How to Calculate Horizon Europe Personnel Costs: Step-by-Step Guide

Personnel costs in Horizon Europe follow the formula: Personnel costs = Daily Rate × Day-equivalents worked on the action. Under the current Horizon Europe Annotated Grant Agreement (v2.0, 01.04.2025), the daily rate is calculated per reporting period: actual personnel costs during the reporting period ÷ maximum declarable day-equivalents in that reporting period (where max declarable day-equivalents = (215 ÷ 12) × number of months in the reporting period). The "215" figure is the per-calendar-year horizontal ceiling on day-equivalents, not a flat annual divisor. This applies to personnel categories A.1-A.4 (employees, natural persons under direct contract, seconded personnel, SME owners), with A.6 as the optional HE Personnel unit cost form that replaces A.1-A.4 when approved. Personnel costs represent the largest budget component in most projects. Since 1 May 2024, beneficiaries can choose between the traditional actual cost method or the simplified personnel unit cost option for their Horizon Europe grants that are mixed actual cost grants (e.g. RIA, CSA, PCP/PPI, COFUND, ERC, EIC, EIT), subject to approval by the granting authority (EU Grants: HE Personnel unit cost procedure: V1.0).

Personnel costs make up the largest single source of financial errors in Horizon 2020 and represent approximately two thirds of the budget in a project, making accurate calculation essential for successful project management. Many coordinators find that establishing clear cost allocation procedures before the project kickoff significantly reduces reporting complications later. Understanding both calculation methods and their specific requirements will help you choose the most appropriate approach for your organization's needs.

What Personnel Cost Categories Exist in Horizon Europe?

Horizon Europe defines four standard personnel cost categories under budget section A (A.1 employees, A.2 natural persons under direct contract, A.3 seconded personnel, A.4 SME owners and natural-person beneficiaries without a salary). Two optional categories may also apply: A.5 covers volunteer work where the call permits it, and A.6 is the HE Personnel unit cost form — an optional simplified replacement for A.1-A.4 when the beneficiary has an approved unit-cost daily rate. Each category has its own eligibility rules and calculation requirements.

A.1 Employees covers staff with employment contracts, including researchers, technicians, and administrative personnel working on the project. Daily rates are calculated per reporting period (actual personnel costs in the RP ÷ maximum declarable day-equivalents in the RP), as set out in Article 1.4 of the Horizon Europe Annotated Grant Agreement (v2.0).

A.2 Natural persons with direct contract includes consultants and freelancers contracted directly by the beneficiary for specific project tasks. Their costs are calculated based on the actual contract value divided by the contracted working days.

A.3 Seconded persons against payment covers staff temporarily assigned from other organizations, with costs calculated based on the secondment agreement terms.

A.4 SME owners and natural-person beneficiaries without a salary covers owners of beneficiary SMEs (and natural-person beneficiaries) who work on the action but do not draw a salary. The cost is a country-adjusted fixed unit cost (€282.22 per day for calls opening before 30/07/2024; €485.86 per day from 30/07/2024) multiplied by the number of day-equivalents worked on the action and the applicable country correction coefficient — not a per-organisation rate from the Portal Participant Register.

A.6 HE Personnel unit cost became available on 1 May 2024 and is the optional simplified form for mixed actual-cost grants (RIA, CSA, PCP/PPI, COFUND, ERC, EIC, EIT). When approved, it replaces categories A.1-A.4 with a single beneficiary-specific daily rate derived from the last closed financial year and approved through the Personnel unit cost wizard in the Funding & Tenders Portal. Approval applies to all subsequent HE/Euratom proposals invited to grant preparation after the approval date, and the approved rate is fixed for at least two years.

How Do You Calculate Actual Personnel Costs?

Actual personnel costs are calculated per reporting period: the daily rate equals the actual personnel costs paid for the person during the reporting period, divided by the maximum declarable day-equivalents in that reporting period. The daily rate is then multiplied by the day-equivalents actually worked on the action. This calculation is done separately for each person and each reporting period.

The "215" figure is the per-calendar-year horizontal ceiling on day-equivalents per person across all EU grants combined — not a flat annual divisor. Maximum declarable day-equivalents in a given reporting period are pro-rated: (215 ÷ 12) × number of months in the reporting period. Your daily rate calculation must include all actual personnel costs paid for that reporting period: gross salary, employer social security contributions, taxes, and any other mandatory employment costs.

Example: for a 10-month reporting period, a full-time employee with €62,500 of actual personnel costs paid during the period has max declarable day-equivalents of (215 ÷ 12) × 10 ≈ 179, giving a daily rate of €62,500 ÷ 179 ≈ €349. If the person worked 50 day-equivalents on the action, claimable personnel costs are €349 × 50 = €17,450.

Part-time and mixed work patterns are computed sub-period by sub-period. A researcher working 50% time for 6 months of a 6-month reporting period contributes max declarable day-equivalents of (215 ÷ 12) × 6 × 0.5 = 53.75, capping how much can be charged to the action over those months.

Time recording requirements are strict: you must maintain reliable records showing exactly how many days each person worked on the project. The Personnel Costs Wizard in the reporting system can help calculate these figures, but the underlying time records remain your responsibility.

What Is the Personnel Unit Cost Option?

The Personnel Unit Cost (PUC) option is a simplified calculation method available since 1 May 2024 that replaces detailed actual cost tracking with a pre-approved daily rate for all personnel. Once approved, this single rate applies to every person working for your organization on any Horizon Europe or Euratom project.

The unit cost rate is calculated using your organization's total staff expenditure and total annual work units from the last closed financial year. Total staff expenditure includes all personnel-related costs as defined in the European Commission's personnel unit cost guidance: salaries, social security, bonuses, benefits, and other employment-related expenses.

The approved unit cost (a daily rate) is calculated as: Daily rate = Total staff costs of the beneficiary in the last closed full financial year ÷ Annual work units in that year ÷ 215, where annual work units equal full-time-equivalent headcount over the year. A cap applies: the unit cost may not exceed €9,618 × the applicable country correction coefficient ÷ 18 (EU Grants: HE Personnel unit cost procedure, V1.0). The approved rate is fixed for at least two years and is country-adjusted at the time of cost claim.

For example, an organisation with €500,000 total staff costs in the last closed financial year and 10 annual work units (FTE-equivalents) would calculate: €500,000 ÷ 10 ÷ 215 = €232.56 per day. Once approved, this rate would apply to all personnel working on Horizon Europe and Euratom projects covered by the unit-cost election, regardless of their individual salary levels.

The approval process requires submitting an audit certificate proving your total staff expenditure and staff numbers through the Portal Participant Register. Once approved, the rate remains valid for at least two years and can be updated every two years until December 31, 2027 (EU Grants: HE Personnel unit cost procedure: V1.0).

How Do You Choose Between Actual Costs and Unit Costs?

The choice between actual costs and personnel unit costs depends on your organization's size, grant portfolio, and administrative capacity. The unit cost option particularly benefits organizations with limited EU funding experience or those seeking to minimize administrative burden.

Organizations with 1-2 grants typically benefit most from unit costs, as they avoid the complexity of detailed time tracking and daily rate calculations for each individual. According to the European Commission's "Personnel Unit Cost" presentation from June 2024, 26,012 beneficiaries had only one grant in Horizon 2020, representing the majority of the programme's participants.

Large organizations with dedicated EU project management staff and established cost tracking systems may prefer actual costs, especially if their personnel cost structures vary significantly between project types or staff categories. Actual costs provide more precise cost allocation and may result in higher reimbursement rates for senior personnel.

Consider your financial year timing: the unit cost calculation uses your last closed financial year, which may not reflect current salary levels if you've had significant staff changes or salary increases. Actual costs capture real-time employment costs more accurately in such situations.

You can change your choice once: after approving unit costs, you may request to revert to actual costs for future grants, but cannot switch back to unit costs afterward. The choice between actual costs and Personnel Unit Costs affects all Horizon Europe and Euratom grants signed after the change date for beneficiaries who have requested and been approved for the Personnel Unit Cost option (EU Grants: HE Personnel unit cost procedure: V1.0).

What Are Common Calculation Errors and How Do You Avoid Them?

Personnel cost errors represent the largest source of financial mistakes in Horizon Europe projects, often resulting from incorrect daily rate calculations, inadequate time recording, or misunderstanding eligibility rules. Personnel costs make up the largest single source of financial errors in Horizon 2020, according to the European Commission's personnel unit cost guidance documents. These errors can lead to cost rejections, audit findings, and recovery procedures.

The most frequent error involves using the wrong basis for daily-rate calculations. For HE actual personnel costs, do not divide annual costs by 215. Calculate per reporting period: actual personnel costs paid during the RP ÷ maximum declarable day-equivalents in the RP, where max declarable day-equivalents = (215 ÷ 12) × number of months in the RP. The "215" is a per-calendar-year horizontal ceiling, not a flat divisor. Never use 365, 250, or any other denominator in place of the RP-based maximum.

Time recording inconsistencies create significant audit risks. You must maintain contemporaneous records showing actual project work, not retrospective estimates or standard allocations. If using timesheets, ensure they're completed regularly and signed by both the employee and supervisor. Electronic time tracking systems must provide audit trails showing when entries were made and by whom.

Mixing different calculation methods within the same reporting period is prohibited. If you switch from actual costs to unit costs (or vice versa), the change applies only to future grants, not ongoing projects. Each grant must use consistent methodology throughout its duration.

Double-counting personnel costs across different budget categories is another common error. An employee's time can only be charged once, whether under A.1 (employees), A.2 (consultants), or any other category. Similarly, personnel costs cannot be claimed under both direct and indirect cost categories.

For organizations using unit costs, failing to update rates when required can lead to incorrect claims. You must request rate updates every two years if your personnel costs change significantly, and the new rate applies to grants invited to preparation after the approval date.

How Should You Document Personnel Costs for Audits?

Personnel cost documentation must provide a clear audit trail from individual timesheets to financial statements, demonstrating both the accuracy of cost calculations and the reality of project work performed. Auditors typically request three levels of documentation: time records, payroll evidence, and cost calculation worksheets.

Time records must show actual project work performed, including dates, project activities, and hours worked. Acceptable formats include detailed timesheets, project diaries, or electronic time tracking systems with individual user access. Generic allocations like "50% to Project A" without specific activity descriptions are insufficient.

Payroll documentation should demonstrate actual employment costs paid, including gross salaries, employer social security contributions, and any additional benefits included in the cost calculation. Bank transfer records, payroll summaries, and employment contracts provide necessary supporting evidence.

Cost calculation worksheets must show how you derived daily rates and applied them. For actual costs: document the reporting-period basis, the maximum declarable day-equivalents calculation, the actual personnel costs during the RP, and the resulting daily rate, then the multiplication by day-equivalents worked on the action. For unit costs: maintain the approved rate documentation from the Portal Participant Register.

Many coordinators establish a standardized documentation package for each reporting period: consolidated timesheets by person, daily rate calculation summary, and payroll cost reconciliation. This approach ensures consistency across reporting periods and simplifies audit preparation.

Electronic records are acceptable provided they include appropriate access controls and audit trails. Screenshots or exports from time tracking systems must show user identification, entry dates, and any subsequent modifications. Regular backups ensure documentation remains available throughout the grant retention period.

Practical Implications for Project Management

Effective personnel cost management begins before project implementation, requiring coordinators to establish clear procedures for time tracking, cost calculation, and documentation. The choice between actual costs and unit costs should align with your consortium's administrative capacity and long-term EU funding strategy.

If your consortium includes partners with limited EU project experience, consider recommending the personnel unit cost option to reduce their administrative burden and error risk. Partners must apply for unit costs individually through their Portal Participant Register accounts, and the approval process typically takes 4-6 weeks.

Create a personnel cost allocation spreadsheet before the kick-off meeting, mapping each partner's staff to work packages using the personnel cost categories. Include daily rate calculations, maximum declarable day-equivalents per reporting period, and cumulative tracking to monitor budget consumption. This tool becomes essential for preparing periodic reports and managing budget amendments.

For multi-national consortia, coordinate personnel cost approaches across partners to ensure reporting consistency. Different partners may use different methods (actual vs. unit costs), but each organization must apply its chosen method consistently across all Horizon Europe grants.

Establish clear timekeeping procedures during the project kick-off meeting, specifying minimum documentation requirements and reporting formats. Partners using actual costs need more detailed time tracking than those with approved unit costs, but both require reliable project work records.

Monitor personnel cost consumption quarterly, comparing actual spending against budget allocations and projected needs. Personnel costs typically consume budget more evenly than equipment or travel costs, making them good indicators of overall project progress and potential budget deviations.

Budget amendments affecting personnel costs require detailed justification showing how the changes support project objectives. The Commission evaluates whether proposed personnel redistributions maintain the work package structure and partner contributions outlined in the grant agreement.

Personnel costs represent the foundation of successful Horizon Europe financial management. Whether you choose actual costs or unit costs, establishing robust calculation procedures and documentation systems from project start ensures smooth reporting and reduces audit risks throughout the grant lifecycle.

Frequently Asked Questions

What is the difference between actual personnel costs and unit costs in Horizon Europe?

Actual personnel costs require calculating an individual daily rate for each person per reporting period (actual personnel costs in the RP ÷ maximum declarable day-equivalents in the RP) and tracking day-equivalents worked on the action. Unit costs use a pre-approved single daily rate for all personnel, simplifying the calculation but requiring initial approval through the Portal Participant Register with audit certification.

How do you calculate the daily rate for personnel costs?

For HE actual personnel costs, the daily rate equals actual personnel costs paid during the reporting period, divided by the maximum declarable day-equivalents in that period ((215 ÷ 12) × months in the RP). Example: €62,500 paid over a 10-month RP ÷ 179 max day-equivalents ≈ €349/day. This rate is then multiplied by the day-equivalents actually worked on the action.

Can different partners in a consortium use different personnel cost methods?

Yes, partners may use different methods within the same project. Some partners use actual costs under categories A.1-A.4 while others elect the HE Personnel unit cost option (A.6). However, each individual partner must use their chosen method consistently across all of their Horizon Europe and Euratom grants once the unit-cost rate has been approved.

What documentation is required for personnel cost audits?

Auditors require three documentation levels: detailed time records showing actual project work performed, payroll evidence demonstrating actual employment costs paid, and cost calculation worksheets showing daily rate derivation and application. Electronic records are acceptable with proper audit trails.

How often can personnel unit costs be updated?

Personnel unit costs can be updated every two years after the initial approval date, until December 31, 2027. Updates require new audit certification and apply to grants invited to preparation after the new approval date, not to ongoing projects using the previous rate.