Network days error

I have a date field. When I enter a date I have another date field which takes the original date field and adds 10 workdays ie response due date. I have another field which counts the number of days (net workdays) until the response due date. I use networkdays and today functions. It appears ok but when the response due date equals today the counter shows a value of 1 but one day later the value of -2. I would be grateful for any assistance.

Apologies, this is something I am doing at work, I was trying to explain in a simple manner (obviously not done too well). I will post again with formula. It is to do with inclusive days I think. If you add -1 to the formula it is fine for positive values but negative it doesn't work.

Cell A3 – manually enter date
Cell J3 - =IF(ISBLANK(A3),"",WORKDAY(A3,10))
Cell K3 - =IF(L3>0,"",IF(O3>0,"COMPLETE",IF(ISBLANK(A3),"",(NETWORKDAYS(TODAY()+1,J3)))))
If one day left counter shows value of 1
In due today counter shows -1 (how do I make this value 0)
If due yesterday counter shows -1

L3 is a holding response date and L3 is a date when final response is sent. L3 may never have a value.

Sorry, I can't seem to add a sample but field A3 is the date created, J3 is 10 workdays from that date and cell K3 is a counter that drops a day each day. But when it reaches date due ie today i would like it K3 to show 0 and on Monday to show -1.

I may not get to check until Monday. Thank you for spending time to help.