diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_report_service.py b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_report_service.py
index f997ef7e5..95ba93d70 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_report_service.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_report_service.py
@@ -18,6 +18,25 @@ class ProcessInstanceReportFilter:
     end_to: Optional[int] = None
     process_status: Optional[list[str]] = None
 
+    def to_dict(self) -> dict[str, str]:
+        """to_dict."""
+        d = {}
+
+        if self.process_model_identifier is not None:
+            d["process_model_identifier"] = self.process_model_identifier
+        if self.start_from is not None:
+            d["start_from"] = str(self.start_from)
+        if self.start_to is not None:
+            d["start_to"] = str(self.start_to)
+        if self.end_from is not None:
+            d["end_from"] = str(self.end_from)
+        if self.end_to is not None:
+            d["end_to"] = str(self.end_to)
+        if self.process_status is not None:
+            d["process_status"] = ",".join(self.process_status)
+
+        return d
+
 
 class ProcessInstanceReportService:
     """ProcessInstanceReportService."""
diff --git a/spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_process_instance_report_service.py b/spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_process_instance_report_service.py
index 48fd52ba3..0e3227a1b 100644
--- a/spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_process_instance_report_service.py
+++ b/spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_process_instance_report_service.py
@@ -13,10 +13,90 @@ from spiffworkflow_backend.services.process_instance_report_service import (
     ProcessInstanceReportFilter,
 )
 from spiffworkflow_backend.services.process_instance_report_service import (
+    ProcessInstanceReportFilter,
     ProcessInstanceReportService,
 )
 
 
+class TestProcessInstanceReportFilter(BaseTest):
+    """TestProcessInstanceReportFilter."""
+    def test_empty_filter_to_dict(
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """Docstring."""
+        d = ProcessInstanceReportFilter().to_dict()
+
+        assert d == {}
+
+    def test_string_value_filter_to_dict(
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """Docstring."""
+        d = ProcessInstanceReportFilter(
+            process_model_identifier="bob"
+        ).to_dict()
+
+        assert d == {"process_model_identifier": "bob"}
+
+    def test_int_value_filter_to_dict(
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """Docstring."""
+        d = ProcessInstanceReportFilter(
+            start_from=1,
+            start_to=2,
+            end_from=3,
+            end_to=4,
+        ).to_dict()
+
+        assert d == {
+            "start_from": "1",
+            "start_to": "2",
+            "end_from": "3",
+            "end_to": "4",
+        }
+
+    def test_list_single_value_filter_to_dict(
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """Docstring."""
+        d = ProcessInstanceReportFilter(
+            process_status=["bob"]
+        ).to_dict()
+
+        assert d == {"process_status": "bob"}
+
+    def test_list_multiple_value_filter_to_dict(
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """Docstring."""
+        d = ProcessInstanceReportFilter(
+            process_status=["joe", "bob", "sue"]
+        ).to_dict()
+
+        assert d == {"process_status": "joe,bob,sue"}
+
+
 class TestProcessInstanceReportService(BaseTest):
     """TestProcessInstanceReportService."""