Undue Influence in Irish Contract Law

Undue influence is one of the "vitiating factors" — the doctrines that let a party escape a contract because their consent was defective. It sits next to duress and unconscionable bargain on a spectrum of unfair dealing. Duress is overt pressure — a threat. Undue influence is subtler: there is no need for a threat at all, only a relationship that has been used so that the weaker party's will was not truly their own. Because it is an equitable doctrine, it is discretionary and can be lost by delay.

Actual vs presumed undue influence

Traditionally the doctrine is split into actual and presumed undue influence. The better modern view — accepted in Royal Bank of Scotland v Etridge (No 2) Persuasive (Eng) — is that these are not two different wrongs but two ways of proving the same thing: that the transaction was not the product of the complainant's free will.

Actual undue influence

Here the complainant proves directly that improper pressure was applied, so that the transaction "was not the result of the free exercise of the will of the donor" — the language used by Shanley J in the Irish case Carroll v Carroll Binding (IE). It is rare, but it is established: the classic illustration is a person coerced by threats to prosecute a close relative. For actual undue influence the complainant does not need to show the transaction was to their manifest disadvantage — it is treated as "a species of fraud" (CIBC Mortgages v Pitt Persuasive (Eng)).

Presumed undue influence

More often, the complainant does not prove pressure directly but raises a presumption, shifting the burden onto the other party to show the transaction was a free, informed act — usually by proving the complainant had real independent advice. There are two ways to raise it.

The relationships that automatically raise the presumption

Certain relationships are treated by law as relationships of influence, so the presumption arises without proof (the complainant still needs a transaction that is not readily explicable on ordinary motives). These include:

• Parent and child — McMackin v Hibernian Bank; Carroll v Carroll IE
• Trustee and beneficiary — Provincial Bank v McKeever IE
• Religious adviser and follower — Whyte v Meade IE; Allcard v Skinner Eng
• Solicitor and client, doctor and patient, guardian and ward

Notice what is not on the list: husband and wife is not an automatic category. That matters enormously for the bank-guarantee cases below. Allcard v Skinner also shows the doctrine needs no bad motive — a religious gift was presumptively set aside despite no pressure beyond the community's own rules, precisely because the influence would be impossible to prove directly.

The rebuttal almost always turns on independent advice — but that advice must be genuine. As the Irish courts put it, independent advice is "a shield, not a mere cloak" (McMackin). In Carroll v Carroll a frail, dependent father's transfer of his pub to his son was set aside because the "independent" advice was inadequate — the solicitor knew nothing of the family's circumstances (Denham J).

When the facts (not the relationship) raise the presumption

Where no listed relationship applies, a complainant can still raise the presumption by proving, as a fact, a relationship of trust and confidence plus a transaction that calls for explanation. The leading Irish authority is Prendergast v Joyce Binding (IE), where a recently-widowed, vulnerable elderly woman's transfers to her nephew were set aside — there is no automatic aunt/nephew presumption, but the facts raised it, and "advice" from a bank official with a financial interest was not independent.

Gilligan J in Prendergast restated the three criteria (drawn from Carroll) worth memorising:

• one party was at a serious disadvantage (poverty, age, ignorance, ill-health);
• the transaction was at an undervalue; and
• there was a lack of independent advice.

Undue influence and bank guarantees — the surety cases

This is where undue influence earns most of its exam marks. The problem: the wrongdoer (say, a husband pressuring his wife) is often not a party to the contract that is challenged — the challenged contract is a guarantee given to a bank. The bank did nothing wrong itself. When is the bank nonetheless affected?

The English starting point is Barclays Bank v O'Brien Persuasive (Eng): a creditor is bound only if the undue influence can be imputed to it through actual or constructive notice. A bank is "put on inquiry" where the relationship between the surety and the debtor is non-commercial (this is why "husband and wife" not being an automatic category still matters — the non-commercial relationship is what puts the bank on inquiry), and it must then take reasonable steps, chiefly urging independent legal advice (the Etridge guidelines).

The Irish position is more restrained than England's. In Ulster Bank v Roche Binding (IE) Clarke J applied a two-stage test — (1) was the surety actually under undue influence? and (2) did the bank have actual or constructive notice? — but pointedly declined to import "the full rigours" of the UK regime. Crucially, the Irish courts insist on stage one first: unless the surety can show actual undue influence (or misrepresentation) by the debtor, a bank has no free-standing duty to ensure the surety got independent advice (Bank of Ireland v Curran; ACC Loan Management v Connolly IE). Get the jurisdictional order of play right and this becomes an easy issue to spot.

Remedies and time limits

Once undue influence is established the transaction is set aside. This is an "all-or-nothing" remedy — the court will not rewrite the deal down to what the victim would have agreed (Allied Irish Bank v Byrne). Because it is equitable, it is subject to laches: the victim must act within a reasonable time after the influence has ended, or the right to rescind is lost (Allcard v Skinner; Carroll v Carroll).