"Don Kline" wrote:
If I run it from one source Goal Seek returns 3.1362%. If I flip to
the "other" source, Goal Seek returns 3.2072%

Well, I don't see how you get either of those numbers or even close. I get
about -1.6401%, if I understand your problem correctly. I get that with
IRR, as well as with Goal Seek and Solver. IRR requires a hint :(.

I believe you are saying that you invest the positive amounts for 19 years,
then you withdraw the negative amounts for 6 years, and you expect a balance
of zero. All transactions are at the beginning of the year.

As for the different results depending the source, well, I guess I don't
know what you mean by "source". Exactly where are you importing the values
from, and how?

My first impression was a rounding problem; format the cells to 4 decimal
places. But in my experiments with the numbers provided, that did not
change the result significantly -- still -1.6401% to 4 dp.


----- original message -----

"Don Kline" wrote in message
...
I am using Goal Seek to determine an interest rate for an investment stream
that returns a zero. The investment is irrgular in amount but the period
is
annual for each transaction.

My problem is I am getting different answers depending on the source of
the
numbers.

BUT the imported investment stream is the same regardless of the source.
If
I run it from one source Goal Seek returns 3.1362%. If I flip to the
"other"
source, Goal Seek returns 3.2072%

I am stymied as to why there are different results depending on identical
sources.

Below is the investment stream

8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
8,616.77
3,269.89
2,062.33
940.42
-165.44
-18,279.87
-20,304.66
-22,524.53
-25,033.38
-27,804.93