Duty Diligence reads the price, cost, HS code and country of origin you already keep in Shopify and works out the effective US import duty and landed margin for each variant. Every figure shows its source and date. Rates are rebuilt from the published tariff schedule twice a day and checked two independent ways; anything unresolved is flagged for review rather than shown as certain. When a rate changes - as with the August 2026 Canada duties - the dashboard flags what moved.

• Coverage report: which variants can be checked and which fields are missing
• Margin snapshot: price, cost, effective duty and landed margin per variant
• Twice-daily re-verification against USITC, CBP and Federal Register sources
• Changed-rate flags when a tariff action moves your numbers
• Source and date shown on every rate