Question : Goal Seek and Tax rates & Excel Formula

Hi,  This week has been tough.  Here is another formula that has me stumped and I am looking for help.  I have a tax rate applied to labor used to determine the amount of taxes.  The labor amount is not known and can only be determined by "backing" into it. A tax rate change occurred, doubling, , and there are more planned changes (could be decreases or increases) for the future, but the formula "broke", causing the "backed" into labor amount to be cut in half.  Can anyone figure out how to change the formula to account for any posisble tax rate changes, up or down?

Test-2010-08-19.xls (39 KB) (File Type Details) 

tax rate change formula

..OS is XP and Excel 2003..soon to be upgraded to Windows 7 and Excel 2007

Related Solutions: Goal Seek and Tax rates & Excel Formula: PART 2

Answer : Goal Seek and Tax rates & Excel Formula

See the attached spreadsheet.

You need extra columns, which you can hide later. This is because you used the original tax rate and amount to backsolve for a labor column you didn't have, so you can't change those original values.

I did a Copy/Paste Special...Values to get a new Labor column (as static value) that won't change when you adjust the tax rate.

I hope these point you in the right direction.

Labor-and-Taxes-with-Additional-.xls (44 KB)  (File Type Details) 

Bold columns were added. Colums with red flag are original inputs that can be hidden.