New and increasing import tariffs are reshaping what U.S. importers are required to have on file for their U.S. Customs Bond. As duty rates rise, continuous bonds that once met U.S. Customs and Border Protection’s (CBP) minimum sufficiency threshold are falling short, triggering Demands for Increased Bond and leaving importers exposed to shipment holds and costly single-entry alternatives. Understanding how bond sufficiency is calculated, and what triggers a review, can help importers and their brokers stay ahead of enforcement.
Key Takeaways
- CBP requires that a continuous customs bond be set at a minimum of 10% of total duties, taxes, and fees paid in the prior year, or $50,000, whichever is greater. (Source: CBP Bond Directive 99-3510-004)
- In 2025, CBP scrutiny of bond sufficiency impacted more importers due to the rise in tariff rates, as well as new tariff schedules introduced on imports from multiple trading partners.
- Insufficient bond amounts can result in CBP triggering a formal demand for a bond increase — and potential holds on future entries until the issue is resolved.
- The national median annual bond amount for high-volume importers increased substantially between 2022 and 2025 as tariff obligations accumulated on previously duty-free or low-duty goods.
- A continuous bond, which covers all entries made in a 12-month period, is almost always more cost-effective than purchasing single-entry bonds for each shipment when a company imports more than a handful of times per year.
Why Customs Bond Amounts Are Under Greater Scrutiny
A U.S. customs bond is a financial guarantee between an importer (the principal), a surety company, and CBP. It assures the government that the importer will comply with all CBP regulations and pay any duties, taxes, and fees owed on imported merchandise.
For most commercial importers, a continuous customs bond, which covers all shipments made during a 12-month period, is the standard choice. CBP sets the minimum bond amount based on its sufficiency standard: The bond must equal at least 10% of all duties, taxes, and fees paid in the prior 12 months, with a floor of $50,000.
The problem: When tariff rates rise sharply, the duties owed on goods can increase dramatically in a short period. If a bond was set based on last year's lower duty obligations, it may quickly fall out of compliance with the 10% rule — without the importer realizing it.
What Happens When CBP Deems a Continuous Bond Insufficient?
CBP classifies a customs bond as either sufficient or insufficient — there is no graduated tracking in between. A bond becomes insufficient once an importer's duties, taxes, and fees exceed 100% of the bond's capacity.
When this happens, CBP can issue a formal Demand for Increased Bond. Until the importer resolves the issue, CBP may place holds on future shipments entering under that bond. In some cases, the importer may be required to post single-entry bonds on every shipment in the interim.
It's important to note that an insufficient bond cannot simply be corrected or amended. The existing bond must be terminated and replaced with a new, larger bond — a process that can take time and introduce additional administrative burden.
The cost and disruption of managing individual single-entry bonds at scale, combined with the process of terminating and replacing an insufficient bond, can make proactive bond sizing a better option.
Which Tariff Programs Are Most Responsible for Increased Bond Requirements?
Section 301 tariffs on Chinese imports, which have been in place since 2018 and remain active — continue to drive elevated duty obligations for importers sourcing goods from China. Section 301 duties can range from 7.5% to 25% or more, dramatically increasing the total duties paid annually by affected importers.
Section 232 tariffs on steel and aluminum have similarly increased total annual duty obligations for manufacturers and fabricators who import raw materials.
Tariff changes in 2025, 2026, and beyond – In 2025, the administration expanded tariff coverage to additional product categories and trading partners, broadening the universe of importers who may need to revisit their bond amounts under the International Emergency Economic Powers Act (IEEPA). The U.S. Supreme Court ruled IEEPA tariffs are illegal in February 2026. IEEPA tariffs have been removed, but the administration quickly implemented tariffs under Section 122. As mentioned above, 301 tariffs are expected to be implemented in 2026. Import tariffs are unlikely to return to pre-2025 levels.
Importers who have not reviewed their continuous bond amounts in the past 12 months should strongly consider doing so, particularly if their import volume, product mix, or sourcing countries have changed.
How to Calculate Whether Your Continuous Bond Is Sufficient
The basic CBP formula is straightforward:
- Total all duties, taxes, and fees paid on imports in the prior 12 months.
- Multiply that total by 10% (0.10).
- Round that figure up to the nearest $10,000 — or, for totals above $100,000, round up to the nearest $100,000.
- Your continuous bond must equal at least that amount, or $50,000 — whichever is higher.
For example, if a company paid $800,000 in import duties last year, its continuous bond should be at least $80,000. If the bond is currently set at $50,000, it is insufficient and the existing bond must be terminated and replaced with a new sufficient bond.
Importers who anticipate significant growth in dutiable imports — or who have recently added tariff-affected product lines — should project forward-looking duty obligations when sizing a new bond, not just rely on the prior year.
What Should Importers Do Now?
- Review current bond amount against prior-year duty, tax, and fee totals.
- Assess whether recent tariff changes have materially increased dutiable values on imported goods.
- Consult with a licensed customs broker or surety professional to determine whether a bond increase is warranted.
- Avoid waiting for a CBP Increase Letter — proactively adjusting a bond can be faster and less expensive and may avoid shipment disruptions.
Frequently Asked Questions
- How often should an importer review their customs bond amount?
- At minimum, importers should review their continuous bond at renewal time — which occurs annually. However, importers who experience a significant increase in import volume, dutiable goods, or who begin importing tariff-affected products should review their bond amount every six months rather than waiting for renewal. With the volatility in the trade environment, it is best practice for importers to continually monitor bond sufficiency.
- What happens if CBP determines my bond is insufficient?
- CBP will issue a formal written demand for a bond increase. The importer will have a specified period to respond. During or following that period, CBP may place holds on entries made under the bond or require single-entry bonds on new shipments.
- Is a continuous bond always the right choice over single-entry bonds?
- For most commercial importers, yes. A continuous bond typically costs between $400 and several thousand dollars per year depending on the bond amount, and it covers every shipment made during the 12-month period. A single-entry bond is priced at approximately 0.4% to 0.5% of the total entered value plus duties, with a minimum fee, per shipment. Importers who make even a few shipments per year typically find the continuous bond more economical.
- Who is liable if CBP files a claim against a customs bond?
- A customs bond is a three-party agreement. The importer is the primary obligor, making them the responsible party for all claims on the bond. The surety company guarantees the importer's obligations to CBP. If a claim is filed and paid by the surety, the surety has the right to seek reimbursement from the importer. This is why Customs bonds are fundamentally different from insurance — the importer remains responsible for underlying compliance and payment obligations. Lastly, if a bond pays out, that bond provider will terminate that bond.
- Can tariff changes affect an importer's bond even if the importer hasn't changed anything about their business?
- Yes. If the tariff rate on goods an importer already buys increases, the total duties paid will rise — even if import volume stays flat. This is one of the more common and overlooked scenarios that can result in a bond becoming insufficient without any change in the importer's sourcing or buying behavior.