diff --git a/Makefile b/Makefile
index 12b1226f9..2957944b4 100644
--- a/Makefile
+++ b/Makefile
@@ -90,7 +90,7 @@ EXCLUDED_PATHS = taxcalc/validation,docs/guide
 
 .PHONY=cstest
 cstest:
-	@-pycodestyle --exclude=$(EXCLUDED_PATHS) .
+	@-pycodestyle --ignore=W503,W504,E712 --exclude=$(EXCLUDED_PATHS) .
 	@-pycodestyle --ignore=E501,E121 $(TOPLEVEL_JSON_FILES)
 	@-pycodestyle --ignore=E501,E121 $(TAXCALC_JSON_FILES)
 	@-pycodestyle --ignore=E501,E121 $(TESTS_JSON_FILES)
diff --git a/extend_tcja.py b/extend_tcja.py
index 87a61fc53..ee782aef8 100644
--- a/extend_tcja.py
+++ b/extend_tcja.py
@@ -95,8 +95,8 @@ def main():
     # 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]
+    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
diff --git a/taxcalc/calcfunctions.py b/taxcalc/calcfunctions.py
index 3c674caea..7da32eca2 100644
--- a/taxcalc/calcfunctions.py
+++ b/taxcalc/calcfunctions.py
@@ -2759,7 +2759,7 @@ def PersonalTaxCredit(MARS, c00100, XTOT, nu18,
     # calculate Recovery Rebate Credit from CARES Act 2020 and/or ARPA 2021
     if c00100 < RRC_ps[MARS - 1]:
         recovery_rebate_credit = RRC_c * XTOT
-        recovery_rebate_credit += RRC_c_unit[MARS-1] + RRC_c_kids * nu18
+        recovery_rebate_credit += RRC_c_unit[MARS - 1] + RRC_c_kids * nu18
     elif 0 < c00100 < RRC_pe[MARS - 1]:
         prt = (
             (c00100 - RRC_ps[MARS - 1]) /
diff --git a/taxcalc/parameters.py b/taxcalc/parameters.py
index dfd2c0291..57031300d 100644
--- a/taxcalc/parameters.py
+++ b/taxcalc/parameters.py
@@ -370,7 +370,15 @@ def adjust_with_indexing(self, params_or_path, **kwargs):
                 ):
                     continue
                 if self._data[param].get("indexed", False):
+                    # pylint: disable=singleton-comparison
                     to_delete[param] = self.sel[param]["_auto"] == True
+                    # pylint warning message:
+                    #   Comparison 'self.sel[param]['_auto'] == True' should
+                    #   be 'self.sel[param]['_auto'] is True' if checking for
+                    #   the singleton value True, or
+                    #   'bool(self.sel[param]['_auto'])' if testing for
+                    #   truthiness
+                    # pylint: enable=singleton-comparison
                     needs_reset.append(param)
 
             self.delete(to_delete, **kwargs)
diff --git a/taxcalc/policy.py b/taxcalc/policy.py
index e804f30fc..c0e27f316 100644
--- a/taxcalc/policy.py
+++ b/taxcalc/policy.py
@@ -158,7 +158,7 @@ def parameter_list():
             Policy.DEFAULTS_FILE_PATH,
             Policy.DEFAULTS_FILE_NAME
         )
-        with open(path, 'r',  encoding='utf-8') as f:
+        with open(path, 'r', encoding='utf-8') as f:
             defaults = json.loads(f.read())  # pylint: disable=protected-access
         return [k for k in defaults if k != "schema"]
 
diff --git a/taxcalc/tests/test_policy.py b/taxcalc/tests/test_policy.py
index b1dedf02d..4f40468e5 100644
--- a/taxcalc/tests/test_policy.py
+++ b/taxcalc/tests/test_policy.py
@@ -1542,8 +1542,8 @@ def test_two_sets_of_tax_brackets():
     Test that II_brk? and PT_brk? values are the same under current law.
     """
     pol = Policy()
-    brackets = range(1, 7+1)
-    years = range(Policy.JSON_START_YEAR, Policy.LAST_KNOWN_YEAR+1)
+    brackets = range(1, 7 + 1)
+    years = range(Policy.JSON_START_YEAR, Policy.LAST_KNOWN_YEAR + 1)
     emsg = ''
     for year in years:
         pol.set_year(year)
diff --git a/taxcalc/tests/test_puf_var_stats.py b/taxcalc/tests/test_puf_var_stats.py
index b6e156d0c..1f436f9ab 100644
--- a/taxcalc/tests/test_puf_var_stats.py
+++ b/taxcalc/tests/test_puf_var_stats.py
@@ -61,7 +61,7 @@ def create_base_table(test_path):
     read_vars = list(records_varinfo.USABLE_READ_VARS - unused_var_set)
     # get read variable information from JSON file
     rec_vars_path = os.path.join(test_path, '..', 'records_variables.json')
-    with open(rec_vars_path, 'r',  encoding='utf-8') as rvfile:
+    with open(rec_vars_path, 'r', encoding='utf-8') as rvfile:
         read_var_dict = json.load(rvfile)
     # create table_dict with sorted read vars followed by sorted calc vars
     table_dict = {}
diff --git a/taxcalc/tests/test_reforms.py b/taxcalc/tests/test_reforms.py
index 3cb585bfb..a2eba0e76 100644
--- a/taxcalc/tests/test_reforms.py
+++ b/taxcalc/tests/test_reforms.py
@@ -58,7 +58,7 @@ def test_2017_law_reform(tests_path):
     }
     assert isinstance(pre_expect, dict)
     assert set(pre_expect.keys()).issubset(set(pre_mdata.keys()))
-    for name in pre_expect:
+    for name in pre_expect:  # pylint: disable=consider-using-dict-items
         aval = pre_mdata[name]
         if aval.ndim == 2:
             act = aval[0][0]  # comparing only first item in a vector parameter
@@ -153,7 +153,7 @@ def test_round_trip_reforms(fyear, tests_path):
         )
     fail_params = []
     msg = '\nRound-trip-reform and current-law-policy param values differ for:'
-    for pname in clp_mdata.keys():
+    for pname in clp_mdata.keys():  # pylint: disable=consider-using-dict-items
         rtr_val = rtr_mdata[pname]
         clp_val = clp_mdata[pname]
         if not np.allclose(rtr_val, clp_val):