The cost route

The route highlights why a supplier quote is not a unit cost. Dutiable additions, government charges, transport, insurance, broker work, terminal events, inland delivery, and receiving can all attach before inventory is available for sale.

Landed-cost formulas

Actual customs valuation can include or exclude amounts differently from this simplified input. Duty can use special bases, unit rates, compound rates, quotas, exclusions, and program rules. Use the formula only after a broker or qualified trade professional confirms the inputs.

Worked formal vessel-entry example

The supplier invoice is $50,000 and entered assists and packing add $2,000, producing $52,000 of modeled customs value. Ordinary duty at 7.5 percent is $3,900. An additional ten-percent trade-remedy assumption adds $5,200. MPF at 0.3464 percent is $180.13, which lies between the entered current minimum and maximum. HMF at 0.125 percent is $65.

International freight is $4,000, insurance is $500, broker cost is $350, drayage and inland delivery are $1,200, exam and storage allowance is $300, and other receiving cost is $500. Total landed cost is $68,195.13, or $68.20 for each of 1,000 units. Import cost above the supplier invoice is $18,195.13, a 36.39 percent uplift.

The budget was $65 per unit. The model is $3.20 per unit and $3,195.13 in total over budget. The gap should be assigned to its cause—classification, tariff, fee, freight, accessorial, quantity, or assumption—before the company changes retail price or approves a supplier.

Customs value is not automatically the invoice total

CBP explains that duty is generally assessed on the price actually paid or payable, with applicable statutory additions. Potential additions include packing costs, selling commissions, assists, royalty or license fees, and proceeds that accrue to the seller. Related-party transactions and other valuation methods can require additional analysis.

International freight and insurance are commonly excluded from transaction value when properly identified, yet they still belong in landed cost. The calculator therefore keeps customs value separate from port-to-door economics. Do not add freight to a customs base merely because it belongs in landed cost, and do not omit a dutiable assist merely because it was not on the supplier invoice.

Maintain the commercial invoice, purchase order, payment support, assists, molds or tooling, packing, royalty agreements, commissions, freight and insurance breakdown, and valuation rationale.

Classification and origin determine more than one rate

The Harmonized Tariff Schedule of the United States assigns classification provisions and general rates. Product identity, material, function, construction, dimensions, value, user, and other facts can change the heading or subheading. Similar marketing descriptions do not guarantee the same tariff classification.

Country of origin is governed by applicable rules, not simply shipment origin or the supplier’s address. Origin can affect ordinary duty, free-trade eligibility, special programs, quotas, antidumping or countervailing duties, and additional tariffs. Transshipping through another country does not ordinarily change origin.

The tool provides separate ordinary and additional tariff inputs so the importer can see them. It does not decide whether Section 301, Section 232, antidumping, countervailing, safeguard, or another measure applies. Confirm current HTS notes and CBP guidance for the entry date.

MPF and HMF depend on the entry

The entered MPF minimum and maximum are applied mechanically. Entry type, trade program, exclusions, merchandise, country, and future periodic adjustments can change actual liability. The HMF default must be set to zero when not applicable.

Freight quotes need a boundary and an expiration date

Clarify Incoterms and the quoted scope: pickup, export clearance, origin terminal, main freight, fuel, peak season, security, documentation, destination terminal, chassis, appointment, drayage, residential or limited access, and final delivery. A low ocean rate can coexist with high destination charges.

Container utilization changes cost per unit. Cube, weight, palletization, floor loading, minimum charges, less-than-container consolidation, chargeable air weight, and split shipments matter. Divide by usable units after damage, quality rejection, shortage, and samples when those losses are predictable.

Freight rates and congestion change quickly. Store quote date, validity window, sailing, route, equipment type, free time, and assumptions. Model a stress case for delay, exam, demurrage, detention, storage, and expedited replacement.

Do not assume an old low-value exemption still applies

U.S. low-value import treatment changed materially in 2025, and the rules and implementation can continue to evolve. Do not use an old general statement that every shipment below $800 enters free of duty. Postal versus non-postal channel, country, product, effective date, and current presidential or agency action can matter.

For low-value e-commerce, obtain current carrier and CBP instructions before promising duty-free delivery. Brokerage, disbursement, advancement, postal, entry, and customer-delivery charges can also arise even when ordinary duty is low.

This calculator makes no de minimis assumption. Enter the rates and costs applicable to the actual shipment and preserve the authority effective on the expected entry date.

Incoterms allocate tasks and risk, not final tax liability by themselves

EXW, FCA, FOB, CIF, DAP, DDP, and other Incoterms can allocate transport tasks, cost, and risk between buyer and seller. They do not replace customs valuation, classification, origin, importer-of-record obligations, or U.S. law. A supplier’s DDP quote still needs a clear description of who enters the goods and how duty is supported.

Avoid double counting when the supplier invoice includes freight or duty. Break the quote into merchandise, dutiable additions, international transport, insurance, government charges, brokerage, and destination services. Then map each amount once to the manifest.

Choose Incoterms that match the company’s ability to control freight, compliance, visibility, and claims. The cheapest-looking term may hide poor documentation or no access to entry data.

Allocate shipment costs by the driver that caused them

Dividing every cost evenly per unit works only when items are similar. Duty should follow customs value and classification. Freight may follow weight, cube, pallet, or chargeable weight. Insurance may follow value. Broker and entry charges may be assigned per line or shipment. Inspection can follow affected products.

For a mixed container, calculate SKU-level invoice value, additions, duty, tariff, and units first. Allocate common logistics with a documented rule. Preserve both shipment-level reconciliation and SKU-level allocation so the sum of unit costs equals the actual entry and freight bills.

A small, high-value product and a bulky, low-value product should not automatically receive the same cost per unit. Allocation affects pricing, margin, replenishment, and supplier comparison.

Landed cost connects customs records, inventory, and tax records

Many costs to acquire inventory and bring it to its location and condition may become part of inventory cost under the applicable accounting and tax rules. Timing, capitalization, and allocation require consistent treatment. This operating estimate does not decide the tax basis of inventory or deduction timing.

IRS Publication 334 discusses inventory and COGS for small businesses, and Publication 583 describes recordkeeping.

Reconcile commercial invoice, packing list, bill of lading or air waybill, entry summary, duty payment, broker statement, freight bills, terminal bills, drayage, receiving, damage claims, and the inventory subledger. Keep records for the period required by applicable customs and tax rules.

Use landed cost before approving a purchase order

Compare suppliers at a common delivery point, unit quality, lead time, payment term, minimum quantity, defect rate, currency, and compliance risk. A lower factory price can lose after duty, poor container utilization, long transit, inspection, rework, and working-capital cost.

Run base, optimistic, and stressed scenarios. Change exchange rate, tariff, freight, quantity, rejection rate, demurrage, and delivery timing. Calculate gross margin and cash requirement after landed cost. Do not approve a price based on an outdated duty rate or a freight quote that expires before sailing.

After receipt, replace estimates with actual bills and analyze purchase-price, duty, freight, quantity, and accessorial variance. Feed the updated unit cost into pricing and the next purchase order.

Pre-import landed-cost checklist

1. Confirm importer of record.
2. Validate HTS classification.
3. Document country of origin.
4. Check special tariffs and remedies.
5. Build customs value additions.
6. Confirm entry type and MPF.
7. Apply HMF only when appropriate.
8. Define Incoterms and freight scope.
9. Quote broker, bond, and agency fees.
10. Stress exams and storage.
11. Allocate common cost by driver.
12. Reconcile actual entry after receipt.

Frequently asked questions

References

• U.S. Customs and Border Protection, merchandise processing and harbor maintenance fees
• U.S. Customs and Border Protection, customs value and invoice value
• U.S. Customs and Border Protection, Harmonized Tariff Schedule guidance
• U.S. International Trade Commission, current Harmonized Tariff Schedule
• IRS Publication 334, Tax Guide for Small Business