diff --git a/domain/abri/abandonment.py b/domain/abri/abandonment.py
new file mode 100644
index 000000000..b91a25c6f
--- /dev/null
+++ b/domain/abri/abandonment.py
@@ -0,0 +1,13 @@
+from typing import Optional
+
+from domain.abri.models import AbandonReason
+
+
+def abandon_reason_for_outcome(outcome: Optional[str]) -> AbandonReason:
+    """The OpenHousing abandonment reason code for a HubSpot deal outcome.
+
+    The single mapping point from HubSpot's outcome to a coded reason. For now
+    every outcome maps to CARDED; the real outcome-to-code table is a follow-up
+    (needs Abri's code list), and swapping it in is a one-place change here.
+    """
+    raise NotImplementedError
diff --git a/tests/domain/abri/test_abandonment.py b/tests/domain/abri/test_abandonment.py
new file mode 100644
index 000000000..4c0cda5f1
--- /dev/null
+++ b/tests/domain/abri/test_abandonment.py
@@ -0,0 +1,20 @@
+from typing import Optional
+
+import pytest
+
+from domain.abri.abandonment import abandon_reason_for_outcome
+from domain.abri.models import AbandonReason
+
+
+@pytest.mark.parametrize(
+    "outcome",
+    ["no answer", "cancelled", "no show", "tenant refusal", "not viable", None],
+)
+def test_every_outcome_currently_maps_to_the_carded_reason(
+    outcome: Optional[str],
+) -> None:
+    # Act
+    reason = abandon_reason_for_outcome(outcome)
+
+    # Assert
+    assert reason == AbandonReason.CARDED