Stop $800 ACE Flags: Section 321 Shipping Steps for U.S. DTC Brands

Section 321 de minimis is no longer a reliable duty-free shortcut for most U.S. imports. CBP has suspended broad de minimis treatment for a growing share of shipments, and ACE now automatically withholds release when the $800 threshold or origin rules are triggered. If your business built its shipping model on Section 321, you need formal entry infrastructure, HTS classification, a bond, and a named Importer of Record in place now.

TL;DR:

• Most shipments exceeding the $800 threshold or originating from excluded categories now require formal customs entry, ending the automatic duty-free treatment under Section 321.
• CBP’s ACE system automatically flags and withholds shipments that fail the aggregate valuation or ownership rules, making compliance infrastructure essential.
• Eligibility depends on strict interpretation of the “one person, one day” rule, with ownership documentation and origin verification critical to avoid aggregation issues.
• The statutory repeal of de minimis treatment is scheduled for July 2027, but enforcement actions since 2025 significantly restrict practical use of the exemption.
• Businesses should shift to bulk formal entry, establish bonded warehouses, or outsource compliance to avoid shipment holds and penalties.

Table of Contents

• What Is Section 321 Shipping and the $800 De Minimis Rule?
• Section 321 Timeline: Key Dates From 2024 to 2027
• Who Still Qualifies for the “One Person, One Day” Exemption?
• How Does ACE Enforce the $800 Threshold Now?
• What Compliance Steps Do Importers Need Now?
• Section 321 Shipping vs. Formal Entry: Which Costs Less?
• What Should Businesses Do About Section 321 Suspension?
• How Moreshores Handles Section 321 Compliance for You
• Why the Real Risk in 2026 Isn’t the Suspension Itself
• Get Compliant Before the Next Hold Hits Your Shipment
• Sources
• FAQ

What Is Section 321 Shipping and the $800 De Minimis Rule?

Section 321 shipping refers to the duty-free entry process authorized under 19 U.S.C. §1321, the statute that let low-value imports skip formal customs entry entirely. For more than a decade, this was the quiet engine behind fast, cheap cross-border e-commerce. The rule let one person import merchandise worth up to a set threshold, on one day, without paying duty or filing a formal entry.

The statute itself contains three separate authorities under 19 U.S.C. §1321(a)(1) through (a)(3). Most importers only ever interact with one: (a)(2)©, the de minimis exemption that applies specifically to low-value shipments imported by one person on one day. The other two subsections cover bona fide gifts and personal-use articles carried by travelers, which is a different category entirely and rarely relevant to commercial importers.

The dollar figure attached to that exemption did not start at $800. Congress raised it there through the Trade Facilitation and Trade Enforcement Act of 2015 (TFTEA), which lifted the previous $200 ceiling. That single change, effective in 2016, is arguably what made the modern direct-to-consumer import boom possible. A $200 limit barely covers a single mid-priced product from overseas. An $800 limit covers most consumer electronics, apparel orders, and small-batch retail goods, which is exactly why de minimis volume exploded after TFTEA took effect.

Not everything qualified, even at the height of the program. Certain categories were excluded from Section 321 treatment well before the 2025 enforcement changes:

• Merchandise subject to Partner Government Agency (PGA) requirements, including many FDA-regulated products, firearms, and certain agricultural goods.
• Goods already subject to antidumping or countervailing duty orders.
• Shipments requiring a formal license or permit regardless of value.
• Merchandise where the importer could not demonstrate genuine “one person, one day” ownership.

That last exclusion matters more today than it ever did, because CBP’s current enforcement posture is built almost entirely around testing whether the “one person” claim is real.

Section 321 Timeline: Key Dates From 2024 to 2027

The de minimis exemption did not disappear overnight. It has been unwound in stages, through a mix of executive action, CBP rulemaking, and legislation. Here is the sequence that matters for anyone shipping into the United States right now.

1. Early 2025: The administration issued executive orders targeting de minimis treatment for shipments originating in China and Hong Kong, citing enforcement concerns tied to fentanyl precursor shipments and mislabeled goods.
2. February 2025: CBP began implementing the first phase of restrictions specifically on Chinese-origin low-value parcels, a move industry analysts tracked closely as the first real signal that de minimis was politically unstable.
3. May 2025: Enforcement broadened, with CBP tightening manifest data requirements and increasing scrutiny on aggregation across multiple low-value shipments to the same consignee.
4. August 29, 2025: CBP moved to a much broader suspension of de minimis processing, extending well beyond China-origin goods and pushing far more volume into formal entry channels, according to operational guidance from e-commerce logistics providers tracking the shift.
5. August 2025: New civil penalty provisions tied to de minimis misuse took effect as part of the broader legislative package sometimes called the “megabill” in trade press coverage.
6. Through late 2025 and into 2026: CBP continued rolling out ACE Release 3 automated enforcement, which now flags and withholds shipments that fail the $800 aggregation test in real time rather than after the fact.
7. July 1, 2027: The statutory repeal date. Legislative reporting on the 2025 megabill indicates de minimis treatment for commercial shipments is set to end entirely on this date, closing the exemption that TFTEA opened a decade earlier.

Two distinct things are happening in parallel, and mixing them up will cost you money. The 2025 actions are administrative suspensions and enforcement escalations, implemented through executive action and CBP rulemaking. The July 2027 date is a statutory repeal, passed by Congress. That means even if litigation or a future administration rolls back some of the 2025 restrictions, the underlying legal authority for de minimis is still scheduled to disappear on a fixed date.

There is real litigation risk baked into this timeline too. Trade groups have challenged parts of the 2025 rulemaking, and CBP has issued interim guidance more than once in response. If you operate at meaningful volume, checking CBP’s own Section 321 Programs page monthly is not optional anymore. It is the only place changes get reflected before they show up as a hold on your shipment.

Who Still Qualifies for the “One Person, One Day” Exemption?

Even where de minimis technically survives for certain origins and categories, eligibility hinges on a rule that trips up more importers than any other part of the statute: “one person on one day.” CBP interprets this literally. The exemption applies to merchandise imported by a single owner or purchaser, valued in aggregate at $800 or less, arriving on a single day.

That sounds simple until you run an actual fulfillment operation. Say a domestic warehouse holds inventory for twelve different Shopify merchants and receives one container carrying goods for all twelve. Is that “one person”? According to CBP’s administrative ruling guidance on fulfillment warehouses, it depends entirely on how ownership is presented at the time of entry, not on who happens to operate the warehouse.

If the warehouse itself is the buyer and owner of record for unsold inventory, and each individual shipment to that warehouse does not exceed $800 per owner per day, the exemption can still apply. But if the warehouse is simply holding goods on behalf of twelve separate merchants who are the real owners, CBP can treat the aggregate value across all twelve as the relevant figure, not the per-merchant slice. That distinction has quietly ended a lot of fulfillment center business models that assumed warehouse ownership alone was enough.

Two quick scenarios show how this plays out:

A DTC brand shipping direct from an overseas factory to individual U.S. customers, each order under $800, structured as one sale to one named buyer per shipment, still has a reasonable claim under the “one person” test, assuming the origin and category are not otherwise excluded. A marketplace aggregator consolidating dozens of small merchant orders into bulk containers, declared under a single nominal consignee, is exactly the pattern ACE’s aggregation logic is built to catch.

Origin matters independently of all of this. Goods subject to Section 301 tariffs (most Chinese-origin goods across a wide range of categories), Section 232 (steel and aluminum-derivative products), or Section 201 safeguard actions, are currently excluded from de minimis treatment regardless of value or ownership structure. The same goes for anything requiring PGA clearance.

Pro Tip: Check your consignee and buyer fields before you ship, not after CBP flags them. If your fulfillment partner is listed as the consignee but the real economic owner is a merchant client, CBP’s aggregation logic may treat that merchant’s total volume as the relevant “one person” figure, not the warehouse’s. Get this documented correctly at intake, because retroactive fixes after a hold are far more expensive than getting the paperwork right the first time.

How Does ACE Enforce the $800 Threshold Now?

ACE Release 3 changed Section 321 filing from a mostly passive process into an active, automated gatekeeper. Under the current system, CBP’s Automated Commercial Environment checks aggregate value against the $800 threshold at the manifest level, in near real time, and generates specific disposition messages when something fails the test.

Filers and brokers now need to recognize three message types that show up constantly in ACE Release 3 processing: an SO hold indicates the shipment has been selected for further review and cannot proceed on the de minimis track. A 4M message flags a manifest mismatch, usually tied to inconsistent value or owner data across linked shipments. An SN529 or SN530 notice signals that the $800 aggregate threshold has been exceeded for the declared owner on that day, which automatically kicks the shipment out of Section 321 eligibility and into a formal entry requirement.

None of these are polite warnings. They are holds. A shipment carrying an SO or SN530 message does not move until someone files a formal entry behind it, which means your operational clock is now running on customs time, not carrier time.

Filers need specific data elements ready before a shipment even reaches the port, not after:

• The full 10-digit HTS classification code, not a category approximation.
• Accurate country of origin, verified against the actual manufacturing location rather than the shipping origin.
• Owner and consignee information formatted correctly for AMS or ABI submission, following CBP’s CATAIR and CAMIR data specifications, including proper “in care of” formatting when a fulfillment center is acting as agent rather than owner.
• Accurate declared value that matches commercial invoice documentation exactly.

Transport mode matters here too. ACE Release 3’s automated enforcement applies to air, ocean, rail, and truck manifests. International mail shipments still fall under a separate, narrower exception, which is part of why some smaller parcel volume has quietly shifted toward postal channels since mid-2025. That workaround has real limits on speed and reliability, and it is not a durable strategy for any business shipping meaningful volume.

What Compliance Steps Do Importers Need Now?

Once a shipment falls out of de minimis eligibility, either because it was suspended, aggregated, or excluded by origin, it needs the same infrastructure any formal commercial import requires. That is a bigger operational shift than most e-commerce businesses expect, because Section 321 let them skip building it in the first place.

Here’s what a formal entry actually requires:

• A customs bond, either a single-entry bond for occasional formal filings or a continuous bond if you are now filing regularly.
• A designated Importer of Record (IOR), a legal entity accountable for duties, accuracy of declarations, and compliance with CBP requirements.
• A complete commercial invoice showing accurate value, terms of sale, and buyer/seller details.
• The full 10-digit HTS classification and verified country of origin for every SKU.
• Importer Security Filing (ISF) submitted at least 24 hours before vessel loading, for ocean shipments specifically.
• Payment of the Merchandise Processing Fee (MPF) and, where applicable, the Harbor Maintenance Fee (HMF), on top of any duty owed.
• A customs broker relationship, since most importers without in-house trade compliance staff will need one to file correctly.

The enforcement risk on the other side of getting this wrong is not abstract. Reporting on the 2025 legislative changes confirms new civil penalty provisions tied specifically to de minimis misuse took effect in August 2025. Beyond formal penalties, the more common near-term risk is simpler and more disruptive: shipment holds that stall your entire inbound flow, cargo examinations that add days of delay and cost, and in repeated or severe cases, seizure.

Pro Tip: Run a 72-hour compliance audit before your next shipment cycle, not after a hold hits. Pull your top 50 SKUs by volume, map each one to its actual country of origin and 10-digit HTS code, and flag anything touching Section 301, 232, or 201 tariff exposure. That single exercise usually reveals which SKUs are quietly costing you the most in formal-entry friction.

If you are still running Section 321 style parcel flows for anything touching those tariff categories, you are operating on borrowed time, and probably borrowed goodwill with your broker.

Section 321 Shipping vs. Formal Entry: Which Costs Less?

The honest answer is that this is no longer a real choice for most import categories. It used to be a genuine cost-benefit decision. Now it is closer to a compliance requirement with a shrinking exception window.

When de minimis was broadly available, the parcel-first model won on almost every axis that mattered for small and mid-size e-commerce sellers: no bond required, no IOR needed, minimal documentation, and duty-free treatment on qualifying goods. Formal entry, by comparison, means broker fees on every shipment, MPF and possibly HMF, bond costs, and the administrative overhead of accurate HTS classification across your catalog.

That calculation flips once your goods are excluded from de minimis by origin, category, or aggregate volume, which describes an increasing share of consumer imports as 2026 progresses. At that point, the comparison is not “cheap parcel shipping versus expensive formal entry.” It is “formal entry done efficiently at scale versus formal entry done reactively, one held shipment at a time.” Bulk formal entry, where you consolidate shipments and amortize bond and broker costs across volume, consistently beats piecemeal parcel entries that keep getting flagged and delayed under ACE’s new aggregation checks. The businesses struggling most right now are the ones still trying to run yesterday’s parcel-first model through today’s enforcement environment.

What Should Businesses Do About Section 321 Suspension?

You have real options here, and which one fits depends heavily on your volume, margins, and how concentrated your product catalog is in tariff-exposed categories.

1. Consolidate into bulk formal entry. If you are shipping enough volume that per-unit broker and bond costs shrink meaningfully at scale, moving to scheduled bulk formal entries instead of constant individual parcel filings usually cuts your effective landed cost and, just as importantly, cuts your exposure to random ACE holds. Implementation typically takes two to four weeks once you have a broker and bond in place.
2. Use a bonded warehouse or Foreign Trade Zone (FTZ) for duty deferral. Goods held in a bonded warehouse or FTZ do not trigger duty until they formally enter U.S. commerce, which can meaningfully improve cash flow for businesses holding inventory before sale. This is a stronger fit for higher-volume operations than for occasional shippers, since the setup and ongoing compliance overhead only pays off at scale.
3. Shift sourcing away from tariff-exposed origins. If a meaningful share of your catalog is Chinese-origin and hit by Section 301 exposure, diversifying toward other manufacturing origins reduces both duty cost and the aggregation risk that keeps triggering ACE holds. This is the slowest option to execute, often six months or more, but it is also the one with the most durable upside.
4. Adjust pricing to absorb duty-in-landed-cost. Some businesses are simply building duty into their retail pricing rather than fighting the exemption’s disappearance. This protects margin predictability but requires transparent communication with customers about why prices moved.
5. Outsource to an Importer of Record instead of building compliance in-house. For businesses that do not want to become customs experts overnight, contracting with an IOR service transfers the bond, documentation, and CBP accountability to a partner already equipped to handle it. This is usually the fastest path to compliant formal entry, often operational within a couple of weeks.

The decision rule is fairly simple in practice: consolidate into bulk formal entry once your parcel volume regularly triggers ACE holds or aggregation flags, because at that point you are already paying the friction cost of formal entry without any of its efficiency. Keep parcel flows only for the narrow slice of shipments still genuinely eligible under a clean “one person, one day” claim and an unrestricted origin.

Get accurate HTS codes and origin documentation locked down there first. That is where formal entry errors cost you the most, and where getting it right fastest protects the bulk of your revenue.*

How Moreshores Handles Section 321 Compliance for You

Every requirement covered above, HTS accuracy, bonds, IOR designation, documentation, and warehousing, maps directly onto what Moreshores already does for cross-border e-commerce brands.

Some providers act as the Importer of Record, meaning the legal accountability for accurate declarations and duty payment sits with a partner rather than with the brand itself. Cross-Border & Compliance services cover customs clearance, duties, VAT handling, and regulatory compliance as one continuous process rather than a patchwork of separate vendors.

On the classification and documentation side, getting HTS codes and country of origin right the first time is exactly the work that determines whether a shipment clears smoothly or gets flagged under ACE’s aggregation logic. Accuracy in HTS codes and country of origin is important to build into the import process rather than treating it as an afterthought.

For fulfillment, Some providers run warehousing, inventory management, and order dispatch through a multi-courier network, which matters directly for the “one person, one day” ownership questions that trip up shared fulfillment setups.

Fulfilment & Warehousing services are structured around clear ownership and intake documentation from the start.

A typical onboarding sequence looks like this:

• Share your current product catalog with HTS classifications and origin documentation, or let Moreshores help build that mapping from scratch.
• Provide commercial invoice templates and existing supplier relationships for review.
• Agree on warehousing and fulfillment volume expectations to set realistic SLA timelines.
• Confirm which marketplaces and storefronts need integration, whether that is Shopify, WooCommerce, or a direct marketplace listing.

Why the Real Risk in 2026 Isn’t the Suspension Itself

Most of the coverage on Section 321’s suspension focuses on the wrong variable. Everyone is fixated on whether de minimis comes back, whether courts intervene, whether some future administration reverses the 2025 orders. That is the least useful question you can ask right now.

The more important question is whether your operation can survive the uncertainty regardless of how it resolves. Businesses that spent 2025 waiting for clarity before building formal entry infrastructure are the ones eating the worst hold rates and penalty exposure today. The ones that treated the suspension as permanent from day one, even while hedging that it might not be, are the ones filing cleanly right now.

Here is my prioritized order of operations if you are still catching up. First, run compliance triage immediately: get HTS codes and origin documentation correct on your highest-volume SKUs within the next week, not the next quarter. Second, make the operational model decision, bulk entry, bonded warehousing, IOR outsourcing, or some blend, based on your actual volume and margin structure, not on hope that the exemption returns. Third, communicate pricing changes to customers honestly and early, because duty costs that show up as a surprise at checkout do more damage to customer trust than a modest, well explained price adjustment.

Keep watching CBP’s own notices and the court challenges working through the system. Keep your documentation clean regardless of which way any of it breaks. The July 2027 repeal date is fixed in statute, but the path between now and then is going to keep shifting, and the businesses that treat every administrative change as a permanent baseline, rather than a temporary state to game around, are the ones that will still be shipping smoothly when it finally lands.

— Matt

Get Compliant Before the Next Hold Hits Your Shipment

Building bond, IOR, and HTS compliance from scratch while shipments are already stuck at the border is the hardest way to solve this problem. Moreshores gives you a single partner covering customs clearance, duties and VAT, warehousing, and fulfillment instead of assembling brokers, bonds, and warehouse contracts separately while your inventory sits on hold.

That matters most right now because the businesses getting hurt by the Section 321 suspension are not the ones with bad products. They are the ones without formal entry infrastructure ready to absorb the shift. Moreshores acts as your Importer of Record, handling customs clearance and compliance so you are not building a broker relationship and a bond from zero while cargo sits at the port. Fulfillment and warehousing run through the same platform, with a multi-courier network that keeps delivery moving once goods clear. If a catalog touches marketplaces like Takealot, Amazon SA, Jumia, or Kilimall, or runs through Shopify or WooCommerce, integrations can extend into channel distribution without a separate vendor for each piece.

Review current pricing for cross-border services and get a compliance assessment started before your next shipment cycle.

Sources

• Section 321 Programs — U.S. Customs and Border Protection
• Imports and the Section 321 (De Minimis) Exemption: Origins, Evolution, and Use — CRS
• Section 321 — ‘Does Not Exceed $800’ ACE enhancement (Trade Information Notice) — CBP (PDF)

FAQ

Is Section 321 Still in Effect?

Section 321 still exists as law, but its practical availability has narrowed sharply since 2025. CBP has suspended broad de minimis treatment for many origins and categories, and ACE now automatically enforces the $800 aggregate threshold, so a growing share of shipments that once qualified now require formal entry.

Is De Minimis Still Available in the USA?

De minimis remains legally available for a shrinking set of qualifying shipments that meet the “one person, one day” test and are not otherwise excluded by origin or tariff category. Statutory repeal for commercial shipments is scheduled for July 1, 2027, and administrative suspensions since August 2025 have already cut usable volume well before that date.

What Are the Import Regulations for Shipments Into the United States?

Any shipment that does not qualify for the de minimis exemption needs a full formal entry: a customs bond, a designated Importer of Record, a 10-digit HTS classification, verified country of origin, and payment of duty plus the Merchandise Processing Fee. Ocean shipments also require Importer Security Filing at least 24 hours before vessel loading.

How Do I Know if My Shipment Still Qualifies for Section 321?

Check whether the goods are Chinese-origin or otherwise subject to Section 301, 232, or 201 tariffs, since those categories are currently excluded regardless of value. Then confirm the shipment meets the aggregate $800 threshold under a single verified owner, since ACE Release 3 will automatically flag and withhold anything that fails that test.

Can a Service Handle Section 321 and Formal Entry Compliance for Me?

Yes. Moreshores acts as Importer of Record for brands moving away from parcel-first shipping, managing HTS classification, bonds, and customs clearance alongside warehousing and fulfillment. Current pricing for these services is listed on the Moreshores pricing page.

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