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=SUMIFS(us_gross, SKU, A2) - VLOOKUP(A2, us_fees!A:D, 4, FALSE)⚠️ Why Manual Formulas Fail at Scale: Manual spreadsheet formulas break on multi-row us import adjustments, tiered fees, and CSV delimiter shifts.
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A '25% tariff' is rarely 25%: it stacks on top of your 3.9%–17.6% MFN base duty, plus 0.3464% CBP Merchandise Processing Fee ($31.67–$614.35) and 0.125% Harbor Maintenance Fee.
Because US customs duties apply to FOB factory value (not ocean freight), negotiating an 8% FOB discount with your supplier reduces both the product cost AND the 29% tariff assessed on it.
If your tariff rises by $2.00/unit and you raise your Amazon price by $2.00, Amazon takes 15% ($0.30) of that price hike. You must divide pass-through increases by 0.85 to stay margin-neutral.
Audit HTS 10-digit tariff stacks, CBP entry fees, and supplier cost-sharing scenarios 100% locally in your browser for a $19 one-time buyout instead of $199/mo enterprise tools.
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Paste your imported SKUs with factory FOB price, per-unit ocean freight, MFN base duty rate, and Section 301 surcharge.
Slide the Retail Pass-Through bar to balance supplier FOB discounts against customer price increases without tanking conversion.
Download a clean CSV of new target FOB prices for factory negotiations and updated retail prices for Shopify and Amazon.
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| Feature / Metric | 🛡️ TariffShield301 Studio | ☁️ Cloud SaaS (Flexport) |
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| MFN + Section 301 + CBP MPF/HMF Stack | 🛡️ Full Compounded US Customs Entry Math | ☁️ Cloud SaaS Upload |
| Supplier FOB Concession Leverage Math | 🛡️ Models Compound FOB + Duty Tax Savings | ☁️ Cloud SaaS Upload |
| 15% Marketplace Fee Gross-Up Adjustment | 🛡️ Built-In Amazon/Shopify Fee Gross-Up | ☁️ Cloud SaaS Upload |
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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.
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.
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.
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.
If your landed cost increases by $2.00/unit and you raise your Amazon retail price by $2.00, Amazon's 15% referral fee takes $0.30 of that increase. You must gross up the pass-through amount by dividing by (1 - referral_fee_rate), or $2.00 / 0.85 = $2.35.
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