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How to calculate landed cost and total duty

Landed cost is the estimated total cost of getting merchandise to its destination and ready for sale. It can include:

• Product price
• International freight and insurance
• Customs duties
• Additional trade-remedy duties, such as Section 301 or Section 232 duties
• Merchandise Processing Fee (MPF)
• Harbor Maintenance Fee (HMF), when applicable
• Customs brokerage, handling, storage, and other logistics charges
• Other applicable taxes or government charges

“Total duty” is narrower than landed cost. It generally means the base customs duty plus any applicable additional duties. Fees such as MPF and HMF are usually calculated separately, even though they are part of the importer’s overall border cost.

Key terms

Customs value

Customs value is the value used by Customs and Border Protection (CBP) to calculate many duties and fees. In many commercial transactions, it is based on the transaction value—the price paid or payable for the imported goods—subject to required additions or adjustments.

The customs value may not be identical to:

• The amount paid to the supplier
• The invoice total
• The retail selling price
• The total amount paid for freight, insurance, and other logistics services

The correct value depends on the applicable customs valuation method and the facts of the transaction. Related-party sales, assists, royalties, commissions, and other additions can require professional review.

Base duty

The base duty is the ordinary customs duty assigned to the product’s Harmonized Tariff Schedule of the United States (HTSUS) classification.

The HTSUS may specify a duty as:

• Ad valorem: a percentage of customs value
• Specific: a fixed amount based on a unit, such as weight or quantity
• Compound or mixed: a combination of an ad valorem rate and a specific amount
• Free: no ordinary base duty, subject to the terms of the applicable provision

Correct classification is essential. If you need help finding a code, you can search for a product or HTS code or browse the HTS tree.

Additional Section 301 duties

Section 301 duties are additional duties imposed on certain products based on trade actions and, in many cases, the product’s country of origin.

They are separate from the base HTSUS duty. A product can therefore have:

• A base duty only
• A Section 301 duty only in addition to a base duty
• Both a base duty and a Section 301 duty
• An exclusion or other special treatment that changes whether the additional duty applies

Review the Section 301 hub and the applicable product and origin information. Section 301 treatment can depend on the HTS classification, country of origin, exclusions, and the rules in effect for the entry.

Additional Section 232 duties

Section 232 duties are additional duties or other trade measures that may apply to certain products based on national-security trade actions.

Section 232 treatment can depend on:

• The product’s HTS classification
• The country of origin
• Product-specific provisions
• Quotas, exclusions, or other special rules
• Whether the merchandise is covered as a primary product or a derivative product

Use the Section 232 hub to review the relevant measure. Do not assume that Section 232 treatment applies to every product made from a covered material.

Merchandise Processing Fee (MPF)

The Merchandise Processing Fee, or MPF, is a government processing fee associated with many formal and informal customs entries. It is generally calculated under rules based on the entered value and may be subject to minimum and maximum amounts or different treatment depending on the entry type.

Because fee rules and limits can change, confirm the current treatment with CBP or the live data for the applicable entry.

Harbor Maintenance Fee (HMF)

The Harbor Maintenance Fee, or HMF, is a fee that may apply to certain commercial cargo transported through U.S. ports. It is generally associated with ocean transportation and is calculated separately from customs duty.

HMF does not apply to every import. Confirm whether the transportation mode, port activity, and entry circumstances make it applicable.

Step-by-step calculation method

1. Confirm the product classification

Identify the complete HTSUS code for the merchandise. Classification can depend on the product’s material, function, construction, processing, packaging, and other characteristics.

Start with HTS code lookup or the HTS tree. Use the product’s HTS code page to review the applicable duty information and the per-code duty calculator.

If classification is uncertain, obtain a binding ruling or consult a qualified customs professional. A calculator cannot correct an incorrect classification.

2. Confirm the country of origin

Determine the product’s customs country of origin—not simply the country from which it was shipped. Origin may depend on where the merchandise was manufactured or underwent a substantial transformation.

Origin is particularly important for additional trade measures. Review the measures by country of origin page where relevant, and check the current measure data for the specific product and origin.

3. Determine the customs value

Establish the customs value for the entry. For a typical sale, begin with the transaction value and identify any required additions or adjustments.

Keep supporting records such as:

• Commercial invoices
• Purchase orders
• Payment records
• Freight and insurance documents
• Assists, royalty, or licensing records
• Related-party pricing documentation

Use the value required for customs purposes, not automatically the retail price or the full landed cost.

4. Calculate the base duty

Apply the base-duty rule shown for the HTSUS code:

• For an ad valorem rate:
  Customs value × applicable base-duty rate
• For a specific rate:
  Applicable quantity or unit measure × specific duty
• For a compound rate:
  Add the ad valorem result and the specific-duty result

The HTS provision may contain special notes, alternate rates, tariff-rate quotas, or exclusions. Read the complete provision rather than relying only on a shortened product description.

5. Check for Section 301 duties

Determine whether the product and origin fall within a current Section 301 measure. If so, calculate the additional duty using the rule for that measure and the required customs-value basis.

Do not automatically add Section 301 duties merely because the goods are associated with a covered country. The result depends on the exact HTS classification, origin, exclusions, and entry rules. Check the Section 301 information and the current measures list.

6. Check for Section 232 duties

Review whether Section 232 applies to the product. The calculation may differ depending on whether the merchandise is a covered steel, aluminum, or derivative product, and whether special provisions apply.

Check the Section 232 information and any product-specific instructions. A product may be subject to more than one type of duty or may qualify for a different treatment depending on its composition and origin.

7. Add total duty

A simplified total-duty calculation is:

Total duty =
Base duty
+ applicable Section 301 duty
+ applicable Section 232 duty
+ other applicable customs duties

“Other applicable customs duties” may include antidumping and countervailing duties, safeguard measures, tariff-rate quota charges, or other special duties. These are not automatically included in a standard HTS duty rate and may require separate research.

The per-code duty calculator on each HTS code page can help estimate the applicable base and additional duties. Open the code through lookup or the HTS browser and review the assumptions shown by the calculator.

8. Calculate MPF and HMF separately

After calculating duty, determine whether MPF and HMF apply to the entry.

Use the applicable customs value and entry information required by the fee rules. Check for:

• Entry type
• Transportation mode
• Port and cargo details
• Current fee formulas
• Minimum or maximum fee rules
• Exemptions or special treatments

Do not combine MPF or HMF into the duty rate unless your accounting system specifically labels the combined figure as a total import charge.

9. Add non-government landed-cost items

To estimate the full landed cost, add the costs that occur before the goods are ready for sale:

Landed cost =
Product cost
+ international freight
+ insurance
+ total duty
+ MPF
+ HMF, if applicable
+ brokerage and customs clearance
+ port, terminal, handling, and storage charges
+ domestic delivery
+ other applicable costs

The appropriate calculation depends on your costing policy. For example, some businesses include domestic delivery in landed cost, while others track it as a separate fulfillment expense.

10. Check current rules before entry

Duty treatment can change because of new measures, exclusions, quota status, court decisions, or amendments to the HTSUS. Review recent changes and all tracked measures before relying on an estimate.

For high-value or complex shipments, have a customs broker, trade attorney, or other qualified professional verify the classification, valuation, origin, and additional-duty analysis.

Practical example using variables

Assume:

• V = customs value
• B = base-duty amount
• D301 = applicable Section 301 duty
• D232 = applicable Section 232 duty
• M = MPF
• H = HMF
• L = other logistics and import costs

Then:

Total duty = B + D301 + D232
Border charges = Total duty + M + H
Landed cost = Product cost + freight + insurance + Border charges + L

If the base duty is ad valorem:

B = V × base-duty rate

If Section 301 or Section 232 applies on an ad valorem basis:

D301 = V × applicable Section 301 rate
D232 = V × applicable Section 232 rate

These formulas are simplified. The actual calculation may use a different value basis, a specific or compound rate, special rounding rules, quota treatment, or a measure-specific method.

Common mistakes to avoid

• Using the supplier’s country of shipment instead of the customs country of origin
• Treating the base HTS duty as the only possible duty
• Assuming Section 301 or Section 232 applies—or does not apply—without checking the exact HTS code
• Applying a percentage to the retail price instead of the required customs value
• Forgetting specific or compound duty components
• Treating MPF and HMF as customs duty
• Assuming HMF applies to every import or every transportation mode
• Ignoring antidumping, countervailing, safeguard, quota, or other special measures
• Using an old calculator result without checking recent changes
• Treating an estimate as a binding customs determination

Frequently asked questions

Is landed cost the same as total duty?

No. Total duty generally covers base duty and applicable additional duties. Landed cost is broader and may include freight, insurance, MPF, HMF, brokerage, handling, storage, and domestic delivery.

Is customs value the same as the invoice amount?

Not always. The invoice may be the starting point for transaction value, but customs rules can require additions, adjustments, or a different valuation method. Related-party transactions and other special circumstances may require professional review.

Can I use the HTS code page to calculate all import charges?

The per-code duty calculator can help estimate the duties associated with the HTS code, including applicable additional measures shown in the tool. It may not capture every entry-specific cost, such as brokerage, storage, transportation, or all special customs programs. Review the calculator assumptions and confirm the current official requirements.

Do Section 301 and Section 232 replace the base duty?

Usually, they are additional measures rather than replacements for the ordinary HTSUS duty. Whether they apply, and how they are calculated, depends on the product, classification, origin, exclusions, and current rules.

Reference information only, not customs, legal, or classification advice. Tariff rules change frequently; confirm against the official source before you act.