Skip SNAP student TANF checks for non-students

changelog.d/snap-student-tanf-guard.fixed.md

@@ -0,0 +1 @@
+Avoid calculating TANF when SNAP student ineligibility is evaluated for people who are not higher-education students.

policyengine_us/tests/core/test_snap_student_tanf_dependency.py

@@ -0,0 +1,43 @@
+from policyengine_us import Simulation
+
+
+def _single_person_situation(person: dict) -> dict:
+    return {
+        "people": {
+            "person": person,
+        },
+        "tax_units": {
+            "tax_unit": {"members": ["person"]},
+        },
+        "spm_units": {
+            "spm_unit": {"members": ["person"]},
+        },
+        "families": {
+            "family": {"members": ["person"]},
+        },
+        "households": {
+            "household": {
+                "members": ["person"],
+                "state_code": {"2026": "CA"},
+            },
+        },
+    }
+
+
+def test_snap_student_ineligibility_skips_tanf_for_non_higher_ed_person():
+    simulation = Simulation(
+        situation=_single_person_situation(
+            {
+                "age": {"2026": 30},
+                "is_full_time_college_student": {"2026": False},
+                "is_part_time_college_student": {"2026": False},
+            }
+        )
+    )
+    simulation.trace = True
+
+    is_ineligible_student = simulation.calculate("is_snap_ineligible_student", 2026)
+
+    assert is_ineligible_student.tolist() == [False]
+    assert simulation.tracer.get_nb_requests("tanf_person") == 0
+    assert simulation.tracer.get_nb_requests("tanf") == 0

policyengine_us/variables/gov/usda/snap/eligibility/student/is_snap_ineligible_student.py

@@ -6,6 +6,7 @@ class is_snap_ineligible_student(Variable):
     entity = Person
     label = "Is an ineligible student for SNAP"
     definition_period = YEAR
+    defined_for = "is_snap_higher_ed_student"
     reference = "https://www.law.cornell.edu/uscode/text/7/2015#e"
 
     def formula(person, period, parameters):