Customs bonds, and how to size one

A customs bond has three parties on it: you as principal, a surety company approved by the Treasury Department, and CBP. The form is CBP Form 301 and the conditions it incorporates sit at 19 CFR part 113. What you are buying is CBP's willingness to release cargo before the final duty is settled. If the duty, a penalty or a set of liquidated damages goes unpaid, the surety pays CBP and then comes to you for the money. You carry the loss either way. The bond only changes who waits.

When you actually need one

A bond is required on any formal entry. In practice that means:

• Commercial shipments above the informal entry limit of $2,500 at 19 CFR 143.21.
• Goods regulated by a partner agency (FDA, USDA, EPA, TTB, CPSC, DOT) or subject to an antidumping or countervailing duty order, regardless of value.
• Goods subject to quota, and anything entered under a warehouse, temporary import or in-bond procedure, which use custodial bond conditions rather than the basic importation ones.
• Your Importer Security Filing, which has to be secured either by your continuous bond or by a standalone ISF bond. See the ISF guide.

The end of the $800 de minimis exemption pulled a large volume of parcel traffic into entry filing that never needed a bond before. Sellers who shipped for years on Section 321 clearances now need one.

Single transaction against continuous

A single transaction bond covers one entry and is written for roughly the entered value plus duties, taxes and fees. Where the goods are subject to quota or to certain partner agency requirements, CBP sets it at three times the value instead, which is why a single food or textile shipment can carry a startling bond premium.

A continuous bond, activity code 1, covers every entry you file at every port for twelve months and renews itself until someone terminates it. The usual advice is that two or three entries a year justify going continuous. That is roughly right but it is the wrong test. The real question is your duty exposure, not your entry count, because that is what CBP prices the bond on.

The arithmetic CBP uses

CBP sets a continuous bond at 10% of the duties, taxes and fees you paid in the previous twelve months, with a floor of $50,000, rounded up to the next $10,000 increment while the result is at or below $100,000, and to the next $100,000 increment above that. The guidance sits in CBP Directive 3510-004. Pay $600,000 in duty over a year and ten per cent is $60,000, which is already on a $10,000 increment, so that is the bond. Pay $4.2 million and ten per cent is $420,000, which rounds up to $500,000.

Notice what the formula measures: last year. That was a reasonable proxy when tariff rates moved slowly. It is a poor one now. Section 232 duties assessed on the metal content of derivative articles by melt and pour origin, Section 301 rates on Chinese-origin goods, and the tariff actions taken under IEEPA can mean this year's duty on the identical bill of materials is a multiple of last year's. A bond sized on a trailing twelve months that predates the rate change is undersized on the day it is issued. If your product mix or sourcing moved, do the forward calculation yourself rather than waiting for the formula to catch up.

Stacking liability, and what saturation means

The bond term is twelve months. The liability is not. Every entry filed under the bond stays open until it liquidates and the liquidation becomes final. CBP normally liquidates inside a year and can extend that to four. Where liquidation is suspended under an AD/CVD order, entries routinely sit unliquidated for three years or more while Commerce works through an administrative review.

So a single $50,000 bond can be carrying three or four years of open entries at once. Add up the duty exposure on all of them and that total is your stacking liability. When it approaches or passes the face amount, the bond is saturated.

The surety usually notices saturation before CBP does, and the surety is the one who can stop writing.

A saturated bond does not fail with a warning. It fails when your surety declines the next entry or demands collateral, or when CBP issues an insufficiency notice.

What an insufficiency notice does

CBP's Revenue Division reviews bond sufficiency and issues a notice giving you a short window, measured in days, to put a larger bond on file. Miss it and the bond is rendered insufficient. Every entry transmitted against it then rejects in ACE. Nothing about your cargo has changed. It simply cannot be entered, so it sits, and demurrage and per diem run against you while you sort out paperwork.

Replacing a bond is not instant either. Bonds have been filed electronically as eBonds in ACE since 2015, and the new bond has to be transmitted, accepted and effective before entries flow again. Underwriting sits in front of that. This is the whole argument for watching the number yourself.

What the surety will want

Small continuous bonds are close to a commodity purchase. Above the $50,000 tier, the surety underwrites you: financial statements, how long you have been importing, what you import, and above all your AD/CVD exposure. Sureties have been badly burned by importers who walked away from retroactive antidumping assessments, so a new importer bringing in goods under an active order is the hardest risk to place and will usually be asked for collateral, typically an irrevocable letter of credit.

Terminating a bond does not clear the past. Under 19 CFR 113.27 the termination takes effect prospectively, and entries already filed stay secured by the bond that was in force when they were filed.