CSRD: assurance is the point

SB 253: Scope 3, on a clock

The EUDR: traceability as the whole mechanism

Where all three converge

Different regulators, the same underlying demand — primary data tied to a specific purchase. What each rule requires, and why spend-based estimates stop qualifying.

Three of the most consequential disclosure regimes in the world — the EU’s Corporate Sustainability Reporting Directive, California’s SB 253, and the EU Deforestation Regulation — were written by different bodies, for different purposes, on different timelines. Read them side by side and a single requirement keeps surfacing: primary data, traceable to a specific transaction, not a category average.

That requirement is exactly what a spend-based emissions estimate cannot supply. This is a plain-English walk through what each rule asks for, where they converge, and what a buyer actually needs to hold to answer all three at once.

The Corporate Sustainability Reporting Directive brings emissions disclosure — including Scope 3 — inside the same assurance regime as financial statements for companies in scope. That single change matters more than any individual data point it requires: a number that goes through limited assurance today, with reasonable assurance to follow, has to be defensible the way a revenue figure is defensible. A regional emission factor multiplied by category spend does not hold up to that standard, because it cannot be traced back to what was actually purchased.

In practice, CSRD pushes preparers toward supplier-specific and product-specific data wherever it is available, and treats generic factors as a last resort rather than a default. An instrument that carries its own chain of custody and methodology reference is built for exactly this bar.