Tariff Stacking 2026: Is Your Customs Bond Too Small?
Your continuous bond is sized at 10% of the duties you paid CBP in the last 12 months. That number used to move slowly. In 2026 it doesn't — Section 301 and Section 232 duties now land on the same shipment, and a $50,000 continuous bond that was comfortable in January can be insufficient by summer without a single new regulation being written specifically about bonds.
- The exact 4-layer stack CBP is billing importers in August 2026
- Which layers already expired — so you don't over-budget
- A premium table by bond size no customs broker publishes
- Who requires it: CBP (Monetary Guidelines, 19 CFR 113.13).
- Amount: Trailing 12-month duties, taxes, and fees x 10%, rounded up to the next $10,000, with a $50,000 minimum.
- Typical cost (estimate): $400-$1,000/yr for a $50,000 continuous bond. The surety sets the final price.
- The IEEPA tariffs ended February 24, 2026 and the Section 122 surcharge expired July 24, 2026, so neither layer belongs in a new bond calculation.
Is Your Bond Too Small? The 10% Test
Add up every duty, tax, and fee — base MFN rate plus any Section 301 and Section 232 layers — that CBP actually billed you on entries over the last 12 months. Multiply by 10%. If that figure is higher than your current bond's penal sum, your bond is undersized under CBP's own Monetary Guidelines, and ACE will flag it on the next automated sufficiency review whether or not you catch it first.
Formula source: CBP Monetary Guidelines for setting continuous bond amounts, applying the discretion CBP is granted under 19 CFR 113.13. Don't want to add it up by hand? Run your number in the customs bond calculator.
What Actually Stacks on Your Shipment in August 2026
Trade-policy authority shifted twice in five months this year, and a lot of bond-sizing content online still reflects the landscape from before either shift. Here is what is and isn't hitting your entries right now.
Standard HTSUS column-1 rate for the product classification — unaffected by any of the 2026 trade actions below.
4% blended rate on $2,000,000 entered value
The 2018–2019 List 1–4 duties on Chinese-origin goods, imposed under Section 301 of the Trade Act of 1974. Rates run 7.5%–25% by list.
25% on $1,000,000 of China-origin value
Imposed under Section 232 of the Trade Expansion Act of 1962. Rates vary by product under the current proclamation annexes (restructured in April 2026) — confirm the rate for your HTSUS code with your broker.
25% derivative rate on $400,000 of steel-content components
A separate Section 301 action addressing forced-labor import enforcement, effective July 24, 2026, on goods from dozens of countries that have not adopted or enforced a forced-labor import ban.
12.5% on $600,000 of value from a listed country
Terminated February 24, 2026, after the Supreme Court held in Learning Resources, Inc. v. Trump that IEEPA does not authorize tariffs. Do not include this layer in a post-February 2026 bond calculation.
Applied to entries before Feb. 24, 2026 only
The 10% global surcharge under Section 122 of the Trade Act of 1974 ran February 24–July 24, 2026 (its 150-day statutory limit), then expired and was replaced by Layer 4 above in the same minute.
Applied to entries Feb. 24–Jul. 23, 2026 only
The legal ground keeps moving. The Supreme Court terminated IEEPA-based tariffs in Learning Resources, Inc. v. Trump on February 20, 2026. The Court of International Trade separately invalidated Section 122's 10% surcharge on May 7, 2026, but the Federal Circuit stayed that ruling on May 12, 2026 pending appeal — a moot point once Section 122 expired on its own 150-day clock July 24, 2026. Section 301 and Section 232 duties, by contrast, rest on statutory authority Congress granted directly and have not been challenged on the same grounds. Budget for the two that are stable; recheck this page before assuming either has changed.
Worked Example: How Stacking Blows Through the $50,000 Floor
No single tariff program in this example is unusual on its own. It's the accumulation across four layers on the same $2,000,000 in annual entered value that pushes an importer who was comfortably under the bond floor into an insufficiency letter.
The Continuous Bond Formula
CBP Monetary Guidelines applying 19 CFR 113.13; the $50,000 floor and 10% test are CBP's standard method for a routine Activity Code 1 continuous bond.
| Duty Layer | Applied To | Adds | Running Total |
|---|---|---|---|
| Base MFN rate | 4% blended on $2,000,000 | $80,000 | $80,000 |
| + Section 301 (China, original) | 25% on $1,000,000 | $250,000 | $330,000 |
| + Section 232 (metals derivative) | 25% on $400,000 | $100,000 | $430,000 |
| + Section 301 (forced-labor, new) | 12.5% on $600,000 | $75,000 | $505,000 |
Illustrative example. Actual duty rates depend on your product's HTSUS classification and country of origin — confirm exact figures with your customs broker before filing.
Bond Requirement at $505,000 in Trailing Duties
Bond Requirement Increase
Previous Requirement
$50,000
New Requirement
$60,000
What Each Bond Tier Actually Costs
Once you know your new required penal sum, here's the premium range that tier typically commands — the number most customs brokers don't hand you until after you've already filed the increase.
Continuous Customs Bond Premium by Penal Sum
Indicative annual premium ranges — actual pricing depends on financials and compliance history
| Bond Amount | Trailing 12-Mo. Duty Range (10% Test) | Typical Annual Premium |
|---|---|---|
| $50,000 (floor) | Up to $500,000 | $400 – $1,000/yr |
| $75,000 | $500,001 – $750,000 | $450 – $1,400/yr |
| $100,000 | $750,001 – $1,000,000 | $500 – $2,000/yr |
| $150,000 | $1,000,001 – $1,500,000 | $650 – $2,800/yr |
| $250,000 | $1,500,001 – $2,500,000 | $900 – $4,500/yr |
| $500,000+ | $2,500,001 – $5,000,000 | Individually underwritten — financials required |
Premiums vary by surety, credit profile, and compliance history. $500,000+ bonds are typically underwritten individually and may require financial statements.
Penal sums and duty thresholds derived from CBP Monetary Guidelines (10% of trailing 12-month duties, $50,000 floor, rounded up to the next $10,000 increment).
What Happens When ACE Flags Your Bond
Official Federal Requirements
"CBP will periodically review each bond on file to determine whether the bond is adequate to protect the revenue and ensure compliance with applicable law and regulations... The principal will have 15 days from the date of notification to remedy the deficiency."U.S. Customs and Border Protection • 19 CFR § 113.13(c)
CBP's Automated Commercial Environment runs the same 10% test described above against every continuous bond on file, comparing it to each principal's trailing 12-month duty total. When your bond falls short, CBP notifies both you and your surety in writing and gives you 15 days to file a replacement bond at the correct amount.
Miss that window, or if CBP decides the shortfall puts revenue at meaningful risk, and 19 CFR 113.13 lets CBP demand immediate additional security — cash deposits or single transaction bonds on every entry — until the deficiency is resolved. That is materially more expensive and more disruptive than replacing the continuous bond proactively, because it applies per shipment instead of once per year.
The review cycle runs on CBP's schedule, not yours. Recalculating your own trailing 12-month total every time a new tariff program takes effect — like the July 24, 2026 Section 301 forced-labor duties — is the only way to catch an insufficiency before ACE does.
Ran the 10% test and came up short?
Replace your continuous bond at the correct penal sum before CBP's next sufficiency review finds it for you.
Get Your Bond Increase QuoteUpgrading Your Bond Before CBP Asks You To
Pull your trailing 12-month duty total
Your customs broker's ACE reports break out duties by program. Total the base MFN duty plus every active Section 301 and Section 232 line item — and drop any IEEPA or Section 122 line items dated before their respective end dates from your forward-looking projection.
Apply the 10% test yourself
Multiply by 10%, round up to the next $10,000, apply the $50,000 floor. The customs bond calculator does this instantly if you'd rather not do it by hand.
File the replacement bond, not a second bond
CBP authorizes only one continuous bond per activity per principal. Your new, larger bond replaces the existing one on file — it doesn't stack on top of it. Most replacement bonds at or near the $50,000–$100,000 range are quoted within one business day with minimal underwriting.
Set a recurring check, not a one-time fix
Tariff programs have shifted twice in 2026 already. If your import mix includes steel, aluminum, or copper content, or goods from a Section 301 list, re-run the 10% test whenever a new proclamation or Federal Register notice changes a rate — not just at your annual renewal.
Need the broader decision tree first — continuous vs. single entry vs. reconciliation rider? See the full customs bond comparison, or review the underlying 19 CFR Part 113 requirements.
Tariff Stacking Questions Importers Are Asking Now
Is the Section 122 10% tariff still stacking on my bond math?
Do I still need to account for IEEPA reciprocal tariffs when sizing my bond?
My imports aren't from China — can Section 301 still stack on my bond?
My combined duties came to $505,000 — why does CBP round my bond up to $60,000 instead of $50,500?
Will CBP tell me automatically if tariff stacking pushed my bond below sufficiency, or do I have to check myself?
Does Section 232 apply to my imports even if I don't import raw steel or aluminum?
More on Customs Bonds
Customs Bonds Hub
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Customs Bond Types Compared
Every CBP activity code, side by side
Customs Bond Requirements
19 CFR Part 113 explained for first-time importers
Reconciliation Rider Bonds
For post-entry duty adjustments and AD/CVD exposure
Single Entry Bond
For one-off shipments instead of a continuous bond
Customs Bond Calculator
Run the 10% formula against your own numbers
All content is researched from official state and federal sources (.gov). BuySuretyBonds.com works with Treasury-listed surety carriers.
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