In today’s shipping industry, chartering is often conducted through a series of so-called “back-to-back” contracts. But are they really?
This article explores what “back-to-back” means in practice, the loopholes that exist, and how members can avoid pitfalls.
Understanding Back-to-Back Charterparties: Key Risks and Considerations for Members
In today’s complex chartering landscape, vessels are often fixed under a chain of charterparties, typically involving a head owner, intermediate charterers, and sub-charterers. These arrangements are often referred to as “back-to-back,” implying that the contract terms align seamlessly. But in practice, “back-to-back” is often more of an assumption than a reality.
This article explores the true meaning of “back-to-back” in practice, highlights common loopholes, and provides guidance on how members can protect their interests.
What are back-to-back charterparties?
Back-to-back charterparties typically refer to a situation where one party (usually an intermediate charterer) enters into two contracts: one as a charterer (under the head charterparty) and one as a disponent owner (under the sub-charterparty), with the aim of making the terms and obligations mirror each other. This structure is designed to seamlessly pass obligations and responsibilities down the chain.
However, unless the terms are carefully aligned, even minor inconsistencies can lead to significant gaps, leaving the intermediate party as an unintended buffer between conflicting obligations.
In this article, the term “back-to-back” primarily refers to situations where both parties are time charterparties. While voyage charterparties may contain clauses reflecting the terms of a time charterparty in the chain, by their nature, they cannot be truly back-to-back. In a voyage charter, the owner bears the navigation risk and receives freight for carrying a specific cargo; whereas in a time charter, the charterer controls the vessel’s employment and bears operational costs and delay losses. Therefore, while a voyage charter can be drafted on terms similar to a time charter, it cannot be fully back-to-back due to the different allocation of risks, responsibilities, and costs. Nevertheless, the following includes relevant information on voyage charterparties to illustrate the risks members may face in a charterparty chain.
Key Risks and Clause Mismatches
1
/Berth Safety Warranties
Safe /berth warranties are common in time charterparties, but the wording may differ (e.g., one requiring due diligence, the other an absolute warranty) or may be absent. If the head charter contains a warranty but the sub-charter does not, the intermediate charterer may be liable for an unsafe port claim with no contractual recourse.
Furthermore, in the absence of explicit safety clauses, courts appear to take different approaches to implying a safe port term depending on the circumstances.
For example, in a voyage sub-charter, if the voyage is between specific ports and does not contain an express safe port warranty, it is unlikely that an implied warranty exists that the charterer is responsible for port safety, as the owner has had the opportunity to consider the safety of the nominated ports. Similarly, if a voyage contract lists several possible /discharge ports from which the charterer can choose the actual port, an automatic implied safe /berth warranty will not arise in the absence of an express promise. Any such implied term would only arise if it is necessary to give the charterparty business efficacy.
In contrast, in a time charter, the charterer controls the vessel’s employment and decides where the vessel goes. To give the charterparty commercial efficacy, courts may in some circumstances imply a safe port term.
Therefore, while courts may imply a safe port warranty based on the contract, relying on judicial interpretation rather than clear express terms increases litigation risk and uncertainty.
2
Bunker Specifications and Quality
Disputes related to bunkers can escalate quickly. To mitigate risk, fuel specification clauses in all charterparties (e.g., ISO 8217 compliance, sulphur content under MARPOL Annex VI, and suitability for the vessel’s machinery) must be consistent.
If bunker responsibilities and dispute resolution procedures differ, intermediate charterers may face risks with no clear path to recover losses.
3
Stevedore Damage and Third-Party Injury
In many standard time charterparties (such as NYPE), the charterer assumes responsibility for cargo operations, including loading, stowing, trimming, and discharging, usually “at their risk and expense.” This means that damage to cargo caused by stevedores, or personal injury to stevedores and shore personnel, may fall entirely on the charterer.
In a “back-to-back” charter chain, these responsibilities and associated indemnity or insurance requirements must be mirrored in the sub-charter. If the sub-charter omits these clauses or allocates responsibility differently, the intermediate charterer may be liable under the head charter with no recourse under the downstream contract.
Such gaps can lead to significant exposure, especially in jurisdictions with high compensation for third-party personal injury claims or strict liability regimes.
Ensuring consistency and precise wording of clauses throughout the charter chain, including clear provisions on stevedore responsibility, damage reporting, and conduct, is key to protecting members from disproportionate liability.
4
Clause Paramount and Time Bars
The Clause Paramount incorporates vital protections from the Hague or Hague-Visby Rules into charterparties, including the one-year time bar for cargo claims. Its purpose is to ensure the carrier’s rights, obligations, and liabilities for cargo loss or damage are governed by these mandatory rules, even if the voyage or contract would not otherwise fall under their scope. If included in one charterparty but omitted in another, timing conflicts can arise.
For example, a sub-charterer might present a claim outside the one-year period allowed by the head charter, leaving the intermediate party unable to seek recovery.
Other time bars may also differ. Some voyage charters may stipulate 6 or 12-month time bars for cargo claims, while the Inter-Club Agreement (ICA) specifies a 24-month notification time bar.
5
Inter-Club Agreement (ICA)
The ICA is crucial for cargo liability apportionment in time charters. However, clauses such as “claims settled as per ICA” can be overly vague. Charterers must expressly and accurately incorporate the latest version of the ICA (now ICA 2025) and state that it takes precedence over conflicting terms. (See Club Circulars for ICA 2025)
Failure to do so can lead to disputes over liability apportionment and even the enforceability of the ICA itself.
It is also noteworthy that voyage charterparties generally do not contain ICA clauses, meaning cargo claims in these scenarios may fall entirely outside the ICA framework. Members should be particularly vigilant when a voyage charter follows a time charter containing ICA clauses.
6
Governing Law and Jurisdiction Clauses
Differences in law and arbitration clauses can lead to procedural complexity and expensive parallel litigation. For example, an English-law LMAA arbitration clause in the head charter and a US law clause (potentially under COGSA) in the sub-charter may require separate legal actions in different jurisdictions.
To avoid this, members should ensure consistency in dispute resolution clauses across the charter chain, including specifying the arbitration body, applicable law, number and qualifications of arbitrators, and time bars.
7
Hold Cleanliness, Speed and Performance, Force Majeure
Operational clauses often differ in language, scope, and standards. Varying requirements for hold cleanliness (e.g., grain vs. “hospital clean” standards), speed and performance warranties, and definitions of force majeure can create confusion and delays – especially when a vessel is immediately re-fixed or involves intermediate voyages.
Common issues include:
• Delivery disputes due to inconsistent cleaning standards or inspection protocols.
• Conflicts in off-hire or laytime calculations.
• Unclear demurrage rights.
8
Financial Risks
i. Cost Exposure in Charterparty Chain Arbitrations
In charterparty chain arbitrations, costs awards can place an intermediate party in a particularly vulnerable position. Even if successful in arbitration, an intermediate charterer may be unable to recover its costs and the costs awarded against it in a losing arbitration.
When facing a claim, the intermediate charterer needs to carefully consider its options before commencing proceedings up and down the chain. A full set of counter-appointed arbitrators is not always necessary and can, even where the charterer is seemingly not at fault, result in significant unrecoverable costs. For more insights, please see our article – ‘Costs Recovery In Charterparty Chain Arbitrations: Costs Recovery In Charterparty Chain Arbitrations’
ii. Financial Risk from Default
Beyond procedural risks, the financial stability of parties in the charter chain must never be overlooked. Default by the head charterer due to insolvency or breach can lead to the termination or suspension of the entire charter chain.
The intermediate charterer may still be obligated to perform under one contract but unable to do so under the other. This can lead to severe financial consequences, including unpaid hire, damages for failure to perform, or prolonged idleness.
What Should Members Look Out For?
Understand the risks of being an intermediate charterer: The intermediate charterer position is inherently risky unless managed carefully.
Ensure symmetry: Key clauses must be synchronized across all charterparties in the chain, covering liability, time bars, operational standards, and applicable law.
Avoid vague references: Terms like “as per head charter” or “as per ICA,” without the actual clause text or adequate specification, can lead to interpretation disputes.
Review sub-charter terms early: Do not assume brokers or counterparties will automatically align terms.
Conclusion
Back-to-back charterparties offer commercial flexibility but require careful drafting and a clear understanding of liability flow. Members should not rely on assumptions or abbreviated references but should take proactive steps to ensure contracts are consistent and enforceable.
