Skip to main content
Tandom
How it works
About
Discuss a sourcing project →
Resources/Guides

Resource Center

Industrial sourcing and import guides

Primary-source-cited guides for US industrial sourcing and import teams. Build RFQs, compare manufacturers, evaluate landed cost, and investigate tariff and AD/CVD risk.

Topics
Tandom

Tandom helps US industrial buyers find, evaluate, and develop manufacturers across Asia and Latin America.

Discuss a sourcing project →

Proud to partner with

Microsoft for Startups

NVIDIA

Inception Program

Sourcing

  • How it works
  • What you receive
  • How engagements work
  • Discuss a sourcing project

Free tools

  • Tariff Calculator
  • AD/CVD Lookup
  • AD/CVD Catalog
  • HTS Catalog

Resources

  • Resource Center
  • Trade compliance guides
  • Roadmap

Company

  • About
  • Contact
  • Security
  • Accessibility
  • Public API status
  • Tandom Brasil ↗
For AI agentsllms.txtllms-full.txtConnect free import tools to your AIFree API overviewAPI reference

© 2026 Fintora Technologies Inc., d/b/a Tandom.ai. All rights reserved.

PrivacyTermsCookiesAcceptable Use

Made with ❤️ in São Paulo and San Francisco

Topics

11 guides

How to calculate US import duties

A working guide to the inputs, the layers, and the math behind a US entry summary in 2026. MFN, Section 232, Section 301, Section 122, AD/CVD, MPF, HMF, with a real worked example.

12 min read·Updated May 5, 2026

Read guide →

How Chapter 99 tariff layers stack on a single entry

How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. For brokers and compliance teams.

11 min read·Updated May 5, 2026

Read guide →

How Section 232 steel, aluminum, and copper duties apply in 2026

What changed April 6, 2026, what stayed the same, and how to file a steel, aluminum, or copper line in ACE without leaving duty exposure on the table.

13 min read·Updated May 5, 2026

Read guide →

How Section 301 China tariff exclusions work in 2026

What the 178 active Section 301 exclusions cover, how to claim 9903.88.69 on an entry, and what changes when the November 10, 2026 deadline passes.

11 min read·Updated May 5, 2026

Read guide →

What changed for low-value shipments after the de minimis suspension

What changed for low-value DTC and ecommerce shipments after Section 321 de minimis was suspended in 2025. Filing, fees, and duty math through 2027.

11 min read·Updated May 5, 2026

Read guide →

How to show landed cost at checkout for cross-border ecommerce

Implementation playbook for showing landed cost (duty + fees) at checkout after the August 2025 de minimis suspension. Decision matrix by volume, runnable Tandom API code, postal vs courier math, and a contrarian callout for when you should NOT integrate.

16 min read·Updated Aug 28, 2026

Read guide →

How to choose a duty calculation API for cross-border ecommerce

Honest provider comparison across Zonos, Shopify Markets DDP, Easyship, Passport, Avalara CrossBorder, and Tandom. Pricing, integration breadth, AD/CVD coverage, DDP guarantee fine print, and decision framework by use case.

13 min read·Updated Aug 28, 2026

Read guide →

The DTC import playbook after Section 321 ended

Nine operational steps from catalog audit to customer comms. Broker selection, ACE setup, entry-type decision, recordkeeping, and a worked transition timeline for a 80,000-order/month apparel brand.

15 min read·Updated May 7, 2026

Read guide →

Postal vs courier duty rules for low-value imports

How postal and courier shipments are duty-handled differently into the US. The Feb 28, 2026 ad valorem cutover, per-package math on a $30 phone case, and AOV-band decision framework.

11 min read·Updated May 7, 2026

Read guide →

How to qualify a product for USMCA preferential treatment

A practical guide to qualifying a product for USMCA preferential tariff treatment. Rules of origin, the 9 certification data elements, and a worked example.

13 min read·Updated May 5, 2026

Read guide →

How to subscribe to and triage CBP CSMS messages

How to subscribe to CBP Cargo Systems Messaging Service (CSMS) and triage the messages that change broker filing behavior, without losing the ones that matter.

12 min read·Updated May 5, 2026

Read guide →

Tandom

Tandom helps US industrial buyers find, evaluate, and develop manufacturers across Asia and Latin America.

Discuss a sourcing project →

Proud to partner with

Microsoft for Startups

NVIDIA

Inception Program

Sourcing

  • How it works
  • What you receive
  • How engagements work
  • Discuss a sourcing project

Free tools

  • Tariff Calculator
  • AD/CVD Lookup
  • AD/CVD Catalog
  • HTS Catalog

Resources

  • Resource Center
  • Trade compliance guides
  • Roadmap

Company

  • About
  • Contact
  • Security
  • Accessibility
  • Public API status
  • Tandom Brasil ↗
For AI agentsllms.txtllms-full.txtConnect free import tools to your AIFree API overviewAPI reference

© 2026 Fintora Technologies Inc., d/b/a Tandom.ai. All rights reserved.

PrivacyTermsCookiesAcceptable Use

Made with ❤️ in São Paulo and San Francisco