NCTS is a customs electronic transit system. Goods can be transported undeclared in the Union customs transit system, when they are imported into the European Union or are transported via the Union and Efta.

The movement of goods under these transit procedures are monitored electronically and more efficiently than before with the NCTS. In the NCTS, the customer submits a transit declaration to Customs either electronically by using an EDI message or under the fallback procedure with a paper SAD form.