

For filing purposes, the federal claim accompanies your income tax return through Form T661 and Schedule 31. A corporation must generally file it within 18 months after the end of its tax year or lose its entitlement to the credit.

Federal SR&ED rates in 2026

The rate depends on the nature of your corporation. For tax years beginning after December 15, 2024, the parameters are more generous than before.

An eligible Canadian-controlled private corporation may receive an enhanced 35% refundable credit on eligible expenditures, up to an annual expenditure limit of $6 million. The basic 15% rate applies above that limit.

Eligible Canadian public corporations may also qualify for the enhanced 35% rate up to their expenditure limit. Other corporations generally receive a 15% non-refundable credit. For a Canadian-controlled private corporation, the expenditure limit is gradually reduced when taxable capital used for the calculation is between $15 million and $75 million. For an eligible Canadian public corporation, the reduction is instead based on average gross revenue.

You can confirm current rates directly on the Canada Revenue Agency’s official investment tax credit page.

Which expenditures are included in an SR&ED tax credit calculation

The amount of your credit depends directly on your eligible SR&ED expenditures. Not every expense qualifies, and identifying them correctly helps prevent money from being left on the table.

The main categories of eligible expenditures are:

• Salaries and wages for employees who directly perform SR&ED work in Canada.
• The cost of materials consumed or transformed during research activities.
• Payments to contractors for SR&ED work, generally included at 80% of the eligible amount for arm’s-length contracts.
• R&D overhead expenses, treated under either the proxy or traditional method.
• Certain capital expenditures for eligible property acquired on or after December 16, 2024.

Rigorous documentation is essential to support each expenditure. Our complete guide to SR&ED documentation explains how to protect your claim in the event of a review.

Proxy or traditional method for overhead expenses

The treatment of overhead changes the result of the calculation. Two approaches are available, and the choice is made each year.

The proxy method

The proxy method simplifies the claim. Instead of tracking actual overhead, you claim a prescribed proxy amount of up to 55% of directly engaged SR&ED salaries. This reduces the record-keeping burden, which is why many SMEs choose it.

The traditional method

This approach requires you to identify and claim the actual overhead expenses directly attributable to SR&ED, such as a portion of rent, electricity or supplies. It requires more detailed tracking but may be advantageous when actual overhead exceeds the proxy amount.

A worked SR&ED tax credit calculation

A worked example is the clearest way to understand the calculation. Consider an eligible Canadian-controlled private corporation that uses the proxy method and remains below the $6 million expenditure limit.

Calculation item	Amount
Direct SR&ED salaries	$500,000
Materials consumed	$50,000
Eligible contract expenditures (80% of $100,000)	$80,000
Proxy amount (55% of salaries)	$275,000
Total eligible expenditures	$905,000
Refundable federal credit (35%)	$316,750

In this example, the company receives a $316,750 refundable federal credit. This figure is illustrative and depends on the actual eligibility of the work and expenditures, as well as the Canada Revenue Agency’s review. Provincial credits are calculated separately.

Would you like to estimate your own refund using actual figures? Discuss your project with a specialist for an assessment tailored to your situation.

Quebec’s provincial credit is added to the federal credit

The federal credit is only part of the equation. Quebec offers its own R&D support, which may be combined with the federal credit for work carried out in the province.

For tax years beginning after March 25, 2025, Quebec consolidated several former credits into the tax credit for R&D, innovation and pre-commercialization. This reform changes how the provincial portion is calculated, making it important to treat the two levels of government separately.

For a detailed explanation, read our article on Quebec’s CRIC tax credit. By combining both levels effectively, a Quebec business may recover a substantial share of its eligible R&D expenditures.

Calculate your SR&ED tax credit successfully and maximize your refund

An SR&ED tax credit calculation comes down to three decisions: correctly identifying eligible expenditures, applying the right rate for the corporation and selecting the most advantageous overhead method. Once these elements are understood, the estimate becomes much clearer.

Rates and limits evolve, and the provincial portion now follows new rules, so professional validation helps protect the value of your claim. Confirm the federal parameters on the official investment tax credit page, then book a consultation to maximize your credit.

FAQ

How do you calculate an SR&ED tax credit in Quebec?

An SR&ED tax credit calculation adds eligible expenditures, including R&D salaries, materials consumed, eligible contract expenditures and overhead. The federal rate that corresponds to the corporation’s circumstances is then applied. An eligible Canadian-controlled private corporation may qualify for the refundable 35% rate below its annual expenditure limit. Quebec’s provincial credit is calculated separately and may be added to the federal credit for work carried out in the province.

Is the SR&ED tax credit refundable?

It depends on the type of corporation, the type of expenditure and the applicable limit. An eligible Canadian-controlled private corporation may receive a refundable 35% credit on eligible current expenditures below its limit. Above the limit, and for most other corporations, the 15% credit is generally non-refundable and reduces income tax payable.

Should you choose the proxy or traditional method?

The proxy method replaces actual overhead with an amount of up to 55% of direct SR&ED salaries, simplifying record keeping. The traditional method claims actual overhead attributable to R&D. Many SMEs choose the proxy method, but the traditional approach may produce a larger claim when actual overhead is high. The choice is made annually.