# Trouble with an Otherwise Zero formula

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I'm working on a time sheet where employees work a max of 80 hours in a two week period.  Once they reach 80 hours, then OT kicks in.  So, I'm trying to do the calculation for the OT...and created this formula =IF((N28-80)<80,SUM(N28-80),0) - which works great if they have 80 or more hours, but if less than 80, I'm getting a negative value in the field.  What did I do wrong?

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Try formula        =IF(N2<=80,0,N2-80) in Row2.  You need to break it down in sections, like if the cell in question is LessThan or Equal to 80, then there is 0 hours OT, ELSE compute the difference between hours worked and 80 hours to get the # of OT hours worked.

When in doubt, simplify things (take one component at a time!

~ Bueno suerte!

### Discussion

Thank you...I kept working on it and just now found a calculation that also works...and was about to post it, when I saw your reply.  I appreciate your help.  This is what I did:
=SUM(N28-80)*IF((N28-80)<80,(N28>80),0)
Yours is simpler, so I might try it and see if it works.
Thanks!
SchauerArts Nov 10, '16 at 3:38 pm
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I did find a formula that works,

=SUM(N28-80)*IF((N28-80)<80,(N28>80),0)