SME Banking: The Underserved Segment Your Core Can Capture

WAU Marketing
Jul 23
4 min read

If your bank "doesn't serve SMEs because they aren't profitable," the problem isn't the SME—it's your core. LATAM's largest segment isn't underserved for lack of demand, but because your systems can't serve it at a cost that works.

There's a comfortable belief in the region's banking: SMEs are too risky, too small, and too expensive to serve, so they end up in no-man's-land—neither consumer banking nor corporate banking. It's a half-truth that hides an uncomfortable one. SMEs aren't unservable; a legacy core makes them unservable, because the cost of originating, assessing, and managing a small loan is almost the same as a large one. What fixes that equation isn't the sales team—it's the architecture.

The size of the segment banks treat as a niche

Let's start with scale, because it changes the whole conversation. In Latin America, micro, small, and medium enterprises make up around 99% of all companies and employ close to 67% of workers, according to ECLAC/CEPAL. That's not a niche: it's the economy.

In Mexico the picture is even sharper. The 2024 Economic Census counted 5,451,113 economic units, of which 95.5% were micro, 3.7% small, and 0.7% medium—meaning MSMEs are essentially 99.9% of the registry—according to INEGI. Together, micro, small, and medium firms employ nearly 7 of every 10 working people (41.5% + 14.8% + 14.4%) and generate more than half of private-sector revenue (17.1% + 17.6% + 21.8%), per the same INEGI figures. A bank that "doesn't serve this group well" is walking away from the largest market in front of it.

The credit gap: the figure that should sting

Here's the hole. The International Finance Corporation (IFC) estimates the MSME financing gap in emerging and developing markets reached US$5.7 trillion in 2019, equal to 19% of those economies' GDP, according to the SME Finance Forum's MSME Finance Gap report (managed by IFC). Of that total, Latin America and the Caribbean's share is around US$1.2 trillion, per IFC's estimate reported by News Americas, which notes that about 87% of the region's SME financing needs go unmet.

Translated: the segment that sustains the region's jobs and GDP is precisely the one that receives the least credit. Not for lack of demand—demand is enormous—but because supply doesn't reach it.

Why a legacy core can't serve an SME

The easy answer is "risk." The honest answer is "unit cost and data." For a core designed in another era, assessing an SME is expensive and slow, so banks offset the risk by demanding disproportionate collateral. In Mexico, banks can require collateral coverage of nearly 200% of the loan, according to analysis compiled by ECLAC/CEPAL. An SME that needs working capital rarely has double that in assets to pledge; the loan dies right there.

There's a second, quieter problem: the data. SMEs leave digital traces—sales, invoicing, cash flows, payments—that would allow them to be assessed without pledging a building. But a legacy core neither captures nor exposes them. INEGI itself shows the lag: just 23.5% of microenterprises use the internet for their activities, versus 82.1% of small firms and 93.1% of large ones, per the 2024 Economic Census. A bank that can only read formal financial statements is blind to an entire universe of alternative signals.

And productivity makes the loop worse. ECLAC notes that in the region large firms can be up to 33 times more productive than microenterprises, per its characterization of the segment. That productivity gap is fed, in part, by the credit gap: without nimble financing, the SME doesn't invest, doesn't grow, and doesn't raise its productivity. Breaking the cycle starts with credit.

What the market already proved: the segment is profitable

The "they aren't profitable" argument collapses against the evidence. Fintechs built on modern architecture are doing exactly what traditional banks say can't be done. In Mexico, Konfío disbursed more than US$986 million in SME credit between 2024 and 2025 and has financed nearly 80,000 companies, with a telling data point: 84% of its clients access their first business loan through the platform, as LatamFintech reported. In other words, these are SMEs traditional banking had never banked.

The difference isn't risk appetite: it's architecture. Whoever can originate, assess with alternative data, and manage a small loan at low marginal cost turns profitable what is loss-making for a legacy core. The segment didn't change; the technology serving it did.

What capturing the SME requires (and why it's a core problem)

Serving an SME profitably imposes requirements a legacy core can't meet: 100% digital onboarding in minutes, not weeks; credit assessment based on real-time transactional data, not just collateral; tailored products—revolving lines, factoring, microcredit—configurable without rewriting the system; and a per-account operating cost low enough that a small ticket still leaves margin. None of that comes from patching a core that only processes in batches and only speaks the language of corporate lending.

How we see it at WAU

At WAU we don't see the SME as a "difficult" segment; we see it as the segment your architecture can't yet capture. We design a modern core—data accessible via API in real time, parameterizable products, automatable origination and scoring, low unit cost—that makes it viable to serve the millions of firms left out today. SME banking isn't won with commercial willpower; it's won with a core that makes the small ticket profitable.

If you want to stop ceding the region's largest segment to fintechs, let's talk. We'll help you see what your architecture needs to turn the underserved SME into your next engine of growth. 👉 Book a conversation with our team.