Open banking swings both ways for big banks on risks and opportunities: experts

He said the cost of implementing open banking is already a headwind for the group, and there is a risk it will become “very disruptive,” albeit over a longer period of time.

“The largest deposit holders immediately are probably not going to see that much disruption, but over time — 10, 15 years — we could see more significant erosion in terms of market share,” Aiken said.

However, Aiken said the banks could also benefit in certain ways.

For example, he said banks would be able to get access to information like customer investments held at other financial institutions. The banks could then try to convince those customers to bring their external investments in-house.

“The Canadian banks have far more data within their system that they are utilizing, I would argue quite well, (and) with extra information that’ll be helpful,” Aiken said.

“However, what open banking does is also provide that information to other players, and that is the perceived threat on the fintechs or the digital startups.”

Henry Kim, a professor at York University’s Schulich School of Business, said that Canada’s banking system effectively being an oligopoly could help the large lenders adjust.

“With such a high concentration, the banks could sit back and say ‘Well here’s a fintech that’s been doing well and buy them out or replicate that.’ They have significant power already,” Kim said.

As of the fourth quarter of 2025, Statistics Canada figures showed the Big Six banks held a more than 90 per cent share of all banking assets.

Overall, Kim is optimistic that open banking will drive positive changes in the industry.

“Down the road when the dust settles and the ecosystem figures out how all these technologies work, I believe there will be an opportunity for consumers to actually have options and have choice,” he said.

In an interview after the 2026 Global Open Finance Summit last month, Steve Boms, executive director of the Financial Data and Technology Association, said the earliest consumers could get access to open banking tools would be toward the end of 2027.

The summit featured talks from Bank of Canada and Finance Department officials on the implementation of an open banking framework. It also included discussions on how major financial institutions are viewing the situation.

In markets where open banking is further along than Canada, Boms said financial institutions were defensive at first, but that changed.

“Over time, it became more of an offensive posture and by that I mean being able to interact with customer permission data in ways that delight customers, that provide them more options, more tools that can expand creditworthiness and access to affordable credit,” he said.

He said that lenders with the most resources to spend on tech development and marketing could stand to benefit from consumer-driven banking changes.

“The banks aren’t just going to be the data providers; they’re also going to be the recipients because the third party also has to share data with the customer’s consent. So I actually think there’s a lot to like from the Canadian banks’ perspective,” Boms said.

Ethan Teclu, a spokesperson for the Canadian Bankers Association, said in a statement that it is committed to fostering innovation and competition in Canada’s financial sector in a responsible way.

“As the voice of banks in Canada, the CBA has advocated and collaborated with our members and the government to provide guidance on creating a consumer-driven banking framework that serves Canadians while ensuring the stability of our financial system,” the statement reads.

“As Canada moves towards implementation, we can apply learnings from other jurisdictions, such as the benefits of a phased approach, regulatory efficiency, and moving towards more secure, interoperable ways to share financial data.”

This report by The Canadian Press was first published Oct. 4, 2026.

Daniel Johnson, The Canadian Press