Tariff Landed-Cost Calculator
A small Shopify seller importing phone cases from Shenzhen used to pay $0 in duty on any order under $800 thanks to the Section 321 de minimis exemption — as of August 29, 2025 that exemption is suspended for every country, so the same order now carries an HTS-classified duty rate (often stacked with Section 301 China tariffs), a Merchandise Processing Fee, and $15-25 in formal-entry brokerage per shipment. The calculator takes a product's cost, country of origin, and either an HS code or a plain-language description, looks up the applicable duty rate from the USITC Harmonized Tariff Schedule, adds MPF/HMF and a brokerage estimate, and spits out a true landed cost per unit before the seller commits to a purchase order. A seller with 40 SKUs uploads their catalog once, sees which products are now unprofitable at their existing retail price, and re-prices or re-sources before reordering rather than discovering the hit on a customs invoice weeks later. The business also sells a pay-per-lookup option ($2-3/calculation) for one-off importers who don't need a subscription, mirroring how Zonos charges per-order for its guaranteed landed-cost API.
Real, urgent, dated pain with a huge and newly-created buyer pool, but the calculation engine has to be genuinely accurate or you create liability — this is a credibility business, not a quick scrape-and-launch.
Zonos monetizes its landed-cost API by charging $2 plus 10% of the duties/taxes/fees per order and structuring it as a 'guaranteed' calculation where they eat the risk of being wrong — you can borrow that trust signal on a smaller scale by publishing your own margin-of-error and refund policy for miscalculations, which turns accuracy into your marketing headline instead of a hidden liability. A second revenue lever: sell an 'HS code audit' as a one-time paid service ($75-150) for sellers who suspect they've been misclassifying products for years, since a wrong HS code is a compliance risk CBP actively penalizes, not just a pricing problem.
Spikes ahead of Q4 holiday restocking (Aug-Oct) when sellers place their biggest purchase orders of the year.
Suits you if
- ✓You can read and stay current on CBP/USITC tariff notices without your eyes glazing over
- ✓You're comfortable building or commissioning a no-code/API-based calculator rather than needing a huge custom app
- ✓You already have or can quickly build credibility in an e-commerce/dropshipping community to seed your first users
- ✓You're willing to publish clear accuracy disclaimers and iterate the model as tariff rules change
Skip it if
- ✕You want a 'set it and forget it' tool — tariff rates and de minimis rules are changing multiple times a year right now and the calculator needs constant updates
- ✕You're not willing to put in the research time to get duty math genuinely correct
- ✕You need fast, large revenue — this is a slow-build trust business, not a viral app
- ✕You're uncomfortable with the compliance liability of publishing cost estimates people will act on
Skills: Comfort with spreadsheet-level logic and API integration (no-code tools like Bubble/Retool work), enough trade-compliance literacy to read HTS schedules and CBP fee notices correctly, and basic subscription-SaaS marketing (content/SEO into import/dropshipping communities, not paid ads first).
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