recipe01_py.html

<title>recipe01.py</title><pre>
import pandas as pd
from taxcalc import *

# read an "old" reform file from Tax-Calculator website
# ("old" means the reform file is defined relative to pre-TCJA policy)
reforms_url = ('https://raw.githubusercontent.com/'
               'PSLmodels/Tax-Calculator/master/taxcalc/reforms/')

# specify reform dictionary for pre-TCJA policy
reform1 = Policy.read_json_reform(reforms_url + '2017_law.json')

# specify reform dictionary for TCJA as passed by Congress in late 2017
reform2 = Policy.read_json_reform(reforms_url + 'TCJA.json')

# specify Policy object for pre-TCJA policy
bpolicy = Policy()
bpolicy.implement_reform(reform1, print_warnings=False, raise_errors=False)
assert not bpolicy.parameter_errors

# specify Policy object for TCJA reform relative to pre-TCJA policy
rpolicy = Policy()
rpolicy.implement_reform(reform1, print_warnings=False, raise_errors=False)
assert not rpolicy.parameter_errors
rpolicy.implement_reform(reform2, print_warnings=False, raise_errors=False)
assert not rpolicy.parameter_errors

# specify Calculator objects using bpolicy and rpolicy
recs = Records.cps_constructor()
calc1 = Calculator(policy=bpolicy, records=recs)
calc2 = Calculator(policy=rpolicy, records=recs)

cyr = 2018

# calculate for specified cyr
calc1.advance_to_year(cyr)
calc1.calc_all()
calc2.advance_to_year(cyr)
calc2.calc_all()

# compare aggregate individual income tax revenue in cyr
iitax_rev1 = calc1.weighted_total('iitax')
iitax_rev2 = calc2.weighted_total('iitax')

# construct reform-vs-baseline difference table with results for income deciles
diff_table = calc1.difference_table(calc2, 'weighted_deciles', 'iitax')
assert isinstance(diff_table, pd.DataFrame)
diff_extract = pd.DataFrame()
dif_colnames = ['count', 'tax_cut', 'tax_inc',
                'tot_change', 'mean', 'pc_aftertaxinc']
ext_colnames = ['funits(#m)', 'taxfall(#m)', 'taxrise(#m)',
                'agg_diff($b)', 'mean_diff($)', 'aftertax_income_diff(%)']
for dname, ename in zip(dif_colnames, ext_colnames):
    diff_extract[ename] = diff_table[dname]

# print total revenue estimates for cyr
# (estimates in billons of dollars)
print('{}_REFORM1_iitax_rev($B)= {:.3f}'.format(cyr, iitax_rev1 * 1e-9))
print('{}_REFORM2_iitax_rev($B)= {:.3f}'.format(cyr, iitax_rev2 * 1e-9))
print('')

# print reform2-vs-reform1 difference table
title = 'Extract of {} income-tax difference table by expanded-income decile'
print(title.format(cyr))
print('(taxfall is count of funits with cut in income tax in reform 2 vs 1)')
print('(taxrise is count of funits with rise in income tax in reform 2 vs 1)')
print(diff_extract.to_string())
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