diff --git a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_age_child_condition.py b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_age_child_condition.py
index 65a134aa..8ec5346b 100644
--- a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_age_child_condition.py
+++ b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_age_child_condition.py
@@ -5,9 +5,7 @@ class child_age_eligible(Variable):
     value_type = bool
     entity = Person
     label = "Child age eligibility requirements"
-    documentation = (
-        "Whether this person meets the age and disability requirements for eligibility"
-    )
+    documentation = "Whether this person meets the age and disability requirements for eligibility"
     definition_period = YEAR
 
     def formula(person, period, parameters):
@@ -17,16 +15,11 @@ def formula(person, period, parameters):
         Returns:
             bool: True if eligible (under standard age limit, or under disability age limit with disability), False otherwise
         """
-        # Get the benefit unit the person belongs to
-        benunit = person.benunit
-
         # Get person's characteristics
         age = person("age", period)
 
         # Get age thresholds from parameters
-        age_limits = parameters(
-            period
-        ).gov.hmrc.childcare_subsidies.tax_free_childcare.age_limits
+        age_limits = parameters(period).gov.hmrc.childcare_subsidies.tax_free_childcare.age_limits
         standard_age_limit = age_limits.standard_age_limit
         disability_age_limit = age_limits.disability_age_limit
 
@@ -47,4 +40,4 @@ def formula(person, period, parameters):
         # Combine conditions
         eligible = basic_age_condition | (age_under_disability_limit & is_disabled)
 
-        return eligible
+        return eligible
\ No newline at end of file
diff --git a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_income_condition.py b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_income_condition.py
index 2f91e7c8..7e1dcca2 100644
--- a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_income_condition.py
+++ b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_income_condition.py
@@ -9,8 +9,7 @@ class meets_income_requirements(Variable):
     definition_period = YEAR
 
     def formula(person, period, parameters):
-        """
-        Calculate if a person meets income requirements based on their age and income.
+        """Calculate if a person meets income requirements based on their age and income.
 
         Returns:
             bool: True if they meet the income conditions for their age group
@@ -35,9 +34,7 @@ def formula(person, period, parameters):
         yearly_eligible_income = total_income - investment_income
 
         # Get income thresholds from parameters
-        income_limits = parameters(
-            period
-        ).gov.hmrc.childcare_subsidies.tax_free_childcare.income_thresholds
+        income_limits = parameters(period).gov.hmrc.childcare_subsidies.tax_free_childcare.income_thresholds
         quarterly_income = yearly_eligible_income / 4
 
         # Age >= 21
@@ -58,6 +55,4 @@ def formula(person, period, parameters):
         )
 
         # Combine all conditions
-        return (
-            meets_adult_condition | meets_young_adult_condition | meets_youth_condition
-        )
+        return meets_adult_condition | meets_young_adult_condition | meets_youth_condition
\ No newline at end of file
diff --git a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_work_condition.py b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_work_condition.py
index 93e278a1..0d3ad034 100644
--- a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_work_condition.py
+++ b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/conditions/childcare_work_condition.py
@@ -5,14 +5,11 @@ class childcare_work_condition(Variable):
     value_type = bool
     entity = Person
     label = "Work conditions for tax-free childcare"
-    documentation = (
-        "Whether the person/couple meets work requirements for tax-free childcare"
-    )
+    documentation = "Whether the person/couple meets work requirements for tax-free childcare"
     definition_period = YEAR
 
     def formula(person, period, parameters):
-        """
-        Calculate if person meets work conditions for:
+        """Calculate if person meets work conditions for:
         - Single working adult
         - Couple where either both work or one works and other has disability/incapacity
         """
@@ -48,13 +45,11 @@ def formula(person, period, parameters):
         is_partner_working_with_disabled_person = (
             is_couple & partner_in_work & (is_disabled | has_incapacity)
         )
-        is_person_working_with_disabled_partner = (
-            is_couple & in_work & partner_has_condition
-        )
+        is_person_working_with_disabled_partner = is_couple & in_work & partner_has_condition
 
         return (
             single_working
             | couple_both_working
             | is_person_working_with_disabled_partner
             | is_partner_working_with_disabled_person
-        )
+        )
\ No newline at end of file
diff --git a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/tax_free_childcare_benefits.py b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/tax_free_childcare_benefits.py
index 0f8a3de5..b277be76 100644
--- a/policyengine_uk/variables/gov/hmrc/tax_free_childcare/tax_free_childcare_benefits.py
+++ b/policyengine_uk/variables/gov/hmrc/tax_free_childcare/tax_free_childcare_benefits.py
@@ -10,8 +10,7 @@ class tax_free_childcare(Variable):
     unit = GBP
 
     def formula(benunit, period, parameters):
-        """
-        Calculate the government contribution for tax-free childcare.
+        """Calculate the government contribution for tax-free childcare.
 
         Args:
             benunit: The benefit unit
@@ -25,9 +24,7 @@ def formula(benunit, period, parameters):
         parents_contribution = benunit("childcare_cost", period)
 
         # Get parameters from the parameter tree
-        p = parameters(
-            period
-        ).gov.hmrc.childcare_subsidies.tax_free_childcare.contribution_parameters
+        p = parameters(period).gov.hmrc.childcare_subsidies.tax_free_childcare.contribution_parameters
 
         # Check eligibility conditions
         meets_age_condition = benunit("child_age_eligible", period)
@@ -55,4 +52,4 @@ def formula(benunit, period, parameters):
             max_amount,
         )
 
-        return where(is_eligible, government_contribution, 0)
+        return where(is_eligible, government_contribution, 0)
\ No newline at end of file