When to keep using the spreadsheet, and when to invest in BI and automation
Published 23 September 2026
Excel is the accountant's best friend. It is fast, flexible and universal — nothing beats it for ad-hoc analysis, a quick model or a one-off schedule. Most finance people, myself included, reach for it every week. But Excel is also where a lot of good finance functions quietly get stuck, because a tool built for flexibility ends up carrying work it was never designed for.
For quick analysis, prototyping a calculation, a small model, a one-off report, or exploring the numbers before you even know the question — Excel is usually the right answer, and reaching for a BI tool would be overkill. If the task is temporary, personal or exploratory, keep it in the spreadsheet.
Excel strains on the recurring, shared, multi-source work: the report rebuilt every month, the pack consolidated by hand across entities, the file emailed around in five versions, the model only one person understands. That is not a failure of Excel — it is using a flexible tool for a job that needs a repeatable, controlled process.
| Excel | Power BI | |
|---|---|---|
| Ad-hoc analysis & one-off models | Ideal — fast and flexible | Overkill for a quick, throwaway task |
| Recurring monthly reports | Rebuilt or refreshed by hand each cycle | Built once, refreshed on a schedule |
| Multiple data sources | Copied and pasted together manually | Connected and combined automatically |
| Consolidation across entities | Done by hand into a group file | Rolls up from one model — the sum of the parts |
| Version control | Many files — “which one is right?” | One source, one version |
| Users and access | Emailed files; access is all or nothing | Shared live, with row-level security |
| Data volume | Slows and strains as data grows | Built for large volumes |
| Trust and audit trail | Hidden formulas, easy to break silently | Documented measures, traceable to source |
A good accountant knows which tool fits the job. The signal to invest in BI or automation is rarely one big thing — it is a pattern:
When several of those are true, the hours spent maintaining spreadsheets are worth more invested once in an automated model that reconciles to your existing reports and then runs itself.
This isn't a case for abandoning Excel. Keep it for analysis and the quick job; move the recurring, shared, reconciled reporting onto a model that refreshes itself. Knowing where that line sits — and when you have crossed it — is part of the craft.
If you are weighing up where that line sits for your reporting, talk to us, or read more about how we automate manual Excel reporting.