For US importers of goods made in China
Get back the duty and demurrage you should not have paid.
Send your CBP 7501 or your demurrage and detention invoice. Every line is checked against CBP's own tables and the carrier's published tariff, and you get what to claim, until when, and the letter to send.
Free while we open access. Your file is deleted after 7 days.
What comes back
entry_summary_7501.pdf
Entry date 2025-06-12, origin CN. 9903.01.24 line, duty printed $3,184.00.
Refund windowCBP CSMS 68340863 · CAPE
9903.01.25 line, duty printed $1,592.00.
Refund windowCBP CSMS 68340863 · CAPE
Liquidation status is not on the 7501. CAPE Phase 1 takes entries up to 80 days past liquidation: check it in ACE.
Check in ACE9903.88.03 Section 301 line, $3,980.00. Not an IEEPA duty.
StaysCBP CSMS 67834313
demurrage_invoice.pdf
arrival_notice.pdf
Discharged Thu 2026-07-02. Fri 2026-07-03 is the observed Independence Day holiday.
ReadUS federal holidays, OPM
The tariff counts free time in working days. Last free day: Thu 2026-07-09.
RecomputedCarrier's published US tariff
Invoice charges from 2026-07-07: three days inside free time.
3 days overDispute letter drafted with the basis and the tariff link.
Ready to sendExample with a fictional entry and invoice. Your answer is built from your own documents.
Two documents. Two kinds of money back.
You already have both papers. They hold everything needed to check what you paid.
Your CBP 7501 → the IEEPA refund
The Supreme Court held IEEPA does not authorize tariffs, and CBP refunds those duties through CAPE. The 7501 shows which of your lines qualify.
- Each 9903 line inside or outside the refund window
- The duty printed on those lines, entry by entry
- What CAPE Phase 1 accepts and what to check in ACE
- The tariff layers on your next shipment, with their status
Your D&D invoice → the dispute
Demurrage and detention invoices are often counted from the wrong day, on calendar days, or through holidays. The invoice and the arrival notice show it.
- The real last free day under the carrier's US tariff
- Each band re-checked against the tariff
- The basis for a dispute, with the carrier's own link
- A letter ready for you to send
A calculator, or your document?
The free calculators on this site answer one line at a time. Your document gets every line at once.
| A calculator, or your document? | Free calculator | Send the document |
|---|---|---|
| What goes in | A few numbers you type | The 7501 or the invoice, as printed |
| What is checked | One line | Every line, every entry, every band |
| Where numbers come from | CBP tables and the carrier tariff | The same, each with its source link |
| When something is unknown | It says "not checked" | It says "not checked" and asks for the paper that settles it |
| What you get | A result on the screen | A list of entries to file, or a dispute letter |
Free calculators and guides
Every figure on these pages comes from a primary source we link: CBP, the Federal Register, the eCFR, or the carrier's own tariff.
Refunds and tariffs
IEEPA, Section 301, Section 232, HTS
IEEPA tariff refund
The Supreme Court held IEEPA does not authorize tariffs. What CBP's CAPE refund process accepts, who can file, …
IEEPA tariff refund calculator
Enter the entry date, origin and the Chapter 99 lines of a CBP 7501. See which lines fall inside the IEEPA …
IEEPA tariff refund HTS codes
The Chapter 99 (9903) headings CBP used for IEEPA duties on goods from China, Hong Kong and Macau: rate, entry …
Stacking tariffs on Chinese goods
The order CBP wants Chapter 99 tariff numbers on a US entry summary (Section 301, 122, 232, 201), and a lookup …
Section 232 tariffs by product group
Section 232 tariffs by product group: proclamation, effective date, rate as stated and Chapter 99 heading, …
Section 301 China exclusions
The USTR Section 301 China exclusions: 178 extended through November 9, 2026, headings 9903.88.69 and .70, and …
Section 232 vs IEEPA tariffs
How Section 232 and IEEPA tariffs differ: legal basis, the Supreme Court ruling, stacking, USMCA treatment and …
Find an HTS code by description
Describe a product to get HTS codes to check, with the heading text from the US tariff schedule and CBP CROSS …
Demurrage and detention
Last free day, carriers, ports, disputes
Last free day for a container at a US port
Enter the carrier, the US port and the discharge date to find the last free day under the carrier's published …
Demurrage and detention dispute letter
Enter the carrier, port, dates and amount from a US demurrage or detention invoice and get a draft dispute or …
Demurrage and detention in the US
Find the last free day of a container at a US port, see which carrier tariffs we hold, and check a demurrage …
Demurrage vs detention
What demurrage, detention, per diem, storage, wharfage and quay rent mean on a US import invoice, who charges …
Who pays demurrage and detention
Incoterms split costs between buyer and seller, but the carrier bills by its own papers. What the FMC billing …
FMC demurrage and detention rules
FMC demurrage and detention rules for US imports: 46 CFR 545.5, part 541, charge complaints, and where each …
ISF and UFLPA
Filing, penalties, forced-labor screening
ISF filing requirements
Importer Security Filing (ISF 10+2) for ocean cargo to the US under 19 CFR part 149: who must file, the ten …
ISF filing checklist
A checklist of the ten ISF importer data elements from 19 CFR 149.3(a), a free check of your own data on the …
ISF late filing penalty
What counts as a late or inaccurate ISF, the $5,000 bond claim, CBP's mitigation amounts, cargo holds, and how …
ISF bond
Which bonds can secure an ISF (19 CFR 149.5), the stand-alone ISF bond, Form 301, the $10,000 and $50,000 …
UFLPA supplier check
Enter a supplier name to see whether it matches the DHS UFLPA Entity List or other screening lists we read. A …
UFLPA Entity List
The DHS UFLPA Entity List as a filterable table: entity name, the section of the Act it is listed under, and …
UFLPA detention notice
UFLPA detention: the 5 and 30 day periods in 19 CFR 151.16, the three paths (export, applicability review, …
Shipping from China to Amazon FBA
Who is importer of record when you ship from China to Amazon FBA, the ISF, duty layers, the de minimis …
How it works
No account to set up and no system to connect. You send a file; we send back what it shows.
Send the document
Upload the 7501, or the D&D invoice with the arrival notice. Email works too.
We read every field
The document type is confirmed first. Dates, ports, lines and amounts are read as printed and shown back to you.
Each line meets its source
9903 lines against CBP's refund headings and dates; free days against the carrier's US tariff and federal holidays.
You get the answer
What to claim and until when, or what was overbilled, with the letter. What could not be checked is said plainly.
The rules we work by
You are trusting us with numbers that become claims. So:
Numbers come from sources
The language model reads your document. It never makes a number: every figure is from a table we cite.
"Not checked" is an answer
If we have no row for a heading or a port, we say so. It is never shown as "not eligible".
Your files stay yours
Files are deleted after 7 days. No customer sees another's documents.
You stay in charge
We do not file in CAPE or send disputes for you. You or your broker do, with what we found.
Frequently asked questions
Are you a customs broker?
No. Purserhouse checks documents and shows what they mean against CBP's and the carriers' published sources. Only the importer of record or the broker that filed the entry can file in CAPE.
Do you file the refund or the dispute for me?
No. You get the list of entries and amounts, or the dispute letter. You or your broker send it.
Do you need access to my ACE account?
No. We read the documents you send. Liquidation status is not printed on a 7501, so we tell you exactly what to check in ACE.
Which carriers are covered?
Maersk, MSC, Hapag-Lloyd and ZIM US import tariffs. We found no public US demurrage and detention tariff for ONE; for ONE we use the free days and rates printed on your own papers.
Does the refund figure include interest?
No. CBP calculates interest under 19 CFR 24.36 and pays it inside the refund. We show the duty printed on your 7501.
What does it cost?
Nothing while we open access.
About Purserhouse
Purserhouse is built for small and mid-size US importers who buy from China and still handle part of the paperwork themselves, and for the customs brokers who serve them. It reads the documents you already have, a CBP Form 7501 or a demurrage and detention invoice, and checks them against CBP’s tables and the carriers’ published US tariffs. We also work in Chinese for forwarders and exporters who handle the same papers from the other side.