diff --git a/.github/workflows/sync-cloud-run-env.yml b/.github/workflows/sync-cloud-run-env.yml
index e75d467..eb51220 100644
--- a/.github/workflows/sync-cloud-run-env.yml
+++ b/.github/workflows/sync-cloud-run-env.yml
@@ -157,6 +157,7 @@ jobs:
       INCOME_THRESHOLD_USD: ${{ vars.INCOME_THRESHOLD_USD }}
       QQQI_INCOME_RATIO: ${{ vars.QQQI_INCOME_RATIO }}
       INCOME_LAYER_ENABLED: ${{ vars.INCOME_LAYER_ENABLED }}
+      INCOME_LAYER_START_USD: ${{ vars.INCOME_LAYER_START_USD }}
       INCOME_LAYER_MAX_RATIO: ${{ vars.INCOME_LAYER_MAX_RATIO }}
       RUNTIME_TARGET_ENABLED: ${{ vars.RUNTIME_TARGET_ENABLED }}
       NOTIFY_LANG: ${{ vars.NOTIFY_LANG }}
@@ -942,6 +943,12 @@ jobs:
             remove_env_vars+=("INCOME_LAYER_ENABLED")
           fi
 
+          if [ -n "${INCOME_LAYER_START_USD:-}" ]; then
+            env_pairs+=("INCOME_LAYER_START_USD=${INCOME_LAYER_START_USD}")
+          else
+            remove_env_vars+=("INCOME_LAYER_START_USD")
+          fi
+
           if [ -n "${INCOME_LAYER_MAX_RATIO:-}" ]; then
             env_pairs+=("INCOME_LAYER_MAX_RATIO=${INCOME_LAYER_MAX_RATIO}")
           else
diff --git a/runtime_config_support.py b/runtime_config_support.py
index c77927b..67e165a 100644
--- a/runtime_config_support.py
+++ b/runtime_config_support.py
@@ -100,6 +100,7 @@ class PlatformRuntimeSettings:
     income_threshold_usd: float | None = None
     qqqi_income_ratio: float | None = None
     income_layer_enabled: bool | None = None
+    income_layer_start_usd: float | None = None
     income_layer_max_ratio: float | None = None
     runtime_execution_window_trading_days: int | None = None
     feature_snapshot_path: str | None = None
@@ -288,6 +289,7 @@ def load_platform_runtime_settings(
         income_threshold_usd=resolve_optional_float_env(os.environ, "INCOME_THRESHOLD_USD"),
         qqqi_income_ratio=_qqqi_income_ratio_env(),
         income_layer_enabled=_optional_bool_env("INCOME_LAYER_ENABLED"),
+        income_layer_start_usd=_optional_non_negative_float_env("INCOME_LAYER_START_USD"),
         income_layer_max_ratio=_optional_ratio_env("INCOME_LAYER_MAX_RATIO"),
         runtime_execution_window_trading_days=_runtime_execution_window_trading_days_env(
             strategy_definition.profile
@@ -400,6 +402,17 @@ def _optional_ratio_env(name: str) -> float | None:
     return value
 
 
+def _optional_non_negative_float_env(name: str) -> float | None:
+    value = resolve_optional_float_env(os.environ, name)
+    if value is None:
+        return None
+    if not math.isfinite(value):
+        raise ValueError(f"{name} must be finite, got {value}")
+    if value < 0:
+        raise ValueError(f"{name} must be non-negative, got {value}")
+    return float(value)
+
+
 def _resolve_non_negative_float_env(name: str, *, default: float) -> float:
     value = resolve_optional_float_env(os.environ, name)
     if value is None:
diff --git a/strategy_runtime.py b/strategy_runtime.py
index 39bb2ab..1065efa 100644
--- a/strategy_runtime.py
+++ b/strategy_runtime.py
@@ -167,9 +167,12 @@ def _default_runtime_settings(profile: str, display_name: str) -> PlatformRuntim
 def _build_runtime_overrides(profile: str, runtime_settings: PlatformRuntimeSettings) -> dict[str, Any]:
     overrides: dict[str, Any] = {}
     income_layer_enabled = getattr(runtime_settings, "income_layer_enabled", None)
+    income_layer_start_usd = getattr(runtime_settings, "income_layer_start_usd", None)
     income_layer_max_ratio = getattr(runtime_settings, "income_layer_max_ratio", None)
     if income_layer_enabled is not None:
         overrides["income_layer_enabled"] = income_layer_enabled
+    if income_layer_start_usd is not None:
+        overrides["income_layer_start_usd"] = income_layer_start_usd
     if income_layer_max_ratio is not None:
         overrides["income_layer_max_ratio"] = income_layer_max_ratio
     if profile == "tqqq_growth_income":
diff --git a/tests/test_runtime_config_support.py b/tests/test_runtime_config_support.py
index 3874fae..7f61f8b 100644
--- a/tests/test_runtime_config_support.py
+++ b/tests/test_runtime_config_support.py
@@ -482,6 +482,7 @@ def test_income_layer_overrides_are_loaded_from_env(self):
                 "INCOME_THRESHOLD_USD": "100000",
                 "QQQI_INCOME_RATIO": "0.5",
                 "INCOME_LAYER_ENABLED": "false",
+                "INCOME_LAYER_START_USD": "250000",
                 "INCOME_LAYER_MAX_RATIO": "0.25",
             },
             clear=True,
@@ -492,6 +493,7 @@ def test_income_layer_overrides_are_loaded_from_env(self):
         self.assertEqual(settings.income_threshold_usd, 100000.0)
         self.assertEqual(settings.qqqi_income_ratio, 0.5)
         self.assertFalse(settings.income_layer_enabled)
+        self.assertEqual(settings.income_layer_start_usd, 250000.0)
         self.assertEqual(settings.income_layer_max_ratio, 0.25)
 
     def test_tech_runtime_execution_window_override_rejects_research_only_profile(self):
@@ -532,6 +534,18 @@ def test_rejects_invalid_income_layer_max_ratio(self):
             with self.assertRaisesRegex(ValueError, "INCOME_LAYER_MAX_RATIO"):
                 load_platform_runtime_settings(project_id_resolver=lambda: "project-1")
 
+    def test_rejects_invalid_income_layer_start_usd(self):
+        with patch.dict(
+            os.environ,
+            {
+                "RUNTIME_TARGET_JSON": runtime_target_json("tqqq_growth_income"),
+                "INCOME_LAYER_START_USD": "-1",
+            },
+            clear=True,
+        ):
+            with self.assertRaisesRegex(ValueError, "INCOME_LAYER_START_USD"):
+                load_platform_runtime_settings(project_id_resolver=lambda: "project-1")
+
     def test_rejects_human_readable_alias(self):
         with patch.dict(
             os.environ,
diff --git a/tests/test_strategy_runtime.py b/tests/test_strategy_runtime.py
index 77e892f..9c64c44 100644
--- a/tests/test_strategy_runtime.py
+++ b/tests/test_strategy_runtime.py
@@ -101,6 +101,7 @@ def _build_runtime_settings(
     income_threshold_usd: float | None = None,
     qqqi_income_ratio: float | None = None,
     income_layer_enabled: bool | None = None,
+    income_layer_start_usd: float | None = None,
     income_layer_max_ratio: float | None = None,
     runtime_execution_window_trading_days: int | None = None,
 ) -> PlatformRuntimeSettings:
@@ -121,6 +122,7 @@ def _build_runtime_settings(
         income_threshold_usd=income_threshold_usd,
         qqqi_income_ratio=qqqi_income_ratio,
         income_layer_enabled=income_layer_enabled,
+        income_layer_start_usd=income_layer_start_usd,
         income_layer_max_ratio=income_layer_max_ratio,
         runtime_execution_window_trading_days=runtime_execution_window_trading_days,
         feature_snapshot_path=feature_snapshot_path,
@@ -262,6 +264,7 @@ def test_load_strategy_runtime_applies_tqqq_income_overrides_from_settings(self)
                         income_threshold_usd=100000.0,
                         qqqi_income_ratio=0.5,
                         income_layer_enabled=False,
+                        income_layer_start_usd=250000.0,
                         income_layer_max_ratio=0.25,
                     ),
                 )
@@ -269,10 +272,12 @@ def test_load_strategy_runtime_applies_tqqq_income_overrides_from_settings(self)
         self.assertEqual(runtime.runtime_overrides["income_threshold_usd"], 100000.0)
         self.assertEqual(runtime.runtime_overrides["qqqi_income_ratio"], 0.5)
         self.assertFalse(runtime.runtime_overrides["income_layer_enabled"])
+        self.assertEqual(runtime.runtime_overrides["income_layer_start_usd"], 250000.0)
         self.assertEqual(runtime.runtime_overrides["income_layer_max_ratio"], 0.25)
         self.assertEqual(runtime.merged_runtime_config["income_threshold_usd"], 100000.0)
         self.assertEqual(runtime.merged_runtime_config["qqqi_income_ratio"], 0.5)
         self.assertFalse(runtime.merged_runtime_config["income_layer_enabled"])
+        self.assertEqual(runtime.merged_runtime_config["income_layer_start_usd"], 250000.0)
         self.assertEqual(runtime.merged_runtime_config["income_layer_max_ratio"], 0.25)
 
     def test_load_strategy_runtime_applies_tech_execution_window_overrides_from_settings(self):
diff --git a/tests/test_sync_cloud_run_env_workflow.sh b/tests/test_sync_cloud_run_env_workflow.sh
index 3c79f67..9e050fe 100644
--- a/tests/test_sync_cloud_run_env_workflow.sh
+++ b/tests/test_sync_cloud_run_env_workflow.sh
@@ -96,6 +96,7 @@ grep -Fq 'STRATEGY_PLUGIN_ALERT_TELEGRAM_CHAT_IDS: ${{ vars.STRATEGY_PLUGIN_ALER
 grep -Fq 'STRATEGY_PLUGIN_ALERT_TELEGRAM_BOT_TOKEN_SECRET_NAME: ${{ vars.STRATEGY_PLUGIN_ALERT_TELEGRAM_BOT_TOKEN_SECRET_NAME }}' "$workflow_file"
 grep -Fq 'INCOME_THRESHOLD_USD: ${{ vars.INCOME_THRESHOLD_USD }}' "$workflow_file"
 grep -Fq 'QQQI_INCOME_RATIO: ${{ vars.QQQI_INCOME_RATIO }}' "$workflow_file"
+grep -Fq 'INCOME_LAYER_START_USD: ${{ vars.INCOME_LAYER_START_USD }}' "$workflow_file"
 grep -Fq 'LONGBRIDGE_DRY_RUN_ONLY: ${{ vars.LONGBRIDGE_DRY_RUN_ONLY }}' "$workflow_file"
 grep -Fq 'RUNTIME_TARGET_JSON: ${{ vars.RUNTIME_TARGET_JSON }}' "$workflow_file"
 grep -Fq 'ACCOUNT_REGION: ${{ vars.ACCOUNT_REGION || matrix.target.default_account_region }}' "$workflow_file"