QUICK ANSWER A commercial invoice is the seller's record of an international sale: parties, goods, quantities, price, currency, and delivery terms. US Customs uses it as the primary valuation document, so duty, Section 301, and the merchandise processing fee are all calculated from the value it declares. CBP's content requirements are written out in 19 CFR 141.86, and the importer, not the supplier who typed it, answers for its accuracy.
Every commercial invoice in an import file was written by someone else, usually your supplier, and yet CBP treats it as your declaration. That mismatch is where most invoice trouble starts. Here is what the document has to contain, how it differs from a proforma or customs invoice, and which errors turn into exams, holds, and penalties.
The document duty gets calculated from
Of the three core import documents, the bill of lading proves carriage, the packing list proves contents, and the commercial invoice proves value. Value is where the money is. The declared price becomes the customs value under the transaction value method, and the duty rate, Section 301 tariff, and merchandise processing fee are all percentages of that number. An error on the invoice does not stay on the invoice; it flows straight into your landed cost and your entry.
It is not a freight document. The invoice describes the sale between you and your supplier, whatever the shipping arrangements, so customs clearance starts with it, not with the booking.
Who prepares the invoice, and who answers for it
The supplier or exporter prepares the commercial invoice, because only the seller can state what was sold and for how much. Your forwarder collects it, your entry is filed from it through licensed customs brokers, and CBP reads it as the importer's own statement of the transaction. US customs law calls this Reasonable Care: the importer is responsible for the accuracy of the declaration, even when every word on it came from a factory in Shenzhen.
The practical consequence: read your supplier's invoice before it ships, not after. A freight forwarder can catch a missing field or a mismatch, but only the buyer knows whether the price, terms, and product description reflect the actual deal.
What CBP requires on a commercial invoice
The content list is not folklore; it is regulation. 19 CFR 141.86 spells out what an invoice supporting a US entry must show. The table below is the core of that list in working order.
Commercial invoice requirements under 19 CFR 141.86
| Required element | What it means in practice | Why CBP needs it |
|---|---|---|
| Port of entry | The US port the goods are destined to | Routes the entry to the right CBP office |
| Buyer, seller, and terms of sale | Names, addresses, Incoterm, date and place of sale | Establishes the transaction and who is who |
| Detailed description of the goods | What the item is, grade or quality, marks and numbers | Supports the HTS classification |
| Quantities | In the units the trade uses, per line item | Duty and fee math per unit |
| Price paid or payable, per line | Actual transaction price, or fair market value if not a sale | The customs value starts here |
| Currency of the transaction | The currency the deal was struck in | Conversion to USD at the right rate |
| Itemized charges | Freight, insurance, commissions, packing, listed separately | Determines what is dutiable and what is not |
| Rebates and discounts | Any reduction on the price, shown separately | Prevents hidden value adjustments |
| Country of origin | Where the goods were made, per line | Drives duty rate, Section 301, and origin marking |
| Assists | Dies, molds, tooling, engineering you provided free or below cost | Dutiable additions to the declared value |
| English language, numbered pages, responsible contact | Or a certified translation | Readable, traceable, attributable |
Spend your review time on the description line. "Machine parts" or "gifts" is an invitation for an exam; a proper line reads like the HTS classification it needs to support: what the item is, what it is made of, what it is used for.
KEY TAKEAWAY The three elements suppliers most often leave off are itemized charges, assists, and per-line country of origin. Those are also the three CBP cares most about, because each one changes the dutiable value or the rate.
Commercial, proforma, or customs invoice: which one counts
Three names, three different jobs, and the names get swapped daily in supplier emails.
Invoice types in an import file
| Document | When it exists | Does CBP accept it? |
|---|---|---|
| Proforma invoice | Before the sale is final; a quote in invoice form | Only provisionally: format per 19 CFR 141.85, conditions per 19 CFR 141.91, final invoice due within 120 days under bond |
| Commercial invoice | After the sale; states the actual transaction | Yes, the standard entry document |
| Customs invoice | A country-specific form some destinations require | The US does not require a special form; the commercial invoice serves |
For US imports the working rule is short: book and plan from whatever paperwork exists, but clear customs on the commercial invoice that reflects the real deal. If only a proforma exists at arrival, entry is possible under conditions, with the true invoice owed to CBP afterward. Make that the exception; chasing final invoices after release is how importers fall behind on their own files.
The value lines CBP reads first
Itemized charges and discounts
US customs value on most transactions is the price actually paid or payable for the goods. Ocean freight and international insurance are generally not dutiable when they are shown separately, which is exactly why 141.86 wants charges itemized. An invoice that rolls freight into the product price quietly inflates your dutiable value, and one that hides a discount understates it. Both get importers into conversations they did not plan to have.
Assists: the tooling nobody declares
If you paid for the mold, supplied the fabric, or covered the engineering work behind your product, that value is an assist, and it is dutiable even though it appears on no sales invoice. Assists are a recurring finding in CBP audits precisely because nobody thinks of a mold bought in 2024 when invoicing units in 2026. Declare them; the duty on a prorated mold is small, the penalty exposure on an undeclared one is not.
Currency and conversion
The invoice must state the currency of the deal. Entries are filed in US dollars, converted at the rate applicable on the export date, so a supplier who prices in RMB but invoices in rounded USD is creating a mismatch between the contract and the declaration. Pick one currency in the purchase order and keep the invoice on it.
What a bad invoice costs at entry
Invoice errors and what they trigger
| Mistake | What it triggers | Prevention |
|---|---|---|
| Undervalued goods | Penalty exposure under 19 U.S.C. 1592, back duties plus interest | Declare the real transaction price, always |
| Vague description | CBP exam or hold, delayed release | Describe like the HTS line: material, function, grade |
| Missing per-line origin | Hold, marking questions, wrong duty rate | Origin per item, matching the certificate of origin |
| Invoice disagrees with packing list or B/L | Document review, exam risk | One data source for all three documents |
| Freight buried in the goods price | Overpaid duty, unclean comparison | Itemize charges separately |
| Undeclared assists | Audit findings, retroactive duty | Track tooling and materials you provide |
KEY TAKEAWAY CBP rarely reacts to one clean document. It reacts to disagreement between documents, so consistency across the invoice, packing list, and bill of lading protects you more than polish on any single form.
An invoice that says 412 cartons when the packing list says 409, or a value that looks implausible for the bill of lading weight, is what turns a routine entry into a two-week conversation.
How Platton checks commercial invoices before entry
Platton is a transportation provider, not your compliance department, and the review reflects that split: we make sure the document set is complete and consistent, you stay the owner of what it declares.
Completeness against the 141.86 list
Every invoice in the file gets checked against the required-element list above as part of our supplier document validation: parties, description, quantities, price, currency, itemized charges, origin. What is missing goes back to the supplier before loading day, while it is still a supplier-side correction.
Three documents, one story
Invoice, packing list, and bill of lading are cross-checked line by line: quantities, weights, marks, consignee. Mismatches get flagged to you and the supplier with exactly what needs to change, which is the difference between fixing a typo and explaining it to CBP.
Estimated duty from the declared value
From the invoice value and your HTS classification we give you an estimated duty and fee calculation before arrival, so the landed cost number you plan with reflects what the entry will actually claim. The estimate is guidance; the classification and value remain your call as the importer.
Get a document check with your next import quote
Common Questions About Commercial Invoices
Who provides the commercial invoice?
The seller, usually your supplier or their export agent, because only the seller can state the transaction. Your forwarder and broker work from it but do not author it. The importer remains responsible for its accuracy at entry, which is why reviewing it before shipment is worth ten minutes of anyone's time.
What is the difference between a commercial invoice and a regular invoice?
A regular invoice requests payment; a commercial invoice declares an international transaction to customs. The commercial version carries elements a payment invoice never needs: per-line country of origin, itemized freight and insurance, Incoterm, and assists. One document can serve both purposes if it contains everything 19 CFR 141.86 requires.
Is a customs invoice the same as a commercial invoice?
In US practice, effectively yes: CBP accepts a commercial invoice and requires no special customs form. Some other destinations (Canada, for example) publish their own customs invoice formats. If a supplier sends a "customs invoice", check that it carries the full commercial detail rather than assuming the title does the work.
Can I create my own commercial invoice?
There is no prescribed form, so yes, any layout works if the content is complete. In an import relationship, though, the seller should issue it, because the invoice is evidence of what they sold and for how much. Buyer-drafted invoices are a red flag in audits when they diverge from the supplier's own records.
Can a proforma invoice be used for customs clearance?
Provisionally. CBP accepts a proforma in the format of 19 CFR 141.85 under the conditions in 19 CFR 141.91, with the final commercial invoice due within 120 days and a bond securing it. It is a fallback for timing problems, not a routine, and the declared values still have to be right.
What happens if the invoice value is wrong?
Undervaluation is the serious direction: it understates duty and creates penalty exposure under 19 U.S.C. 1592, plus back duties and interest when found. Overvaluation mostly wastes money in overpaid duty, though a knowingly false value is still a false statement to CBP. Either way the fix is the same: correct the invoice and the entry, do not let a known error ride.
Related Documentation Guides
Bill of lading explained: the carriage document your invoice has to agree with.
Packing list requirements: the piece-count document CBP compares against the invoice.
Certificate of origin and the USMCA form: proving the origin your invoice declares.
HTS and HS codes: the classification your description has to support.
