Does this work better?
=DSum("[bins finished]","bin table","[day]=DateAdd('d', 1, #" & [pay period start date] & "#) And [employee number]=1")
If there is a chance that the database will be used by someone who doesn't use US format dates (m/d/yyyy), change it to
=DSum("[bins finished]","bin table","[day]=DateAdd('d', 1, #" & Format([pay period start date], "mm\/dd\/yyyy") & "#) And [employee number]=1")
Regards, Hans Vogelaar (http://www.eileenslounge.com)