Vol. 1 · No. 202637

Finance edition

in·klare·taal

Edition 202637 · Monday 7 September 2026 · Clarity since 2026

An AI formula disappears from Excel, regulators sound the alarm over AI risks, and tax filing shifts from filling in to reviewing.

What this means for you

Excel formula COPILOT() disappears on 14 September: check your worksheets now

Did you use AI in an Excel cell? Then you need to replace your formulas with the Copilot side panel before Monday.

Microsoft is retiring the beta feature COPILOT() in Excel on 14 September 2026. This feature let you put an AI command straight into a formula, for example to summarise text or classify data. Do you have that formula in your worksheets? Then you need to switch to the Copilot side panel. Microsoft says this side panel offers similar capabilities. Microsoft also stresses that you always check the result yourself, especially for important business decisions.

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Background for subscribers

What this means for you

Check your Excel formulas before Monday

If you currently use AI formulas in Excel, you need to switch quickly to the Copilot side panel before the old feature disappears. You'll also notice that regulators like the IMF and the Financial Stability Board are paying closer attention to AI risks in the financial sector, which affects how banks monitor transactions and must explain them. Your role is also shifting in tax filings and project reports: the AI calculates and processes, but you remain responsible for reviewing and interpreting the outcome.

IMF: the next crash won't come from a coding error, but from AI all doing the same thing

The IMF is calling on central banks to keep a closer eye on AI in the financial sector. IMF economist Tobias Adrian says future market crashes will less often be caused by coding errors. More often, they will be caused by countless AI systems reacting to the same information at the same time. According to the IMF, AI is changing how institutions assess risk, grant credit, and respond to crises. DNB president Olaf Sleijpen also warned earlier about AI-driven cyber risks.

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