The question is not size
The usual framing is that Business Central is for small companies and Finance and Operations is for large ones, with revenue as the dividing line. That framing sells licences and produces bad decisions. Plenty of large organisations run comfortably on Business Central, and plenty of mid-market companies have bought Finance and Operations and spent two years configuring capability they will never switch on.
The real question is how much process complexity you genuinely need, as opposed to how much you have inherited. Those are different numbers, and separating them is most of the work.
What actually pushes you up
A handful of characteristics genuinely require Finance and Operations. If none of these apply, the heavier platform is a cost with no matching benefit.
- Transaction volumes high enough that batch posting windows become a design constraint rather than an inconvenience
- Manufacturing with real production control needs: routing, capacity, quality management and shop-floor execution
- Warehouse management with directed picking, wave and load planning rather than bin locations
- Many legal entities with genuinely different statutory, tax and consolidation treatment, not simply many company codes
- Regulatory obligations that require capability the lighter platform does not carry
What does not push you up
Several things that feel like they should decide it, do not. Headcount does not, on its own. Revenue does not. Ambition does not: buying the heavier platform because you intend to grow into it means paying for years of complexity in advance, and by the time you need it the platform will have moved anyway.
Neither does the presence of a difficult process, until someone has checked whether the process is difficult because the business requires it or because a previous system made it that way. That check takes days and regularly changes the answer.
The cost that gets left out
Licence cost is the visible number and usually the smaller one. The costs that decide the total are implementation effort, the internal time your team spends, and the ongoing cost of running the platform, which includes absorbing updates and maintaining anything custom.
Finance and Operations carries a materially higher ongoing cost across all three. That is worth paying when the capability is needed. It is a poor trade when it is not.
How to make the decision defensible
Run the choice against your processes rather than against a feature matrix. Take the ten processes that matter most, walk each one through both platforms, and write down where each falls short and what closing the gap costs. The answer usually becomes obvious somewhere around process six.
Then have whoever recommends the platform show their working. A recommendation you cannot interrogate is a recommendation you cannot defend to a board, and this is a decision you will live with for a decade.