This is certainly a new one for me -- I have a simple worksheet - first two columns are monthly charges - the third column I have a formula to add the first two columns and multiply by the tax rate for the county in question. The fourth column adds the three amounts across. At the bottom of the spreadsheet I am adding the amounts in each column, but three of the columns have incorrect amounts! I have check the format - they are all currency. I have tried manually typing =sum etc - no matter how I try it the amounts in those three columns are wrong. What else can I check? Thanks!