Assuming your variable that changes each month is in cell B1, and assuming
the budgets from month to month are variable named such as Month1, you could
use:

=SUM(INDIRECT("Month1"):INDIRECT("Month"&B1))

Hope that helps.
--
John C


"Man" wrote:

I need to sum budget from month 1 to month "N", where "N" is a variable that
changes each month, but I don't want to change the sum formula, only the
variable that represents the month.