The cleanest way to separate the roles: a freight forwarder moves goods, a customs broker makes them legal to enter. The broker files the entry, declares value and origin, applies the HTS classification, pays duties on the importer's behalf, and coordinates other agency requirements (FDA, EPA, and similar) at the border. Many logistics providers sell both services, which blurs the distinction commercially but not legally: brokerage requires a license and a power of attorney from the importer.

What a broker does not do is absorb your risk. Reasonable care sits with the importer of record, so if a broker enters parts under the wrong classification for three years, the back duties and penalties land on you. Treat the broker as an executor of your instructions: maintain your own classification database, send it with every shipment profile, and audit a sample of entries each quarter instead of discovering errors at liquidation. Broker selection matters most where complexity lives, meaning multi-country sourcing, trade remedies, preference claims, and security programs like CTPAT, where the broker is one of the business partners an importer is expected to vet.