Drayage Demurrage & Detention Dispute Letter Templates Under OSRA 2022 and 46 CFR Part 541

Not legal advice. This article and the templates below are operational guidance for organizing facts and citing the published rule. They are not legal advice. Contracts, tariffs, and service contracts vary, and the rule text can be amended. Review the current text of 46 CFR Part 541 and consult qualified maritime counsel before relying on any template or filing a charge complaint with the Federal Maritime Commission.

What OSRA 2022 and Part 541 Changed

The Ocean Shipping Reform Act of 2022, signed in June 2022, amended the Shipping Act at Title 46 of the United States Code. Among other changes, it made it a prohibited practice for an ocean common carrier to issue a demurrage or detention invoice that lacks specified information, it provided that a billed party is not required to pay a charge invoiced without that information, and it placed the burden of establishing the reasonableness of invoiced demurrage or detention charges on the ocean carrier in charge complaint proceedings. Congress directed the Federal Maritime Commission to write implementing billing rules.

The FMC published its final rule, Demurrage and Detention Billing Requirements, at 46 CFR Part 541, effective in May 2024. Part 541 applies to billing parties, which include vessel operating common carriers, non vessel operating common carriers, and marine terminal operators that invoice demurrage or detention. It sits alongside the Commission's earlier interpretive rule on the reasonableness of demurrage and detention practices at 46 CFR 545.5, which focuses on whether charges serve their purpose of incentivizing the prompt movement of cargo and equipment. For drayage carriers, the practical effect is that a sloppy or late invoice is no longer just an annoyance. It may simply not be payable.

The Four Tests Every Invoice Must Pass

Build your audit around four tests that map to the rule. Run them in order, because the first failure is often enough to support a waiver request.

Test 1: Was the invoice issued to the proper party?

Under 46 CFR 541.4, a properly issued invoice goes to the person for whose account the billing party provided ocean transportation or storage, or to the consignee. That is usually the shipper or beneficial cargo owner under the bill of lading or service contract, or the consignee named on it. A motor carrier that picked up a container but never contracted with the ocean carrier or terminal is generally not a proper billed party. The invoice must also identify the person invoiced and state the basis for why that person is the proper party. When a drayage carrier receives an invoice addressed to it for an import container it hauled on behalf of a customer, the first question is whether the trucker had any contract with the billing party at all.

Test 2: Was the invoice issued on time?

Under 46 CFR 541.5, the billing party must issue the invoice within 30 calendar days from the date on which the charge was last incurred. If it does not, the billed party is not required to pay. The rule also addresses invoices that first go to an intermediary, such as a non vessel operating common carrier passing through a carrier charge, and allows additional time for that pass through situation. Your TMS should store the date the last charge day accrued, typically the gate out date for demurrage or the empty return date for detention, and the invoice date, so the gap can be computed automatically.

Test 3: Does the invoice contain every required element?

46 CFR 541.6 lists the minimum information. Grouped as the rule groups them, an invoice should include:

• Identifying information - The bill of lading number, the container number, the port of discharge for imports or port of loading for exports, the billing date, the payment due date, and the name of the person invoiced with the basis for why that person is the proper party.
• Timing information - The allowed free time in days, the start date of free time, the end date of free time, and the specific dates for which demurrage or detention was incurred.
• Rate information - The applicable daily rate or rates and the applicable rule, such as the tariff provision or service contract term, on which the charges are based.
• Dispute information - An email address, telephone number, or web portal for submitting a dispute, the URL of the publicly accessible portion of the billing party's tariff, and a statement that the charges are consistent with FMC rules on demurrage and detention and that the billing party's performance did not cause or contribute to the underlying charges.

Missing any of these is a defect you can name precisely in a dispute letter. A common real world gap is an invoice that lists a total amount and container number but omits the free time start and end dates, which makes it impossible to verify the charge days.

Test 4: Was the billed party given the dispute window?

Under 46 CFR 541.7, the billing party must give the billed party at least 30 calendar days from the invoice date to request mitigation, refund, or waiver, and must resolve the request within 30 calendar days of receiving it. Calendar these two dates the day an invoice arrives. Missing your own window weakens an otherwise strong dispute.

Build the Evidence Package Before You Write

A dispute letter is only as strong as the facts behind it. For each container, assemble the vessel discharge date, the container availability date, terminal appointment attempts and their outcomes, gate out and gate in transaction times from the terminal interchange receipts, empty return attempts that were refused, any terminal closure or free time extension notices, and the bill of lading parties. Drayage carriers that capture this data in the TMS at the time of the move can produce a dispute package in minutes. Carriers that rely on email threads and driver memory spend hours rebuilding it.

The data model is straightforward: a container event table keyed by container number and bill of lading, with timestamped events from terminal EDI or APIs, appointment system screenshots or confirmation numbers, and the gate transaction receipts attached as images. Our ELD and EDI integration work connects terminal status feeds and EDI 315 container status messages to that table, and our document AI automation practice can extract invoice fields so the Part 541 checklist runs automatically when an invoice arrives.

Example: a drayage carrier receives a demurrage invoice for one import container showing 4 charge days at a daily rate stated on the invoice. The TMS shows two appointment requests during free time that the terminal system rejected for lack of availability, and the invoice omits the free time end date. The carrier has at least two independent dispute grounds: a missing required element under 541.6 and a reasonableness argument under 545.5 because the cargo could not be retrieved. Use the chassis, per diem, and demurrage dispute estimator to rough out the charge days and dollars at stake before deciding how much effort a dispute justifies.

Template 1: Improper Billed Party

Use this when a drayage carrier or other party that did not contract with the billing party receives an invoice. Replace every bracketed placeholder and remove any line that does not apply.

[YOUR COMPANY LEGAL NAME]
[STREET ADDRESS]
[CITY, STATE ZIP]
[DISPUTE CONTACT NAME AND EMAIL]

[DATE]

To: [BILLING PARTY NAME]
Via: [DISPUTE EMAIL OR PORTAL NAME FROM INVOICE]

Re: Dispute of Invoice [INVOICE NUMBER] dated [INVOICE DATE]
    Container: [CONTAINER NUMBER]
    Bill of Lading: [BL NUMBER]
    Amount Invoiced: [AMOUNT]

[BILLING PARTY NAME]:

[YOUR COMPANY] disputes the above invoice in its entirety and
requests that it be withdrawn and the charges waived.

Under 46 CFR 541.4, a properly issued demurrage or detention
invoice may be issued only to the person for whose account the
billing party provided ocean transportation or storage, or to
the consignee. [YOUR COMPANY] is a motor carrier that performed
drayage for [CUSTOMER NAME]. [YOUR COMPANY] did not contract
with [BILLING PARTY NAME] for ocean transportation or storage of
this cargo and is not the consignee on the bill of lading.

The invoice also does not state a basis for why [YOUR COMPANY]
is the proper party, as required by 46 CFR 541.6.

Please confirm in writing that this invoice has been withdrawn.
If you contend [YOUR COMPANY] is a proper billed party, please
provide the contract or document on which you rely.

This dispute is submitted within the dispute period provided
under 46 CFR 541.7. We request resolution within 30 calendar
days of receipt.

Sincerely,
[NAME]
[TITLE]
[YOUR COMPANY]

Template 2: Missing Required Information or Late Issuance

Use this when the invoice lacks one or more 541.6 elements or was issued more than 30 calendar days after the charge was last incurred. List only the defects that actually apply.

[YOUR COMPANY LEGAL NAME]
[DISPUTE CONTACT NAME AND EMAIL]

[DATE]

To: [BILLING PARTY NAME]
Via: [DISPUTE EMAIL OR PORTAL NAME FROM INVOICE]

Re: Request for Waiver - Invoice [INVOICE NUMBER]
    dated [INVOICE DATE]
    Container: [CONTAINER NUMBER]
    Bill of Lading: [BL NUMBER]
    Amount Invoiced: [AMOUNT]

[BILLING PARTY NAME]:

[YOUR COMPANY] requests waiver of the charges on the above
invoice because it does not comply with 46 CFR Part 541.

[INCLUDE IF LATE]
1. Late issuance. Under 46 CFR 541.5, an invoice must be issued
   within 30 calendar days from the date the charge was last
   incurred. The last charge date was [LAST CHARGE DATE]. The
   invoice is dated [INVOICE DATE], which is [NUMBER] calendar
   days later.

[INCLUDE IF CONTENTS ARE MISSING]
2. Missing required information. 46 CFR 541.6 requires the
   following items, which do not appear on the invoice:
   - [E.G. START DATE OF FREE TIME]
   - [E.G. END DATE OF FREE TIME]
   - [E.G. SPECIFIC DATES CHARGES WERE INCURRED]
   - [E.G. APPLICABLE TARIFF RULE OR CONTRACT TERM]
   - [E.G. REQUIRED STATEMENT OF CONSISTENCY WITH FMC RULES]

Under the Shipping Act as amended by the Ocean Shipping Reform
Act of 2022 and 46 CFR Part 541, a billed party is not required
to pay a demurrage or detention charge invoiced without the
required information or outside the required issuance period.

Please confirm in writing that the charges are waived. If any
portion of this amount has already been paid, please refund
[AMOUNT PAID] to [REMITTANCE DETAILS].

This request is submitted within the period provided under
46 CFR 541.7. We request resolution within 30 calendar days of
receipt.

Sincerely,
[NAME]
[TITLE]
[YOUR COMPANY]

Template 3: Reasonableness and Mitigation Request

Use this when the invoice is technically complete but the charges accrued because cargo or empty return was not possible, for example no appointments, terminal closures, or refused empty returns. This template relies on the reasonableness principles in 46 CFR 545.5 and on evidence, so attach the records.

[YOUR COMPANY LEGAL NAME]
[DISPUTE CONTACT NAME AND EMAIL]

[DATE]

To: [BILLING PARTY NAME]
Via: [DISPUTE EMAIL OR PORTAL NAME FROM INVOICE]

Re: Request for Mitigation or Waiver - Invoice [INVOICE NUMBER]
    dated [INVOICE DATE]
    Container: [CONTAINER NUMBER]
    Bill of Lading: [BL NUMBER]
    Charge Dates Disputed: [FIRST DATE] through [LAST DATE]

[BILLING PARTY NAME]:

[YOUR COMPANY] requests waiver of [NUMBER] charge days on the
above invoice. During those days the [CARGO / EMPTY CONTAINER]
could not be [RETRIEVED / RETURNED] for reasons outside the
control of the cargo interests and the motor carrier.

Summary of evidence (attached):
- [DATE TIME]: Appointment requested, refused. Reason shown:
  [REASON]. Confirmation or screenshot: [REFERENCE].
- [DATE TIME]: Terminal advisory [REFERENCE] stating
  [CLOSURE / NO EMPTY RECEIVING / OTHER].
- [DATE TIME]: Driver arrived for empty return, refused at gate.
  Gate transaction or trouble ticket: [REFERENCE].
- [DATE TIME]: Container gated [OUT / IN]. Interchange receipt:
  [REFERENCE].

The Commission's interpretive rule at 46 CFR 545.5 considers
whether demurrage and detention charges serve their purpose of
incentivizing the movement of cargo and equipment. Charges that
accrue when cargo or equipment cannot be moved do not serve that
purpose.

We request that the disputed charge days be waived and a
corrected invoice issued. This request is submitted within the
period provided under 46 CFR 541.7, and we request resolution
within 30 calendar days of receipt.

Sincerely,
[NAME]
[TITLE]
[YOUR COMPANY]

Attachments: [LIST OF EXHIBITS]

Running Disputes as a Process, Not a Fire Drill

One dispute letter is easy. Fifty a month across several terminals, ocean carriers, and customers needs a workflow. Treat each invoice as a record with a status: received, audited, disputed, awaiting response, resolved paid, resolved waived, or escalated. Store the invoice image, the audit result for each of the four tests, the dispute letter sent, the date sent, the response, and the final outcome. Set alerts for day 25 of the dispute window and day 30 after the dispute was received, so nothing ages past a deadline unnoticed.

Billing matters too. When a drayage carrier legitimately passes demurrage through to its customer under its own rate agreement, the accessorial line in the TMS should link back to the original invoice and the dispute record, so the customer sees the same evidence and the carrier does not bill a charge it is simultaneously disputing. That linkage is part of good transportation accounting integration. Monthly reporting by billing party, terminal, and dispute ground shows which counterparties issue the most defective invoices and where operational changes, such as earlier appointment booking, would avoid charges in the first place.

When a billing party does not respond or denies a well supported dispute, the next steps may include escalation within the billing party, involving the beneficial cargo owner, or a charge complaint with the FMC. Those are decisions for the cargo owner and counsel. The carrier's job is to have clean, timestamped evidence ready.

For chassis split and per diem issues that often travel with demurrage disputes, see the related guides on intermodal chassis pool split billing and ocean port free time under OSRA and the intermodal chassis split billing dispute mitigation playbook.

Related practice areas for this work include ELD and EDI Integration, Document AI Automation, TMS Implementation, and SQL Data Mining. Each practice page describes scope, deliverables, and how an engagement starts with a short discovery call.

How Strong Tower Consulting Helps

Strong Tower Consulting helps drayage carriers and freight operators turn a regulatory requirement into a working system inside the TMS rather than a side spreadsheet that only one person understands. For demurrage and detention, that means capturing terminal events and gate transactions automatically, extracting invoice fields, running the Part 541 checklist on arrival, generating draft dispute letters from stored evidence, and reporting outcomes. Strong Tower Consulting, LLC and Exspeedite LLC are separately organized sister companies under common ownership. That separation keeps consulting advice vendor neutral and focused on the carrier operation.

To discuss your terminals, your invoice volume, and your current systems, contact us or call 763-244-1373 and ask for Scott Elliott. A short call is enough to map the first pilot and the data gaps to close before the next disputed invoice arrives.

Frequently Asked Questions