Single Entry Bond for Customs: Complete Guide

A single entry bond is a one-time financial guarantee required by U.S. Customs and Border Protection (CBP) to cover the duties, taxes, and regulatory obligations on a single import shipment. Understanding how it works — and when to use it versus a continuous bond — directly affects your cost, your cargo release timeline, and your compliance risk on every formal entry you make.

What Is a Single Entry Bond?

Single Entry Bond (SEB): A customs surety bond issued under 19 CFR Part 113 that guarantees an importer will pay all duties, taxes, fees, and comply with all applicable CBP requirements for one specific import entry. It is discharged after that entry is liquidated — typically within 314 days of the entry date — and cannot be applied to any other shipment.

A customs bond functions as a three-party contract:

• Principal — the importer of record, who is legally responsible for the entry
• Surety — an insurance or bonding company authorized by the U.S. Department of the Treasury
• Obligee — CBP, on behalf of the U.S. government, as the beneficiary

When an importer defaults on duties or violates a trade law, CBP files a claim against the surety. The surety pays CBP, then pursues the principal for reimbursement. In this sense, a customs bond is not insurance for the importer — it is a financial backstop for the government.

CBP maintains the complete list of approved surety companies. The National Customs Brokers & Forwarders Association of America (NCBFAA) provides additional guidance on bond procurement for importers working through licensed brokers.

According to CBP data, over 35 million formal entries are filed in the United States annually. Nearly every one requires a customs bond, making this one of the most common yet least understood elements of the import process.

When Is a Single Entry Bond Required?

Under 19 USC 1484 and 19 CFR Part 113, a CBP customs bond is required for any formal entry — that is, any commercial shipment with a value exceeding $2,500. Informal entries (under $2,500) and certain personal-use shipments are generally exempt.

A single entry bond is appropriate in these situations:

• You import infrequently — fewer than roughly 3–4 times per year
• You are making a one-time or test shipment from a new supplier
• You are importing a high-value, single-shipment item such as industrial machinery, a vehicle, or project cargo
• You are importing goods subject to FDA, USDA, EPA, or other government agency review and want to manage bond liability per shipment
• Your shipment involves antidumping (AD) or countervailing duties (CVD), where each bond’s value must reflect the AD/CVD rate multiplied by the entered value

For importers making regular shipments — generally more than 3–5 entries per year — a continuous bond (which covers all entries for a rolling 12-month period) is almost always more cost-effective. Your licensed customs broker can help you evaluate which structure makes sense.

Search all CBP-licensed customs brokers to find a broker who can handle bond procurement and formal entry filing on your behalf.

How a Single Entry Bond Works: Step by Step

The process from bond procurement to bond discharge follows a defined sequence. Here is how it works in practice:

Step 1: Determine the Bond Amount

The bond must be set at a value no less than the total entered value of the goods plus all estimated duties, taxes, and fees. For AD/CVD shipments, CBP requires the bond to cover the full AD/CVD liability, which can be many multiples of the commercial value. Under 19 CFR 113.13, CBP may demand a higher bond amount if the standard calculation is insufficient to cover foreseeable liability.

Step 2: Obtain the Bond from an Approved Surety

Your customs broker or a licensed customs bond provider obtains the bond from a Treasury-approved surety company. The surety underwrites the bond based on your creditworthiness and the shipment’s risk profile. You pay a premium — typically 0.4%–0.5% of the bond’s face value, with most sureties setting a floor of $35–$50 per bond.

Step 3: File the Entry with CBP

Your customs broker submits the import entry through CBP’s Automated Commercial Environment (ACE) Portal, attaching the single entry bond to that specific entry transaction number. The bond is transmitted electronically in most cases; paper bonds are rare but still used at some land border ports.

Step 4: CBP Reviews and Releases the Shipment

CBP reviews the entry, applies the correct HTS classification (verify yours at hts.usitc.gov), assesses duties, and — if everything is in order — issues a release. The bond remains active and at risk from the moment of entry until liquidation.

Step 5: Entry Liquidation

Liquidation is CBP’s final accounting of the duties owed. It typically occurs within 314 days of the entry date, though it can be extended up to four years for complex entries or those under AD/CVD review. Once CBP liquidates the entry and confirms all duties are paid and no violations exist, the single entry bond is discharged.

Step 6: Discharge or Claim

If all obligations are satisfied, the bond is closed with no further liability. If there is a shortfall — unpaid duties, a penalty, or a compliance violation — CBP issues a demand letter to the surety, triggering a claim process under 19 CFR Part 172.

Single Entry Bond vs. Continuous Bond: Key Differences

Choosing the right bond type is a practical business decision. Here is a direct comparison:

For importers dealing with regulated goods — pharmaceuticals, food products, chemicals — a continuous bond often provides better protection against unexpected duty assessments across multiple entries. Browse brokers by specialty to find experts in your product category who can advise on bond strategy.

Regulatory Framework: The Rules That Govern Customs Bonds

The legal structure for customs bonds is found primarily in two places:

19 CFR Part 113 — “Customs Bonds” — is the primary regulatory authority. It defines the types of bonds, required terms, obligors, and conditions for bond sufficiency. Key subsections include:

• 19 CFR 113.11 — who may act as surety
• 19 CFR 113.13 — when CBP may demand a higher bond amount
• 19 CFR 113.62 — the standard terms of an importer/entry bond, including the duty to file accurate entry documents, pay duties, and comply with all trade laws

19 USC 1623 — authorizes the Secretary of the Treasury (and by delegation, CBP) to require bonds as a condition of any customs privilege or transaction.

For antidumping and countervailing duty shipments, the Enforce and Protect Act (EAPA) and the AD/CVD duty deposit requirements administered through the Antidumping/Countervailing Duty Orders database add another layer of bond liability. AD/CVD bonds are particularly high-risk because the final duty rate can be determined years after the entry, creating a gap between the bond amount and actual liability.

CBP publishes all binding rulings on tariff classification and valuation at rulings.cbp.gov — a critical resource if you are uncertain whether your goods face additional duty exposure that would affect your required bond amount.

Real-World Scenarios: Single Entry Bonds in Practice

Understanding the bond in abstract terms is one thing. Here are three concrete scenarios that illustrate how single entry bonds work — and where they can go wrong.

Scenario 1: First-time importer bringing in a commercial machine A small manufacturer imports a $40,000 CNC machine from Germany. The applicable duty rate under HTS is 3.5%, so duties are $1,400. The broker sets the single entry bond at $42,000 (entered value + duties, rounded). Premium: approximately $168–$210. The entry clears in two days, and the bond is discharged at liquidation 90 days later with no issues.

Scenario 2: E-commerce importer testing a new product from China An Amazon FBA seller places a $12,000 trial order for consumer electronics. The goods are classified under an HTS code subject to Section 301 tariffs (25%). Total duty exposure: $3,000. The broker prices the single entry bond at $15,000. Premium: approximately $60–$75. The importer decides the cost is manageable for a test shipment — if the product sells well, they will obtain a continuous bond for ongoing orders.

Scenario 3: AD/CVD exposure creates bond shortfall An importer brings in $30,000 worth of steel pipe from a country under a 150% AD/CVD order. The broker underestimates the AD/CVD liability and files a single entry bond at $50,000. CBP reviews the entry and determines the actual liability is $75,000. CBP issues a demand under 19 CFR 113.13 for the importer to file a higher bond or post additional security before releasing the shipment. The importer faces a 72-hour delay and additional surety costs. This is the most common real-world single entry bond failure mode.

For importers at complex ports — Los Angeles, Houston, Miami, Chicago — working with an experienced broker who knows local CBP port director policies on bond sufficiency is essential. Browse brokers by U.S. port of entry to find specialists at the ports where your freight arrives.

Common Mistakes and Misconceptions

Even experienced importers make avoidable errors with single entry bonds. These are the most consequential:

Mistake 1: Undervaluing the bond Setting the bond at only the commercial invoice value, without accounting for duties and fees, leaves a gap that CBP can challenge. Always calculate: entered value + estimated duties + estimated fees = minimum bond face value.

Mistake 2: Assuming one bond covers multiple shipments A single entry bond is tied to one entry transaction number. If you have two shipments arriving in the same week from the same supplier, each requires its own bond.

Mistake 3: Ignoring AD/CVD exposure Many importers do not check the AD/CVD Orders database before sourcing from a new supplier. An AD/CVD order can multiply duty exposure by 100%–400% of the entered value, making the standard bond formula completely inadequate.

Mistake 4: Using the wrong HTS code An incorrect HTS classification leads to an incorrectly calculated duty estimate, which produces an undersized bond. Cross-check your HTS classification at hts.usitc.gov or request a binding ruling from CBP before your shipment ships.

Mistake 5: Treating the bond as “insurance” The bond protects CBP, not you. If CBP files a claim against your surety, the surety will seek full reimbursement from you. Maintaining accurate entry data and paying duties correctly is the only way to avoid bond claims.

For a broader look at what your customs broker should be doing to protect you from these risks, see 10 Core Duties of a Customs Broker Explained.

Tools and Resources for Single Entry Bond Compliance

These resources will help you or your customs broker manage single entry bonds correctly:

• CBP.gov — Official CBP portal for bond forms, approved surety lists, and entry filing guidance
• ACE Portal — CBP’s Automated Commercial Environment, where electronic bond filing and entry submissions occur
• hts.usitc.gov — Harmonized Tariff Schedule lookup to confirm correct duty rates for your goods
• rulings.cbp.gov — CBP Binding Rulings database for verifying HTS classification and valuation
• enforcement.trade.gov/adcvd — Check whether your product is subject to antidumping or countervailing duty orders before you size your bond
• ncbfaa.org — Industry association representing licensed customs brokers; useful for understanding professional standards

If you work with a third-party logistics provider that also handles customs clearance, review [3PL With Customs Clearance and Warehousing