CBP Form 3461 Customs Release

当CBP不要求提供货运文件作检查时，报关行可以以电子数据的方式提交3461 Customs Release。 这个表格的目的是加快货物的清关速度。 在表格提交后， CBP将决定货物是否查验或放行。 在放行后的10内，报关行需要发送CBP Form 7501 Entry Summary到CBP。

3461 – Customs Release – The document we initially submit electronically to Customs, unless they request hard copies of shipping documents to review the shipment. This form is intended to speed up the release of your goods. Customs signs off on your shipment, either releasing it or designating it for exam. After release, we have ten days to file the detailed and comprehensive Customs Entry (7501).

CBP form 3461 官方文档： https://www.cbp.gov/document/forms/form-3461-entryimmediate-delivery-ace

CBP Form 7501 – Customs Entry Summary

这个表格用于提供更详细的信息给CBP， 货物的税费将基于此申报进行计算。
This is the form used to calculate duties and provide detailed information to CBP. Your payment must follow with the form. We submit both forms and funds for your duty electronically, unless you’re set up for ACH payments directly with Customs, which is preferable.

CBP form 7501 官方文档： https://www.cbp.gov/trade/programs-administration/entry-summary/cbp-form-7501/

总的来说， CBP Form 3461 Customs Release相当于预清关，用于申报概述信息；CBP Form 7501 Customs Entry Summary, 当相于报税单， 申报完整的信息并报税。 

在清关时， 报关行可以选择这两步申报，即先用3461做预清关，然后申报7501报税；也可以做一步申报，直接提前申报7501，直接在到港前就申报完整的信息给CBP，做清关和报税，在这种情况下，就不需要申报3461。