Most companies do not decide to outsource a role. They decide to stop tolerating a problem, and outsourcing turns out to be the fix. The order taker who quit twice in a year. The back office backlog that only gets worse during busy season. The sales calendar that stays half empty because nobody has time to prospect. The role was always a candidate for outsourcing. It just took a specific breaking point to notice.
A more useful way to think about it: how repeatable is the work, and how expensive is it to leave unstaffed? Roles that are well documented and repeatable, like order taking, appointment setting, or back office processing, tend to move to an outsourced team cleanly because the process can be taught without years of tribal knowledge. Roles that depend heavily on judgment calls specific to your business are harder to hand off well, at least at first.
The second question matters just as much. A sales team that cannot fill its calendar is losing revenue every week the gap exists. A back office backlog compounds. An unanswered fleet dispatch call during an overnight window has a real cost attached to it. If the cost of the gap is already higher than the cost of building a team to close it, that is usually the actual signal to act, more than any abstract calculation about headcount.
The mistake we see most often is waiting for a perfect internal process before outsourcing anything. In practice, the process gets sharper once an outside team is using it daily and asking the questions your internal team stopped asking a long time ago. Documentation that looked complete on paper usually turns out to have gaps nobody noticed until someone new tried to follow it.
If you are trying to figure out whether a specific role on your team is a fit for this, the honest answer usually takes one conversation, not a lengthy sales process. That is what a discovery call is for.