R&D tax credit

What is an R&D tax credit and how does it work?

R&D tax credits incentivise qualifying research-and-development expenditure by reducing corporate-tax liability dollar-for-dollar (credit) or through enhanced deductions (super-deduction). The substantive policy goal: most jurisdictions view R&D as having positive externalities that the market alone would underprovide; tax incentives correct the under-provision by socialising part of the cost. The OECD has tracked R&D tax-incentive design across member economies for decades; the post-BEPS framework requires R&D incentives to comply with Pillar Two minimum-tax rules where applicable. Two principal credit-design variants: (i) volume-based credits (a percentage of qualifying R&D expenditure regardless of growth) and (ii) incremental credits (a percentage of expenditure above a baseline of historical or normalised R&D spending). The US IRC §41 credit operates as an incremental credit; the UK post-2024 RDEC operates as volume-based; most other major-economy regimes mix the two approaches.

How does the US Research Credit operate?

The US Research Credit under IRC §41 is the principal federal R&D tax incentive. The standard credit: 20 percent of Qualified Research Expenses (QREs) above a base amount derived from historical R&D-to-revenue ratios under the regular method, OR 14 percent of QREs above 50 percent of average prior-three-year QREs under the Alternative Simplified Credit (ASC) method. The ASC is the more commonly used method post-2007 because it does not require historical R&D data. QREs include in-house research expenses (qualifying employee wages, supplies, contract research at 65 percent), with the four-part test under §41(d): permitted purpose (technological in nature), elimination of uncertainty, process of experimentation, and elimination of uncertainty. The post-2022 capitalisation rule under §174 requires R&D expenditures to be capitalised and amortised (5 years domestic, 15 years foreign) rather than expensed — this materially affects R&D-credit interaction and was the subject of multiple legislative reform proposals through 2024-25. State-level R&D credits are available in approximately 35 US states (California, Texas, New York, etc.) with material variation in conformity to the federal rules.

How does the UK R&D regime compare?

The UK R&D tax framework was substantially restructured from 1 April 2024, merging the SME and RDEC schemes into a single regime for most companies. The post-2024 merged R&D Expenditure Credit operates as a 20 percent above-the-line credit on qualifying R&D expenditure, taxable at the corporate rate (effective net 15 percent at the 25 percent main rate). The Enhanced R&D Intensive Support (ERIS) scheme operates separately for loss-making R&D-intensive SMEs (R&D >40 percent of total expenditure for tax periods beginning on or after 1 April 2024, lowered from the prior 40 percent threshold over the post-2023 reform). ERIS provides a 27 percent payable credit on qualifying surrendered losses up to a per-period cap. The pre-2024 SME scheme — which gave loss-making SMEs a 33 percent payable credit on enhanced QREs — was substantially curtailed. UK R&D-claim compliance has been the subject of HMRC enforcement focus post-2023 with an Additional Information Form (AIF) requirement and compliance check focus on agent-prepared claims.

What R&D regimes exist in other major jurisdictions?

France: Crédit d'impôt recherche (CIR) at 30 percent on the first EUR 100 million of qualifying R&D expenditure + 5 percent above. Refundable for SMEs; reportable for larger entities. Among the most generous R&D incentives in the OECD. Germany: Forschungszulage at 25 percent of qualifying R&D salaries + contract research up to EUR 12 million per year (post-2024 reform from prior EUR 4 million cap). Operates as a wage-based subsidy rather than expenditure credit. Italy: Crediti d'imposta R&S at variable rates by activity type (10-25 percent on qualifying expenditure). Patent Box regime under Article 6 Legislative Decree 146/2021 provides 110 percent enhanced deduction for qualifying IP-linked R&D spend. Australia: R&D Tax Incentive — 43.5 percent refundable offset for groups with aggregated turnover under AUD 20 million; non-refundable tiered offset (8.5/16.5 percent intensity-tiered above AUD 50 million expenditure floor) for larger groups. Canada: Scientific Research and Experimental Development (SR&ED) tax credit at 35 percent refundable for CCPCs (first CAD 3 million) + 15 percent non-refundable above. Singapore: 250 percent enhanced deduction for qualifying R&D under the Enhanced Tax Deduction scheme. South Korea: R&D Tax Credit at 25-50 percent for SMEs depending on activity-stage classification.

How do R&D incentives interact with Pillar Two?

The OECD Pillar Two Global Anti-Base Erosion (GloBE) framework introduces a 15 percent minimum effective tax rate for in-scope multinational groups (consolidated revenue >EUR 750m). R&D tax incentives that reduce the effective tax rate below 15 percent in a jurisdiction trigger top-up tax under the Income Inclusion Rule, Undertaxed Profits Rule, or Qualified Domestic Minimum Top-up Tax mechanisms — substantially reducing the marginal benefit of aggressive R&D-based ETR reduction for large MNE groups. The OECD Inclusive Framework guidance on Qualified Refundable Tax Credits (QRTCs) treats certain refundable R&D credits as additional income (rather than tax reduction) for Pillar Two computation purposes — preserving the incentive value at the GloBE-floor calculation. Non-refundable R&D credits or non-QRTC-compliant credits may reduce the GloBE-effective tax rate, triggering top-up tax. Major-economy R&D incentives have been progressively redesigned post-2022 to maintain QRTC status — UK RDEC was structured as above-the-line specifically to qualify; France CIR has long-term QRTC structure. The post-2024 OECD GloBE Administrative Guidance continues to refine R&D-incentive treatment.

What documentation and compliance requirements apply?

Most major-economy R&D-credit regimes impose substantial documentation requirements. US: contemporaneous documentation under Treas. Reg. §1.41-4(d) required for the four-part test on each qualifying activity; QRE calculation supporting workpapers; Form 6765 filing with the corporate return. The 2022 Schedule M-3 changes added compliance burden. UK: Additional Information Form (AIF) mandatory from 8 August 2023 for all R&D claims, including a project-narrative section and detailed QRE breakdown. Pre-Notification Form required for first-time claimants since 1 April 2023. France: detailed Bordereau (claim form) plus technical narrative for each project; Comité Consultatif du Crédit d'Impôt Recherche pre-clearance available. Germany: BSFZ (Bescheinigungsstelle Forschungszulage) prior-certification required for qualifying R&D project status — among the most procedurally rigorous R&D-credit gatekeepers globally. Australia: AusIndustry registration mandatory before the R&D Tax Incentive can be claimed, with project-eligibility review separate from ATO claim review. Canada: SR&ED claims filed via Form T661 with project narratives; CRA technical-and-financial review at substantial scrutiny levels. The compliance burden is heaviest for new claimants and for cross-border-R&D arrangements where contract-research treatment varies by jurisdiction.