One thing that took me a long long time to realise was that XamlReader.Load will convert floating point values in XAML to double, and since I had used float/single throughout my app, I kept getting AG_E_PARSER_BAD_PROPERTY_VALUE.

So, lesson learned the hard way, but, anyway, check it out!
http://www.huydinh.co.uk/demo/incomecalculator/

Join the conversation with google wave:

This is now updated to calculate this year’s deductions and compare it with last year’s.

The “Hourly” button shows your actual hourly rate taking into account the number of hours you work a day and the number of days holiday (and public holidays) a year.

If you work less than 5 days a week, you can still get accurate results by adding the number of days off onto your holiday (e.g. if you work 4 days a week, that means you have 52 days extra holiday a year, add that to your holiday allowance). If you work more than 5 days a week, subtract those extra days from your holiday!