diff --git a/src/benchflow/rollout/_deadline.py b/src/benchflow/rollout/_deadline.py
index 397646e08..d6a8d58af 100644
--- a/src/benchflow/rollout/_deadline.py
+++ b/src/benchflow/rollout/_deadline.py
@@ -80,11 +80,15 @@ def _computed_deadline_sec(cfg: RolloutConfig) -> float:
     ``timeout_sec`` overrides, user-loop rounds (each round runs one prompt
     plus a soft verify), and :func:`effective_install_timeout` — the single
     source of truth for the install budget — per distinct agent.
+
+    Task budgets are read after the run's ``config_override`` is merged in, as
+    ``Rollout.setup()`` does, so a budget the run raises raises the backstop.
     """
+    from benchflow._utils.config_override import apply_config_override
     from benchflow.agents.install import effective_install_timeout
     from benchflow.task import Task
 
-    tcfg = Task(cfg.task_path).config
+    tcfg = apply_config_override(Task(cfg.task_path).config, cfg.config_override)
     agent_default = float(cfg.timeout or tcfg.agent.timeout_sec or 900.0)
     verifier_sec = float(tcfg.verifier.timeout_sec or 900.0)
     build_sec = float(tcfg.sandbox.build_timeout_sec or 600.0)
diff --git a/tests/test_rollout_hard_deadline.py b/tests/test_rollout_hard_deadline.py
index 9ef1c3358..894688256 100644
--- a/tests/test_rollout_hard_deadline.py
+++ b/tests/test_rollout_hard_deadline.py
@@ -82,6 +82,35 @@ def test_caller_timeout_override_dominates_task_budget(self, tmp_path, monkeypat
         assert base is not None and raised is not None
         assert raised >= base + 7200 - 60
 
+    @pytest.mark.parametrize(
+        ("overlay", "added_sec"),
+        [
+            ({"agent": {"timeout_sec": 7200}}, 7200 - 60),
+            ({"sandbox": {"build_timeout_sec": 1800}}, 1800 - 600),
+        ],
+        ids=["agent-timeout", "build-timeout"],
+    )
+    def test_config_override_budgets_dominate_task_budget(
+        self, tmp_path, monkeypatch, overlay, added_sec
+    ):
+        """A run's ``config_override`` (``--config-override``) is merged into
+        the task config in ``Rollout.setup()``, so the raised budget is the one
+        the phase enforces; the backstop must be derived from it as well.
+
+        Guards the fix from PR #1161 for #1134: the deadline from #949 re-read the task
+        budgets without the override introduced in 0a645223, and killed runs
+        that were still inside their raised budget.
+        """
+        monkeypatch.delenv("BENCHFLOW_ROLLOUT_HARD_DEADLINE", raising=False)
+        _write_task(tmp_path / "t")
+        base = hard_deadline_sec(RolloutConfig(task_path=tmp_path / "t"))
+        raised = hard_deadline_sec(
+            RolloutConfig(task_path=tmp_path / "t", config_override=overlay)
+        )
+        assert base is not None
+        # Exact, so the unreadable-task fallback cannot pass for the result.
+        assert raised == base + added_sec
+
     def test_user_loop_rounds_dominate(self, tmp_path, monkeypatch):
         """A user-loop run legitimately spends max_user_rounds x (agent +
         soft-verify); the backstop must cover it, not fire mid-loop."""