Javascript Property Tax Calculator Embedded onto a Wordpress Site

General information for the website: WordPress Website
Num. of web pages/modules: 1
Description of every page/module: Javascript Property Tax Calculator to be embedded into clients wordpress website, To be able to control/change the calculations from admin area of wordpress.
Description of requirements/features: The plan was to make a nicer looking version of http://www.propyield.com/#calculator. make it a similar layout but branded up with clients colours.

If it could fit into a WordPress site that would be awesome.

Calculations message from Accountant:

Attached is the model which is based upon the model in Propyield but the stamp duty calculator in that model is incorrect. Hence, the calculator in KnightFrank is used (http://www.knightfrank.co.uk/stamp-duty-calculator)

Propyield
The variables are constants for all values from zero to infinity

Agency - 1.0%
Legal – 0.75%
Other – 0.57%

These are show in columns “I-L” on the attached spreadsheet

Stamp Duty
Cross checking of Knight Frank is shown on columns “S-Y” on the attached spreadsheet.

There needs also to be a ‘trigger’ in the model for the property being (i) residential buy to let (ii) commercial (Y/N)

Where it is a Residential BTL the model needs to add 3% to the rate on all stamp duty levels.

The table is shown in Frank Knight.

The attached replicates this
The rates are shown in cells “S5:W5”
The thresholds are show in cells “S6:W6”

The rates are not ‘cumulative’ – eg it only applies to that threshold area – if you go over £125,000 the rate only applies to the excess above £125,000 and not on the whole amount

If you have any questions on the formulae let me know!
Extra notes: