Upload your customs entries. See what you overpaid. Line by line.
Kynthar reads your CBP Form 7501s and supplier invoices, prices every line against the duty rates in force on the day it cleared, and shows you each overcharge in dollars. First findings free, in minutes.
No card. No call. Findings in minutes.
- Flat fee. No contingency.
- Not a broker. Not a law firm.
- Every number clicks through to your document.
How the tariff check works
Step 1
Upload
Drop in your entry summaries (CBP Form 7501) and the supplier invoices that go with them. PDF scans, ACE exports, CSVs, or spreadsheets all work. 90 days of entries is a good start.
Step 2
Minutes, not weeks
Kynthar reads every line and prices it against the duty rates in force on its entry date: Section 301 and its exclusions, Section 232 tiers and content rules, the Section 122 surcharge, and how they stack.
Step 3
A line-by-line report
Each finding shows what you paid, what applied, the difference in dollars, and the deadline to recover it. Every number clicks through to the exact line on your document.
What the report finds
An entry is priced once, on the day your broker files it. The rules kept changing after. The report checks every line against six error classes:
Missed Section 301 exclusions
178 exclusions run through November 10, 2026, and they are written as product descriptions, not just codes. Kynthar matches your invoice line descriptions against the exclusion language and flags lines where the exclusion was never claimed. Missed exclusions are recoverable after the fact.
Section 232 tier and value errors
The Section 232 rules were rewritten on April 6 and again on June 8, 2026: full customs value instead of metal content, new rate tiers, and the content-threshold changes from June 8. The report checks each line against the version in force on its entry date.
The Section 122 surcharge, stacked where it should not be
The 10 percent surcharge does not apply to goods already covered by Section 232. The report flags lines where it was charged anyway, and shows your total Section 122 exposure while the courts decide its fate.
Classification deltas
When a line's duty rate disagrees with how comparable goods enter, the report flags the difference in dollars as a review candidate for your broker.
IEEPA lines still owed a refund
Lines carrying the struck-down IEEPA codes are flagged with their CAPE refund eligibility and the window that applies. CAPE handles the IEEPA math; it cannot rule on classification, valuation, or missed exclusions. The report covers both.
Drawback never claimed
If you export, duties on Section 301 goods can be recovered up to five years back. The report flags the candidates.
What you upload
Two kinds of paper, both already in your possession:
Entry summaries (CBP Form 7501). The form your customs broker files with CBP for each import: the lines, values, codes, and duties for that entry. Your broker can send you copies, or you can pull them from your ACE account.
Supplier invoices. The invoices behind those entries. They carry the product descriptions and values the duty math depends on, and they are how the report catches exclusion misses and value errors the entry alone cannot show.
No clean-up needed. Send what you have; the checker tells you what is missing.
Your documents stay yours.
- Encrypted at rest with AES-256 server-side encryption.
- Your company's documents and findings are isolated from every other company's.
- Ask us to delete everything and we will. One email, gone.
- We never sell your documents, and we do not train AI models on them.
Every number traces to your documents
A dollar figure you cannot verify is worthless. So every number in the report clicks through to the exact line on your own document: the entry line it came from, the rate that applied on that date, and the arithmetic in between. Check any finding yourself in one click.
We are not a law firm and not a customs broker. We do not file claims, and we never take a percentage of your refund. The report is unconflicted: its only job is to be right.
What the free check shows
Flat fee. No contingency.
Free check
$0
Upload your entries. See your finding count, your largest finding in full, and the deadlines that apply. Minutes, not weeks.
Check my entries freeFull report
$299 one time
Every finding in dollars. The recovery path and deadline for each. An export your broker can act on. No findings, no charge.
Unlock the full report ($299)Monitoring
$199 a month
The duty rules changed seven times in the last twelve months. Monitoring prices every new entry as it arrives, re-prices your history on every rate change, and warns you before a recovery window closes.
Start monitoring ($199/mo)Recovery windows close on a schedule
300 days
A Post-Summary Correction reaches back 300 days from the entry date, and no later than 15 days before liquidation.
180 days
A protest reaches back 180 days from the liquidation date, with no extensions.
5 years
Duty drawback on exported goods reaches back five years.
Recovery windows are set by statute. Entries liquidate continuously, so the set of entries you can still correct shrinks every week. Rates and deadlines on this page are generated from the same effective-dated rate tables that price the reports, as of June 11, 2026.
Questions
How do I check if I overpaid tariffs?
Upload your entry summaries and supplier invoices. Kynthar prices every line against the duty rates in force on its entry date and shows each difference in dollars. The first findings are free and take minutes. If you want to start by hand, the Chapter 99 codes on each line of your 7501 show which programs were charged; the hard part is knowing what the rates were on that date, which is what the checker does.
What is CBP Form 7501 and where do I get mine?
It is the entry summary your customs broker files with CBP for every import: the lines, values, codes, and duties for that entry. Your broker can send you copies, or you can pull your entries from your ACE account. Upload what you have; the checker tells you what is missing.
Will this show my IEEPA refund?
Yes. The report flags entry lines eligible for an IEEPA refund through CBP's CAPE system and the window that applies to each. It also checks what CAPE cannot rule on: classification, valuation, missed exclusions, and stacking errors on the duties you are still paying today.
My broker missed a Section 301 exclusion. Can I still recover the duty?
Usually, yes. Exclusions apply retroactively: a Post-Summary Correction can fix an entry up to 300 days after entry, and a protest can challenge it up to 180 days after liquidation. The report matches your invoice descriptions against the exclusion language and shows which lines qualify and which window each is still inside.
How far back can I recover overpaid duties?
Three windows matter. A Post-Summary Correction reaches back 300 days from the entry date (and no later than 15 days before liquidation). A protest reaches back 180 days from the liquidation date, with no extensions. Duty drawback on exported goods reaches back five years. The report shows which window each finding is still inside as of the day you run it.
The Section 232 rules changed twice this year. Which version does the report use?
All of them, matched to your entry dates. Entries from before April 6, 2026 are checked against the metal-content rules; entries after are checked against full customs value, the new rate tiers, and the American-metal content threshold that moved from 95 to 85 percent on June 8. An entry is only priced against the rules that were in force the day it cleared.
What is the Section 122 surcharge, and can I get it back?
A surcharge on most imports that took effect February 24, 2026 and expires July 24, 2026. A federal trade court ruled it unlawful on May 7, 2026; that ruling is on appeal and the duty is still being collected. The report shows your Section 122 exposure line by line, flags lines where it was stacked on Section 232 goods it does not apply to, and shows the deadline to act on each so your rights are preserved however the appeal lands.
My broker handles all of this. What would the report add?
Brokers file entries against rules that changed four times in twelve months, and an entry is priced once, on the day it is filed. The report re-prices every line against the rules in force on its entry date. The most common findings are entry-level details: an exclusion that was not claimed, a value basis that changed mid-year, a surcharge stacked where the rules say it should not be. The report gives your broker the line-level evidence to correct them.
What does it cost? Do you take a percentage of my refund?
The first findings are free. The full line-by-line report is $299, one time, and if it finds nothing you pay nothing. Monitoring is $199 a month. We never take a percentage of your refund. Recovery firms typically charge 10 to 25 percent of what they find; on a $50,000 finding that is $5,000 or more.
Is my data safe? Is this legal advice?
Your documents are encrypted at rest with AES-256 server-side encryption, isolated from every other company's data, and deleted on request. And no: Kynthar is not a law firm and not a customs broker. The report identifies potential overpayments and the recovery path for each; filing runs through your broker, your counsel, or CBP directly.
Built on the engine that watches your whole procurement operation
The tariff check runs on Kynthar. Kynthar tracks every PO, shipment, contract, vendor, and item across your procurement operation. It reads every email and document that flows in, connects them, and tells your team what to act on before money moves. Duty is one of the places money leaks; if you run procurement at a manufacturer, the same engine watches all of them.
Kynthar is not a law firm and is not a licensed customs broker. The tariff check identifies potential duty overpayments and the recovery path for each finding; filing runs through your customs broker, your trade counsel, or CBP's own systems. Nothing on this page is legal advice.