For an owner or a charterer moving dry bulk cargo, one of the first commercial decisions is not which vessel to fix, but which type of contract to fix it under. Voyage charter and time charter are the two principal structures used to buy and sell dry bulk tonnage, and each allocates cost, risk and control between the parties in a different way. The distinction matters well before a fixture is agreed, because it shapes how freight is calculated, who carries the cost of an idle vessel, and how much flexibility either side retains. This article sets out the practical difference between the two structures and the considerations that typically guide a choice between spot voyage coverage and period tonnage.
Voyage charter: paying for the passage
Under a voyage charter, the charterer pays for the carriage of a specified cargo from a load port to a discharge port, usually expressed as freight. The owner remains responsible for running the vessel and meeting the associated operating costs, while the charterparty sets out laytime and demurrage provisions to allocate the risk of delay in loading and discharging without either party carrying open-ended exposure to time in port.
Because the owner keeps commercial control of the vessel once the voyage is complete, a voyage charter suits cargo that moves occasionally, or a relationship that has not yet developed into a regular flow. The charterer buys transport for a single cargo, without taking on responsibility for what the vessel does before or after.
Time charter: hiring the vessel itself
A time charter works differently. The charterer hires the vessel, complete with crew, for an agreed period and directs its commercial employment within the limits set by the charterparty, such as trading areas and permitted cargoes. Hire is paid for the use of the vessel, and the charterer typically also bears bunkers and port costs incurred during the period.
That arrangement shifts the burden of keeping the vessel employed onto the charterer. If no cargo is available for a leg of the period, hire is still due. In exchange, the owner gains a more predictable revenue stream for the duration of the charter, at the cost of day-to-day commercial flexibility over how the vessel is used.
Where the two structures differ
The clearest difference lies in how cost is packaged. A voyage charter bundles transport into a single freight figure covering one cargo movement. A time charter separates hire from voyage costs, so the charterer is directly exposed to bunker consumption and port disbursements for as long as the vessel is on hire.
The two structures also divide risk differently. A voyage charter leaves employment risk after the voyage with the owner, while transferring cargo-specific risk around loading and discharging to the charterer through laytime and demurrage. A time charter transfers employment risk to the charterer for the length of the period, while the owner retains responsibility for the vessel's seaworthiness, crewing and maintenance throughout.
Spot voyage coverage or period tonnage
The choice between the two often comes down to the shape of the cargo programme. A one-off or irregular cargo movement is usually best covered on a spot voyage basis, matching a specific vessel to a specific shipment as the need arises. A programme of regular volumes over a longer horizon tends to suit period tonnage under time charter, since it secures vessel availability in advance and gives both sides a firmer basis for planning.
Risk appetite plays a role as well. Spot voyage coverage means renegotiating terms with every fixture, which brings flexibility but also repeated exposure to prevailing market conditions. Period tonnage removes that repetition and gives more visibility over cost and availability, but it commits the charterer to hire for the length of the period regardless of how their own cargo needs evolve. Neither approach is inherently preferable; the right one depends on the cargo profile and the degree of commitment each party is prepared to make.
Blending both approaches
In practice, many owners and charterers run a mixed programme rather than relying on a single structure. A base level of volume might be covered on period tonnage of a defined size and type, such as Panamax or geared bulkers suited to ports without shore cranes, with spot voyage fixtures used to cover surplus cargo or to take advantage of opportunities as they arise.
Working out which instrument fits a given cargo, route and counterpart relationship is where a broker's market view is most useful. Route and commodity characteristics, covered in more detail in our piece on commodities and routes, often influence whether spot or period cover makes more sense for a particular trade. Commercial practice varies from one fixture to the next, so it is always worth checking the specific terms of the charterparty rather than relying on general assumptions.
Whether a cargo movement calls for spot voyage coverage or a period fixture is rarely a fixed answer; it shifts with trade patterns, tonnage availability and each client's own commercial plans. The desks at ER Drybulk, working from Rotterdam, are available to talk through voyage and time charter options for a given dry bulk requirement, independently and in confidence.