✓ 29,590 US HS codes currently active Updated daily · USITC Free · No signup

What’s the real US import duty
on your shipment?

The base MFN rate is just the start. In 2025–26, Section 232, Section 301, and IEEPA stack on top — often adding 150%+ for Chinese goods.

Chinese EV — HS 8703: 2.5% base → +25% Section 232 → +25% Section 301 → +145% IEEPA = 197.5% total
197.5%
Total Duty
Example
8703.23.00 — Motor vehicles for transport of persons (excl. buses), spark-ignition, 1,500–3,000cc
Base MFN rate2.5%
+ Section 232 (passenger vehicles)+25.0%
+ Section 301 List 1 25%+25.0%
+ IEEPA 145% — CN+145.0%
Total duty197.5%
Base rate from USITC HTS (updated daily). Section 232 at 4-digit heading level. IEEPA reflects 90-day pause as of 2025-04-09. Not legal advice — verify with a licensed customs broker before filing entries.

How US import duties stack in 2025–2026

The US applies tariffs in layers. Each authority is independent and cumulative — a single shipment can be hit by all four at once. The real landed cost is the sum of every layer that applies to your product and its country of origin.

Base MFN Rate

The standard most-favored-nation rate in the USITC Harmonized Tariff Schedule. Applies to all WTO members. Ranges from 0% to 37.5% depending on product.

0%–37.5%
Section 232

National-security tariffs under the Trade Expansion Act. Covers steel (chapters 72–73), aluminum (chapter 76), and passenger vehicles (8703) from all origins.

+25%
Section 301

Retaliatory tariffs on ~12,000 HTS codes from China only. Lists 1–3: 25%. List 4A: 7.5%. Applied at the 6-digit HTS subheading level.

+7.5%–25% (CN only)
IEEPA

Executive-order reciprocal tariffs. China: 145%. All other countries: 10% during 90-day pause (extended through 2026). USMCA goods from Canada/Mexico: 0%.

+10%–145%

What tariffdiff shows that others don’t

Most duty calculators only show the base MFN rate — which is just the starting point. In 2025–2026, the stacked layers matter more than the base rate for most Chinese goods.

Duty layer tariffdiff Other calculators
Base MFN rate (USITC, updated daily) ✓ ✓
Section 232 — steel, aluminum, passenger autos ✓ Often missing
Section 301 — China goods (~12,000 HTS codes) ✓ Often missing
IEEPA reciprocal tariffs (2025–2026) ✓ Current rates Usually absent
Total landed duty (automatic sum) ✓ Manual math required
Price Free · No account $0.15–$0.50 per lookup

Frequently asked questions

What is the total tariff rate on Chinese imports in 2025?
For most goods from China, the total US import duty in 2025–2026 is: base MFN rate (product-specific, e.g. 2.5% for passenger cars) + Section 301 rate (7.5%–25% for covered goods) + Section 232 if applicable (25% for steel, aluminum, autos) + IEEPA (145% on all Chinese goods). For a typical Chinese manufactured good, expect 155%–197%+ total duty.
What is Section 301 and which products does it cover?
Section 301 of the Trade Act of 1974 authorizes the USTR to impose retaliatory tariffs on countries with unfair trade practices. Current Section 301 tariffs target Chinese goods specifically across ~12,000 HTS subheadings: List 1 ($34B, 25%), List 2 ($16B, 25%), List 3 ($200B, 25%), and List 4A ($300B, 7.5%). Use the calculator above to check your specific HTS code.
What is the IEEPA tariff rate and does it apply to my country?
IEEPA (International Emergency Economic Powers Act) tariffs were imposed by executive order in 2025. Current rates: China = 145%, Canada and Mexico (USMCA-qualifying goods) = 0%, all other countries = 10% during the 90-day pause (extended through 2026). These are additional duties stacked on top of all existing tariffs.
How do I find my HTS code?
Use the "Search by product" tab above and type a plain-English description of your product. The search covers all 29,000+ active US HTS codes from the USITC. Alternatively, the full Harmonized Tariff Schedule is at hts.usitc.gov. For formal rulings, CBP offers binding ruling requests (Form 484).
Are USMCA goods from Canada and Mexico exempt?
Partially. USMCA-qualifying goods from Canada and Mexico are exempt from IEEPA (0% instead of 10%). Section 232 also has quota arrangements for Canada and Mexico. Section 301 is China-specific and does not apply to Canada or Mexico. The base MFN rate applies to all origins. Use the calculator with origin CA or MX to see the exact stack.

tariffdiff exposes a Model Context Protocol server and REST API so agents can call the stack calculator programmatically.

{
  "mcpServers": {
    "tariffdiff": {
      "type": "http",
      "url": "https://tariffdiff.org/mcp"
    }
  }
}
calculate_duty(hts_code, origin_country)Full stack: base + 232 + 301 + IEEPA
lookup_tariff(hs_code)Base MFN rate by HS code
search_tariff(query)Full-text search by product description
tariff_stats()Coverage and freshness

REST: /api/calculate?hts_code=8703.23.00&origin_country=CN