The newest thing accounting does.

Why this landed with accountants

It could have gone to environmental consultants, and largely did for a decade. It came back to the profession for a simple reason: the difficulty was never measuring the carbon. It was making a reported number that somebody outside the business could rely on.

That is a problem accounting has been solving since the clay tablets. Definitions applied consistently, records that support the figure, controls over how it is produced, someone independent able to check it, and a framework everyone agrees to use. Sustainability information now moves through the same machinery, with international assurance standards written specifically for it.

Which is why the useful version of this conversation is not about climate policy. It is about whether a number you publish can be traced, supported and defended, exactly as it would be for revenue.

The standards, and why they are voluntary

The Canadian Sustainability Standards Board published its first two standards in December 2024:

CSDS 1	General requirements for disclosing sustainability-related financial information
CSDS 2	Climate-related disclosures

Both take effect for periods beginning on or after 1 January 2025 and both align with the international standards issued by the ISSB, with additional Canadian transition relief and one jurisdictional modification. That is the same adopt-and-adapt approach Canada has used for accounting standards for years.

The important word is voluntary. A standards board writes standards; it does not compel anyone to use them. Requirement comes from a securities regulator or from legislation, and neither has arrived.

The pause

In April 2025 the Canadian Securities Administrators announced they were pausing work on a mandatory climate disclosure rule, citing developments in the United States and internationally, and indicating they would revisit it in future years.

So the position is unusual: Canada has well-developed standards and no obligation to apply them. Some companies report against them anyway, because investors, lenders or customers ask, or because they expect the requirement to return and would rather build the capability early.

For an owner-managed business, none of this is a filing obligation. What follows is.

Making claims you can stand behind

While disclosure rules were paused, a change went the other way, and it applies whatever the size of the business. It is best read as a standard to meet rather than a trap to avoid, because a business that can evidence its claims is in a stronger selling position than one making vaguer ones.

Amendments to the Competition Act, in force since June 2024, added explicit provisions on misleading environmental claims. Two features make them consequential.

• The burden is reversed. Historically a regulator had to prove a claim was false. Now the party making an environmental claim must be able to show it rests on adequate and proper substantiation, in accordance with recognised methodology. If you cannot support it, that is the problem, whether or not anyone has disproved it
• Private parties can bring cases. Since June 2025 it is no longer only the Commissioner of Competition. Private applicants can seek leave from the Competition Tribunal, which means competitors and interest groups, not just regulators

What substantiation means in practice

Specific, testable claims are far safer than broad ones, because they can be supported.

Difficult to defend	"Environmentally friendly." "Green cleaning." "Sustainable practices." Broad, undefined, and hard to evidence
Defensible	"Our packaging is 80% recycled material." "We reduced fuel use 22% between 2023 and 2025." Specific, measurable, and supported by records you can produce

Claims about the future, such as a net zero commitment, need a real plan behind them rather than an intention. And a claim about the whole business is harder to support than a claim about one product, because it has to hold across everything.

The practical advice is unglamorous: say less, say it precisely, and keep the working papers. Where a claim genuinely matters to how you sell, that is a conversation for a lawyer before it is one for an accountant.

Two obligations that already exist

Separate from any of the above, and easier to miss because neither is described as sustainability reporting.

Supply chain forced labour reporting. Canadian legislation requires certain entities to report annually on steps taken to prevent forced and child labour in their supply chains, with a spring deadline. It catches organizations meeting size thresholds, and a number of mid-sized Canadian businesses discovered they were in scope only after the first year. Worth checking rather than assuming it is aimed at multinationals.

Pressure passed down the chain. The more common route by which sustainability reaches a small business is not regulation at all. A large customer, having taken on its own reporting obligations, sends a questionnaire asking about your emissions, your policies and your suppliers. There is no legal obligation to answer. There is a commercial one, and the businesses that can answer quickly keep the contract.

What this means if you are small

Being clear about proportion, since this subject attracts a lot of noise.

• You almost certainly have no reporting obligation. CSDS is voluntary and aimed at larger reporting entities. You can put the frameworks aside entirely
• Check the claims you already make. If your marketing says anything about the environment, the question is what evidence sits behind it. Costs nothing to review and is worth doing once
• Being able to answer a customer questionnaire is a commercial advantage. The suppliers who respond quickly keep the contract, and most competitors cannot
• The data pays for itself. Fuel, electricity, waste and materials are costs before they are emissions. Businesses that start measuring them almost always find something to reduce, and the saving arrives whether or not anyone ever asks for a report. See accounting solutions

That last point is the one worth taking seriously. The reason this is worth doing early has very little to do with regulation. A business that knows what it consumes has better information than one that does not, and that has always been true.

The sensible sequence: look at the claims you already make, then at the data you already have, and leave the frameworks alone until somebody actually asks.

Where I fit

Worth stating plainly. I am not a sustainability reporting specialist and do not provide assurance over sustainability information, which is a distinct discipline with its own standards and its own qualification.

What I can do sits earlier than that, and for most businesses it is the part that matters: work out whether any of this actually applies to you, review the claims you are already making, get the underlying consumption data measured properly so it is there when somebody asks, and say when a question needs someone else.

The field is growing quickly and the specialists are worth using when the scale justifies it. Most owner-managed businesses are a long way from that point, and are better served by getting the simple things right early.

Questions