# Basel IV & core banking: what the new capital rules mean for your platform stack.

The next wave of capital requirements isn't just a compliance update — it's an architectural inflection point for every core banking platform still running on a monolith. Here's how we'd phase the work without taking a customer offline.

Source: https://nearsoft.pt/news/basel-iv-core-banking-platform-stack

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Banking · March 2026 · 5 min read

*M. Andrade · Head of Banking*

Basel IV tightens the link between risk measurement and what you can run in production. If your core still behaves like a single deployable with seasonal freezes, you will feel this as a scheduling problem first — and a capital problem second.

## Where platforms break first

Most pain shows up at the seams: instrument masters, collateral feeds, and the reporting warehouse that was never meant to be a system of record. The fix is rarely “a new module”; it is a phased boundary around what must be immutable versus what can iterate.

## How we phase the work

We start with a thin reporting spine that can replay the past reliably, then migrate risk-bearing paths incrementally. Parallel runs are treated as product features: comparable outputs, explainable deltas, and operator tooling that survives a real audit week.