Japan's megabanks race to digitize SME services as lending rates climb

Japan's three megabanks are racing to capture a market they have long taken for granted. As the Bank of Japan pushes interest rates higher—reaching their highest point in nearly two decades—the country's largest financial institutions are pouring resources into digital platforms designed to serve the small and medium-sized businesses that form the backbone of the Japanese economy. These companies represent 99 percent of all Japanese firms, yet they have historically received less attention from major banks than their larger corporate counterparts. Now, with lending margins tightening and competition intensifying, that calculus is shifting.

Sumitomo Mitsui Banking Corp. moved first. In May 2025, the bank launched Trunk, a smartphone-based financial service built specifically for small and medium-sized enterprises. The platform handles accounting tasks—bill payments, transfers, basic bookkeeping—directly from a phone. It also incorporates artificial intelligence to alert users about available government subsidies and other financial support programs they might otherwise miss. By July 2026, just over a year after launch, Trunk had attracted more than 90,000 accounts. That same month, SMBC announced a new feature allowing companies in Tokyo to apply for loans backed by credit guarantee associations, while also cutting fees on transfers to other banks to make the service more competitive.

Mizuho Bank entered the arena a month later, in June 2026, with Upsider Bank. The service is designed to move faster than traditional banking: corporate clients can open an account on the same day they apply. The bank set its transfer fee at ¥100—a deliberate undercut positioned as the lowest in the industry. Like Trunk, Upsider uses artificial intelligence to evaluate loan applications, but Mizuho has framed the service more broadly, marketing it as a companion for companies at any stage, from startup through expansion.

The ambitions here are substantial. Mizuho Financial Group President Masahiro Kihara articulated the strategic logic plainly: a huge share of Japan's workforce is employed by small, medium, or mid-sized companies. If those businesses do not grow, neither will the large corporations that depend on them as suppliers, customers, and partners. By fiscal year 2030, Mizuho plans to have issued ¥500 billion in cumulative loans through Upsider Bank and to have attracted 100,000 accounts to the platform. That target reflects both the scale of the opportunity and the intensity of the competition.

MUFG Bank, the third megabank, has not yet launched a full digital lending service, but the company is moving. In July 2026, MUFG announced a platform to handle back-office operations for small and medium-sized enterprises—accounting, payroll, administrative work—the unglamorous infrastructure that consumes time and money. The bank has committed to launching digital financial services for this segment by March 2027, signaling that the race is far from over.

The numbers explain the urgency. Small and medium-sized businesses account for roughly 70 percent of all lending by Japanese banks—about ¥460 trillion as of March 2026. That is 2.5 times the volume of loans to large corporations. Yet these businesses have traditionally been underserved by digital innovation, partly because they are harder to serve at scale and partly because the margins have been thinner. Now, with the Bank of Japan raising rates—the average rate on new loans reached 1.813 percent in March, the highest since July 2007—the economics of SME lending are shifting. Digital platforms reduce the cost of customer acquisition and loan processing. They also make it easier to cross-sell additional services. For banks facing margin compression, that efficiency matters.

What remains to be seen is whether these platforms can retain customers once they are acquired. Trunk and Upsider are built on convenience and price, but they operate in a market where switching costs are low and loyalty is thin. The banks are betting that by embedding themselves in the daily operations of small businesses—handling their accounting, their transfers, their loan applications—they can become essential infrastructure rather than interchangeable vendors. Whether that bet pays off will depend not just on the features these platforms offer, but on how well they execute at scale and how quickly competitors respond.