Duty Diligence

Landed cost and US import duty for Shopify sellers, worked out for you and kept current. Built by In The Park Consulting.

Duty Diligence shows the actual landed cost of every product after US import duty, and the margin it leaves you, from the cost, HS code and country of origin you already keep in Shopify. It reads the tariff schedule again twice a day, leaves out the duties that are no longer charged and shows the working behind every rate. There is a plain explanation of landed cost with a worked example.

32%base duty on a synthetic hoodie, before any trade action is added

+50%on 666 Canadian tariff lines since 22 August, USMCA or not

3US tariff regimes struck down, expired or created in the last six months

2×/dayevery rate read again from the published tariff schedule

If your prices were set more than a quarter ago, your landed margins have probably moved without you touching anything. The working behind the 32% is here.

Is your product on the Canada lists?

Enter an HS or HTS code - 6, 8 or 10 digits.

Try: hoodies · honey · wine · metal furniture · gym equipment

Checked against the three lists in U.S. note 51 to chapter 99 of the tariff schedule (Revision 20, read on 5 October 2026), which include the changes of 15 September (CBP CSMS #69851916), and against the import bans from 29 September in the annexes to Proclamations 11061, 11062 and 11063 (alcohol, dairy and motor vehicles). The duty applies to goods entered from 12:01 a.m. eastern on 22 August 2026 (CBP CSMS #69606660). Goods under the Section 232 duties are exempt on the dairy list only. Verify a single line at the source before acting on it. There is a plain-English note on what changes, and a category-by-category reading of which everyday products are on the lists and which are not.

What is the duty on your products right now?

Every product and origin the pipeline monitors has its own page, rendered from the latest run with the date on the number and the working underneath: US import duty by product and country of origin. There is also a single table of the same rates.

What the app does

Coverage report. How much of your catalogue can be checked, and which fields are missing where.
Landed cost and margin. Price, cost, effective duty, landed cost and margin per variant, updated twice a day, with the source and date on every rate. Free, no card needed.
Monitoring. Twice-daily re-verification, with changes flagged on the dashboard. $19 a month.

There is a worked example of a single rate, showing the 52% actually charged on a China-made hoodie against the 92% a literal reading of the schedule gives.

Every rate is computed two independent ways from the tariff schedule, and the two answers have to agree before it is marked verified. A duty layer still printed in the tariff text but no longer collected - the struck-down IEEPA duties, for example - is only excluded on documented evidence: a court ruling, a Federal Register action or a CBP notice. It is a screen that sits alongside your own judgement rather than a substitute for a customs broker.

Who is behind it

I'm Josh Hume, a product developer in West Yorkshire. I studied Sports Technology at Loughborough and have spent the 20 years since inventing, developing and licensing consumer products, including a kettlebell redesign licensed in the US. Importing my own products is where I learned that the duty rate is the least stable number in a landed-cost calculation. My hope is that fewer sellers find out about a rate change from their accountant, months after it happened!

Where to get it

The app is live on the Shopify App Store. The snapshot plan is free with no card needed, and it works from fields you already keep in Shopify, so trying it costs nothing but a few minutes. If you want to check a code that behaves oddly above, or have a question about how the rates are built, I'm happy to help.