It seems so close but its still not working.

The AL14-37 is where the "total" points for that month will be kept so I
wanted to included a rolling 12month total so Jan 2014 it will calculate
a total from Feb 2013-Jan2014.

If I understand the requirement, the formula
=SUM(OFFSET(AL14,MAX(0,COUNT(AL14:AL37)-12),0,12,1))
seems to work.

For example, with AL14:A26 containing 1,2,3,...,13, and the rest of the column empty, the formula returns 90, which equals SUM(AL15:AL26).

If that's wrong, what should the result be in this case?

Am I off by one someplace?