Most importers think about a customs bond once — when a broker asks for one before the first shipment clears. Two things prove that assumption wrong. The first is Importer Security Filing (ISF), a separate filing with its own deadline that catches first-time ocean importers off guard. The second is what actually happens if CBP decides a bond condition wasn't met: a written claim, a dollar figure, and a clock that starts running whether or not you noticed anything went wrong. For how the bond amount itself gets set, see our guide on Continuous Bond vs. Single Entry Bond — this piece picks up from there.
Quick look
- ISF ("10+2") is a separate filing from your entry paperwork, due at least 24 hours before your cargo is loaded at the foreign port — not 24 hours before it arrives in the US.
- A Continuous Bond with Activity Code 1 typically covers ISF as well as entry, but the filing itself is still a distinct step with its own deadline. If you only hold a Single Entry Bond, ISF isn't covered and needs its own bond.
- CBP's opening liquidated damages figure for a late, inaccurate, or missing ISF is $5,000 per violation, capped at $10,000 per entry.
- A liquidated damages claim isn't a final bill. Importers can petition CBP for mitigation, and the amount collected is often reduced from CBP's opening figure.
[Photo placeholder — company-provided: Orientwings team reviewing an ISF filing deadline on a shipment calendar]
What ISF Actually Requires, and When
Importer Security Filing applies to ocean shipments headed to the US. It's commonly called "10+2" because the importer (or their agent) files 10 data elements — things like the seller, buyer, and manufacturer of the goods, and the container stuffing location — and the carrier files 2 more. The filing has to reach CBP at least 24 hours before the cargo is loaded onto the vessel at the foreign port, which means the deadline lands well before the shipment even leaves Asia, not before it arrives in the US.
This is where the timing catches people out. A buyer who is used to thinking about compliance paperwork as something handled "before the shipment clears customs" can miss that ISF has to be filed before the vessel even departs — often before the buyer has finished confirming every detail of the order.
Does Your Bond Already Cover ISF?
A Continuous Bond written with Activity Code 1 generally covers both the entry of your merchandise and your ISF obligation — one bond, not two separate ones. But "covered by the same bond" and "automatically filed" are different things. The bond backs the obligation financially; it doesn't file the paperwork for you. If your customs broker or freight forwarder isn't explicitly handling ISF as part of your booking, it's worth confirming who is.
Importers who only use a Single Entry Bond — because they import occasionally, per our earlier piece on bond types — don't get ISF coverage from that bond. Ocean shipments still need ISF filed, which typically means a separate ISF bond, with a minimum around $10,000 for a single-transaction version.
What Happens When CBP Makes a Claim
A bond claim starts with a written notice. If CBP determines a bond condition was breached — a late or inaccurate ISF, missed documentation, merchandise not redelivered on demand — it issues a notice to the importer (and the surety) identifying the bond, the condition it says was breached, and the dollar amount claimed. For ISF specifically, that opening figure is $5,000 per violation, with a $10,000 cap per entry if both a late filing and inaccurate data show up on the same shipment.
That notice isn't the end of the process. Importers can file a petition for relief, asking CBP to cancel or reduce the claim — and in practice, the amount CBP actually collects is often lower than the opening figure, particularly for a first violation with no pattern of repeated issues. If the importer doesn't resolve the claim, CBP can demand payment from the surety directly; the surety is on the hook up to the bond's value, and then typically seeks reimbursement from the importer.
The practical takeaway: a bond claim is a process with an off-ramp, not an automatic bill — but the off-ramp requires responding to the notice, not ignoring it.
Where This Fits Into a Shipment
None of this changes what a bond is for — it's still the same guarantee to CBP described in our Continuous Bond vs. Single Entry Bond piece. What changes is when it actually gets tested: ISF tests whether the right paperwork reached CBP on time, before the ship even sails, and a liquidated damages claim tests what happens after something was missed. Knowing both exist — and that there's a response process for the second one — is the difference between a manageable correction and a surprise on an invoice months later.
Common questions from importers
Do I need to file ISF if I'm shipping by air, not ocean?
No. ISF applies to ocean shipments. Air cargo has its own advance manifest requirements, but they aren't the same filing or the same 24-hours-before-loading deadline.
If my broker handles my customs entries, do they automatically handle ISF too?
Not automatically — it depends on what's included in your arrangement with them. It's worth confirming explicitly rather than assuming, since ISF has to be filed before the vessel loads, earlier than most people think to check.
We got a liquidated damages notice for a late ISF. Is $5,000 final?
Not necessarily. CBP's notice states its opening figure, but importers can file a petition for relief, and mitigated amounts — especially for a first, isolated violation — are often lower than the initial claim. Responding within the timeframe on the notice matters more than the exact number on it.
Can CBP go after our bond for something that isn't ISF?