diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index 082552c58e1..a5a9e997677 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -7282,6 +7282,7 @@ class ProxyUpdateSpend:
         start_time: Final = time.time()
         try:
             for i in range(n_retry_times + 1):
+                external_post_attempted = False
                 try:
                     base_url = os.getenv("SPEND_LOGS_URL", None)
                     if len(logs_to_process) > 0 and base_url is not None and db_writer_client is not None:
@@ -7294,6 +7295,7 @@ class ProxyUpdateSpend:
                             # No external request has been sent. The batch is safe to replay.
                             await requeue_spend_logs(prisma_client, proxy_logging_obj, logs_to_process)
                             raise
+                        external_post_attempted = True
                         response = await db_writer_client.post(
                             url=base_url + "spend/update",
                             data=json_data,
@@ -7336,6 +7338,10 @@ class ProxyUpdateSpend:
                         )
                     break
                 except Exception as e:
+                    if external_post_attempted:
+                        # Even a transport error can arrive after the remote writer
+                        # committed. Retrying or requeueing could duplicate spend.
+                        raise
                     if not _is_transient_spend_log_write_error(e):
                         if PrismaDBExceptionHandler.is_prisma_error(e):
                             await requeue_spend_logs(prisma_client, proxy_logging_obj, logs_to_process)
diff --git a/tests/test_litellm/proxy/utils/prisma_and_spend/test_proxy_update_spend.py b/tests/test_litellm/proxy/utils/prisma_and_spend/test_proxy_update_spend.py
index 89afe852427..9e1ec346b51 100644
--- a/tests/test_litellm/proxy/utils/prisma_and_spend/test_proxy_update_spend.py
+++ b/tests/test_litellm/proxy/utils/prisma_and_spend/test_proxy_update_spend.py
@@ -991,3 +991,23 @@ async def test_external_spend_log_post_error_is_not_replayed(
         )
     writer.post.assert_awaited_once()
     assert mock_prisma_client.spend_log_transactions == []
+
+
+@pytest.mark.asyncio
+async def test_external_spend_log_transport_error_is_not_retried_or_requeued(
+    mock_prisma_client: Any, make_spend_log_row: Any, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    import httpx
+
+    monkeypatch.setenv("SPEND_LOGS_URL", "http://writer.invalid")
+    writer = MagicMock()
+    writer.post = AsyncMock(side_effect=httpx.ReadError("response lost after send"))
+    proxy_logging = MagicMock()
+    proxy_logging.failure_handler = AsyncMock()
+    with pytest.raises(httpx.ReadError):
+        await ProxyUpdateSpend.update_spend_logs(
+            n_retry_times=2, prisma_client=mock_prisma_client, db_writer_client=writer,
+            proxy_logging_obj=proxy_logging, logs_to_process=[make_spend_log_row(request_id="maybe-committed")],
+        )
+    writer.post.assert_awaited_once()
+    assert mock_prisma_client.spend_log_transactions == []