Trade policy can change faster than a supply base can. For manufacturers, the practical question isn’t predicting the next policy move. It’s knowing, at any moment, which parts and suppliers are exposed and what you can do about it. This checklist is the framework I use to structure that work.
Important: This is a general planning framework, not legal, customs or tax advice. Tariff classification, country-of-origin determination and duty treatment are technical and fact-specific. Confirm them with a licensed customs broker or qualified trade counsel.
The checklist
1. Map parts to suppliers to countries
Start with your bill of materials and purchase history. For every purchased part, record the supplier, the manufacturing location and the country of origin as reported on import documentation. Don’t stop at tier 1: a domestic distributor may be reselling an imported part.
2. Confirm classification and origin with experts
Duty rates depend on the product’s classification in the Harmonized Tariff Schedule (USITC) and on its country of origin. Work with your customs broker to confirm both. Binding rulings and past decisions are searchable through CBP rulings. For basics on the import process, CBP: Basic Importing and Exporting is a good primer.
3. Size the exposure in dollars
For each exposed part, estimate annual import value and apply a scenario duty rate. Keep the math simple and transparent:
Exposure ($) = annual import value × incremental duty rate
For example, under a hypothetical 25% incremental duty, a part with $250,000 of annual import value carries $62,500 of added cost per year. Run several scenarios rather than betting on one.
4. Flag single-source and long-lead parts
Exposure plus no alternative equals risk. Highlight parts that are single-sourced, have long lead times, or require customer or engineering approval to change suppliers. In aerospace and defense, qualification requirements can make a switch take a long time, so these parts need attention first.
5. Identify alternatives
List realistic options for each high-risk part: a second supplier in another country, a domestic source, a design change, or a different material. Note what qualification each option requires.
6. Compare total cost, not unit price
A lower piece price can lose once you add freight, duty, inventory carrying cost, quality costs and lead-time risk. The free Reshoring Initiative Total Cost of Ownership Estimator is a useful structure for this comparison and for evaluating reshoring.
7. Review contract and shipping terms
Who pays duty depends on how the deal is written. Under the ICC Incoterms® rules, for example, DDP (Delivered Duty Paid) places import duties on the seller, while other terms leave them with the buyer. Review price-adjustment and change clauses with your legal team.
8. Decide on inventory moves carefully
Buying ahead can soften a known cost change, but it ties up cash, warehouse space and obsolescence risk. Treat any pre-buy as a business case with clear limits, not a reflex.
9. Watch official sources
Policy details come from primary sources. Bookmark USTR Section 301 investigations, the International Trade Administration, and, for export controls, the Bureau of Industry and Security. The U.S. Census Bureau foreign trade data helps you see broader import patterns for your product categories.
10. Put it on a cadence
Tariff risk isn’t a one-time project. Fold the exposure map into your monthly S&OP or supply review: refresh the data, re-run scenarios, track mitigation actions and assign owners.
A simple exposure table to start with
You don’t need special software to begin. A spreadsheet or a small database table with these columns covers most of the checklist:
- Part number, description, annual quantity
- Supplier, manufacturing location, country of origin
- HTS classification (as confirmed by your broker)
- Annual import value
- Scenario duty rate and exposure in dollars
- Single source (yes/no), lead time, qualification required
- Alternative source, status, owner, next review date
Sorted by exposure, that table becomes a prioritized work list. With Python or SQL, it can refresh automatically from purchasing data, which is the kind of tool I like to build.
The mindset
The best supply chain teams I’ve worked with don’t react to every headline. They know their exposure, have options ready and make decisions on total cost and risk. A structured checklist turns uncertainty into a list of actions with owners. That’s a position of strength, whatever policy does next.
For a related framework and definitions, see the supplier risk section of my Knowledge Base.
Peter Klausz is an MBA, the founder of Statadventure, LLC, and a former Pratt & Whitney F100 supply chain manager. He builds supply chain software in Python and SQL with AI-assisted development and is open to contracting and new roles. Get in touch.