Bonded warehouses and foreign-trade zones are the two tools US importers use to control when, and sometimes whether, they pay import duty. A customs bonded warehouse lets you hold imported goods for up to five years and pay duty only when you withdraw them for sale. A foreign-trade zone goes further, letting you defer duty, cut it through inverted-tariff relief, or avoid it entirely on anything you re-export. With Section 301 tariffs on many China-origin goods still running from 7.5% to 25%, the timing of that duty payment has become a real cash-flow decision, not a footnote.
Why Tariff Timing Became a Cash-Flow Problem
Duty is due the moment your goods enter US commerce, and current rates make that a large, early cash outflow. The Section 301 action on Chinese imports, finalized by the US Trade Representative in its September 2024 four-year review, kept Lists 1 through 4A at 7.5% to 25% and raised several categories sharply: electric vehicles went from 25% to 100%, semiconductors from 25% to 50% effective January 1, 2025, and EV lithium-ion batteries from 7.5% to 25% (USTR, 2024).
When a container of dutiable goods lands, paying that bill on day one, before you have sold a single unit, ties up working capital you could use elsewhere. Bonded warehouses and foreign-trade zones both attack that problem, in different ways.
What a Customs Bonded Warehouse Does
A customs bonded warehouse is a facility authorized by CBP where you store imported goods under bond without paying duty at arrival. The goods are entered but not released into US commerce, so duty is deferred and becomes payable only when you withdraw the merchandise for consumption (19 CFR Part 144). Bonded warehouses are authorized under 19 U.S.C. 1555 and regulated under 19 CFR Part 19.
Goods can stay in a bonded warehouse for up to five years from the date of importation (19 CFR 144.5). Within that window you have three exits: withdraw for consumption and pay the duty, withdraw for export and pay no US consumption duty, or destroy the goods under CBP supervision. That re-export exit is the core tariff play. If the goods never enter US commerce, the US duty never comes due.
The Three Types You Will Encounter
Private bonded warehouses are operated by a single company for its own goods. Public bonded warehouses are shared by multiple importers, which is what most Platton clients use. Specialized facilities handle temperature-sensitive or high-value cargo that needs controlled conditions. The bond and the CBP supervision are the same across all three; the difference is who operates the space and what it is built to hold.
How a Foreign-Trade Zone Goes Further
A foreign-trade zone (FTZ) is a secure area treated as outside US customs territory for duty purposes, even though it sits on US soil. FTZs run under the Foreign-Trade Zones Act of 1934 (19 U.S.C. 81a to 81u), with the FTZ Board setting policy under 15 CFR Part 400 and CBP administering the zones under 19 CFR Part 146 (US FTZ Board).
A zone gives you everything a bonded warehouse does on deferral, plus three advantages a warehouse cannot match:
- Duty elimination on re-exports: merchandise shipped from the zone to another country carries no US duty and no quota charge.
- Duty elimination on scrap and waste: foreign-status material that becomes scrap in the zone is not dutiable.
- Inverted-tariff relief: when the finished product carries a lower duty rate than its imported components, FTZ Board approval can let you pay the lower finished-goods rate instead of the higher component rates (US FTZ Board).
On top of that, manufacturing, assembly, and repackaging are all permitted inside a zone, and unlike a bonded warehouse there is no five-year clock.
The Weekly Entry That Cuts Your MPF
Beyond duty, zones change what you pay in Merchandise Processing Fee. MPF runs at 0.3464% of entered value, with a per-entry minimum of $33.58 and a maximum of $651.50 for fiscal year 2026, effective October 1, 2025 (CBP). Outside a zone, a high-volume importer hits that $651.50 cap on entry after entry.
Inside an FTZ, the weekly entry procedure lets an operator file one consumption entry per seven-day period covering every removal in that week (19 CFR 146.63). Because that counts as a single entry, the MPF maximum applies once per week rather than once per shipment. For an importer clearing many entries a week, capping MPF at the weekly level instead of the shipment level is a recurring saving that compounds across the year.
Bonded Warehouse or Foreign-Trade Zone: How They Compare
Both defer duty and both waive US duty on re-exports. The bonded warehouse is simpler to enter and fits importers whose main need is to hold goods and time the duty payment, with a five-year ceiling. The zone does more, at a heavier setup. Side by side:
- Duty deferral: both.
- US duty waived on re-exports: both.
- Inverted-tariff relief: zone only.
- Duty-free scrap and waste: zone only.
- In-zone manufacturing and assembly: zone only.
- Weekly-entry MPF cap: zone only.
- Storage time limit: five years for a bonded warehouse, none for a zone.
Choose a Bonded Warehouse When
You mainly need to defer duty and stage inventory, you re-export a meaningful share of what you import, or you want a low-setup option without a manufacturing case. Storage under five years and straightforward withdrawals are the pattern here.
Choose a Foreign-Trade Zone When
You assemble or transform goods in the US, your finished product sits at a lower duty rate than its parts, you clear high entry volumes and want the weekly-entry MPF cap, or you need indefinite storage. The setup is heavier, and the duty savings are larger.
A Worked Example: An Electronics Importer Using an FTZ
The following is a hypothetical illustration, not a Platton client result. A US electronics distributor imports smartphone components from Asia, where individual components carry duty of up to 25%. The company operates inside an FTZ near Long Beach and assembles the components into finished phones in the zone, where the finished good falls under a lower duty rate.
In this scenario, inverted-tariff relief reduces the blended duty rate by roughly 18% versus paying component rates, duty is deferred until phones leave the zone for US sale, and any surplus re-exported to Latin America carries no US duty at all. The numbers are illustrative and depend on the specific tariff classifications and FTZ Board approval, but the mechanics are exactly how zones deliver savings.
How US Importers Use Zones Today
Close to $950 billion of merchandise moved through US foreign-trade zones in 2023, with production operations making up the larger share of activity, across 197 active zone programs, according to the Foreign-Trade Zones Board's 85th Annual Report to Congress (US FTZ Board, 2024). That is up sharply from roughly $625 billion in 2020, a jump driven in part by importers looking for tariff relief as Section 301 rates took hold.
Frequently Asked Questions
Do I Pay Duty on Goods Sitting in a Bonded Warehouse?
No. Duty is deferred while the goods are in the warehouse and becomes payable only when you withdraw them for consumption into US commerce. If you withdraw them for export instead, no US consumption duty is due (19 CFR Part 144).
How Long Can Goods Stay in a US Bonded Warehouse?
Up to five years from the date of importation, under 19 CFR 144.5. A foreign-trade zone has no equivalent time limit, which is one reason importers with long or unpredictable inventory cycles choose a zone instead.
What Is Inverted-Tariff Relief?
It is the FTZ benefit that applies when a finished product carries a lower duty rate than its imported components. With FTZ Board approval, you can pay the lower finished-goods rate on the goods leaving the zone rather than the higher rates on the parts you brought in.
Can Bonded Warehouses and FTZs Reduce Section 301 Tariffs?
They change the timing and, for zones, sometimes the rate, but they do not repeal the tariff. Deferral holds the payment until the goods enter US commerce, and re-export avoids US duty entirely. A customs compliance review is the right place to confirm how Section 301 applies to your specific classifications.
Which Tool Fits Your Supply Chain
If your goal is to time duty payments and re-export part of your volume, a bonded warehouse is the cleaner start. If you manufacture in the US, benefit from inverted tariffs, or clear high entry volumes, a foreign-trade zone returns more. Platton coordinates the storage, the customs clearance, and the duty planning together, so the tariff strategy and the physical movement of your freight are handled by one team. Talk to Platton before your next shipment leaves origin, while there is still time to route it through the right structure.
Get a Quote
