Wrayden thank you. That helped immensely.
All I was able to come up with (at least so far) is this array entered monster.
In case you aren’t familiar with array-entered formulas array enter means the formula must be committed from edit mode by simultaneously pressing and holding down Ctrl and Shift while hitting Enter.
In H4 and filled down. I put some "fake" numbers into July to test. It works.
Array formulas are resource hungry. The size of your workbook suggests other calculations will be in play. Please let us know if performance becomes an issue.
PS I noticed a rather large number of OFFSET formulas in 'CORE ANNUAL RAW DATA'. Normally OFFSET isn't a problem, but when there are that many they too can slow a workbook down. If you are not aware of it OFFSET is a volatile function. They and all their dependents recalculate at the slightest non related edit of data. There are alternatives if that gets to be an issue.
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