somestrhere / taxdeductor

Program to calculate tax and NI contributions for self employed workers in the UK.

About

The motivation behind taxDeductor was to provide a programming exercise; where I could develop my programming skills and get familiar with source control using Git Hub. The 1x version of the program was produced, with a view to developing a GUI version of the program using Windows Forms or WPF in C# at a later stage.

taxDeductor is setup with constants, which have been hard coded from information on tax and National Insurance (NI) rate information, taken from:

https://www.gov.uk/income-tax-rates/current-rates-and-allowances and

https://www.gov.uk/self-employed-national-insurance-rates

taxDeductor is designed for self employed workers within the UK, and will use the above information and user imputed values to calculate how much tax and NI contributions the user can expect to pay for the year.

Version 1.1.3 - 30th June 2017.

Important information

This program currently calculates a users National Insurance (NI) contributions due for the year based on Class 2 and Class 4 contributions; however, please bear in mind that; "The [UK] government has announced Class 2 NICs will be abolished from April 2018." (https://www.moneyadviceservice.org.uk/en/articles/tax-and-national-insurance-when-youre-self-employed)

License

Licensed under the MIT License.

taxdeductor's Issues

Bug; output produced before receiving correct input from user

Similar to issue #2 there is a bug which is causing the program to produce the output before receiving the correct input from the user.

Bug found by;

1. Pressing enter at first prompt
2. Pressing y to enter a value for the whole year
3. The program than skips to asking the user if they wish to declare any tax write off, rather than allowing the user to input their gross income for the year as expected.
4. ... thus the program produces an incorrect output, because no income as been entered.

Can you please review this error and #2 for me @raby

Bug in error handling for initial user input

Found a bug, in what is probably the error handling for the initial user input.

Created in testing as follows:

User enters 'y' at the first prompt and then inputs 650 as a tax write-off. At the second prompt asking whether the user wants to enter monthly income values or a yearly value the user enters a number, instead of the expected 'y' or 'm' value. Error handling picked this up and asked the user again to enter 'y' or 'm'.

Upon entering 'y', the program displayed the "solutions" and print statements rather than asking the user to enter a gross income figure for the year.

preTaxMonthlyArrayTotal only returns a value of 66

Regardless of user input into preTaxMonthlyIncome[] the sum of that array is only returning 66...