TariffsChart

Calculator Methodology

This page only explains how the TariffsChart calculator organizes inputs, runs formulas, and hands off open questions for official-source or broker review.

This page is calculator methodology only. It does not promise any data-sync cadence, Federal Register turnaround, or real-time policy tracking.

1. What the calculator is for

The public calculator is a pre-shipment planning tool. It keeps goods value, logistics, duties, taxes, and margin assumptions in one estimate before you place a PO, quote a customer, or ask a broker for review.

Keep product, route, valuation basis, and quantity in a single estimate context
Separate base duty, additional tariff, import tax, and fixed fees instead of collapsing them into one opaque number
Produce a shareable estimate, CSV export, and broker-review packet

2. Formula and input boundary

The calculator does not decide the legally correct rate on its own. It performs transparent math on the values you enter or source. The formula boundary is:

Dutiable value

dutiable value = customs value (+ freight / insurance if your valuation basis requires it)

Estimated duty

estimated duty = dutiable value × base duty rate + dutiable value × additional tariff rate

Landed cost

landed cost = customs value + freight + insurance + duty + import tax + fixed fees

Suggested price

suggested price = landed cost ÷ (1 - target margin rate)

3. How one estimate is composed

This visual is illustrative only. It shows how the calculator organizes an estimate; it is not a real customs filing outcome or a fixed tariff stack.

Goods / customs value52%
Freight + insurance14%
Base duty field9%
Modeled additional tariff11%
Import tax + fixed fees14%

4. What the calculator does not decide for you

The following questions stay outside the calculator boundary and still require explicit review:

  • Final HS/HTS classification, binding-ruling outcomes, or scope decisions
  • Whether Section 301, Chapter 99, USTR exclusions, AD/CVD, quotas, or safeguards apply
  • Origin-rule analysis, valuation disputes, customs-value treatment, and Incoterms interpretation
  • Import-tax base, agency charges, brokerage fees, and other entry-specific charges
  • Any legal, tax, customs, brokerage, or accounting opinion

5. Review boundary

The value of TariffsChart is keeping assumptions, formulas, source links, and open questions in one place, not replacing review. Before relying on a high-stakes estimate, the workflow should at least:

Step 1

Confirm the product facts, classification assumptions, and origin assumptions

Step 2

Preserve the source URL, retrieved date, version or effective date, and confidence notes

Step 3

Leave additional duties, AD/CVD, quotas, and exclusions to official materials or a licensed customs broker

Tariff CalculatorOfficial-source researchDisclaimer & boundariesUSITC HTS ↗