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    Expenditure guide

    Qualifying R&D costs

    Only eligible expenditure attributable to qualifying R&D activity can enter a claim, and the rules depend on the accounting period and contractual arrangements.

    Reviewed by Richard Canfer-Taylor
    Published and reviewed 15 September 2026

    Key points

    • Staffing costs can include relevant salary, employer NIC and pension contributions.
    • Externally provided workers and contracted-out R&D have specific conditions and apportionment rules.
    • Software, consumables, data and cloud computing may qualify when used directly for R&D.
    • Overseas expenditure restrictions and connected-party rules require specific review.

    Match costs to qualifying activity

    Start with the qualifying project boundaries, then identify the people and resources used to resolve the scientific or technological uncertainty. A broad percentage applied to all innovation spending is not a substitute for a supportable allocation.

    Review each cost category

    Payroll records, invoices and contracts should be reconciled to the accounts. The contract and who initiated the R&D can affect the treatment of contracted work under the merged scheme.

    • Employees and qualifying staffing costs
    • Externally provided workers
    • Contracted-out R&D
    • Software licences, data and cloud computing
    • Consumable materials and certain payments to clinical-trial volunteers

    Check restrictions for the period

    Rules changed for accounting periods beginning on or after 1 April 2024. Overseas expenditure, subsidised work and contracting arrangements should be reviewed against the legislation and guidance applicable to the exact period.