diff --git a/process_report/processors/validate_billable_pi_processor.py b/process_report/processors/validate_billable_pi_processor.py
index 9a0fb70..88c62ba 100644
--- a/process_report/processors/validate_billable_pi_processor.py
+++ b/process_report/processors/validate_billable_pi_processor.py
@@ -31,9 +31,15 @@ def _get_billables(
         nonbillable_pis: list[str],
         nonbillable_projects: list[str],
     ):
+        def _str_to_lowercase(data):
+            return data.lower()
+
+        nonbillable_projects_lowercase = [
+            project.lower() for project in nonbillable_projects
+        ]
         return ~data[invoice.PI_FIELD].isin(nonbillable_pis) & ~data[
             invoice.PROJECT_FIELD
-        ].isin(nonbillable_projects)
+        ].apply(_str_to_lowercase).isin(nonbillable_projects_lowercase)
 
     def _process(self):
         self.data[invoice.IS_BILLABLE_FIELD] = self._get_billables(
diff --git a/process_report/tests/unit/processors/test_validate_billable_pi_processor.py b/process_report/tests/unit/processors/test_validate_billable_pi_processor.py
index 1d68167..ca99238 100644
--- a/process_report/tests/unit/processors/test_validate_billable_pi_processor.py
+++ b/process_report/tests/unit/processors/test_validate_billable_pi_processor.py
@@ -11,7 +11,9 @@ def test_remove_nonbillables(self):
         pis = [uuid.uuid4().hex for x in range(10)]
         projects = [uuid.uuid4().hex for x in range(10)]
         nonbillable_pis = pis[:3]
-        nonbillable_projects = projects[7:]
+        nonbillable_projects = [
+            project.upper() for project in projects[7:]
+        ]  # Test for case-insentivity
         billable_pis = pis[3:7]
         data = pandas.DataFrame({"Manager (PI)": pis, "Project - Allocation": projects})