U.S. cargo preference requirements are federal laws that force goods owned, procured, or financed by the U.S. government to move on American-flag vessels, at percentages ranging from 50 to 100 percent depending on the cargo type. The rules reach every federal agency, prime contractor, subcontractor, and aid organization that ships by sea, and they carry civil penalties, False Claims Act exposure, and debarment risk for anyone who ignores them. Compliance turns on four things: knowing which percentage applies to your cargo, using a vessel that actually qualifies as U.S.-flag, getting a MARAD waiver before ever loading on a foreign ship, and filing the required shipment reports on time.
What Cargo Is Covered and at What Percentage
The percentage split depends on who owns the goods and where the money comes from.
Military Cargo: 100 Percent
The Military Cargo Preference Act of 1904 requires that all supplies purchased for or transported by the Department of Defense move on U.S.-flag vessels or vessels belonging to the United States. There is no percentage split. The Secretary of Defense may grant a waiver only when no domestic vessel is available at a fair and reasonable rate, and each waiver must be reported to Congress at least once per fiscal year.1Office of the Law Revision Counsel. 10 USC 2631 – Preference for United States Vessels in Transporting Supplies by Sea
Civilian and Government-Financed Cargo: 50 Percent
The Cargo Preference Act of 1954 covers a much wider set of shipments: anything the government procures for its own account, furnishes to a foreign country without reimbursement, or finances through federal funds, loans, or credit guarantees. At least 50 percent of the gross tonnage must travel on privately owned U.S.-flag commercial vessels, calculated separately for dry bulk carriers, dry cargo liners, and tankers, and only to the extent domestic vessels are available at fair and reasonable rates.2Office of the Law Revision Counsel. 46 USC 55305 – Cargoes Procured, Furnished, or Financed by the United States Government
Agricultural commodities shipped under food aid programs fall under the same 50 percent rule. One point that trips shippers up: the percentage is measured across an entire program within a calendar year, not shipment by shipment. A food aid program can move some individual cargoes on foreign-flag ships as long as its annual tonnage totals hit 50 percent on U.S.-flag carriage.
Export-Import Bank Shipments
Public Resolution 17, enacted in 1934, imposes a separate set of cargo preference obligations on Ex-Im-financed goods. Not every Ex-Im transaction triggers them. They cover direct loans regardless of amount or term, and guarantees valued over $20 million or with repayment terms exceeding seven years, unless the export qualifies for a longer term under certain Ex-Im programs such as the Medical Equipment Initiative or Transportation Security Program.3Maritime Administration. Cargo Preference Goods within those thresholds must ship on U.S.-flag vessels unless MARAD grants an exception.4Export-Import Bank of the United States. U.S. Flag Shipping Requirements
The Mandatory Contract Clause and Flow-Down
Federal contracts that involve ocean transportation must carry a specific clause pushing cargo preference obligations down the supply chain. The Federal Acquisition Regulation requires contractors to insert the substance of FAR 52.247-64, “Preference for Privately Owned U.S.-Flag Commercial Vessels,” into all subcontracts and purchase orders. A subcontractor three tiers below the prime carries the same obligation the prime does.5eCFR. 48 CFR 52.247-64 – Preference for Privately Owned U.S.-Flag Commercial Vessels
There is a narrow exception for purchases of commercial products or commercial services, but it disappears when the contract involves ocean transportation services, construction, supplies the contractor is reselling without adding value, or shipments directly supporting U.S. military operations or UN and NATO humanitarian missions. Most contractors moving goods overseas for the government cannot use the commercial product carve-out to escape cargo preference.
Which Vessels Actually Qualify
Flying the American flag is not enough on its own. To carry preference cargo, a vessel must be documented under U.S. law and meet specific crew requirements. Key officer positions, including the master, chief engineer, radio officer, and officers in charge of deck or engineering watches, must be filled by U.S. citizens or nationals. No more than 25 percent of unlicensed crew members may be lawfully admitted permanent resident aliens, meaning at least 75 percent of unlicensed crew must be citizens or nationals.6Office of the Law Revision Counsel. 46 USC 8103 – Citizenship and Naval Reserve Requirements
The Three-Year Documentation Rule
A foreign-built vessel newly brought under the U.S. flag cannot immediately carry government-impelled cargo. Under 46 U.S.C. § 55305, the vessel must be documented under U.S. law for at least three years first. The rule stops operators from re-flagging a foreign ship to chase a contract and then pulling it back off the registry once the work is done.2Office of the Law Revision Counsel. 46 USC 55305 – Cargoes Procured, Furnished, or Financed by the United States Government Starting January 1, 2030, an alternative path opens for vessels under three years old on the registry, requiring an agreement with the Secretary of Transportation to keep the vessel U.S.-flagged for three years and enroll it in a Defense Production Act emergency preparedness or voluntary agreement. Until then, the three-year minimum applies without exception.
Maritime Security Program Vessels
Ships enrolled in the Maritime Security Program receive federal stipends to remain available for national defense sealift. MSP enrollment carries a limit on preference work: a contractor cannot collect MSP payments for any day an agreement vessel carries more than 7,500 tons of civilian bulk preference cargo. The rule prevents double-dipping on stipend plus large bulk revenue.7eCFR. 46 CFR Part 296 – Maritime Security Program (MSP)
Fair and Reasonable Rate Determinations
Availability is not just a question of whether a U.S.-flag ship exists on the route. Rates also have to be fair and reasonable, and this is where most disputes between shippers and domestic carriers happen. MARAD builds guideline rates from four components, updated at least twice per year:8eCFR. 46 CFR 382.3 – Determination of Fair and Reasonable Rate
- Operating costs, averaged across participating vessels within a size category, indexed to current wage and non-wage escalation factors, plus actual fuel consumption at current fuel prices.
- Capital costs, including straight-line depreciation over 20 years (10 years for vessels acquired when older than 10), interest on outstanding debt, return on equity, and working capital. Newly built vessels get a bonus allowance of 10 percent of acquisition costs in year one, declining by one point annually through year ten.
- Port and cargo handling costs, based on actual tender terms and verified against independent chartering agency data.
- Brokerage and overhead, a flat 8.5 percent added to the other three components.
For liner carriers, the picture shifts. If a U.S.-flag liner operator publishes its rates with the Federal Maritime Commission, those rates are automatically fair and reasonable regardless of what a foreign carrier charges for the same route. For bulk cargo, MARAD’s cost-based methodology applies without any reference to foreign-flag market rates.
Getting a Foreign-Flag Waiver
Before loading preference cargo on a foreign-flag vessel, a shipper needs MARAD to confirm no suitable U.S.-flag ship is available. MARAD surveys domestic carriers to check availability on the route and timeframe, and the survey can take up to 14 calendar days. Plan ahead. For military shipments handled through the Army’s Transportation Command, waiver requests must be submitted at least 45 days before the vessel’s scheduled sailing date, and late requests require a senior officer memorandum explaining the compressed timeline.
The request has to include the contract number or requesting unit, the date cargo will be available at origin, the requested sail date, ports of loading and discharge, the final destination, the required delivery date, the number of pieces, and the type of vessel service needed. MARAD reviews the survey results and sends a recommendation back to the requesting agency for a final determination. Shipping preference cargo on a foreign-flag vessel without going through this process is a violation of federal law.
Reporting Every Shipment
Every department or agency subject to the 1954 Act, except the Department of Defense which follows separate regulations, must report each preference cargo shipment to MARAD’s Office of National Cargo and Compliance.9eCFR. 46 CFR Part 381 – Cargo Preference, U.S.-Flag Vessels The deadline is 20 working days from the date of loading for shipments originating in the United States, or 30 working days for shipments originating outside the country. Each report must include:
- The sponsoring federal agency or department
- Name of the vessel
- Flag of registry
- Date of loading
- Port of loading
- Port of final discharge
- Commodity description
- Gross weight in pounds
- Total ocean freight revenue in U.S. dollars
A properly notated, legible copy of the ocean bill of lading in English can satisfy the reporting requirement if it carries all the necessary information. Military cargo follows its own timeline: all documentation is due within 30 business days from the date of loading, covering both U.S.-flag and foreign-flag shipments.10Maritime Administration. Frequently Asked Questions (FAQs) – Cargo Preference
Penalties for Noncompliance
The consequences run on three tracks, and they can stack.
Civil Penalties
Any person who willfully and knowingly violates 46 U.S.C. § 55305 or its implementing regulations faces a civil penalty of up to $25,000 per violation. Each day a continuing violation persists after the date of shipment counts as a separate violation, so a single wrong-vessel shipment can generate rapidly compounding exposure.11Office of the Law Revision Counsel. 46 USC 55305 – Cargoes Procured, Furnished, or Financed by the United States Government
False Claims Act Liability
A contractor that uses a foreign-flag vessel while certifying compliance with cargo preference clauses faces False Claims Act exposure. In one settlement, a container company paid $2.6 million to resolve allegations that it used cheaper foreign-flag vessels to move shipping containers for the Army and Air Force while undercutting competitors who followed the rules. The theory: certifying compliance while knowingly using foreign-flag vessels made each invoice a false claim.12United States Department of Justice. Sea Box, Inc. Agrees to Pay $2.6 Million to Settle Claims it Used Foreign-Flagged Vessels to Transport Shipping Containers for Army, Air Force
Suspension and Debarment
Beyond money, a contractor found in violation can be suspended or debarred from all federal procurement. Suspension is temporary, up to 18 months while an investigation and any legal proceedings play out. Debarment generally runs up to three years, though certain violation categories can extend that period.13Acquisition.gov. FAR Subpart 9.4 – Debarment, Suspension, and Ineligibility For a company that depends on government contracts, debarment is an existential risk. Combined with daily-accruing civil penalties and potential FCA treble damages, that risk is the reason cargo preference compliance is not an afterthought for any contractor moving federal cargo by sea.