Well - first let's fix the formula. This assumes your sheets '01' through
'07' are ALL side by side

Rewrite

('01'!C3+'02'!C3+'03'!C3+'04'!C3+'05'!C3+'06'!C3+' 07'!C3-1)

as

=SUM('01:07'!C3)-1

Now, to ensure it never goes negative, use

=MAX(SUM('01:07'!C3)-1,0)

"MWRhino" wrote:

Every tenant gets one free go per week. I need to create a formula where
where any negative numbers are returned as a '0' result.
('01'!C3+'02'!C3+'03'!C3+'04'!C3+'05'!C3+'06'!C3+' 07'!C3-1) Returns a -1
result. I need it to return '0' answer.