A charter party agreement is the contract between a shipowner and a charterer that governs the commercial use of a vessel, covering who controls the ship, who pays which costs, and who bears the risk when something goes wrong. The structure you choose decides how much of the vessel’s operation sits on your side of the ledger, and the specific terms inside the contract decide what happens when loading runs late, cargo is damaged, or a payment is missed. Disputes over these agreements fall under federal admiralty jurisdiction, meaning they are heard in federal district court under 28 U.S.C. § 1333 rather than state court.1Office of the Law Revision Counsel. 28 USC 1333 – Admiralty, Maritime, and Prize Cases
The Four Main Types
Charter parties fall into four structures, distinguished by how much operational control passes to the charterer.
Voyage Charter
A voyage charter hires the vessel for a single trip or a series of consecutive trips between specified ports. The charterer pays “freight,” calculated either per ton of cargo or as a lump sum. The shipowner keeps operational control and covers crew wages and fuel. BIMCO’s GENCON form, first developed in 1922 and most recently updated in 2022, is the most widely used voyage charter in the dry bulk sector.2BIMCO. GENCON 2022
Time Charter
A time charter gives the charterer the vessel for a fixed period, from a few months to several years. The charterer pays “hire” at regular intervals and picks up the voyage-related costs: fuel, port charges, pilotage, canal dues.3U.S. Securities and Exchange Commission. Form of Refrigerated Vessel Time Charters The shipowner still owns the ship, employs the crew, and handles maintenance and insurance. You get flexibility to direct the vessel without actually running it.
Bareboat (Demise) Charter
A bareboat charter hands over almost everything. The shipowner delivers the hull, and the charterer crews, fuels, maintains, repairs, and insures the vessel at its own expense.4U.S. Securities and Exchange Commission. BARECON 2017 Standard Bareboat Charter Party The crew become the charterer’s employees for all purposes, even if the shipowner originally hired them. BIMCO’s BARECON form, last updated in 2017, is the standard template.5BIMCO. BIMCO Contracts Financial exposure is substantially higher than under a time or voyage charter because the charterer is effectively the operator.
Slot Charter
A slot charter buys a set number of container slots on a vessel rather than the whole ship. The slot charterer typically acts as the carrier for the goods in that space, issuing its own bills of lading and handling cargo claims. There is no control over the vessel’s commercial employment or navigation. This structure is common in container shipping, where several charterers share space on one sailing.
Terms the Contract Has to Nail Down
Gaps and ambiguity in a handful of core terms are where most disputes begin.
Vessel, Cargo, and Trading Area
The contract identifies the vessel by name, flag state, and deadweight tonnage.6U.S. Securities and Exchange Commission. Form of Time Charter for Container Vessels Cargo descriptions have to be specific enough to prevent safety problems and to settle later arguments about whether the goods matched what was agreed. Loading and discharge ports define the geographic scope, and any trading-area restrictions (war zones, sanctioned countries, ice-bound waters) belong in the same place.
Laytime
Laytime is the window the shipowner agrees to keep the vessel available for loading or unloading without charging anything beyond the freight.7BIMCO. Laytime Definitions for Charter Parties 2013 It is expressed as a set number of hours or days, and the clock starts once a valid Notice of Readiness is tendered. Getting the laytime calculation right determines when demurrage kicks in.
Standard Forms
Most charter parties start from an industry template, not a blank page. BIMCO publishes forms for each charter type, and using them gives both sides pre-vetted language that has been through decades of arbitration and litigation. Shipbrokers who arrange the fixture earn a commission calculated as a percentage of the freight or hire.
What Each Side Owes
A charter party creates continuing duties on both sides, and failing to meet them can trigger breach claims, hire suspensions, or withdrawal of the vessel.
Seaworthiness and Cargoworthiness
The shipowner must provide a vessel fit to sail safely to its destination. Seaworthiness covers physical structure, equipment, manning, and documentation for the specific voyage, and the standard is relative: what is seaworthy for a short coastal trip is not necessarily seaworthy for a transoceanic winter crossing. The vessel must also be “cargoworthy,” meaning the holds are physically suitable for the particular goods. Contaminated holds, faulty ventilation, or residue from previous cargoes can all breach this duty. Unless a bareboat charter has shifted operational responsibility, the owner handles routine maintenance and ensures the crew meets international qualification standards.
Safe Ports and Honest Cargo
The charterer is responsible for ordering the vessel only to ports it can reach, use, and leave without unavoidable danger. Physical hazards (uncharted shallows, extreme weather, inadequate berths) and political risks (armed conflict, terrorism) can both make a port unsafe. The charterer also has to ensure the cargo actually matches the contract description; loading undeclared hazardous materials or exceeding weight limits creates safety problems and liability.
Paying on Time
Paying hire or freight on time is not housekeeping. Under standard BIMCO terms, if a hire payment is overdue, the shipowner must notify the charterer within 24 hours and give 72 hours to cure. If payment still has not arrived, the owner can withdraw the vessel within the next 12 hours.8BIMCO. Non-Payment of Hire Clause for Time Charter Parties 2006 Withdrawal pulls the ship out from under the charterer and can strand cargo. An owner who chooses not to withdraw over one late payment does not waive the right to withdraw over the next one.
Demurrage, Despatch, and Deadfreight
Voyage charters build in three financial mechanisms tied to how efficiently loading and discharge actually run.
Demurrage. When loading or unloading takes longer than the agreed laytime, the charterer owes demurrage. The rate is fixed at the time the charter is agreed and expressed as a daily figure, pro-rated for partial days. The formula is days on demurrage multiplied by the daily rate. The rate itself varies dramatically with market conditions, vessel size, and trade route. Demurrage accrues automatically once laytime expires, so the charterer has a strong incentive to keep port operations moving.
Despatch. Despatch is the mirror image: the shipowner pays the charterer a reward for finishing early. The despatch rate is conventionally half the demurrage rate, though the parties can agree to something else. Despatch is mainly a dry cargo concept and rarely appears in tanker or gas charters.
Deadfreight. If the charterer commits to a cargo quantity and fails to deliver all of it, the owner can claim deadfreight for the shortfall. If the charter party has a specific deadfreight formula, that controls. If it does not, the measure is the lost freight minus whatever expenses the owner saved by not carrying the extra cargo. The owner is expected to make reasonable efforts to find replacement cargo, but any substitute freight earned does not reduce the deadfreight claim.
Off-Hire in Time Charters
Off-hire clauses let the charterer stop paying hire when the vessel cannot perform its intended service for reasons that are the owner’s responsibility. These clauses appear in virtually every time charter. Under the widely used NYPE form, standard off-hire events include:
- Crew shortages: any numerical gap in required officers or crew.
- Mechanical breakdown of hull, machinery, or equipment that a prudent operator would address in port.
- Damage to the vessel, unless caused by the charterer’s use.
- Average accidents, meaning detention from events normally covered by the owner’s insurance.
- Arrest or legal seizure of the vessel, unless the charterer caused it.
Some charter parties use broad “any other cause whatsoever” wording that captures events beyond the listed ones. Others confine off-hire to events of the same kind as those named. The broader version shifts more downtime risk onto the owner, and the wording is negotiated carefully.
Cargo Liability: COGSA and the Harter Act
Two federal statutes shape liability for lost or damaged cargo, and charter parties often bring one or both in through a “paramount clause.”
The Carriage of Goods by Sea Act (COGSA) caps a carrier’s liability at $500 per package, or per customary freight unit for unpackaged goods, unless the shipper declares a higher value before loading and inserts it into the bill of lading.9Office of the Law Revision Counsel. 46 USC 30701 – Definition The parties can agree to a higher cap but cannot drop below $500. If the shipper fraudulently misstates the cargo’s nature or value, the carrier is not liable at all. COGSA applies by its own force to goods moving between U.S. and foreign ports, and the parties can extend its coverage by contract to periods and trades it would not otherwise reach.
The Harter Act fills the gap on either side of the voyage, governing the carrier’s responsibilities before cargo is loaded and after it is discharged.9Office of the Law Revision Counsel. 46 USC 30701 – Definition Together the two create a continuous liability framework over the full journey. Under both, the carrier’s duty is framed as “due diligence” to make the vessel seaworthy; perfection is not required, and negligence is not excused.
Arbitration and Maritime Liens
Most charter party disputes never reach a courtroom. Standard forms send disagreements to arbitration, with New York, London, Singapore, and Hong Kong as the primary seats. BIMCO’s Law and Arbitration Clause has versions tailored to each.10BIMCO. Law and Arbitration Clause 2020 New York For New York, the contract specifies three arbitrators (unless the parties agree otherwise) and requires proceedings to follow the rules of the Society of Maritime Arbitrators.11Society of Maritime Arbitrators, Inc. SMA Model Arbitration Clause Awards can be entered as a rule of the court, giving them enforcement power comparable to a judicial decision.
A shipowner owed freight, demurrage, or other amounts under the charter party may be able to detain the cargo until the debt is paid, even when the cargo belongs to a third party. The lien right can come from an express clause or an implied common-law lien. The GENCON 2022 form, for example, gives the owner a lien on cargo and sub-freights for unpaid freight, demurrage, general average contributions, salvage, and damages. For that lien to reach cargo moving under a separate bill of lading, the charter party’s lien clause has to be properly incorporated into the bill, expressly or by reference. Botched incorporation is one of the more common reasons lien enforcement fails.
Activating the Agreement: Notice of Readiness
Once terms are settled, the parties sign and the charterer typically makes an initial hire payment or security deposit. Clean copies go to the master, port agents, and both sides’ brokers.
The contract moves from paper to live operation when the vessel arrives at the loading port and the master issues a Notice of Readiness. The NOR does two things: it tells the charterer the vessel is at the agreed location and ready for cargo operations, and it starts the laytime clock.12West P&I. Defence Guide – Notice of Readiness The NOR has to accurately reflect that the vessel is both at the contractual location and genuinely ready to begin. A premature or defective NOR can be rejected, which delays the laytime trigger and puts the cost of the lost time on the owner. With demurrage running into thousands of dollars per day, the timing and validity of the NOR carry far more weight than the document’s simplicity suggests.