Marine Insurance Act 1906

The Marine Insurance Act 1906 is the foundational codification of English marine insurance law, drafted by Sir Mackenzie Chalmers and still in force, but substantially amended by the Insurance Act 2015 in respect of disclosure, warranties and remedies.

Definition §

The Marine Insurance Act 1906 ("MIA 1906" or "the 1906 Act") is the statutory codification of English marine insurance law, drafted by Sir Mackenzie Chalmers and based on his earlier work codifying the law of sale of goods and bills of exchange. The Act came into force on 1 January 1907 and remains in force, though substantially modified by the Insurance Act 2015 in respect of disclosure and warranties.^[1]

Although ostensibly limited to marine insurance, the 1906 Act has had a much wider influence: many of its principles — particularly those on disclosure, materiality, warranties and the duty of utmost good faith — were applied by the courts to non-marine insurance by analogy, and ultimately came to govern almost all classes of English insurance. This made the 1906 Act, in practical effect, the general statute of English insurance law for over a century.^[2]

The Act is organised around four principal areas: contract formation and good faith (sections 17 to 21); the indemnity principle and valuation (sections 67 to 73); warranties and other implied terms (sections 33 to 41); and the substantive marine insurance regime, including total and partial loss, abandonment and salvage. Parts of the Act remain unaltered, while other parts — notably sections 18 to 20 on disclosure and representations, and aspects of sections 33 to 41 on warranties — have been largely repealed or modified for non-consumer contracts by the Insurance Act 2015.^[3]

Legal / Regulatory basis §

The Marine Insurance Act 1906 was enacted following extensive consultation in the marine insurance market, drawing on existing case law, custom and the practices of Lloyd's. Section 1 defines a contract of marine insurance as one by which the insurer undertakes to indemnify the assured against marine losses incident to marine adventure.

Section 17 contains the famous statement that "a contract of marine insurance is a contract based upon the utmost good faith, and, if the utmost good faith be not observed by either party, the contract may be avoided by the other party." The duty of utmost good faith was extended to non-marine insurance by analogy and became one of the defining features of English insurance law until its modernisation by the 2015 Act.^[4]

Section 18 imposed the original duty of disclosure: the assured must disclose to the insurer, before the contract is concluded, every material circumstance which is known to the assured, and the assured is deemed to know every circumstance which, in the ordinary course of business, ought to be known by him. This absolute duty was the subject of long-standing criticism for producing disproportionate outcomes, and was largely repealed for non-consumer contracts by the Insurance Act 2015 Schedule 2 paragraph 5.^[5]

Section 19 contained an additional duty on agents effecting insurance to disclose material circumstances known to them. Section 20 dealt with representations by the assured. Both have been substantially modified by the 2015 Act for non-consumer contracts.

Sections 33 to 41 governed warranties. Section 33 defined the nature of a warranty and the consequences of breach; section 39 set out the implied warranty of seaworthiness in voyage policies. These sections remain in force, but the consequences of breach of warranty are now modified by sections 10 and 11 of the Insurance Act 2015 for all classes of insurance.^[6]

The leading 20th and 21st century cases on the duty of utmost good faith — including The Star Sea (Manifest Shipping Co Ltd v Uni-Polaris Insurance Co Ltd) and Pan Atlantic Insurance Co Ltd v Pine Top Insurance Co Ltd — were decided on the basis of the 1906 Act framework. These authorities remain important for interpreting the surviving sections of the 1906 Act and for understanding the legacy of pre-2015 case law.^[7]

How it works in practice §

In practice, the 1906 Act now operates as a layered statute. Parts of it — including the indemnity principle, valuation provisions, total and partial loss rules, abandonment and salvage — continue to apply unmodified to marine insurance. Other parts — including disclosure, representations, and the legal consequences of warranty breach — have been substantially overlaid by the 2015 Act for non-consumer contracts entered into on or after 12 August 2016, and by the 2012 Act for consumer contracts.

For non-consumer insurance, the practical effect is that:

• Sections 18 to 20 (disclosure and representations) are largely replaced by sections 3 to 8 of the Insurance Act 2015 (duty of fair presentation and proportionate remedies).
• Sections 33 to 34 (warranties) continue to govern the definition and creation of warranties, but the consequences of breach are now governed by sections 10 and 11 of the Insurance Act 2015 (suspensive effect; protection from non-relevant breaches).
• Section 17 (utmost good faith) is no longer a freestanding ground for avoidance; section 14 of the Insurance Act 2015 abolishes the use of utmost good faith as a basis for avoiding a contract.^[8]

For consumer insurance, the Consumer Insurance (Disclosure and Representations) Act 2012 has replaced sections 18 to 20 with a duty to take reasonable care not to make a misrepresentation. The 2012 Act came into force on 6 April 2013 and applies to all consumer insurance contracts.^[9]

The 1906 Act continues to be the primary source of substantive marine insurance law in England — for example, in relation to constructive total loss, abandonment and the implied warranty of seaworthiness. Marine practitioners must therefore work with both statutes: the 1906 Act for substantive marine doctrine and the 2015 Act for pre-contractual duties and warranty consequences.

Common variations §

The relationship between the 1906 Act and the 2015 Act varies by contract type and date. For contracts entered into before 12 August 2016, the 1906 Act remains the primary framework subject to any consumer protections. For contracts entered into on or after that date, the 2015 Act overrides the 1906 Act on disclosure and warranty consequences but the 1906 Act continues to apply to substantive marine doctrine.

For non-marine insurance, the 1906 Act was applied by analogy throughout the 20th century, particularly in property and liability lines. Many of the leading non-marine insurance cases — including The Star Sea and Pan Atlantic — were decided as marine cases but applied to all classes. The 2015 Act has therefore had a wider practical effect than the title of the 1906 Act might suggest.

For reinsurance, the 1906 Act applied where the reinsurance contract was treated as a marine contract; otherwise it applied by analogy. The 2015 Act now provides the principal framework for non-consumer reinsurance, with the 1906 Act surviving for substantive marine doctrine.

International marine insurance contracts may incorporate other regimes — for example, US, German or Scandinavian marine insurance law — depending on the choice of law. The 1906 Act applies as a matter of English law and is also frequently the chosen governing law in international contracts because of its established jurisprudence.

Example §

A vessel sailing under an English-law marine policy issued in March 2026 suffers damage during a transatlantic voyage. The owner notifies the insurer. The insurer alleges that the master failed to disclose at inception that the vessel had previously been laid up for an extended period. Under the 2015 Act (rather than the 1906 Act), the question of disclosure is governed by sections 3 to 8 of the Insurance Act 2015 — was the laid-up period a material circumstance that the insured knew or ought to have known, and did the insurer rely on its non-disclosure?

If non-disclosure is established, the proportionate remedies framework in Schedule 1 applies, not the absolute avoidance remedy under the unmodified 1906 Act. However, the substantive marine insurance questions — whether the loss is a particular average, whether the implied warranty of seaworthiness applies, the assessment of indemnity — are still governed by the 1906 Act.

See also §

• /wiki/insurance-act-2015/ — the modernising statute
• /wiki/fair-presentation-of-the-risk/ — replaces section 18 disclosure
• /wiki/material-circumstance/ — modernised materiality test
• /wiki/warranty-insurance/ — sections 33-41 historical framework
• /wiki/warranty-to-suspensive-condition/ — section 10 reform
• /wiki/consumer-insurance-disclosure-and-representations-act-2012/ — consumer regime
• /wiki/inducement/ — Pan Atlantic test

References §

1. ↑ Marine Insurance Act 1906, https://www.legislation.gov.uk/ukpga/Edw7/6/41
2. ↑ Marine Insurance Act 1906; commentary on the wider application of marine principles to non-marine insurance: Law Commission and Scottish Law Commission, "Insurance Contract Law: Business Disclosure; Warranties; Insurers' Remedies for Fraudulent Claims; and Late Payment" (Law Com No 353 / Scot Law Com No 238, July 2014), https://lawcom.gov.uk/
3. ↑ Insurance Act 2015, Schedule 2 (amendments to Marine Insurance Act 1906), https://www.legislation.gov.uk/ukpga/2015/4
4. ↑ Marine Insurance Act 1906, section 17
5. ↑ Marine Insurance Act 1906, section 18; Insurance Act 2015, Schedule 2
6. ↑ Marine Insurance Act 1906, sections 33-41
7. ↑ The Star Sea (Manifest Shipping Co Ltd v Uni-Polaris Insurance Co Ltd) [2001] UKHL 1, [2003] 1 AC 469; Pan Atlantic Insurance Co Ltd v Pine Top Insurance Co Ltd [1995] 1 AC 501 (HL)
8. ↑ Insurance Act 2015, sections 10, 11 and 14
9. ↑ Consumer Insurance (Disclosure and Representations) Act 2012, https://www.legislation.gov.uk/ukpga/2012/6