External assurance over sustainability data is becoming standard, and it catches first-time reporters off guard because the discipline differs from a financial audit. The assurer is not interested in how good your numbers sound; they want a clean trail from each reported figure back to its source.
The work to be ready is mostly unglamorous housekeeping done in advance. Identify the metrics that will be assured. For each, ask whether you can show where it came from, how it was calculated, and what controls stopped errors creeping in. Where the honest answer is "a spreadsheet someone built last year", you have found a gap to close before the engagement, not during it.
A mock walk-through is the single most useful preparation. Rehearsing the questions the assurer will ask — and discovering which answers you do not yet have — turns a stressful first engagement into a routine one. It also tends to lower the bill, because the assurer spends their time confirming evidence rather than chasing it.
The payoff is a faster, calmer process and a result you can stand behind. Assurance is not a hurdle to clear once; it is a discipline that, once in place, makes every future cycle easier.
More insights
What SGX climate reporting really asks of you
Mandatory climate disclosure now reaches a widening list of issuers. A plain-English walk-through of the ISSB-aligned requirements and a realistic runway to be ready.
Read→ Carbon · 6 min readScope 3: how to start without boiling the ocean
Value-chain emissions are usually the largest and the messiest category. How to find the parts that matter and ignore the precision that changes no decision.
Read→ Reporting · 5 min readThe traps in a first sustainability report
From vague targets to undocumented data, the slips that cost credibility — and how to head them off before an auditor or investor finds them.
Read→