IF Function - Calculation not working

[Guest]

I have sum:

=IF(C7>=10000,SUM(6000*10%)+(4000*15%)+((C7-10000)*20%),IF(C7<=10000,IF(B7>6000,SUM(6000*10%)+((C7-6000)*15%),IF(C7<=6000,SUM((C7-2000)*10%),IF(C7<=2000,0)))))

And this works, however when I change one of the input figures, then the
total comes our wrong.
my calculation is based on 10% from $2m - $6m, 15% from $6m-$10m and 20%
$10m and above.

Have I got my sum wrong?

 

[Tim C]

One way:

=MAX(C7-2000,0)*10%+MAX(C7-6000,0)*5%+MAX(C7-10000,0)*5%

Tim C

 

[Guest]

Thank you - I have looked further into my problem, and my sum is correct for
what I am trying to achieve, however I have found the last IF sum won't work:

=IF(C7>=10000,SUM(6000*10%)+(4000*15%)+((C7-10000)*20%),IF(C7<=10000,IF(B7>6000,SUM(6000*10%)+((C7-6000)*15%),IF(C7<=6000,SUM((C7-2000)*10%),IF(C7<=2000,0)))))

IF the C7 column is less then 2000 then it should equal 0 - however this
doen't work - my figure keeps coming up as a negative?! What have I done
wrong?

 

[Guest]

I noticed in the formula that your conditions are as ff:

a. if C7 >=10000
b. if C7 <=10000
c. if C7 <=6000
d. if C7 <=2000

Try removing the "=" sign on either condition a or b, since if the value of
C7 = 10000, conditions a & b are TRUE, and this could be the error since
Excel will follow the first condition. Same also applies when the value of C7
= 2000 orless, conditions b, c, & d are all TRUE, hence Excel will follow
condition b.

Also, try to use the AND function to specifiy the range of value you use on
your conditions, ie:

=IF(AND(C7<=10000,C7>=6000),CONDITION1,CONDITION2)

Hope this helped.

 

[Guest]

There are redundancies in your formula which I have removed plus I have
converted SUM(6000*10%)+(4000*15%) to its result of 1200 and SUM(6000*10%) to
600 because these are constants. BTW, the Sum function used here serves no
purpose. I have also assumed that the reference to B7 was intended to be C7.

Your problem resides in this snippet:
IF(C7<=6000,SUM((C7-2000)*10%),IF(C7<=2000,0))

Why would the condition C7<=2000 execute if it is child to the condition
C7<=6000 which encompasses the condition that C7<=2000 ?

Following is my suggested revision:

If(C7>=10000, 1200 + (C7-10000) * 0.2, If(C7>6000, 600 + (C7-6000) * 0.15,
If(C7> 2000, (C7-2000) * 0.1, 0)))

Regards,
Greg