September 2012

Only players on an MLB Reserve List (40-man roster) can be placed on an MLB Active List (25-man roster).

A free-agent with prior MLB and/or minor league service who signs a Major League contract must be added to his club's MLB Reserve List (40-man roster) when he is added to an MLB Active List or when the contract is filed with the MLB Commissioner (whichever comes first). Contracts must be filed with the MLB Commissioner within 20 days of signing.

Each MLB club is permitted to reserve no more than 40 players on its MLB Reserve List, which is why the MLB Reserve List is also called the "40-man roster."

Each MLB club is permitted to roster a maximum of 25 players on its MLB Active List (also known as the "25-man roster") Opening Day through August 31st, and the limit is increased to a maximum of 40 players September 1st through the last game of the MLB regular season. The Active List maximum limit then reverts back to 25 players again for post-season play (LDS, LCS, and World Series).

Information on the MLB Reserve List aka 40-man roster.

Everything you ever needed to know about the complexities of major league and minor league roster rules thanks to the hard work of Arizona Phil.

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