Bank Zero, the South African app-only bank, has reached break-even five years after opening to the public, and a partnership model is now positioning the branchless lender to scale well beyond its own customer base.

The bank recorded its first break-even month in August, meaning its revenue covered its operating costs for the month. The milestone does not signal consistent profitability, and Bank Zero expects earnings to remain uneven in the short term.

Growth is now being driven through alliance banking, in which the bank supplies its infrastructure to fintechs, retailers and digital platforms. Bank Zero counts 275,000 direct customers, while its partnerships are bringing a further 500,000 users onto the platform, although some overlap with its existing base. That marks a major shift for a bank originally designed to reach profitability with around 100,000 customers, and its challenge now is to prove that the technology and cost structure behind break-even can support a far larger business.

Founded in 2018, Bank Zero opened to the public in August 2021 on the premise that a new lender did not need millions of customers to cover the cost of its technology and operations. The bank operates entirely through its app, without a branch network, and rather than buying an established banking platform and adapting it, it built its own.

"The cost profile is fundamentally different from a traditional bank – which is why break-even could be achieved at low customer numbers," Yatin Narsai, Bank Zero's chief executive officer (CEO), told TechCabal on Tuesday.

The company says it invested just under R300 million ($18.5 million) to build its banking platform and support systems and to operate the bank until it reached break-even. Narsai estimates that buying and customising a comparable platform would have cost at least R3 billion ($184.6 million), before ongoing maintenance and modification costs. On those figures, the bank's entire build-and-operate spend came to roughly a tenth of the buy-and-customise route — a cost gap that sits at the centre of how it covered its expenses at low customer numbers.

Owning the technology also gives the bank control over features that would be difficult to bolt onto an off-the-shelf system. Narsai claims a special patent makes card fraud and phishing impossible on the platform, while compliance controls are built directly into the system.

The bank's model has also drawn more business customers than expected. Businesses now account for 18% of its customer base, compared with the 10% projected in its original business case, and more than 80% of them are registered companies.

"It's not only about the zero fees. There is unique business-specific functionality," Narsai said, pointing to digital mandates, multi-level authorisation chains, bulk payments and alerts when account details change.

The economics work in the bank's favour as well. "Business customers are significantly more profitable than individuals due to higher account balances," he added.

Alliance banking is where the model takes a different shape. Instead of acquiring every customer itself, Bank Zero provides the underlying banking infrastructure that lets fintechs, retailers and digital platforms issue card products, while bringing their customers, deposits and transaction activity onto the bank's platform. The shift moves the bank's growth engine from direct customer acquisition to partner distribution.

The bank spent more than 18 months developing the proposition before going live in January 2026, and Narsai says demand has been significant since launch.

"Many scheme operators (businesses that run large payment schemes) are wanting to switch to a new end-to-end value chain that's not only cheaper but also unique," he stated.

Mukuru, an African remittance fintech serving migrant communities, shows what that could mean at scale. Narsai said 500,000 Mukuru customers are being onboarded onto Bank Zero's platform, expanding the bank's reach to more than 700,000 end account holders.

Chairman Michael Jordaan, a former chief executive of First National Bank, has described the bank's ability to reach profitability without a lending book as another advantage. Bank Zero got to break-even with a relatively small customer base without taking on lending risk, and lending could later provide another source of growth.

Narsai is now focused on larger partnerships. "We're going to focus on the big fish, and we are talking about big books," he said.

Looking ahead, the lender expects earnings to remain uneven in the near term but forecasts stronger revenue growth and a healthy profit in 2027. Much of that growth is expected to come from alliance banking, with new foreign-exchange capabilities also awaiting approval from the South African Reserve Bank. From here, the markers to watch are concrete: the pace of the Mukuru onboarding, the Reserve Bank's decision on the new capabilities, and whether the 2027 forecast holds against the bank's own expectation of uneven earnings in the meantime.