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Recruitment Agency vs In-House Recruiter: Which Actually Costs Less?

Talentrix Team5 min read

The comparison is usually framed as a percentage versus a salary, which is the wrong shape. An in-house recruiter is a fixed cost that scales badly at low volume. Agency fees are a variable cost that scales badly at high volume. Which is cheaper depends almost entirely on how many people you're hiring.

Here's how to work it out for your own numbers.

The three options

Agency, contingency. A percentage of first-year salary per hire, paid only on success. No fixed cost. Scales linearly — every hire costs the same as the last.

In-house recruiter. A salaried employee. Fixed cost regardless of how many roles you fill. Cheap per hire at volume, expensive per hire when quiet.

RPO / dedicated recruiter. A named external recruiter working your roles for a monthly retainer. Sits between the two: fixed monthly cost, but no employment overhead and you can scale it down.

Count the in-house cost properly

The salary is not the cost. A fully loaded in-house recruiter includes:

  • Base salary
  • Employer taxes and statutory contributions
  • Benefits, and any bonus
  • Job board and LinkedIn Recruiter licences — these are a serious line item and are easy to forget
  • ATS and assessment tooling
  • Desk, equipment, management time
  • Their own recruitment cost, and the cost of the seat sitting empty when they leave

Depending on market, the true cost commonly lands meaningfully above headline salary once tooling is included. Whatever your local multiplier is, apply it honestly — comparing a bare salary against an agency fee will give you the wrong answer.

The number everyone leaves out

Cost of vacancy. What does an unfilled role cost you per week?

For a revenue-generating role, it's the revenue not generated. For an engineer, it's the roadmap slipping. For an operational role, it's the overtime and error rate of the people covering.

Work out a per-week figure, even a rough one. Then multiply by the difference in time-to-hire between your options. If an agency fills a role six weeks sooner than an unsupported internal search, six weeks of vacancy cost is a real saving that belongs on the agency side of the ledger — and for a senior commercial role it can exceed the entire fee.

This is the single most common error in these comparisons. Companies count the fee precisely and the vacancy at zero.

Where each option wins

Agency wins when:

  • You hire in single figures per year
  • Roles are senior, specialist, or confidential
  • Hiring is lumpy — a burst, then months of nothing
  • You're entering a market you don't know
  • The role is revenue-critical and speed dominates cost

In-house wins when:

  • You hire steadily and in volume, all year
  • Roles are similar enough that one person builds real pipeline
  • You have strong inbound applications already
  • Employer brand and candidate experience are strategic for you

RPO wins when:

  • You're between the two — hiring continuously but not enough to justify a full team
  • Volume is seasonal and you need to flex
  • You want an in-house model without the entity, tooling and management overhead

Do the arithmetic

A simple version you can run in ten minutes:

  1. Expected hires this year — be honest, not aspirational.
  2. Average salary across those roles.
  3. Agency cost = hires × salary × fee percentage.
  4. In-house cost = fully loaded recruiter cost, plus tooling, divided by nothing — it's fixed. Compare the totals, then divide by hires for cost per hire.
  5. Vacancy adjustment = (weeks-to-hire difference) × (weekly vacancy cost) × hires. Subtract from whichever option fills faster.

At low volume the fixed cost of a recruiter is spread across too few hires and the per-hire number is poor. There's a crossover point where it flips. Find yours rather than assuming.

The hybrid most companies land on

In practice, few companies pick one and stop. The common shape:

  • In-house handles high-volume, repeatable roles where pipeline compounds and employer brand matters.
  • Agency handles senior, specialist and confidential searches, plus anything urgent or in an unfamiliar market.

This works because the two are good at different things. An in-house recruiter accumulates knowledge of your business that no external partner will match. An agency accumulates a market network that no single in-house recruiter can maintain across every discipline you hire for.

What the numbers won't tell you

Two things sit outside the spreadsheet and often decide it.

Confidentiality. If you're replacing someone who is still in post, an internal search is not an option.

Market access. For a scarce skill, the constraint isn't screening capacity — it's knowing who the fifteen credible people are and having a reason for them to take your call. That's a network, and it's the thing you're actually buying from an agency.

Related reading


Not sure which model fits your volume? Talentrix works both ways: 18% of first-year salary paid only when you hire, or a dedicated recruiter on a monthly retainer for companies hiring continuously. We'll tell you honestly which one fits — including when it's neither. See how the two compare or tell us what you're hiring for.

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