CALCULATOR
US Import Duty Calculator
Enter a 10-digit HTS code and country of origin to see the current stacked duty rate — MFN base, Section 232, Section 301, and IEEPA — in one place.
How US import duties stack in 2026
Every US import starts from its MFN base rate— the column-1 general rate published in the USITC Harmonized Tariff Schedule for the product's 10-digit HTS code. For many goods that base is low single digits, or Free.
Trade actions then stack on top: Section 301 (China-origin lists), Section 232 (steel, aluminum and derivatives), and IEEPA-based measures each add their own percentage, filed under a Chapter 99 (9903) subheading on the entry summary. The surcharges add together — a 3.4% base with a 7.5% Section 301 overlay and a 25% IEEPA overlay clears at 35.9%, not 25%.
Two worked examples from the live schedule: lithium-ion batteries (8507.60.0000) from China stack 3.4% + 7.5% + 25% = 35.9% — $35,900 of duty on a $100,000 shipment; hot-rolled steel sheet (7208.36) carries the 50% Section 232 rate regardless of a Free MFN base. Country of origin decides which overlays apply, and economy-wide measures can reach codes without per-code references — always verify against Chapter 99 notes before filing.
Popular HTS codes
Current stacked rates, updated daily from USITC.
Frequently asked questions
- What is an HTS code?
- An HTS (Harmonized Tariff Schedule) code is the 10-digit number the United States uses to classify every imported product. The first 6 digits follow the international HS system; the last 4 are US-specific. Your customs entry, duty rate, and any trade-action surcharges all key off this code.
- How do Section 301, Section 232, and IEEPA tariffs stack?
- Surcharges add on top of the MFN base rate, not instead of it. A product with a 3.4% base rate, a 7.5% Section 301 overlay, and a 25% IEEPA overlay pays 35.9% total. Each overlay is filed under its own Chapter 99 (9903) subheading on the entry summary, and country of origin decides which overlays apply.
- Is this calculator free?
- Yes — the calculator is free and requires no account. It shows the full stacked rate composition (MFN base plus each applicable trade action) and an estimated duty amount when you enter a shipment value. A free account adds per-code monitoring with email alerts when a watched rate changes.
- Where does the rate data come from?
- Rates come from the official USITC Harmonized Tariff Schedule, checked daily, with Chapter 99 trade-action overlays resolved against USITC subheading schedules. When the per-code schedule stops publishing an overlay reference, we say so on the code page rather than silently showing the bare base rate. The calculator is informational only — verify with a licensed customs broker before filing.