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SQE – Equity and Trust – Mixing of Trust Funds With Funds of Another Innocent Party and the Rule in Roscoe v Winder
Introduction
An important issue in equitable tracing arises where trust funds are mixed not with the trustee’s personal money, but with funds belonging to another innocent party. This may occur where a trustee improperly combines:
However, tracing through mixed accounts is also subject to important limitations, particularly the rule in Roscoe v Winder, which limits tracing claims to the lowest intermediate balance remaining in the account after withdrawals have occurred.
The General Rule: Pari Passu Distribution
The general rule established in cases such as Re Diplock and Foskett v McKeown is that innocent contributors share proportionately in the mixed fund or substitute asset.
This proportional sharing is commonly described as:
pari passu
or:
rateable distribution.
Each innocent contributor therefore receives a proportionate share corresponding to the amount originally contributed to the mixed fund.
The courts refuse to prioritise one innocent claimant over another because all contributors are equally deserving of equitable protection.
Meaning of Pari Passu
“Pari passu” means that innocent contributors share proportionately in:
Case Scenario
Assume Daniel improperly mixes money belonging to two separate trusts into a single bank account.
Trust A
Contributes:
£200,000.
Trust B
Contributes:
£300,000.
Total Mixed Fund
£500,000.
Daniel then uses the mixed fund to purchase an investment property.
The property later increases in value and becomes worth:
£1 million.
The beneficiaries seek recovery of their respective interests.
Application of the Pari Passu Principle
Since both Trust A and Trust B are innocent contributors, equity treats them equally and allocates ownership proportionately according to their original contributions.
Ownership Shares
Trust A
Contribution:
£200,000
= 40% of the mixed fund.
Trust B
Contribution:
£300,000
= 60% of the mixed fund.
Result
Trust A
Receives:
40%
= £400,000.
Trust B
Receives:
60%
= £600,000.
Tenants in Common
Where innocent contributors elect to take the substitute asset itself, they become:
tenants in common
with ownership shares proportionate to their contributions.
This principle was recognised in Sinclair v Brougham. Each party therefore acquires a separate beneficial interest corresponding to the amount contributed.
Sharing Losses
The pari passu principle also applies where the substitute asset decreases in value.
Suppose the property purchased for:
£500,000
later falls in value to:
£250,000.
The loss is shared proportionately.
Result
Trust A
40%
= £100,000.
Trust B
60%
= £150,000.
Why?
Because equity treats innocent contributors equally in relation to both gains and losses.
The Rule in Roscoe v Winder
An important limitation upon tracing through mixed accounts is the rule in James Roscoe (Bolton) Ltd v Winder.
The rule provides that beneficiaries cannot trace into sums exceeding:
the lowest intermediate balance
remaining in the account after the trust money was mixed.
Meaning of the Rule
Where withdrawals reduce the account balance below the amount originally contributed, equity assumes that trust money has been dissipated to that extent.
Later deposits do not automatically replenish the missing trust money unless:
Roscoe v Winder Example
Assume:
£100,000.
However, under Roscoe v Winder, the beneficiaries may generally trace only into:
✅ £20,000,
because this represented the:
lowest intermediate balance.
The later £80,000 deposit does not automatically restore dissipated trust money.
Relationship Between Pari Passu and Roscoe v Winder
The pari passu principle determines:
✅ how innocent contributors share remaining assets proportionately.
The rule in Roscoe v Winder determines:
✅ the maximum amount still capable of being traced.
Thus, even where innocent contributors share proportionately, their overall recovery may still be limited by depletion of the account balance.
Relationship With Other Tracing Rules
These principles operate alongside other important tracing doctrines.
Re Hallett
Where trustees mix trust funds with personal money, equity presumes that trustees spend personal funds first.
Re Oatway
Where investments are purchased from mixed funds, beneficiaries may trace into the purchased asset.
Roscoe v Winder
Limits tracing to the lowest intermediate balance remaining after withdrawals.
Innocent Contributor Cases
Where all contributors are innocent:
✅ proportional sharing applies.
Practical Importance
These doctrines are highly important in modern tracing litigation involving:
Key SQE Principles
Innocent Contributors
Where trust funds are mixed with money belonging to another innocent party:
✅ pari passu distribution applies.
Roscoe v Winder
Tracing claims are limited to:
✅ the lowest intermediate balance.
Tenancy in Common
Innocent contributors may become:
✅ tenants in common
with proportional ownership shares.
Sources of Reference
Cases
Foskett v McKeown [2001] 1 AC 102 (HL).
James Roscoe (Bolton) Ltd v Winder [1915] 1 Ch 62.
Re Diplock [1948] Ch 465.
Sinclair v Brougham [1914] AC 398 (HL).
Books
Alastair Hudson, Equity and Trusts (11th edn, Routledge 2022).
James Penner, The Law of Trusts (12th edn, OUP 2020).
Graham Virgo, The Principles of Equity and Trusts (5th edn, OUP 2024).
John McGhee (ed), Snell’s Equity (35th edn, Sweet & Maxwell 2024).
Conclusion
Where trust funds are mixed with funds belonging to another innocent party, equity generally applies proportional or pari passu distribution so that all innocent contributors share fairly in both gains and losses. Where substitute assets are purchased, the parties may become tenants in common with ownership shares proportionate to their contributions. However, tracing rights remain subject to important limitations such as the rule in Roscoe v Winder, which restricts recovery to the lowest intermediate balance remaining after withdrawals from the mixed account. Together, these doctrines form a central part of modern equitable tracing law and demonstrate equity’s attempt to balance fairness, proprietary protection, and practical financial realities.
Introduction
An important issue in equitable tracing arises where trust funds are mixed not with the trustee’s personal money, but with funds belonging to another innocent party. This may occur where a trustee improperly combines:
- money from two separate trusts;
- trust money with money belonging to another beneficiary;
- or funds belonging to multiple innocent contributors.
However, tracing through mixed accounts is also subject to important limitations, particularly the rule in Roscoe v Winder, which limits tracing claims to the lowest intermediate balance remaining in the account after withdrawals have occurred.
The General Rule: Pari Passu Distribution
The general rule established in cases such as Re Diplock and Foskett v McKeown is that innocent contributors share proportionately in the mixed fund or substitute asset.
This proportional sharing is commonly described as:
pari passu
or:
rateable distribution.
Each innocent contributor therefore receives a proportionate share corresponding to the amount originally contributed to the mixed fund.
The courts refuse to prioritise one innocent claimant over another because all contributors are equally deserving of equitable protection.
Meaning of Pari Passu
“Pari passu” means that innocent contributors share proportionately in:
- profits;
- losses;
- substitute assets;
- and increases in value.
Case Scenario
Assume Daniel improperly mixes money belonging to two separate trusts into a single bank account.
Trust A
Contributes:
£200,000.
Trust B
Contributes:
£300,000.
Total Mixed Fund
£500,000.
Daniel then uses the mixed fund to purchase an investment property.
The property later increases in value and becomes worth:
£1 million.
The beneficiaries seek recovery of their respective interests.
Application of the Pari Passu Principle
Since both Trust A and Trust B are innocent contributors, equity treats them equally and allocates ownership proportionately according to their original contributions.
Ownership Shares
Trust A
Contribution:
£200,000
= 40% of the mixed fund.
Trust B
Contribution:
£300,000
= 60% of the mixed fund.
Result
Trust A
Receives:
40%
= £400,000.
Trust B
Receives:
60%
= £600,000.
Tenants in Common
Where innocent contributors elect to take the substitute asset itself, they become:
tenants in common
with ownership shares proportionate to their contributions.
This principle was recognised in Sinclair v Brougham. Each party therefore acquires a separate beneficial interest corresponding to the amount contributed.
Sharing Losses
The pari passu principle also applies where the substitute asset decreases in value.
Suppose the property purchased for:
£500,000
later falls in value to:
£250,000.
The loss is shared proportionately.
Result
Trust A
40%
= £100,000.
Trust B
60%
= £150,000.
Why?
Because equity treats innocent contributors equally in relation to both gains and losses.
The Rule in Roscoe v Winder
An important limitation upon tracing through mixed accounts is the rule in James Roscoe (Bolton) Ltd v Winder.
The rule provides that beneficiaries cannot trace into sums exceeding:
the lowest intermediate balance
remaining in the account after the trust money was mixed.
Meaning of the Rule
Where withdrawals reduce the account balance below the amount originally contributed, equity assumes that trust money has been dissipated to that extent.
Later deposits do not automatically replenish the missing trust money unless:
- the trustee intended specifically to restore the trust funds;
or - the later deposits themselves represent traceable proceeds of the original trust property.
Roscoe v Winder Example
Assume:
- trust money of £100,000 is deposited into a mixed account;
- withdrawals reduce the account balance to £20,000;
- the trustee later deposits £80,000 of personal money.
£100,000.
However, under Roscoe v Winder, the beneficiaries may generally trace only into:
✅ £20,000,
because this represented the:
lowest intermediate balance.
The later £80,000 deposit does not automatically restore dissipated trust money.
Relationship Between Pari Passu and Roscoe v Winder
The pari passu principle determines:
✅ how innocent contributors share remaining assets proportionately.
The rule in Roscoe v Winder determines:
✅ the maximum amount still capable of being traced.
Thus, even where innocent contributors share proportionately, their overall recovery may still be limited by depletion of the account balance.
Relationship With Other Tracing Rules
These principles operate alongside other important tracing doctrines.
Re Hallett
Where trustees mix trust funds with personal money, equity presumes that trustees spend personal funds first.
Re Oatway
Where investments are purchased from mixed funds, beneficiaries may trace into the purchased asset.
Roscoe v Winder
Limits tracing to the lowest intermediate balance remaining after withdrawals.
Innocent Contributor Cases
Where all contributors are innocent:
✅ proportional sharing applies.
Practical Importance
These doctrines are highly important in modern tracing litigation involving:
- collective investment schemes;
- pension funds;
- insolvency;
- fraud;
- and mixed trust accounts.
Key SQE Principles
Innocent Contributors
Where trust funds are mixed with money belonging to another innocent party:
✅ pari passu distribution applies.
Roscoe v Winder
Tracing claims are limited to:
✅ the lowest intermediate balance.
Tenancy in Common
Innocent contributors may become:
✅ tenants in common
with proportional ownership shares.
Sources of Reference
Cases
Foskett v McKeown [2001] 1 AC 102 (HL).
James Roscoe (Bolton) Ltd v Winder [1915] 1 Ch 62.
Re Diplock [1948] Ch 465.
Sinclair v Brougham [1914] AC 398 (HL).
Books
Alastair Hudson, Equity and Trusts (11th edn, Routledge 2022).
James Penner, The Law of Trusts (12th edn, OUP 2020).
Graham Virgo, The Principles of Equity and Trusts (5th edn, OUP 2024).
John McGhee (ed), Snell’s Equity (35th edn, Sweet & Maxwell 2024).
Conclusion
Where trust funds are mixed with funds belonging to another innocent party, equity generally applies proportional or pari passu distribution so that all innocent contributors share fairly in both gains and losses. Where substitute assets are purchased, the parties may become tenants in common with ownership shares proportionate to their contributions. However, tracing rights remain subject to important limitations such as the rule in Roscoe v Winder, which restricts recovery to the lowest intermediate balance remaining after withdrawals from the mixed account. Together, these doctrines form a central part of modern equitable tracing law and demonstrate equity’s attempt to balance fairness, proprietary protection, and practical financial realities.
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