What duties does this tariff calculator include?

It stacks every layer an importer actually pays: the MFN (most-favored-nation) base duty from the HTSUS, Section 301 tariffs (China), Section 232 tariffs (steel and aluminum and their derivatives), IEEPA reciprocal tariffs, the Merchandise Processing Fee (0.3464% of value, min $33.58 / max $651.50), and the Harbor Maintenance Fee (0.125% of value on ocean shipments). Most free calculators only show the base rate — the total is what hits your bottom line.

Why does the duty change when I switch the country of origin?

Trade remedies are origin-specific. Section 301 applies only to goods of Chinese origin, so the same HTS code can carry 25% extra from China and nothing from Vietnam. Section 232 on steel and aluminum applies broadly across origins, and some origins qualify for free-trade preference (e.g. USMCA) that waives the base duty entirely. Flipping the origin shows exactly how much your sourcing decision is worth.

How is the Merchandise Processing Fee (MPF) calculated?

For formal entries the MPF is 0.3464% of the customs value, subject to a minimum of $33.58 and a maximum of $651.50 per entry (FY2026). The calculator applies that floor and cap automatically.

When does the Harbor Maintenance Fee (HMF) apply?

HMF is 0.125% of customs value and applies only to cargo arriving by ocean freight at a U.S. port — it is not charged on air shipments. Toggle "Ocean freight" off to remove it.

Are these tariff rates accurate enough to file an entry?

No. The figures are illustrative estimates current as of June 2026 for a curated set of high-exposure products, intended to show the scale of total duty. Tariff actions change frequently. For entry filing, use Tariffloop's live duty engine, which covers the full HTSUS and tracks rate changes automatically.

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Tariff Calculator

See the total duty you actually pay — MFN base rate plus Section 301, Section 232, IEEPA, MPF, and HMF — and watch it move when you change the country of origin.

Product (HTS code)Country of originCustoms value (USD)

Ocean freight (adds Harbor Maintenance Fee)

Rates current as of June 2026. Illustrative estimates for the products shown — not legal or filing advice. Verify against the live HTSUS before entry.

8541.43.0010 · China · $50,000.00 value

Solar cells assembled into modules (panels)

MFN base duty

$0.00

Section 301 (List 4A)25%

$12,500.00

IEEPA reciprocal10%

$5,000.00

Merchandise Processing Fee0.3464%

0.3464% of value, min $33.58 / max $651.5

$173.20

Harbor Maintenance Fee0.125%

0.125% of value (ocean freight)

$62.50

Total duty & fees

35.47% effective rate on customs value

$17,735.70

This is one product. Tariffloop runs this calculation across your entire catalog, classifies HTS codes automatically, flags Section 301/232 and UFLPA exposure, and surfaces the duty drawback you're owed.

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Frequently asked questions

Calculate duty across your whole catalog

This free tool covers a handful of high-exposure products. Tariffloop's live engine runs the full HTSUS over every SKU you import — start a free 14-day audit, no credit card required.

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