#!/usr/bin/env python3;
###############################################################################
# This program computes federal income tax for single taxpayers.
# 
# Copyright © 2020 Richard Lesh.  All rights reserved.
###############################################################################

import Utils
import sys

# Begin Main
income = 0.
income_tax = 0.
if (len(sys.argv) == 2) :
    income = Utils.stodWithDefault(sys.argv[1], 0)
else :
    print("Syntax: {0:s} income".format(sys.argv[0]))
    sys.exit(1)
if (income <= 9875.) :
    income_tax += income * 0.10
else :
    income_tax += 9875. * 0.10
    if (income <= 40125.) :
        income_tax += (income - 9875.) * 0.12
    else :
        income_tax += (40125. - 9875.) * 0.12
        if (income <= 85525.) :
            income_tax += (income - 40125.) * 0.22
        else :
            income_tax += (85525. - 40125.) * 0.22
            if (income <= 163300.) :
                income_tax += (income - 85525.) * 0.24
            else :
                income_tax += (163300. - 85525.) * 0.24
                if (income <= 207350.) :
                    income_tax += (income - 163300.) * 0.32
                else :
                    income_tax += (207350. - 163300.) * 0.32
                    if (income <= 518400.) :
                        income_tax += (income - 207350.) * 0.35
                    else :
                        income_tax += (518400. - 207350.) * 0.35
                        if (income > 518400.) :
                            income_tax += (income - 518400.) * 0.37

print("Federal Income Tax: ${0:.2f}".format(income_tax))