Overrun First on BOB

[SanDiegoSteve]

Official MLB interpretation, and the one I use:

NOTE: The batter-runner is not prohibited from overrunning first base on a base on balls (i.e., the batter-runner may overrun first base on a base on balls and is not in jeopardy of being put out provided he returns immediately to first base). (See Official Baseball Rules 7.08(c)(EXCEPTION), 7.08(j), and 7.10(c).)