Andy

You posted your question in the "forms" newsgroup, but ask about your
"table".

If this were mine, I'd create a query to count (i.e., add) the checkboxes
where Month([DateOfEntry]) = 1.

If you have to count checkboxes = True, try using DSUM() instead.  Take a
look in Access HELP for the exact syntax ... you should be able to use that
Month() function inside DSUM().

Note:  you may also need to use the Abs() function to get the absolute value
of the "sum" of the checkboxes -- Access stores a "True" as -1.