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# 11.12 (Financial application: compute tax) Rewrite Listing 4.7, ComputeTax.py, using
# lists. For each filing status, there are six tax rates. Each rate is applied to a certain
# amount of taxable income. For example, from taxable income of $ 400,000 for a single filer, $ 8,350 is taxed at 10% (33,950 – 8,350) at 15%, (82,250 – 33,950)
# at 25%, (171,550 – 82,250) at 28%, (372,950 – 171,550) at 33%, and (400,000 –
# 372,950) at 35%. The six rates are the same for all filing statuses, which can be
# represented in the following list:
# rates = [0.10, 0.15, 0.25, 0.28, 0.33, 0.35]
# The brackets for each rate for all the filing statuses can be represented in a twodimensional
# list as follows:
# brackets = [
# [8350, 33950, 82250, 171550, 372950], # Single filer
# [16700, 67900, 137050, 208850, 372950], # Married jointly
# [8350, 33950, 68525, 104425, 186475], # Married separately
# [11950, 45500, 117450, 190200, 372950] # Head of household
# ]
# Suppose the taxable income is $400,000 for single filers. The tax can be computed
# as follows:
# tax = brackets[0][0] * rates[0] +
# (brackets[0][1] – brackets[0][0]) * rates[1] +
# (brackets[0][2] – brackets[0][1]) * rates[2] +
# (brackets[0][3] – brackets[0][2]) * rates[3] +
# (brackets[0][4] – brackets[0][3]) * rates[4] +
# (400000 – brackets[0][4]) * rates[5]
def main():
status = eval(input("(0-single filer, 1-married jointly,\n" +
"2-married separately, 3-head of household)\n" +
"Enter the filing status: "))
# Prompt the user to enter taxable income
income = eval(input("Enter the taxable income: "))
# Compute and display the result
print("Tax is", format(computeTax(status, income), "7.2f"))
def computeTax(status, income):
rates = [0.10, 0.15, 0.25, 0.28, 0.33, 0.35]
brackets = [
[8350, 33950, 82250, 171550, 372950], # Single filer
[16700, 67900, 137050, 20885, 372950], # Married jointly
[8350, 33950, 68525, 104425, 186475], # Married separately
[11950, 45500, 117450, 190200, 372950] # Head of household
]
tax = 0 # Tax to be computed
# Compute tax in the first bracket
if income <= brackets[status][0]:
return income * rates[0] # Done
else:
tax = brackets[status][0] * rates[0]
# Compute tax in the 2nd, 3rd, 4th, and 5th brackets, if needed
for i in range(1, len(brackets[0])):
if income > brackets[status][i]:
tax += (brackets[status][i] - brackets[status][i - 1]) * rates[i]
else:
tax += (income - brackets[status][i - 1]) * rates[i]
return tax # Done
# Compute tax in the last (i.e., 6th) bracket
return tax + (income - brackets[status][4]) * rates[5]
main()
