Cant get python to follow the first if-elif-else statement

Question

This code follows the Joint account filings not the Singles account when I type in 0, I can't figure it out. Is it coded wrong? am I missing something? I cant figure out how to fix it. Thanks!

Problem Description: The United States federal personal income tax is calculated based on filing status and taxable income. There are four filing statuses: single filers and married filing jointly. The tax rates vary every year. Table 3.2 shows the rates for 2009. If you are, say, single with a taxable income of $10,000, the first $8,350 is taxed at 10% and the other $1,650 is taxed at 15%. So, your tax is $1,082.5. Table 1 2009 U.S. Federal Personal Tax Rates Marginal Tax Rate Single Married Filing Jointly or Qualified Widow(er) 10% $0 – $8,350 $0 – $16,700 15% $8,351– $33,950 $16,701 – $67,900 25% $33,951 – $82,250 $67,901 – $137,050 28% $82,251 – $171,550 $137,051 – $208,850 33% $171,551 – $372,950 $208,851 – $372,950 35% $372,951+ $372,951+ You are to write a program to compute personal income tax. Your program should prompt the user to enter the filing status and taxable income and compute the tax. Enter 0 for single filers and 1 for married filing jointly.

#filings
Single = 0
Joint = 1

#amount taxed for singles
st1 = 8350
st2 = 25599
st3 = 48299
st4 = 89299
st5 = 201399

#filing brackets for singles
s1 = 8350
s2 = 33950
s3 = 82250
s4 = 171550
s5 = 372950

#amount taxed for joint
jt1 = 16700
jt2 = 51199
jt3 = 69149
jt4 = 71799
jt5 = 164099

#filings brackets for joint
j1 = 16700
j2 = 67900
j3 = 137050
j4 = 208850
j5 = 372950

#percents 
p1 = 10/100
p2 = 15/100
p3 = 25/100
p4 = 28/100
p5 = 33/100
p6 = 35/100


#input of income and filings
filing = input('Enter the filing status:')
income = float(input('Enter the taxable income:'))

if filing==Single:
    
    if income<=s1:
        tax = income * p1
        format_tax = "{:.2f}".format(tax)
        print('Tax is', format_tax)

    elif income>s1 and income<=s2:
        i1 = income-st1
        i2 = st1*p1
        i3 = i1*p2
        tax = i3 + i2
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>s2 and income<=s3:
        i1 = income - st1
        i2 = i1 - st2
        tax1 = st1*p1
        tax2 = st2*p2
        tax3 = i2*p3
        tax = tax1+tax2+tax3
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>s3 and income<=s4:
        i1 = income - st1
        i2 = i1 - st2
        i3 = i2 - st3
        tax1 = st1*p1
        tax2 = st2*p2
        tax3 = st3*p3
        tax4 = i3*p4
        tax=tax1+tax2+tax3+tax4
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>s4 and income<=s5:
        i1 = income - st1
        i2 = i1 - st2
        i3 = i2 - st3
        i4 = i3 - st4
        tax1 = st1*p1
        tax2 = st2*p2
        tax3 = st3*p3
        tax4 = st4*p4
        tax5 = i4*p5
        tax=tax1+tax2+tax3+tax4+tax5
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    else:
        i1 = income - st1
        i2 = i1 - st2
        i3 = i2 - st3
        i4 = i3 - st4
        i5 = i4 - st5
        tax1 = st1*p1
        tax2 = st2*p2
        tax3 = st3*p3
        tax4 = st4*p4
        tax5 = st5*p5
        tax6 = i5*p6
        tax=tax1+tax2+tax3+tax4+tax5+tax6
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)


else:

 
    if income <= j1:
        tax = income * p1
        format_tax = "{:.2f}".format(tax)
        print('Tax is', format_tax)

    elif income >j1 and income<=j2:
        i1 = income-jt1
        i2 = jt1*p1
        i3 = i1*p2
        tax = i3 + i2
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>j2 and income<=j3:
        i1 = income - jt1
        i2 = i1 - jt2
        tax1 = jt1*p1
        tax2 = jt2*p2
        tax3 = i2*p3
        tax = tax1+tax2+tax3
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>j3 and income<=j4:
        i1 = income - jt1
        i2 = i1 - jt2
        i3 = i2 - jt3
        tax1 = jt1*p1
        tax2 = jt2*p2
        tax3 = jt3*p3
        tax4 = i3*p4
        tax=tax1+tax2+tax3+tax4
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    elif income>j4 and income<=j5:
        i1 = income - jt1
        i2 = i1 - jt2
        i3 = i2 - jt3
        i4 = i3 - jt4
        tax1 = jt1*p1
        tax2 = jt2*p2
        tax3 = jt3*p3
        tax4 = jt4*p4
        tax5 = i4*p5
        tax=tax1+tax2+tax3+tax4+tax5
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)

    else:
        i1 = income - jt1
        i2 = i1 - jt2
        i3 = i2 - jt3
        i4 = i3 - jt4
        i5 = i4 - jt5
        tax1 = jt1*p1
        tax2 = jt2*p2
        tax3 = jt3*p3
        tax4 = jt4*p4
        tax5 = jt5*p5
        tax6 = i5*p6
        tax=tax1+tax2+tax3+tax4+tax5+tax6
        format_tax = '{:.2f}'. format(tax)
        print('Tax is', format_tax)