I need a calculator developed; Excel spreadsheet attached.
Basically user enters income data and it calculates tax.
I have a class created [url removed, login to view] that has the tax rates for each year. the formulas are the same ie. TotalTax2013(income) as the excel file.
It needs to be added into a wordpress page but I need to make sure that it doesn't slow the whole site down- code only should be loaded for this page.