Source of hire

Source of hire is the breakdown of where successful candidates come from, expressed as the percentage of total hires attributed to each recruitment channel. It answers the question: of all the people we hired this quarter, how many came from job boards, how many from referrals, how many from direct sourcing, and so on.

This metric is essential because recruiting budgets are finite. Organisations spend significant sums across multiple channels: job board subscriptions, agency retainers, recruitment advertising, career fairs, sourcing tools, and referral bonuses. Without source-of-hire data, these investments are made on intuition rather than evidence. A channel that generates thousands of applications but few hires is consuming budget and recruiter time without delivering value. A channel that generates fewer applications but consistently produces quality hires deserves more investment.

Source of hire also enables quality-adjusted channel analysis. By connecting source data to downstream metrics like quality of hire (performance ratings, retention at one year), organisations can evaluate not just which channels produce the most hires but which channels produce the best hires. A referral programme that produces 25% of hires with 95% first-year employee retention rate is a far better investment than a job board that produces 40% of hires with 70% first-year retention, even though the job board delivers more volume.

The metric requires consistent attribution. When a candidate interacts with multiple channels (sees a social media post, then visits the careers page, then gets referred by a friend), the organisation needs a clear rule for which source gets credit. Most use first-touch attribution (the first channel that brought the candidate into the pipeline), though some use last-touch or a weighted model.

Source of hire is calculated for each channel by dividing the number of hires attributed to that channel by the total number of hires. The result is a percentage distribution that shows the relative contribution of each source.

Beyond the simple hire count, the most useful view adds cost and quality dimensions. For each source, calculate the cost per hire (total spend on that channel divided by hires from that channel), quality of hire (average performance rating or retention rate of hires from that channel), and time to hire (average days from application to acceptance for candidates from that channel). This creates a multi-dimensional view that goes far beyond volume.

A metric tree breaks source of hire into the major channel categories and their sub-components, creating a structured view of the entire sourcing ecosystem.

This tree turns source of hire from a reporting metric into a diagnostic tool. If referral hires are declining, the tree shows whether the issue is participation (employees are not referring), conversion (referrals are not being hired), or both. If job board costs are rising without a corresponding increase in hires, the tree shows whether application volume has dropped or conversion rates have deteriorated.

The tree also supports strategic decisions about channel investment. If direct sourcing produces the highest quality hires but only accounts for 15% of total hires due to capacity constraints, the case for expanding the sourcing team is made visible in the data.

1. 1

   Calculate cost per hire and quality of hire by source

   Volume alone is misleading. A channel that produces 30% of hires at twice the cost and half the retention of another channel is not a good investment. Build a source scorecard that combines volume, cost, quality, and speed for each channel. Review it quarterly and shift budget towards the best-performing sources.

2. 2

   Maximise the referral programme

   Referrals consistently outperform other channels on cost, quality, and speed. If your referral programme produces less than 25% of hires, it is underperforming. Increase referral bonuses, make the submission process effortless, provide regular updates to referrers, and publicly celebrate successful referral hires.

3. 3

   Reduce agency dependency for standard roles

   Agency fees are the single largest external recruiting cost for most organisations. Reserve agency usage for genuinely hard-to-fill, senior, or urgent roles where internal sourcing has proven insufficient. Build internal sourcing capability to handle standard recruiting without agency support.

4. 4

   Fix attribution tracking in your ATS

   If a significant percentage of hires have an unknown or miscategorised source, your data is unreliable. Implement mandatory source fields at the application stage, use UTM parameters on careers page links, and train recruiters to verify source data before submitting candidates for review.

5. 5

   Test and iterate on underperforming channels

   Before eliminating a low-performing channel, test whether the issue is the channel itself or how it is being used. A job board with low conversion might improve significantly with better-written job adverts. Direct sourcing with low response rates might improve with more personalised outreach. Diagnose before cutting.

KPI Tree lets you model source of hire as a comprehensive channel performance tree that connects volume, cost, speed, and quality for every sourcing channel. Each source becomes a branch with its own metrics, enabling side-by-side comparison and trend analysis.

The tree connects sourcing data to hiring outcomes: which channels produce hires who stay longest, perform best, and ramp fastest. This transforms source of hire from a backward-looking report into a forward-looking investment model. When planning next quarter's recruiting budget, the tree shows exactly where each pound of spend will deliver the best return.

Segmenting by role type, department, and seniority reveals that the optimal source mix is not the same across the organisation. The tree enables tailored sourcing strategies for each segment rather than a one-size-fits-all approach.