It rides on top of the duty
Two amounts are collected at the door, and only one of them is the tax. Recipients who budget for the duty alone are the ones who argue with a carrier over a difference the carrier did not set.
USPS international mail
USPS mail sitting at customs
There is a moment in every international mailing where the tracking page stops reporting on a network USPS runs and starts republishing whatever a foreign postal administration chose to send back. Most of the anxiety about a parcel at customs lives on the far side of that line. This page sets out what the postal rulebook actually promises there: who may ask, on which day, for how long, and what an inbound parcel with duty on it costs before it reaches a doorstep. Everything below was checked against the sources listed at the foot, all read 2026-07-31.
Manual sections citedDay counts, exactRead 2026-07-31
Two postal systems
An outbound item is handed from one administration to another. The tracking page rarely says which one is currently holding it.
Where the trail changes hands
Once an item leaves the country the receiving post carries it, clears it and scans it, and USPS republishes what that post reports. The manual is candid about the mechanism when it describes how an inquiry is resolved: the International Research Group “corresponds with the appropriate foreign post and advises the customer of the results by updating the customer's online inquiry.” Correspondence, in other words. Not a lookup, not a queue position, and not a lever.
This explains the pattern that alarms senders most: a long run of detailed scans inside the United States, an export event, and then either silence or a single foreign line repeated for two weeks. Nothing has gone wrong at that point. A different administration is simply scanning at whatever intervals its own network scans at, and some of them post one event per parcel until delivery.
It also sets the honest limit on what a phone call achieves. The rulebook gives the sender a formal route with dates attached, and that route is the thing worth using. Reading the same status line twenty more times is not a second route.
The window for asking, product by product
Section 921 of the USPS International Mail Manual, issue effective 12 July 2026 and read 2026-07-31, defines an inquiry as a request about the disposition of an item mailed to or from a foreign country, or a report of loss, damage, missing contents, improper delivery or return. Exhibit 921.2 then fixes who may raise one and when.
| Product | Who may raise it | Not before | Not after |
|---|---|---|---|
| Priority Mail Express International | The US sender only | 3 days, or the scheduled date of delivery | 90 days |
| Priority Mail International or registered mail | Sender or addressee, but only the US sender can start one online | 7 days | 6 months |
Two things in that table trip people up. The first is the floor: an inquiry raised on day two of a silence goes nowhere, because the rulebook does not accept it yet. The second is the ceiling, which is generous enough that senders forget it exists and then discover the door shut. Section 932 makes the consequence explicit on the money side, listing as a general exception to payment the case where no inquiry or application has been made within six months, counted from the day following the mailing.
Note also what is missing. The manual names the products an inquiry can be opened on and then states flatly that “Inquiries are not accepted for ordinary letters or M-bags.” That list is shorter than the international product catalog, so check the exhibit against the exact service on the receipt before assuming a route exists.
What to have in front of you
Section 921.31 sets out what an online inquiry needs, and it is more than a tracking number. Assemble it first, because the form does not save half-finished.
- The tracking number as it appears on the receipt, not as it appears in an email.
- The sender's name, mailing address, email address and telephone number.
- The addressee's name and mailing address, plus their email and telephone number where you have them.
- The mailing date, the weight, the postage paid and any additional fees.
- A description of the contents, written the way a stranger would need it rather than the way you think of it.
- Evidence of mailing and evidence of value. These are the two that people go hunting for at the worst moment, and a photograph of the receipt taken at the counter settles both.
Section 921.32 keeps a telephone route open on 800-222-1811 within the same limits, with the same documentation expected. Use it when the online form refuses the product or the account, not as a shortcut around the waiting period.
When the parcel is coming to you
Inbound is a different rulebook and a different bill. Section 712 requires the delivery office to collect a clearance and delivery charge from the addressee on every item where customs duty or Internal Revenue tax is collected, described as reimbursing the work of “clearing items through customs and collecting customs duties at the time of delivery.” The amount sits in the USPS price list rather than in the manual, so read it there rather than trusting a number quoted somewhere else.
It does not come back
The manual states the charge is not refundable by USPS even where customs later refunds the duty paid by the addressee. Winning the argument about the tax does not unwind the handling.
Three cases escape it
Dutiable articles from overseas US post office facilities, parcels delivered without duty collection under the manual's own exception, and items examined and passed free of duty. Anything cleared without an assessment is in the third group.
What that means in practice for a seller reading this: an overseas buyer's complaint about an unexpected amount is often not about duty at all, but about the handling that travels with it. Saying so at the point of sale costs a sentence. Our companion page on what a customs stop actually is covers the assessment side and the recipient's options for disputing it.
Rule out the boring explanation first
Before deciding a parcel is held abroad, check whether it was ever going to arrive. USPS publishes a list of destinations where it has stopped accepting mail, and on the day this page was written that list ran to more than a dozen countries, including Afghanistan, Belarus, Cuba, Haiti, Iran, South Sudan, Sudan, Venezuela and Yemen, most of them attributed to the unavailability of transportation rather than to any customs decision.
Items already inside the network when a suspension lands are turned around, and the page describes the endorsement staff apply: “Mail Service Suspended — Return to Sender.” There is money attached to that outcome, which almost nobody claims. USPS states that it “will, upon request, refund postage and fees on mail returned due to the suspension.” Upon request is the operative phrase; it is not automatic.
A second boring explanation, worth eliminating in the same minute: the item never entered the mailstream. A label bought and printed is not an item accepted, and an outbound piece with no acceptance event has not reached any customs office anywhere. Our note on reading a silent tracking page covers how to tell the two apart.
Sources for everything above
- USPS, International Mail Manual section 921 — the definition of an inquiry, Exhibit 921.2 with its day limits and footnotes, the information an inquiry requires, the telephone route and the International Research Group's correspondence with the foreign post. From the issue effective 12 July 2026; read 2026-07-31.
- USPS, International Mail Manual section 932 — the six-month bar where no inquiry or application has been made, counted from the day following the mailing. Read 2026-07-31.
- USPS, International Mail Manual section 712 — the clearance and delivery charge on dutiable inbound items, the three exemptions and the non-refundability wording. Read 2026-07-31.
- USPS, International Service Alerts — the suspended destinations, the return endorsement and the postage refund on request. Read 2026-07-31.
Suspension lists change without notice and the manual is reissued, so check the current text before counting a deadline off this page. SMKlog prints parcel labels for movements inside the United States and sells no international product, which is why this page cites the rulebook instead of a price.
Common questions
Who is allowed to open a USPS international inquiry?
The mailer in the United States, in almost every case. The manual restricts the expedited international product to the US sender, and although it lists Priority Mail International and registered mail as sender or addressee, a footnote adds that only the US sender can start one online. A buyer overseas who wants the item traced has to ask the person who mailed it.
How many days before USPS will look at an international parcel?
The manual sets a floor and a ceiling for each product. On the expedited international product it is no sooner than 3 days, or the scheduled date of delivery, and no later than 90 days. On Priority Mail International and registered mail it is no sooner than 7 days and no later than 6 months. Both counts run from the mailing date.
Does USPS decide when a parcel clears a foreign customs office?
It does not, and the manual says as much in describing the process: its International Research Group corresponds with the foreign post and reports back what that post says. The scans you are refreshing after export are a second administration's data arriving second hand.
Is there a charge on an inbound parcel that customs assessed?
Yes, and it is separate from the duty. Post offices collect a clearance and delivery charge from the addressee on each item where customs duty or Internal Revenue tax is collected, to cover the work of clearing and collecting. The manual states it is not refundable by USPS even if customs later refunds the duty itself.
What if the destination country is not the problem?
Check the suspension list before opening anything. USPS publishes destinations where it has stopped accepting mail, and items already in the network come back endorsed Mail Service Suspended, Return to Sender. Postage and fees on mail returned for that reason are refunded on request.