Methodology and Sources
Every rate on this site is read from a published government schedule, and the release is named on the page.
What decides the rate
Duty rates are read at build time from the USITC export for release 2026HTSRev22, which covers 98 chapters and 35,805 rate lines. Fee values come from the CBP User Fee Table for FY2027: MPF at 0.3464% with a $34.58 floor and a $670.86 cap, and HMF at 0.125% on ocean cargo only. Where a layer cannot be verified line by line, the page says so and names the primary source rather than publishing an estimate; the official sources are linked in the table below and in the footer.
Where this goes wrong
This site is not a customs broker, a lawyer or a filing system. It is a planning tool, and the number it produces has to be confirmed before an entry is filed.
Inputs and assumptions
| Item | Value | Note |
|---|---|---|
| Duty rate source | USITC HTS, release 2026HTSRev22 | Read at build time from the official schedule export. The general rate column. |
| MPF | 0.3464% of entered value, min $34.58, max $670.86 | CBP User Fee Table, FY2027. The ad valorem rate is statutory; the floor and cap are adjusted each October. |
| HMF | 0.125% of entered value, ocean cargo only | CBP User Fee Table. Not charged on air freight. |
| Customs value | Transaction value, normally the price paid for the goods | Freight and insurance are not part of US customs value, unlike CIF jurisdictions. |
Questions this page answers
Where do the duty rates on this site come from?
The USITC Harmonized Tariff Schedule export, read at build time. The release number is published on every page and in the footer, so you can always tell which schedule a rate came from.
Where do the fee figures come from?
The CBP User Fee Table. The MPF ad valorem rate is statutory at 0.3464%; the floor and cap are inflation-adjusted each October, and this site uses the FY2027 values.
Does this estimate include anti-dumping duty?
No. Anti-dumping and countervailing duty are case-specific and can exceed every other layer combined, so they are outside the estimate by design. The calculator covers base duty, the Section 301 and 232 layers you enter, the merchandise processing fee and the harbor maintenance fee.
Data release: 2026HTSRev22. Content as of November 10, 2026. Found an error? Tell us and it gets corrected.