Incometax.md
March 19, 2018 ยท View on GitHub
#Kata: Income Tax Calculator
Introduction
The United States Income Tax is a Progressive Tax, broken into brackets by the amount of yearly household income.
Rules
The 2013 tax owed for a person filing as Single is:
| Amount Earned | Percentage Owed |
|---|---|
| under $8295 | 10% |
| under $36,250 | 15% |
| under $87,850 | 25% |
| under $87850 | 28% |
| under $183,250 | 30% |
| under $398,350 | 33% |
| under $400,000 | 35% |
| over $400,001 | 39.6% |
The tax is progressive, in that only the portion of income that falls into a certain bracket is only taxed at that bracket's rate.
For example, a person making $10,000 per year would be taxed at 10% for every dollar in the lowest bracket ($829.50), the remaining $1,705 taxed at 15% ($255.75), for a total tax of $1,085.25.
Tax is only owed in whole dollar amounts. The final result should round to the nearest whole dollar. (Round down for 0.01-0.49, and up 0.50 to 0.99).
Test Cases
No_Income_Returns_0()Negative_Income_Returns_0()Income_Of_10000_Returns_1085()Income_Of_20000_Returns_2585()Income_Of_450000_Returns_123149()