HMF is an important U.S. import cost term for businesses moving cargo by sea. It commonly appears on ocean shipments entering the United States and can affect total landed cost, customs planning, and import budgeting.
Harbor Maintenance Fee definition
HMF, or Harbor Maintenance Fee, is a U.S. fee assessed on certain commercial cargo moved by vessel through covered ports. In simple terms, HMF is an ocean-import charge tied to port use. For most importers, it is calculated as a percentage of cargo value and collected as part of the customs and entry process for qualifying vessel shipments.
What does HMF mean in shipping?
In shipping, HMF stands for Harbor Maintenance Fee. Importers most often encounter it when cargo arrives in the U.S. by ocean vessel through ports subject to the fee.
Because the acronym “HMF” can mean different things in other contexts, this glossary page focuses specifically on the U.S. Harbor Maintenance Fee used in ocean freight and import compliance.
How Harbor Maintenance Fee works
HMF is tied to vessel-based port use. In practice, the fee is commonly assessed on qualifying imported commercial cargo that is unloaded from a commercial vessel at a covered U.S. port.
- Cargo arrives by ocean vessel: the shipment enters the U.S. through a covered port.
- Port use triggers the fee: the vessel-based movement falls within HMF rules.
- The value basis is applied: the fee is calculated using the applicable cargo value basis.
- HMF becomes part of import cost: the charge is included in the import and compliance process.
How is HMF calculated?
Harbor Maintenance Fee is generally calculated at 0.125% of the applicable cargo value for qualifying commercial vessel shipments. That makes it a small percentage charge, but it can still matter for high-value imports or frequent ocean shipments.
Because import costs add up across duties, fees, freight, and accessorials, even small percentage-based charges can affect total landed cost planning.
When does Harbor Maintenance Fee apply?
HMF generally applies to qualifying ocean freight cargo moved through covered U.S. ports. Importers usually do not deal with HMF on air freight, which is why the term is most relevant for containerized or vessel-based imports.
For businesses moving goods internationally by sea, Dedola’s ocean freight services can help connect transportation planning with the fees and compliance details that affect shipment cost.
Who pays Harbor Maintenance Fee?
For cargo entering the United States, the liable party is generally the importer. That is why HMF matters most to importers reviewing entry costs, freight quotes, and landed-cost assumptions for ocean shipments.
HMF vs MPF: what is the difference?
HMF and MPF are both U.S. import-related charges, but they are not the same.
- HMF: tied to qualifying port use involving commercial cargo on a vessel.
- MPF: a separate merchandise processing charge tied to customs entry processing.
Importers often see both in landed-cost discussions, especially when reviewing total customs-related charges on ocean imports.
Why HMF matters for importers
HMF matters because it directly affects the total cost of importing by ocean. Even though the percentage is relatively small, it can become meaningful across repeated shipments, large cargo values, or tight-margin products.
- Impacts landed cost calculations
- Matters for ocean-import budgeting
- Should be considered alongside duties and MPF
- Can influence sourcing and shipment-mode decisions
Companies that want better visibility into freight cost drivers often benefit from broader supply chain planning instead of reviewing transportation charges one by one after the fact.
What does Harbor Maintenance Fee fund?
The Harbor Maintenance Fee supports the Harbor Maintenance Trust Fund, which is used in connection with harbor and channel maintenance for the U.S. navigation system. That is the policy reason the fee exists in the first place: linking vessel-based commercial port use with federal harbor-maintenance funding.
Common HMF terms importers should know
- HMF: Harbor Maintenance Fee.
- Port Use: the vessel-related port activity that triggers the fee under the applicable rules.
- Commercial Cargo: cargo moved on a commercial vessel and evaluated under the relevant HMF rules.
- HMTF: Harbor Maintenance Trust Fund.
- MPF: Merchandise Processing Fee, a separate U.S. import fee.
Harbor Maintenance Fee FAQ
What is HMF in simple terms?
HMF is the Harbor Maintenance Fee, a U.S. fee commonly charged on qualifying commercial cargo arriving by ocean vessel through covered ports.
What does HMF stand for?
HMF stands for Harbor Maintenance Fee.
How much is Harbor Maintenance Fee?
Harbor Maintenance Fee is generally calculated at 0.125% of the applicable cargo value for qualifying vessel shipments.
Does HMF apply to air freight?
No. HMF is associated with qualifying vessel-based port use, so importers usually encounter it on ocean freight rather than air freight.
