Can anyone suggest a formula, array or otherwise, which will achieve
the following.

I have 24 columns of data, two for each future month. As we progress
through a financial year I want to be able to add up the remaining
months of the year.
i.e. In Month 1, I need to include 22 columns; in month 2, 20 columns;
month 3, 18 columns etc..

I already have a variable set which represents the current month so
would like this to be included in the formula.

I could code this with a VBA routine, but feel there must be a
relatively straightforward formula which would achieve this, and as an
added benefit would be more readable by a user of the workbook.

TIA

Richard Buttrey