TariffShield301 Studio — Free Interactive In-Browser Studio
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Quick Reference & Frequently Asked Questions
Are US import tariffs calculated on FOB factory cost or total CIF (cost + ocean freight)?
Unlike the EU and UK (which assess duty on CIF value including shipping), US Customs and Border Protection (CBP) assesses import duties on the transaction value (FOB port of export), excluding international ocean or air freight and marine insurance.
How do Section 301 tariffs stack with standard HTS MFN duty rates?
Section 301 duties (such as 7.5%, 25%, or 50% under Chapter 99 subheadings like 9903.88.01/.03/.15) are additive to the base Most Favored Nation (MFN) Column 1 duty rate. A backpack with a 17.6% base MFN rate and a 25% Section 301 tariff faces a 42.6% total duty rate before CBP fees.
What are CBP Merchandise Processing Fee (MPF) and Harbor Maintenance Fee (HMF)?
Formal US customs entries (> $2,500 value) incur an ad valorem Merchandise Processing Fee (MPF) of 0.3464% of FOB value (subject to a $31.67 minimum and $614.35 maximum per entry) plus a 0.125% Harbor Maintenance Fee (HMF) for ocean vessel arrivals.
Why does negotiating a 7% factory FOB discount offset nearly a third of a 25% tariff?
Because the tariff is multiplied against the FOB price. Lowering a $10.00 FOB price by 8% ($0.80) saves $0.80 on the product AND saves $0.24 on a 30% stacked duty—delivering $1.04 in total landed cost reduction.