The build-vs-buy question for a business function, broken into the four factors that actually decide it — not just the price comparison.
"Should we outsource this?" usually gets answered with a spreadsheet comparing salary to vendor fee. That's one input, not the whole decision. Four factors, taken together, give a much more reliable answer.
Is this function part of why customers choose you, or is it necessary infrastructure that doesn't differentiate you at all? A proprietary process that's genuinely part of your competitive edge is worth keeping close, refining internally, and protecting. A standard back-office function — invoicing, scheduling, first-line support — usually isn't, and there's little upside in an in-house team continually reinventing what an external specialist already does well.
Steady, ongoing volume justifies a dedicated resource, in-house or outsourced. Highly variable or seasonal volume almost always favors outsourcing, because you're not paying for idle capacity during the slow periods or scrambling to hire during the busy ones. A function you need constantly is a different decision than one you need in bursts.
Be honest about whether the business actually has — or can realistically build — the skill and management capacity this function needs. Hiring one person to own a specialized process, with no backup and no one internally who can evaluate whether they're doing it well, is a fragile setup regardless of cost. If closing that gap means hiring, training, and managing a new internal specialty from scratch, that's a real cost outsourcing avoids.
Some functions tolerate an error gracefully — it gets caught, corrected, and nobody outside the team notices. Others are unforgiving: a compliance filing, a customer-facing commitment, financial data. The more severe and irreversible a mistake would be, the more this factor should weigh into the decision — sometimes toward outsourcing to a specialist with more built-in quality control than an internal team could justify, sometimes toward keeping it in-house specifically because a specific person needs to feel personally accountable.
A function that's low in strategic importance, steady or seasonal in volume, hard to build internal expertise for, and reasonably tolerant of error is close to a default case for outsourcing. A function that's strategically central, low-volume-but-critical, already staffed by people who do it well, and unforgiving of mistakes usually stays in-house. Most real decisions land somewhere in between — which is normal, and usually means a hybrid is the right call: keep the judgment calls internal, hand off the execution.
Tell us what you're dealing with — we'll tell you exactly how we'd approach it.