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extend_tcja.py
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"""
This script generates a JSON reform file, which could be called
extend_tcja.json, that can serve as an alternative baseline to
current-law policy (which ends TCJA temporary provisions after 2025).
USAGE: (taxcalc-dev) Tax-Calculator% python extend_tcja.py > ext.json
THEN CHECK: % diff ext.json taxcalc/reforms/ext.json
IF DIFFS: % mv ext.json taxcalc/reforms/ext.json
WHEN TO USE: use this script to update reforms/ext.json in these situations:
(a) whenever inflation rates in the growfactors.csv files are changed
OR
(b) whenever inflation-indexed parameters are updated (usually as part
of changes that increase the value of Policy.LAST_KNOWN_YEAR).
"""
import sys
import numpy
import taxcalc
TCJA_CATEGORY = None # set to None to generate all TCJA temporary provisions
TCJA_PARAMETERS = {
# category 1 ...
"II_rt1": {"indexed": False, "category": 1},
"II_brk1": {"indexed": True, "category": 1},
"PT_rt1": {"indexed": False, "category": 1},
"PT_brk1": {"indexed": True, "category": 1},
"II_rt2": {"indexed": False, "category": 1},
"II_brk2": {"indexed": True, "category": 1},
"PT_rt2": {"indexed": False, "category": 1},
"PT_brk2": {"indexed": True, "category": 1},
"II_rt3": {"indexed": False, "category": 1},
"II_brk3": {"indexed": True, "category": 1},
"PT_rt3": {"indexed": False, "category": 1},
"PT_brk3": {"indexed": True, "category": 1},
"II_rt4": {"indexed": False, "category": 1},
"II_brk4": {"indexed": True, "category": 1},
"PT_rt4": {"indexed": False, "category": 1},
"PT_brk4": {"indexed": True, "category": 1},
"II_rt5": {"indexed": False, "category": 1},
"II_brk5": {"indexed": True, "category": 1},
"PT_rt5": {"indexed": False, "category": 1},
"PT_brk5": {"indexed": True, "category": 1},
"II_rt6": {"indexed": False, "category": 1},
"II_brk6": {"indexed": True, "category": 1},
"PT_rt6": {"indexed": False, "category": 1},
"PT_brk6": {"indexed": True, "category": 1},
"II_rt7": {"indexed": False, "category": 1},
"II_brk7": {"indexed": True, "category": 1},
"PT_rt7": {"indexed": False, "category": 1},
"PT_brk7": {"indexed": True, "category": 1},
# category 2 ...
"CTC_c": {"indexed": False, "category": 2},
"ACTC_c": {"indexed": False, "category": 2},
"ODC_c": {"indexed": False, "category": 2},
"CTC_ps": {"indexed": False, "category": 2},
"ACTC_Income_thd": {"indexed": False, "category": 2},
# category 3 ...
"AMT_em": {"indexed": True, "category": 3},
"AMT_em_ps": {"indexed": True, "category": 3},
"AMT_em_pe": {"indexed": True, "category": 3},
# category 4 ...
"STD": {"indexed": True, "category": 4},
# category 5 ...
"ID_AllTaxes_c": {"indexed": False, "category": 5},
"ID_Charity_crt_cash": {"indexed": False, "category": 5},
"ID_Casualty_hc": {"indexed": False, "category": 5},
"ID_Miscellaneous_hc": {"indexed": False, "category": 5},
"ID_ps": {"indexed": True, "category": 5},
"ID_prt": {"indexed": False, "category": 5},
"ID_crt": {"indexed": False, "category": 5},
# category 6 ...
"II_em": {"indexed": True, "category": 6},
"II_em_ps": {"indexed": True, "category": 6},
# category 7 ...
"PT_qbid_rt": {"indexed": False, "category": 7},
"PT_qbid_taxinc_thd": {"indexed": True, "category": 7},
"PT_qbid_taxinc_gap": {"indexed": False, "category": 7},
"PT_qbid_w2_wages_rt": {"indexed": False, "category": 7},
"PT_qbid_alt_w2_wages_rt": {"indexed": False, "category": 7},
"PT_qbid_alt_property_rt": {"indexed": False, "category": 7},
# category 8 ...
"ALD_BusinessLosses_c": {"indexed": True, "category": 8},
}
def main():
"""
High-level script logic.
"""
# pylint: disable=too-many-statements
# identify last parameter name in TCJA_PARAMETERS
last_pname = list(TCJA_PARAMETERS.keys())[-1]
# calculate 2025-to-2026 parameters indexing factor
pol = taxcalc.Policy()
pirates = pol.inflation_rates()
ifactor25 = 1.0 + pirates[2025 - taxcalc.Policy.JSON_START_YEAR]
ifactor28 = 1.0 + pirates[2028 - taxcalc.Policy.JSON_START_YEAR]
# specify extend-TCJA-beyond-2025 reform
# ... get 2025 parameter values
year = 2025
pol.set_year(year)
pdata = dict(pol.items())
# ... write reform header comments
print(f'// REFORM TO EXTEND TEMPORARY TCJA PROVISIONS BEYOND {year}')
print(f'// USING TAX-CALCULATOR {taxcalc.__version__}')
print(f'// WITH 2025-to-2026 INDEXING FACTOR = {ifactor25:.6f}')
print(f'// AND 2028-to-2029 INDEXING FACTOR = {ifactor28:.6f}')
if TCJA_CATEGORY:
print(f'// ONLY TCJA PROVISIONS IN CATEGORY {TCJA_CATEGORY}')
print('{')
# ... set 2026/29 nonreverted values for the parameters set to revert
left_brace = '{'
right_brace = '}'
year = 2026
for pname, pinfo in TCJA_PARAMETERS.items():
if TCJA_CATEGORY and pinfo['category'] != TCJA_CATEGORY:
continue # skip this parameter
if pname == 'ALD_BusinessLosses_c':
ifactor = ifactor28
year = 2029
pol.set_year(2028)
pdata = dict(pol.items())
else:
if year != 2026:
pol.set_year(2025)
pdata = dict(pol.items())
ifactor = ifactor25
year = 2026
trailing_comma = '' if pname == last_pname else ','
if pinfo['indexed']:
pval = pdata[pname][0] * ifactor
if isinstance(pval, numpy.ndarray):
# handle vector parameter
pval = numpy.minimum(9e99, pval.round(2))
sys.stdout.write(f' "{pname}": ')
sys.stdout.write(f'{left_brace}"{year}": ')
sys.stdout.write(f'{pval.tolist()}')
sys.stdout.write(f'{right_brace}{trailing_comma}\n')
else:
# handle scalar parameter
pval = min(9e99, pval)
sys.stdout.write(f' "{pname}": ')
sys.stdout.write(f'{left_brace}"{year}": ')
sys.stdout.write(f'{pval*ifactor:.2f}')
sys.stdout.write(f'{right_brace}{trailing_comma}\n')
else: # if parameter is not indexed
pval = pdata[pname][0]
if isinstance(pval, numpy.ndarray):
# handle vector parameter
pval = numpy.minimum(9e99, pval.round(2))
sys.stdout.write(f' "{pname}": ')
sys.stdout.write(f'{left_brace}"{year}": ')
sys.stdout.write(f'{pval.tolist()}')
sys.stdout.write(f'{right_brace}{trailing_comma}\n')
else:
# handle scalar parameter
sys.stdout.write(f' "{pname}": ')
sys.stdout.write(f'{left_brace}"{year}": ')
sys.stdout.write(f'{pval:.2f}')
sys.stdout.write(f'{right_brace}{trailing_comma}\n')
print('}')
return 0
# end main function code
if __name__ == '__main__':
sys.exit(main())