This paper investigates the relation between import decisions and productivity performance for Dutch firms. Importer productivity premiums appear to be larger than those for exporting firms. In the perspective of recent trade theory this indicates that trade costs for importers are at least as important as they are for exporting firms. For import starters I find evidence that ex ante productivity-based self selection is important. This also points in the direction of considerable sunk trade costs for firms that engage in direct imports.