HR outsourcing vs EOR vs RPO: Which model fits?

HRO is the practice of delegating one or more HR processes to a specialist third-party provider. The client retains the employment relationship; the provider operates the HR function. The category sits in three sub-types universally recognised by analysts and SHRM:

In HRO, the client is the legal employer. The provider processes payroll in the client’s name, administers benefits under the client’s plan, and reports under the client’s employer identification. HRO solves an operational-capacity or cost-efficiency problem, not a missing-entity problem.

An EOR is a third-party organisation that becomes the legal employer of record for workers it employs on behalf of a client. The EOR holds the employment contract, runs payroll, files taxes, administers benefits, and assumes statutory liability for employment law compliance. The client retains day-to-day operational direction of the worker.

The EOR’s name appears on payslips, on tax filings, and is the entity of record with national registries. EOR is not a staffing or temporary-agency arrangement: a staffing agency supplies labour for defined assignments under user-undertaking direction, whereas an EOR employs on a permanent, ongoing basis. It is also not a PEO: the US PEO model under NAPEO involves co-employment where the client retains legal employer status alongside the PEO, requires a US entity, and has no statutory analogue in most non-US jurisdictions.

RPO is an arrangement in which an employer delegates part or all of the talent acquisition function to an external provider. The Recruitment Process Outsourcing Association defines RPO as a form of BPO in which a provider acts as the company’s internal recruitment function for some or all roles. Everest Group’s 2025 RPO PEAK Matrix assessed over 50 providers across the global and regional cuts.

HRO pricing is almost universally per-employee-per-month (PEPM), with volume breaks at headline thresholds:

• Implementation fees for enterprise-scale MPHRO engagements typically range from USD 150,000 to USD 2,000,000.
• Higher pricing applies in jurisdictions with CBA-bound payroll, sectoral pension routing, statutory reporting cadence, or e-invoicing and digital-bookkeeping mandates.
• Buyer surveys and analyst commentary consistently place Western Europe and the Nordics in the higher band of MPHRO PEPM pricing.
• ISG’s 2025 HRO Provider Lens reports MPHRO administration fees roughly 21 % lower over the five years to 2025, while highly compliance-intensive jurisdictions remain priced above the mean.

EOR pricing usually follows one of two models: a flat monthly fee per employee or a percentage of gross salary. Pricing sits on top of statutory employment costs, which vary materially by country.

Flat-fee structures generally range from USD 199-799 per employee per month, with most full-service global providers operating between USD 400 and 800 per month. Country-specialist providers, particularly India-focused platforms, may price lower because of narrower geographic coverage and standardised operational models.

Percentage-of-payroll pricing typically ranges from 8-20% of gross salary and is more common for variable headcount, contractor-heavy, or project-based workforce structures.

The published service fee is rarely the full employment cost. Additional charges can include:

• Set up and onboarding fees
• Offboarding and termination handling
• Refundable security deposits
• FX conversion markups
• Employer social contributions and statutory benefits
• Severance accruals in long-service jurisdictions

In higher-cost employment markets such as Brazil, mandatory employer contributions, 13th-salary obligations, and severance accruals can add 50-70% on top of base salary before any EOR fee is applied.

RPO pricing varies the most because it incorporates sourcing market depth, role complexity, and volume commitments:

Break-even against contingency search (typically 15-20 % of first-year salary) sits at roughly 15-25 annual hires for a mid-market RPO engagement. RPO typically delivers a 30-50 % reduction in cost-per-hire compared with agency-led recruitment for high-volume programs, per RPOA 2025 Trends Report data drawn from 519 TA leaders.

Civil-law and collective-bargaining jurisdictions sit at the high-complexity end of the framework because employment structure and payroll compliance extend well beyond basic statutory requirements.

Several jurisdictions apply similarly restrictive frameworks worth flagging:

• Germany’s Arbeitnehmerüberlassungsgesetz imposes an 18-month cap on temporary assignments and equal-pay obligations from day one, subject to limited CBA derogations.
• France tightly regulates labour transfer under prêt de main-d’œuvre, while portage salarial functions as the closest equivalent to an EOR structure.
• Mexico’s REPSE reform restricts core-business outsourcing and requires specialised-provider registration with the SAT.
• Brazil’s terceirização regime can impose joint (subsidiary) liability on clients for outsourced labour obligations.

The common pattern across these jurisdictions is that workforce outsourcing models are regulated as employment-law structures rather than simple operational services.

1. <15 annual hires in one market: RPO cost-per-hire produces negative ROI versus contingency search; EOR or direct hiring is more cost-effective.
2. 15-50 hires/year: hybrid RPO or recruiter-on-demand; staffing plus EOR for non-entity situations.
3. 50+ hires/year: full or project RPO justified if sourcing capacity is the constraint.
4. Stable headcount, process-heavy: HRO (payroll/benefits) yields steady PEPM savings versus internal cost.
5. Volatile headcount (ramp/de-ramp): EOR enables rapid onboarding/offboarding without entity lock-in; MPHRO contracts scale down slowly.