What is a non-machinable surcharge?

A non-machinable surcharge is a specific fee applied to first-class letters that cannot be processed automatically by postal sorting machines. This situation arises when a mail piece does not meet the standard size, weight, or shape criteria required for machine processing. The surcharge is implemented to cover the additional handling costs that the Postal Service incurs when these items must be processed manually rather than through automated systems.

This concept is crucial for both senders and postal employees to understand, as it helps to ensure that mail is prepared correctly to avoid unexpected additional charges. Therefore, knowing how to identify mail that qualifies for the non-machinable surcharge can aid in effective mailing practices and cost management.