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Comparison

Gateway Tariff Calculator vs Flexport Tariff Simulator

Both are free tools that estimate U.S. import duty from an HTS code, a country of origin and a customs value. When we ran the same shipment through both on September 2, 2026 (women's cotton T-shirts from China, HTS 6109.10.0040, $10,000), each returned 36.50%.

They differ in what they show around the duty. The comparison below lists those differences as of October 6, 2026, from Flexport's public tariff pages and from this site. Features change, so check each tool before you rely on it.

Checked October 6, 2026

How they compare

Antidumping and countervailing duties

Gateway

Names the orders and open investigations that may cover the line, with case numbers and the published cash deposit rates where we hold them, and marks the estimate partial until the supplier and the written scope are confirmed.

Flexport Tariff Simulator

Its FAQ says it flags HTS codes that may be subject to antidumping or countervailing duties, so you can check the order language yourself.

Entry date

Gateway

Prices today's rates. Past and future entry dates are not supported.

Flexport Tariff Simulator

Its FAQ says it applies rates by entry date, with history back to January 1, 2025.

Rate updates

Gateway

Changes go live in the calculator and are logged on Tariff Radar, with email alerts to subscribers.

Flexport Tariff Simulator

Its FAQ says rates are updated within 24 to 48 hours of publication, and it keeps a changelog.

HTS reference pages

Gateway

1,350 HTS line pages, each priced live by the calculator, plus 96 chapter pages.

Flexport Tariff Simulator

An HTS catalog organized by section and chapter; its FAQ says the catalog displays the HTS code structure and descriptions.

Worked examples

Gateway

330 worked examples, priced live, so each one moves when a rate changes.

Flexport Tariff Simulator

Worked examples, each reflecting its stated entry date.

Ocean freight

Gateway

Shows the latest spot rate we read for a 40-foot container on the lane, with its date, next to the duty, and takes a request for a firm all-in quote.

Flexport Tariff Simulator

Not stated on its tariff pages.

Forced-labor detention risk

Gateway

Warns when a product from China falls in a DHS high-priority sector under the Uyghur Forced Labor Prevention Act, such as cotton, steel, aluminum and PVC.

Flexport Tariff Simulator

Not stated on its tariff pages.

AI assistants

Gateway

An MCP server lets Claude and other assistants that support MCP run duty calculations through the same engine.

Flexport Tariff Simulator

An AI Classification tool for finding HTS codes, marked New.

Try it on your own shipment

Calculate your duty

Run your HTS code, origin and value through the calculator.

Open the calculator

See worked examples

330 real shipments, priced live by the same engine.

Browse examples

Ship it with Gateway

Get a firm all-in ocean freight quote for your lane.

Get a quote

Questions importers ask

Do Gateway and Flexport give the same duty?

For the same HTS code, country of origin, value and date they should, because both start from the official Harmonized Tariff Schedule and the Chapter 99 trade actions. On the shipment we ran through both on September 2, 2026 (women's cotton T-shirts from China, HTS 6109.10.0040, $10,000), each returned 36.50%. Differences usually come from the entry date, an exclusion you claim, or antidumping and countervailing duties that depend on the supplier.

Which one shows antidumping and countervailing duty deposits?

Both point out possible antidumping and countervailing duties. Gateway also lists the case numbers and the published cash deposit rates where it holds them, and marks the estimate partial until the supplier and the written scope are confirmed. Flexport's FAQ says its simulator flags possible exposure for you to verify against the order.

Can I price a past entry date?

Not on Gateway, which prices today's rates. Flexport's FAQ says its simulator applies rates by entry date, with history back to January 1, 2025.

Can Gateway ship the goods as well?

Yes. Gateway is an ocean freight company. The duty result shows the latest spot rate we read for the lane, and you can ask for a firm all-in quote from the same page.

Is this comparison affiliated with Flexport?

No. Gateway wrote it from Flexport's public tariff pages as they read on October 6, 2026. Flexport and Flexport Tariff Simulator are trademarks of Flexport, Inc.

Sources

Flexport and Flexport Tariff Simulator are trademarks of Flexport, Inc. This comparison is Gateway's own, is not affiliated with or endorsed by Flexport, and reflects each tool's public pages on October 6, 2026. Duty figures are estimates, not customs rulings.