diff --git a/tests/test_litellm/proxy/common_utils/test_reset_budget_job.py b/tests/test_litellm/proxy/common_utils/test_reset_budget_job.py
index bc9926a314f..56c0efb41d2 100644
--- a/tests/test_litellm/proxy/common_utils/test_reset_budget_job.py
+++ b/tests/test_litellm/proxy/common_utils/test_reset_budget_job.py
@@ -3054,6 +3054,38 @@ def test_budget_cascade_carries_enduser_overage_when_rollover_enabled(
     } in enduser_writes
 
 
+def test_budget_cascade_carries_default_tier_enduser_counter_when_rollover_enabled(
+    rollover_enabled, reset_budget_job, mock_prisma_client, monkeypatch
+):
+    """An end user on the default budget (no budget_id on its row) 5 over the cap
+    keeps a counter of 5 in the next window and loses its cached object."""
+    import litellm
+
+    counter_cache: Final = _make_counter_invalidation_job(monkeypatch)
+    monkeypatch.setattr(litellm, "max_end_user_budget_id", "default-enduser-budget")
+    mock_prisma_client.data["budget"] = [
+        _budget_row(budget_id="default-enduser-budget", budget_duration="1d", max_budget=10.0)
+    ]
+    implicit_enduser: Final = type(
+        "EndUserRow",
+        (),
+        {
+            "spend": 15.0,
+            "user_id": "enduser-implicit",
+            "budget_id": None,
+            "model_dump": lambda self=None: {"spend": 15.0, "user_id": "enduser-implicit", "budget_id": None, "blocked": False},
+        },
+    )
+    mock_prisma_client.db.litellm_endusertable.set_find_many_results([implicit_enduser])
+
+    asyncio.run(reset_budget_job.reset_budget_for_litellm_budget_table())
+
+    counter_cache.in_memory_cache.set_cache.assert_any_call(key="spend:end_user:enduser-implicit", value=5.0, ttl=60)
+    counter_cache.redis_cache.async_set_cache.assert_any_await(key="spend:end_user:enduser-implicit", value=5.0, ttl=60)
+    deleted: Final = {call.kwargs.get("key") for call in counter_cache.user_api_key_cache.async_delete_cache.await_args_list}
+    assert "end_user_id:enduser-implicit" in deleted
+
+
 def _replay_spend_writes(writes, spend):
     """Apply the queued update_many statements in order, the way the DB
     transaction executes them, and return the row's final spend."""