Businesses have been told for a decade that subscribing beats building. For a lot of software that is still true. But per-seat costs compound with headcount while an owned system does not, and a growing number of B2B companies are finding the crossover arrives earlier than they expected.
The cost that does not appear on the invoice
Building on a generic platform means working inside its data model, its interface constraints and its release schedule. For most teams that is a fair trade. It stops being one when the process you are constrained to is the thing your customers actually pay you for.
Where the crossover lands
As a rough guide: a custom build costs more in year one and less over five, with the crossover usually falling between years two and four. The variables that move it are seat count growth, how much of the subscription you genuinely use, and whether the data has to stay under your own control for regulatory reasons.
How to tell which side you are on
If an existing product covers eighty per cent of the requirement and the remaining twenty is negotiable, buy it. Build when the process is the competitive advantage, when licence costs scale faster than the value returned, or when you need the data somewhere a vendor will not put it.