TaxCalculator Calculator¶
TaxCalculator Calculator
taxcalc.calculator¶

class
taxcalc.calculator.
Calculator
(policy=None, records=None, verbose=False, sync_years=True, consumption=None)[source]¶ Constructor for the Calculator class.
 Parameters
policy (Policy class object) – this argument must be specified and object is copied for internal use
records (Records class object) – this argument must be specified and object is copied for internal use
verbose (boolean) – specifies whether or not to write to stdout dataloaded and dataextrapolated progress reports; default value is false.
sync_years (boolean) – specifies whether or not to synchronize policy year and records year; default value is true.
consumption (Consumption class object) – specifies consumption response assumptions used to calculate “effective” marginal tax rates; default is None, which implies no consumption responses assumed in marginal tax rate calculations; when argument is an object it is copied for internal use; also specifies consumption value of inkind benefis with no inkind consumption values specified implying consumption value is equal to government cost of providing the inkind benefits
 Raises
ValueError: – if parameters are not the appropriate type.
 Returns
class instance
 Return type
Notes
The most efficient way to specify currentlaw and reform Calculator objects is as follows:
pol = Policy() rec = Records() calc1 = Calculator(policy=pol, records=rec) # currentlaw pol.implement_reform(…) calc2 = Calculator(policy=pol, records=rec) # reform
All calculations are done on the internal copies of the Policy and Records objects passed to each of the two Calculator constructors.

_calc_one_year
(zero_out_calc_vars=False)[source]¶ Call all the functions except those in the calc_all() method.

advance_to_year
(year)[source]¶ The advance_to_year function gives an optional way of implementing increment year functionality by immediately specifying the year as input. New year must be at least the current year.

array
(variable_name, variable_value=None)[source]¶  If variable_value is None, return numpy ndarray containing the
named variable in embedded Records object.
 If variable_value is not None, set named variable in embedded Records
object to specified variable_value and return None (which can be ignored).

atr_graph
(calc, mars='ALL', atr_measure='combined', pop_quantiles=False)[source]¶ Create average tax rate graph that can be written to an HTML file (using the write_graph_file utility function) or shown on the screen immediately in an interactive or notebook session (following the instructions in the documentation of the xtr_graph_plot utility function). The graph shows the mean average tax rate for each expandedincome percentile excluding any percentile that includes a filing unit with negative or zero basline (self) expanded income.
 Parameters
calc (Calculator object) – calc represents the reform while self represents the baseline, where both self and calc have calculated taxes for this year before being used by this method
mars (integer or string) –
specifies which filing status subgroup to show in the graph
’ALL’: include all filing units in sample
1: include only single filing units
2: include only marriedfilingjointly filing units
3: include only marriedfilingseparately filing units
4: include only headofhousehold filing units
atr_measure (string) –
specifies which average tax rate to show on graph’s y axis
’itax’: average individual income tax rate
’ptax’: average payroll tax rate
’combined’: sum of average income and payroll tax rates
pop_quantiles (boolean) – specifies whether or not weighted_deciles contain an equal number of people (True) or an equal number of filing units (False)
 Returns
 Return type
graph that is a bokeh.plotting figure object

calc_all
(zero_out_calc_vars=False)[source]¶ Call all taxcalculation functions for the current_year.

ce_aftertax_income
(calc, custom_params=None, require_no_agg_tax_change=True)[source]¶ Return dictionary that contains certaintyequivalent of the expected utility of aftertax expanded income computed for several constantrelativeriskaversion parameter values for each of two Calculator objects: self, which represents the prereform situation, and calc, which represents the postreform situation, both of which MUST have had calc_call() called before being passed to this function.
IMPORTANT NOTES: These normative welfare calculations are very simple. It is assumed that utility is a function of only consumption, and that consumption is equal to aftertax income. This means that any assumed responses that change work effort will not affect utility via the correpsonding change in leisure. And any saving response to changes in aftertax income do not affect consumption.
The cmin value is the consumption level below which marginal utility is considered to be constant. This allows the handling of filing units with very low or even negative aftertax expanded income in the expectedutility and certaintyequivalent calculations.

consump_benval_params
()[source]¶ Return list of benefitconsumptionvalue parameter values in embedded Consumption object.

dataframe
(variable_list, all_vars=False)[source]¶ Return Pandas DataFrame containing the listed variables from the embedded Records object. If all_vars is True, then the variable_list is ignored and all variables used as input to and calculated by the Calculator.calc_all() method (which does not include marginal tax rates) are included in the returned Pandas DataFrame.

diagnostic_table
(num_years)[source]¶ Generate multiyear diagnostic table containing aggregate statistics; this method leaves the Calculator object unchanged.
 Parameters
num_years (Integer) – number of years to include in diagnostic table starting with the Calculator object’s current_year (must be at least one and no more than what would exceed Policy end_year)
 Returns
 Return type
Pandas DataFrame object containing the multiyear diagnostic table

difference_table
(calc, groupby, tax_to_diff, pop_quantiles=False)[source]¶ Get results from self and calc, sort them by expanded_income into table rows defined by groupby, compute grouped statistics, and return taxdifference table as a Pandas dataframe. This method leaves the Calculator objects unchanged. Note that the returned tables have consistent income groups (based on the self expanded_income) even though the baseline expanded_income in self and the reform expanded_income in calc are different.
 Parameters
calc (Calculator object) – calc represents the reform while self represents the baseline
groupby (String object) – options for input: ‘weighted_deciles’, ‘standard_income_bins’ determines how the columns in resulting Pandas DataFrame are sorted
tax_to_diff (String object) – options for input: ‘iitax’, ‘payrolltax’, ‘combined’ specifies which tax to difference
pop_quantiles (boolean) – specifies whether or not weighted_deciles contain an equal number of people (True) or an equal number of filing units (False)
and typical usage (Returns) –
 –
= calc1.difference_table(calc2 (diff) –
'weighted_deciles' –
'iitax') –
calc1 is a baseline Calculator object ((where) –
calc2 is a reform Calculator object) (and) –
returned diff is a difference table as a Pandas DataFrame (The) –
DIST_TABLE_COLUMNS and groupby rows. (with) –
NOTE (when groupby is 'weighted_deciles', the returned table has three) – extra rows containing topdecile detail consisting of statistics for the 0.900.95 quantile range (bottom half of top decile), for the 0.950.99 quantile range, and for the 0.991.00 quantile range (top one percent); and the returned table splits the bottom decile into filing units with negative (denoted by a 010n row label), zero (denoted by a 010z row label), and positive (denoted by a 010p row label) values of the specified income_measure.

distribution_tables
(calc, groupby, pop_quantiles=False, scaling=True)[source]¶ Get results from self and calc, sort them by expanded_income into table rows defined by groupby, compute grouped statistics, and return tables as a pair of Pandas dataframes. This method leaves the Calculator object(s) unchanged. Note that the returned tables have consistent income groups (based on the self expanded_income) even though the baseline expanded_income in self and the reform expanded_income in calc are different.
 Parameters
calc (Calculator object or None) – typically represents the reform while self represents the baseline; if calc is None, the second returned table is None
groupby (String object) –
 options for input: ‘weighted_deciles’, ‘standard_income_bins’,
’soi_agi_bins’
determines how the columns in resulting Pandas DataFrame are sorted
pop_quantiles (boolean) – specifies whether or not weighted_deciles contain an equal number of people (True) or an equal number of filing units (False)
scaling (boolean) – specifies create_distribution_table utility function argument that determines whether table entry values are scaled or not
and typical usage (Return) –
 –
dist1 –
= calc1.distribution_tables(calc2 (dist2) –
'weighted_deciles') –
OR –
dist1 –
= calc1.distribution_tables(None (_) –
'weighted_deciles') –
calc1 is a baseline Calculator object ((where) –
calc2 is a reform Calculator object) (and) –
of the dist1 and optional dist2 is a distribution table as a (Each) –
DataFrame with DIST_TABLE_COLUMNS and groupby rows. (Pandas) –
NOTE (when groupby is 'weighted_deciles', the returned tables have 3) – extra rows containing topdecile detail consisting of statistics for the 0.900.95 quantile range (bottom half of top decile), for the 0.950.99 quantile range, and for the 0.991.00 quantile range (top one percent); and the returned table splits the bottom decile into filing units with negative (denoted by a 010n row label), zero (denoted by a 010z row label), and positive (denoted by a 010p row label) values of the specified income_measure.

incarray
(variable_name, variable_add)[source]¶ Add variable_add to named variable in embedded Records object.

mtr
(variable_str='e00200p', negative_finite_diff=False, zero_out_calculated_vars=False, calc_all_already_called=False, wrt_full_compensation=True)[source]¶ Calculates the marginal payroll, individual income, and combined tax rates for every tax filing unit, leaving the Calculator object in exactly the same state as it would be in after a calc_all() call.
The marginal tax rates are approximated as the change in tax liability caused by a small increase (the finite_diff) in the variable specified by the variable_str divided by that small increase in the variable, when wrt_full_compensation is false.
If wrt_full_compensation is true, then the marginal tax rates are computed as the change in tax liability divided by the change in total compensation caused by the small increase in the variable (where the change in total compensation is the sum of the small increase in the variable and any increase in the employer share of payroll taxes caused by the small increase in the variable).
If using ‘e00200s’ as variable_str, the marginal tax rate for all records where MARS != 2 will be missing. If you want to perform a function such as np.mean() on the returned arrays, you will need to account for this.
 Parameters
variable_str (string) – specifies type of income or expense that is increased to compute the marginal tax rates. See Notes for list of valid variables.
negative_finite_diff (boolean) – specifies whether or not marginal tax rates are computed by subtracting (rather than adding) a small finite_diff amount to the specified variable.
zero_out_calculated_vars (boolean) – specifies value of zero_out_calc_vars parameter used in calls of Calculator.calc_all() method.
calc_all_already_called (boolean) – specifies whether self has already had its Calculor.calc_all() method called, in which case this method will not do a final calc_all() call but use the incoming embedded Records object as the outgoing Records object embedding in self.
wrt_full_compensation (boolean) – specifies whether or not marginal tax rates on earned income are computed with respect to (wrt) changes in total compensation that includes the employer share of OASDI and HI payroll taxes.
 Returns
A tuple of numpy arrays in the following order
mtr_payrolltax (an array of marginal payroll tax rates.)
mtr_incometax (an array of marginal individual income tax rates.)
mtr_combined (an array of marginal combined tax rates, which is) – the sum of mtr_payrolltax and mtr_incometax.
Notes
The arguments zero_out_calculated_vars and calc_all_already_called cannot both be true.
Valid variable_str values are: ‘e00200p’, taxpayer wage/salary earnings (also included in e00200); ‘e00200s’, spouse wage/salary earnings (also included in e00200); ‘e00900p’, taxpayer Schedule C selfemployment income (also in e00900); ‘e00300’, taxable interest income; ‘e00400’, federallytaxexempt interest income; ‘e00600’, all dividends included in AGI ‘e00650’, qualified dividends (also included in e00600) ‘e01400’, federallytaxable IRA distribution; ‘e01700’, federallytaxable pension benefits; ‘e02000’, Schedule E total net income/loss ‘e02400’, all social security (OASDI) benefits; ‘p22250’, shortterm capital gains; ‘p23250’, longterm capital gains; ‘e18500’, Schedule A realestatetax paid; ‘e19200’, Schedule A interest paid; ‘e26270’, Scorporation/partnership income (also included in e02000); ‘e19800’, Charity cash contributions; ‘e20100’, Charity noncash contributions; ‘k1bx14p’, Partnership income (also included in e26270 and e02000).

mtr_graph
(calc, mars='ALL', mtr_measure='combined', mtr_variable='e00200p', alt_e00200p_text='', mtr_wrt_full_compen=False, income_measure='expanded_income', pop_quantiles=False, dollar_weighting=False)[source]¶ Create marginal tax rate graph that can be written to an HTML file (using the write_graph_file utility function) or shown on the screen immediately in an interactive or notebook session (following the instructions in the documentation of the xtr_graph_plot utility function).
 Parameters
calc (Calculator object) – calc represents the reform while self represents the baseline
mars (integer or string) –
specifies which filing status subgroup to show in the graph
’ALL’: include all filing units in sample
1: include only single filing units
2: include only marriedfilingjointly filing units
3: include only marriedfilingseparately filing units
4: include only headofhousehold filing units
mtr_measure (string) –
specifies which marginal tax rate to show on graph’s y axis
’itax’: marginal individual income tax rate
’ptax’: marginal payroll tax rate
’combined’: sum of marginal income and payroll tax rates
mtr_variable (string) – any string in the Calculator.VALID_MTR_VARS set specifies variable to change in order to compute marginal tax rates
alt_e00200p_text (string) – text to use in place of mtr_variable when mtr_variable is ‘e00200p’; if empty string then use ‘e00200p’
mtr_wrt_full_compen (boolean) – see documentation of Calculator.mtr() argument wrt_full_compensation (value has an effect only if mtr_variable is ‘e00200p’)
income_measure (string) –
specifies which income variable to show on the graph’s x axis
’wages’: wage and salary income (e00200)
’agi’: adjusted gross income, AGI (c00100)
 ’expanded_income’: broader than AGI (see definition in
calcfunctions.py file).
pop_quantiles (boolean) – specifies whether or not weighted_deciles contain an equal number of people (True) or an equal number of filing units (False)
dollar_weighting (boolean) – False implies both income_measure percentiles on x axis and mtr values for each percentile on the y axis are computed without using dollar income_measure weights (just sampling weights); True implies both income_measure percentiles on x axis and mtr values for each percentile on the y axis are computed using dollar income_measure weights (in addition to sampling weights). Specifying True produces a graph x axis that shows income_measure (not filing unit) percentiles.
 Returns
 Return type
graph that is a bokeh.plotting figure object

n65
()[source]¶ Return numpy ndarray containing the number of individuals age 65+ in each filing unit.

pch_graph
(calc, pop_quantiles=False)[source]¶ Create percentage change in aftertax expanded income graph that can be written to an HTML file (using the write_graph_file utility function) or shown on the screen immediately in an interactive or notebook session (following the instructions in the documentation of the xtr_graph_plot utility function). The graph shows the dollarweighted mean percentage change in aftertax expanded income for each expandedincome percentile excluding any percentile that includes a filing unit with negative or zero basline (self) expanded income.
 Parameters
calc (Calculator object) – calc represents the reform while self represents the baseline, where both self and calc have calculated taxes for this year before being used by this method
pop_quantiles (boolean) – specifies whether or not weighted_deciles contain an equal number of people (True) or an equal number of filing units (False)
 Returns
 Return type
graph that is a bokeh.plotting figure object

policy_param
(param_name, param_value=None)[source]¶  If param_value is None, return named parameter in
embedded Policy object.
 If param_value is not None, set named parameter in
embedded Policy object to specified param_value and return None (which can be ignored).

static
read_json_param_objects
(reform, assump)[source]¶ Read JSON reform and assump objects and return a composite dictionary containing four key:dict pairs: ‘policy’:dict, ‘consumption’:dict, ‘growdiff_baseline’:dict, and ‘growdiff_response’:dict.
Note that either of the two function arguments can be None. If reform is None, the dict in the ‘policy’:dict pair is empty. If assump is None, the dict in all the other key:dict pairs is empty.
Also note that either of the two function arguments can be strings containing a valid JSON string (rather than a local filename).
Either of the two function arguments can also be a valid URL string beginning with ‘http’ and pointing to a valid JSON file hosted online.
The reform file/URL contents or JSON string must be like this: {“policy”: {…}} OR {…} (in other words, the toplevel policy key is optional) and the assump file/URL contents or JSON string must be like this: {“consumption”: {…},
“growdiff_baseline”: {…}, “growdiff_response”: {…}}
The {…} should be empty like this {} if not specifying a policy reform or if not specifying any nondefault economic assumptions of that type.
The ‘policy’ subdictionary of the returned dictionary is suitable as input into the Policy.implement_reform method.
The ‘consumption’ subdictionary of the returned dictionary is suitable as input into the Consumption.update_consumption method.
The ‘growdiff_baseline’ subdictionary of the returned dictionary is suitable as input into the GrowDiff.update_growdiff method.
The ‘growdiff_response’ subdictionary of the returned dictionary is suitable as input into the GrowDiff.update_growdiff method.

static
reform_documentation
(params, policy_dicts=None)[source]¶ Generate reform documentation versus currentlaw policy.
 Parameters
params (dict) – dictionary is structured like dict returned from the static Calculator.read_json_param_objects() method
policy_dicts (list of dict or None) – each dictionary in list is a params[‘policy’] dictionary representing second and subsequent elements of a compound reform; None implies no compound reform with the simple reform characterized in the params[‘policy’] dictionary
 Returns
doc – the documentation for the specified policy reform
 Return type
String

restore_records
()[source]¶ Set the embedded Records object to the stored Records object that was saved in the last call to the store_records() method.

store_records
()[source]¶ Make internal copy of embedded Records object that can then be restored after interim calculations that make temporary changes to the embedded Records object.

total_weight
()[source]¶ Return allfilingunit total of sampling weights. NOTE: var_weighted_mean = calc.weighted_total(var)/calc.total_weight()