Mortgagee’s interest insurance

Category: Marine insurance · Reviewed by the Apex broking team · Last reviewed 2026-08-22 · ~3 min read

The problem it solves

A ship financier normally protects itself by requiring the borrower to insure the vessel, by taking an assignment of the policy, and by being named as loss payee and often as additional assured. That works while the owner’s policy responds. It fails completely when the policy does not — and the reasons a marine policy fails are usually the owner’s doing: breach of warranty, non-disclosure, unseaworthiness with the owner’s privity, failure to pay premium, breach of a trading limit or class requirement, or a scuttling or fraud allegation.

In those situations the assignment gives the lender nothing, because there is nothing to assign. Loss payee status does not improve on a policy that has been avoided or that has no liability to pay. The security is worth exactly as much as the owner’s compliance, which is what the bank was trying not to depend on.

What MII does

MII sits behind the owner’s cover and responds to the mortgagee’s own loss. In broad terms, four elements have to line up: the vessel has suffered loss or damage of a kind that the owner’s hull or war risks policies would ordinarily cover; those policies have not paid, or have paid less than they should have, because of a breach, act, omission or other matter on the part of the owner; the mortgagee did not know of and did not consent to that matter; and the mortgagee has suffered loss because the debt is not repaid.

The cover is normally written by reference to the outstanding indebtedness rather than to the vessel’s insured value, which is the clearest signal that it is the lender’s interest being insured and not the ship. The market form most commonly encountered is the Institute Mortgagees’ Interest Clauses Hulls (CL337, dated 1 March 1997), which is used with or without amendment across most ship finance MII placements.

How the English court has read the standard form

The standard wording went unconsidered by the English courts for a long time. That changed in Oceanus Capital SARL v Lloyd’s Insurance Company SA (The Vyssos) [2025] EWHC 3293 (Comm), a decision of the Commercial Court in December 2025 which is understood to be the first English judgment construing the Institute Mortgagees’ Interest Clauses Hulls. The court construed the wording in the assured mortgagee’s favour on the coverage question; permission to appeal was granted, so the position may develop further.

The practical lesson for lenders is not the outcome but the fact of the dispute: a form in wide use for nearly thirty years reached its first English construction only recently, and MII wordings should be read on their own terms rather than assumed to work.

Related and adjacent covers

MII is often placed alongside a related cover addressing additional perils — broadly, the risk of the vessel being confiscated, seized, expropriated or detained, or lost through pollution-related liabilities, in circumstances the primary covers exclude. Terminology and scope vary between markets and brokers, so the additional perils element should be read as drafted rather than assumed from its label.

Separately, MII does not do the job of the owner’s liability cover. Third-party liabilities remain with the owner’s P&I club, and the lender’s protection in respect of those is usually a co-assured or note of interest arrangement with the club rather than MII.

The non-marine parallel

The same structural problem exists in property finance, and is usually solved differently. A commercial property policy will often carry a mortgagee protection clause under which the insurer agrees not to treat the lender’s interest as prejudiced by the borrower’s act or omission, provided the lender notifies and pays premium when asked. That is a contractual accommodation within the owner’s policy rather than a separate policy for the lender, and its protection depends entirely on the clause being in the wording and the lender complying with it.

Where a lender’s exposure is significant and the borrower’s compliance cannot be relied on, a standalone lender’s interest policy is the equivalent of MII. In either case the point is the same: an interest noted on someone else’s policy is not the same as insurance of your own.

Why it matters

For a financier, MII is the difference between security that depends on the borrower’s good behaviour and security that does not. The premium is small relative to the exposure precisely because the cover only bites where something has already gone wrong with the primary programme — but that is also why the trigger wording, the definition of the mortgagee’s knowledge and consent, and the interaction with the loss payee provisions repay careful reading before the facility is drawn rather than after a casualty.

Frequently asked questions

Who buys mortgagee's interest insurance?

The mortgagee — usually the bank or finance house holding the ship mortgage. It is the lender's own policy, insuring the lender's interest in being repaid, and it is normally paid for by the borrower under the facility documentation.

How is MII different from being named loss payee on the owner's policy?

Loss payee status only directs payment under a policy that responds. If the owner's policy has been avoided, or does not pay because of the owner's breach, there is nothing to direct. MII is a separate contract that responds precisely in that situation.

What is the standard MII wording?

Most ship finance MII is placed on the Institute Mortgagees' Interest Clauses Hulls (CL337, 1 March 1997), with amendments. That form was construed by the English Commercial Court for the first time in Oceanus Capital SARL v Lloyd's Insurance Company SA (The Vyssos) [2025] EWHC 3293 (Comm).

Is there an equivalent for property lending?

Usually a mortgagee protection clause within the borrower's own property policy, under which the insurer agrees the lender's interest is not prejudiced by the borrower's act or omission. Where that is not available or not enough, a standalone lender's interest policy performs the same function as MII.

Related entries

• Hull insurance
• Marine insurance
• Marine insurance act 1906
• Protection and indemnity club
• Marine liability insurance

This entry is part of the Apex Insurance Wiki. It is general insurance information, not legal advice, and states the position as at August 2026. Last reviewed 2026-08-22. Next review: 2027-02-22. Always read the policy wording and take advice on your own facts.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This page is general information, not advice on a specific policy.