Bonded warehouses and FTZs

Last updated October 21, 2026

Import duty is normally due when goods enter a country. A bonded warehouse or free trade zone moves that point. Imported goods sit in a supervised facility with duty and import taxes suspended, and then they’re either released into the market, and pay, or leave the country again and pay nothing. That suits slow-moving stock, goods whose final destination isn’t settled on arrival, and high-duty products. It also brings extra cost, paperwork and audit exposure. The rules are detailed and change often, so confirm any plan with a licensed customs broker before relying on it.

How bonded storage works

A customs bonded warehouse is a building or area approved by the customs authority to hold imported goods before duty is paid. The operator posts a bond or guarantee covering the duty on goods in its care and keeps inventory records customs can audit. Goods inside have arrived in the country, but the duty on them isn’t payable yet.

Warehoused goods leave in one of three ways. They can be released for consumption, meaning withdrawn into the domestic market, with duty and import taxes paid at that point. They can be exported or re-exported, leaving without paying the duty they would have owed on import. Or they can be transferred to another bonded facility or another customs procedure.

Bonded is a customs status, not a building type. A bonded area might be a section of an ordinary public warehouse, a tank farm or part of a grain elevator. The physical side is covered under storage types.

US bonded warehouses

US customs warehouses are governed by 19 CFR Parts 19 and 144. The regulations set out eleven numbered classes, with Class 10 reserved:

Most commercial users only deal with Class 3 (public), Class 2 (private) or Class 8 (manipulation).

Goods go into a bonded warehouse on a warehouse entry, filed as Entry Type 21. CBP requires these entries to carry the FIRMS code of the receiving warehouse, and container freight stations and express consignment facilities can’t accept them. Some products are barred outright: perishable merchandise and explosives (other than firecrackers) may not be entered for warehousing. Goods can stay up to five years from the date of importation, and longer only if CBP approves a request showing good cause.

To bring goods into the domestic market, the importer files a withdrawal for consumption on CBP Form 7501 or its electronic equivalent and deposits estimated duties at that time. CBP identifies these withdrawals as Entry Types 31, 32, 34 and 38, depending on quota and antidumping status. Watch the rate date here. Warehoused goods are dutiable at the rates in effect when they are withdrawn, not when they arrived, so if rates go up while goods sit in bond, you pay the higher rate. Goods withdrawn for export pay no duty.

US foreign-trade zones

Foreign-trade zones are a separate program, created by the Foreign-Trade Zones Act of 1934. The FTZ Board, chaired by the Department of Commerce with Treasury, approves zone sites and production activity under 15 CFR Part 400. CBP supervises day-to-day operations under 19 CFR Part 146. A site has to be designated by the Board and then activated by CBP before it can receive goods in zone status.

The International Trade Administration’s briefing for CBP sets out how zones differ from bonded warehouses. There’s no time limit on goods, domestic and foreign goods can be held together, and a wide range of production activity can be authorized. Goods in a zone may be stored, tested, relabeled, repackaged, assembled or manufactured. Production that changes tariff classification needs advance Board approval, though, and retail trade is prohibited.

The savings usually cited start with duty exemption on goods re-exported from the zone and duty deferral until goods are entered for consumption. Then there’s inverted tariff relief, where an approved production activity yields a finished product with a lower duty rate than its imported components. Some operators can also use weekly entry, which consolidates customs filings.

Zone status changes the math. Goods admitted in privileged foreign status are classified at the rate in force when that status was requested. The rate is locked, but any inverted-tariff saving is gone. Merchandise subject to antidumping or countervailing duty orders must be admitted in privileged foreign status, and Section 232 tariff measures have imposed the same requirement on covered goods, so check the current rules for your products.

EU and UK customs warehousing

In the EU, customs warehousing is one of the special procedures under the Union Customs Code (Regulation (EU) No 952/2013). Non-EU goods placed in an authorized warehouse are not subject to import duty or other charges while stored, and they can stay for an unlimited period unless they pose a risk to health or the environment.

Irish Revenue’s guidance manual summarizes the three categories in the current code. A public customs warehouse type I is open to anyone, with responsibility shared between the authorization holder and the holder of the procedure. Type II is also open to anyone, but responsibility rests on the holder of the procedure. A private customs warehouse is reserved for the authorized operator, who doesn’t have to own the goods.

Applicants must show an economic need and provide a guarantee, which can be waived for Authorised Economic Operators. Only “usual forms of handling” are allowed inside, such as sorting, repacking, relabeling, sampling and simple repairs. Anything more substantial means moving the goods to inward processing. The Irish guidance also notes that excise goods need a separate excise warehouse authorization or prior payment of excise. Member states can designate free zones as well, enclosed areas where non-EU goods are held without import duty.

Since leaving the EU, the UK has run its own regime, administered by HMRC. Imported goods can be stored with duty and import VAT suspended until they’re released for free circulation. Goods that are re-exported or moved to another customs procedure (other than authorized use) pay neither. Once authorized, goods can be kept for an unlimited time, though HMRC can order their removal if they threaten health or the environment.

A UK warehousekeeper must be authorized, established in the UK, hold an EORI number, be solvent, have a good compliance record and show a business need. A guarantee is required unless the operator holds or meets the conditions for Authorised Economic Operator status. Applications for public warehouses have to include letters of intent from prospective users.

Comparing the options

EU and UK customs warehousing sits close to the bonded warehouse column, minus the five-year limit.

When it pays and when it doesn’t

Bonded storage tends to earn its keep when a meaningful share of the stock gets re-exported, since duty never paid beats duty reclaimed later. It helps when duty is high relative to value, so that deferral frees real working capital. It also fits when the final market isn’t known at arrival, as with regional hubs serving several countries, and when goods sit for months, as spirits, wine and spare parts often do. In an FTZ, production that yields an inverted tariff is another good case.

Fast-turning stock is the usual counterexample. Deferring duty for a few weeks rarely covers the higher handling rates and compliance work. Low or zero duty rates leave little to defer. In a US bonded warehouse, rates that look likely to rise work against you, because duty follows the withdrawal date.

Weak records are a problem anywhere. Customs warehousing depends on accurate inventory by lot, status and declaration, and a poor count turns into a duty bill; the guide to warehouse KPIs covers inventory accuracy measures. Perishables are out in the US, where bonded warehouses can’t accept perishable merchandise at all. The handling side of food storage is in cold storage temperatures.

If a bonded option is part of an overseas setup, settle the importer-of-record and brokerage questions first. Using a 3PL in another country goes through them, and the glossary defines the customs terms used here.

If something here is wrong or out of date, please let us know.