Business Management · Professional negligence

Duty of Care in Professional Negligence: Neighbour Principle and Caparo Test

Updated 11 October 2026 · Fact-checked

A duty of care is a legal obligation to take reasonable care so that your acts or advice do not harm others. A claimant must first prove it exists. Courts use the neighbour principle from Donoghue v Stevenson and the Caparo test: foreseeability, proximity, and whether imposing a duty is fair, just and reasonable.

Understand Duty of Care in Professional Negligence

Negligence is a civil wrong (a tort). To win, a claimant must prove three things: the defendant owed a duty of care, the defendant breached it, and the breach caused damage that is not too remote. This page covers only the first element: duty.

The starting point is the neighbour principle from Donoghue v Stevenson (1932). Lord Atkin said you must take reasonable care to avoid acts or omissions you can reasonably foresee would injure your "neighbour". Your neighbours are people so closely and directly affected by your act that you ought to have them in mind. The case itself involved a manufacturer and a consumer with no contract between them. It showed that duty does not need a contract.

The neighbour principle is very broad. Later courts found it too wide for cases like pure economic loss or advice. In Caparo Industries v Dickman (1990), the House of Lords set out a three-stage test for new situations. The harm must be reasonably foreseeable. There must be a relationship of proximity between the parties. It must be fair, just and reasonable to impose a duty. Later cases suggest courts now prefer to build on existing categories by analogy and use Caparo mainly for novel situations. Say this if the question invites it.

For professionals, duty to a client is usually easy. It arises from the retainer and from the professional taking on the work, and often runs alongside a contract. The harder question is duty to third parties who relied on the advice. For negligent statements causing financial loss, Hedley Byrne v Heller (1964) is the key case. Duty can arise where the professional assumes responsibility, the third party reasonably relies on the advice, and the professional knew or should have known the advice would be relied on for a particular purpose. A valid disclaimer can prevent that assumption of responsibility.

For an actuary, this matters when advice goes beyond the client. Examples are a valuation report seen by trustees, regulators or a buyer of a business. Ask who the actuary knew would rely on the work, and for what purpose. These legal principles come from English law. Indian courts follow the law of torts largely through English precedent, so apply them as the IAI material presents them. Keep your answer to the principles and the facts given.

Key rules to remember

Elements of negligence: Negligence = duty of care + breach of duty + causation of damage (not too remote); Duty comes first. If no duty exists, the claim fails and you need not discuss the rest.
Neighbour principle (Donoghue v Stevenson): Duty owed to those you can reasonably foresee would be harmed by your act or omission, because they are closely and directly affected; Gives the general idea of duty. It is not a full test on its own for modern cases.
Caparo three-stage test: 1. Reasonable foreseeability of harm; 2. Proximity of relationship; 3. Fair, just and reasonable to impose a duty; All three must be satisfied. Apply it mainly in novel situations.
Negligent misstatement (Hedley Byrne): Duty if: assumption of responsibility + reasonable reliance + advice given for a known purpose and likely to be relied on; Used for advice causing pure financial loss, including to third parties. A clear disclaimer can negate it.

How to solve Duty of Care in Professional Negligence questions

Use this order for any problem question on whether a professional owed a duty. Link each step to the facts given.

1Identify the claimant and defendant, and the harm suffered. Is it physical injury, property damage or pure financial loss?
2Decide if the claimant is the client or a third party. A client duty usually follows from the retainer or contract.
3If the duty is established or obvious, say so briefly and move on. Do not over-argue it.
4For a third party, state the relevant test: neighbour principle, Caparo, and Hedley Byrne if the loss came from advice.
5Apply foreseeability: could the professional foresee that this claimant would be harmed or rely on the work?
6Apply proximity and the assumption of responsibility: did the professional know the purpose, the recipient and the likely reliance? Note any disclaimer.
7Apply fair, just and reasonable: consider policy, such as indeterminate liability to an unlimited class.
8Conclude clearly: a duty is likely or unlikely. Note that breach and causation are separate questions.

Quickest way: Three-question duty check

When to use it: Use for MCQs and short written parts where you have little time.

Ask: was the harm foreseeable?
Ask: was the relationship close, with known purpose and reliance?
Ask: is it fair and reasonable to impose liability, or does it open the floodgates?
If the claim is for advice, add: did the professional assume responsibility, and was there a disclaimer?
Write the conclusion in one sentence and name the case behind each point.

Common mistakes in Duty of Care in Professional Negligence

Treating the neighbour principle as the only test.
Donoghue v Stevenson is the most famous case, so students stop there.
Fix: Use it as background, then apply Caparo's three stages to new or doubtful situations.
Dropping the third Caparo stage.
Foreseeability and proximity seem enough, and fair, just and reasonable feels vague.
Fix: Always write one line on policy, for example the risk of liability to an unlimited group.
Assuming a contract is needed for a duty.
Students mix up contract and tort.
Fix: State that a duty in tort can exist without a contract, as Donoghue v Stevenson shows.
Saying a professional owes a duty to everyone who reads their advice.
Foreseeability is confused with proximity.
Fix: Limit duty to those the professional knew would rely on the advice for a known purpose, as in Hedley Byrne.
Mixing duty with breach and causation.
Facts about poor work tempt students to say the duty was broken before proving it existed.
Fix: Deal with duty as a separate heading and finish it before you discuss standard of care.
Ignoring a disclaimer in the facts.
Students skim the facts for the negligent act.
Fix: Check for disclaimers or stated limits on who may rely. They can stop responsibility being assumed.

Worked examples

Example 1

An actuary is hired by a company's trustees to prepare a funding valuation. The actuary knows the report will be shown to a bank that is deciding whether to lend to the sponsoring employer. The report has no disclaimer. The bank lends, relies on a careless error and suffers loss. Did the actuary owe the bank a duty of care?

Show the solution

Identify the parties: the bank is a third party with no contract with the actuary. The loss is pure financial loss from advice.
State the test: negligent misstatement under Hedley Byrne, supported by Caparo's three stages.
Foreseeability: the actuary knew the bank would see the report and lend, so loss from error was foreseeable.
Proximity and assumption of responsibility: the actuary knew the specific recipient and the purpose, lending. Reliance was reasonable. There was no disclaimer to prevent this.
Fair, just and reasonable: liability is to a known recipient for a known purpose, not to an unlimited class, so it is fair to impose a duty.
Conclude and note that breach and causation must still be proved.

Answer: A duty of care was very likely owed to the bank, because the actuary knew the bank would rely on the report for a known purpose and had not disclaimed responsibility. The claim then depends on proving breach and causation.

Example 2

Using the same facts, suppose the actuary's report was included in a public annual report. An investor who bought shares after reading it lost money because of the error. The report said it was prepared only for the trustees. Does the investor have a duty claim?

Show the solution

Identify the investor as a third party suffering pure financial loss from advice.
Apply Caparo stage 1: some loss to investors might be foreseeable in a general way.
Apply stage 2: the actuary did not know of this investor or this purpose. The report said it was only for the trustees, so the actuary did not assume responsibility to investors.
Apply stage 3: imposing a duty would expose the actuary to claims from an unlimited and unknown class, for an unlimited time. This is not fair, just and reasonable.
Conclude that the proximity and policy stages fail.

Answer: The investor is unlikely to establish a duty of care. There was no proximity or assumed responsibility, the report limited its purpose, and a duty to an unlimited class would not be fair, just and reasonable.

Exam tips

In problem questions, start with a short statement of the test, then spend most of your words applying it to the facts.
Name the case with its point: Donoghue v Stevenson for the neighbour principle, Caparo for the three stages, Hedley Byrne for negligent advice. Do not add cases you are unsure of.
Compare client and third-party facts. Examiners often change who relied on the advice, and the purpose, to test proximity.
For MCQs, remember that all three Caparo stages must be met, and a contract is not required for a duty in tort.
Keep duty separate from breach and causation. Write one clear conclusion on duty before moving on.

Practice questions from Professional negligence

Duty of Care in Professional Negligence in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

ACCA Strategic ProfessionalAudit Negligence and Duty of Care

Duty of Care in Professional Negligence: frequently asked questions

What is the Caparo test for duty of care?

It has three stages: the harm must be reasonably foreseeable, there must be proximity between the parties, and it must be fair, just and reasonable to impose a duty. All three must be satisfied. It comes from Caparo Industries v Dickman.

What is the neighbour principle in Donoghue v Stevenson?

You must take reasonable care to avoid acts or omissions you can reasonably foresee would injure your neighbour. Your neighbours are those closely and directly affected by what you do. It showed a duty can exist without a contract.

Does a professional owe a duty of care to third parties?

Sometimes. For advice causing financial loss, a duty can arise if the professional assumed responsibility, knew the purpose, and the third party reasonably relied on the advice. A clear disclaimer can prevent this.

Do I need a contract to claim for professional negligence?

No, a claim in tort does not need a contract. A client often has both contract and tort claims. A third party with no contract may still claim if a duty of care existed.