The Test Claimants in the FII Group Litigation v HM Revenue and Customs

Factual and Procedural Background

This opinion concerns the lengthy and complex litigation relating to the Franked Investment Income ("FII") group litigation order ("GLO") originally made in the Chancery Division of the High Court in October 2003, involving UK-resident companies within the British American Tobacco ("BAT") group. The litigation began over a decade prior to the current trial, including multiple references to the European Court of Justice ("ECJ") and several stages of trial and appeal in the High Court, Court of Appeal, and Supreme Court. The ECJ provided key rulings in 2006, 2012, and 2013 clarifying the unlawfulness of certain UK tax charges under EU law.

Following the Supreme Court and ECJ rulings invalidating statutory limitation provisions, the trial resumed to determine remaining issues of liability and quantification for the BAT test claims and two additional test claims from the Ford group and the GKN group, which raised factual matters relevant to quantification. The trial, conducted in 2014, was managed with an agreed statement of facts, a comprehensive list of issues, and was informed by prior judgments in related group litigations.

The factual background includes detailed agreed data on qualifying distributions, tax payments, and applicable UK tax rates, supplemented by expert evidence. Particular attention is given to the calculation of unlawful Schedule D Case V corporation tax ("Case V charge") and Advance Corporation Tax ("ACT") on dividends paid by foreign subsidiaries to UK parent companies, with issues arising from complex corporate structures, participation exemptions, and special tax regimes in various jurisdictions.

The procedural history includes multiple appeals and cross-appeals, references to the ECJ for preliminary rulings, and detailed case management directions to facilitate the quantification trial. The claims concern amounts dating back to 1973 and involve enormous sums and important questions of EU and domestic law.

Legal Issues Presented

1. In what respects was the Case V charge unlawful under EU law?
2. What is the appropriate foreign nominal tax rate ("FNR") to be applied for credit purposes?
3. How should special cases, such as participation exemptions, mixer companies, and foreign tax regimes, be treated in calculating the FNR and credits?
4. How should the lawful Case V charge be computed, including questions of grossing up and the treatment of withholding tax ("WHT")?
5. Does EU law require credit against ACT for underlying foreign tax as well as for tax at the FNR?
6. Does EU law require credit against ACT for WHT?
7. How is the lawful ACT to be calculated?
8. How is the FNR for ACT credit to be determined?
9. What methodology should be used to link ACT paid by UK companies with EU-source income?
10. How should foreign income dividends ("FIDs") be treated for ACT claims?
11. How should unlawful ACT be treated in terms of utilisation within the group?
12. How should the carry back of excess franked investment income ("FII") within a single accounting period be treated?
13. Under the CT61 method, how should EU section 231 credits be attributed to quarterly ACT payments?
14. Must credit for foreign corporation tax on branch profits be given against ACT?
15. Does the existence of a non-resident parent entitled to double taxation treaty credits affect the restitution due?
16. Do any further adjustments need to be made to the claimants' calculations?
17. Is the defence of change of position available to the Revenue in respect of mistake-based claims?
18. Is the Revenue's argument that they were not enriched by the interaction between ACT and shareholder tax credits precluded by EU law?
19. Why is change of position not available as a defence to Woolwich claims?
20. Is change of position available as a defence to the claimants' mistake claims as a matter of English law?
21. Have the Revenue made out a defence of change of position on the facts?
22. If entitled under English law, is the defence of change of position precluded by EU law?
23. Is the Revenue's "actual benefit" argument available under English law?
24. If available, is the "actual benefit" argument made out on the facts?
25. Is the "actual benefit" argument permitted by EU law?
26. What is the measure of restitution due to the claimants?
27. If interest is payable, should it be simple or compound interest?
28. What interest rates and compounding periods are appropriate?
29. In respect of which periods do the claimants have valid Woolwich claims?
30. When did the claimants discover or could with reasonable diligence have discovered their mistake?
31. What is the quantum of restitution to which the BAT claimants are entitled?

Arguments of the Parties

The opinion does not contain a detailed account of the parties' legal arguments.

Table of Precedents Cited

Court's Reasoning and Analysis

The court undertook a detailed legal and factual analysis of the BAT group litigation concerning the unlawfulness of the UK Schedule D Case V corporation tax charge and Advance Corporation Tax ("ACT") on dividends paid by foreign subsidiaries to UK parent companies, in breach of EU law.

On the unlawfulness of the Case V charge, the court reaffirmed the requirement established by the ECJ that a compliant hybrid tax system must grant a dual credit: for the actual foreign underlying tax paid and for the foreign nominal tax rate (FNR), capped at the UK nominal rate. The court rejected the Revenue's submission that only a single credit at the FNR is required, explaining that the ECJ's jurisprudence consistently supports the dual credit approach.

Regarding the appropriate FNR, the court concluded that the relevant FNR is that of the jurisdiction where the profits were actually subject to tax, rather than simply the water's edge company paying the dividend. For complex corporate structures such as mixer companies and participation exemptions, the court preferred the claimants' approach, which builds on existing UK tax machinery and respects the actual blending of income streams, over the Revenue's disaggregation methodology.

In computing the lawful Case V charge, the court held that the credit at the FNR should be applied to the income as originally calculated without grossing up at the FNR, and that credit for withholding tax (WHT) should be taken into account symmetrically in both the actual and lawful tax calculations to avoid mismatches.

For ACT, the court accepted that EU law similarly requires credit for both underlying foreign tax and the FNR. It rejected the Revenue's methodology, which ignored underlying tax and assumed a hypothetical ACT rate higher than the actual UK rate, as conceptually flawed and inflating the lawful ACT charge.

On linking ACT with EU-source income, the court preferred the claimants' "CT61" method, which adapts the operation of the UK ACT system to trace EU tax credits through the corporate group, over the Revenue's complex and assumption-laden "tracing" methodology. The court also rejected the claimants' alternative "FID" method as conceptually flawed and limited in temporal scope.

In relation to foreign income dividends ("FIDs"), the court held that the FID regime breached EU law and that claims for the time value of ACT paid under the FID regime are recoverable separately and in full, without applying the Revenue's tracing methodology.

On the defence of change of position, the court held that it is not available as a defence to Woolwich claims, grounded in unlawful tax levies, due to overriding public policy considerations (the stultification principle). The defence is in principle available to mistake-based claims, but the court found that on the facts the Revenue failed to establish the defence. Moreover, EU law precludes reliance on change of position as a defence to San Giorgio claims, leaving unjust enrichment of the taxpayer as the sole defence.

The Revenue's argument that they were not enriched by unlawful ACT receipts due to their obligation to grant tax credits to shareholders was rejected. The court found that the Revenue were enriched at the date of receipt of the money and its time value, regardless of the statutory linkage between ACT payments and tax credits.

Regarding the measure of restitution, the court held that claimants are entitled to recover (i) the full principal sums of unlawfully paid Case V tax and unutilised ACT, (ii) the time value of prematurely paid or utilised ACT measured by compound interest, and (iii) the time value of the amounts recoverable under (i) and (ii) from payment until restitution. The Revenue's attempt to limit restitution to the actual benefit derived was rejected as inconsistent with EU law and the principle of effectiveness.

On interest, the court held that compound interest is the appropriate measure of the time value of money, rejecting arguments that retrospective compounding is not established or that simple interest under section 35A of the Senior Courts Act 1981 applies. The court applied a reasonable proxy for the cost of government borrowing, based on a moving average of ten-year gilt yields compounded semi-annually.

On limitation, the court held that Woolwich claims are subject to a six-year limitation period from the date of payment, making claims for payments on or after 18 June 1997 available. The mistake claims benefit from an extended limitation period under section 32(1)(c) of the Limitation Act 1980, with time beginning to run no earlier than 8 March 2001 (the ECJ's Hoechst judgment), or alternatively 25 October 2006 (the House of Lords decision in DMG).

Holding and Implications

The court's final decision is that the claimants are entitled to recover in full the unlawfully levied Case V corporation tax and ACT, including the principal sums and the time value of prematurely paid or utilised ACT, calculated by compound interest using an appropriate government borrowing rate measure.

HOLDING: The claimants' claims for restitution of unlawful tax and related interest are upheld in principle, with the court rejecting the Revenue's alternative methodologies and defences, including the defence of change of position and the argument based on the Revenue's actual benefit.

Implications: This decision confirms the legal principles governing the quantification of unlawful tax claims under EU law, including the dual credit requirement for foreign tax, the appropriate measure of restitution, and the limited scope of defences available to the Revenue. It emphasizes the necessity for compound interest to provide an adequate indemnity and affirms the extended limitation period for mistake-based claims. The ruling affects the parties directly by establishing the framework for calculation of restitution but does not create new precedent beyond the careful application of established EU and domestic law principles.