F16:
What sort of error do you think you'll get from a SUMIFS? Unless you have error values in the data being checked or summed, it will either return a value or zero.
For testing purposes, I set all the entries in column B in the Spend sheet to 611. All the months returned values. So, I am content that the formula is OK ... although note that I have changed some of the references to partially absolute (but it shouldn't make a difference).
I can't see how you will EVER execute the IFERROR part of the formula.
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