diff --git a/B09_Estimation/B09_Estimation_Engine_Cost.py b/B09_Estimation/B09_Estimation_Engine_Cost.py
index d3b7ec0e..765914d1 100644
--- a/B09_Estimation/B09_Estimation_Engine_Cost.py
+++ b/B09_Estimation/B09_Estimation_Engine_Cost.py
@@ -130,13 +130,19 @@ class CostLine:
 
         실무 원문은 안전관리비 A 식을 B 줄에 복사해 둔 오류가 있었다(PLAN 8-13).
         """
-        if self.rate_percent is None:
+        if self.rate_percent is None or self.key == "safety_management_cost":
+            # 채택 요약 줄은 요율을 다시 붙이지 않는다 — 산식은 A·B 줄에 이미 있다.
             return self.base_label
-        text = f"{self.base_label} × {self.rate_percent}%"
+        # 밑수가 합·차로 이루어졌으면 괄호를 씌운다.
+        # 안 씌우면 「(순공사원가+일반관리비) − 재료비 × 15%」처럼 곱하는 대상이 뒤바뀌어 읽힌다.
+        base = self.base_label
+        if any(mark in base for mark in ("+", "−", "×")):
+            base = f"({base})"
+        text = f"{base} × {self.rate_percent}%"
         if self.flat_amount_krw:
             text += f" + {self.flat_amount_krw:,.0f}"
         if self.key == "safety_management_cost_b":
-            text = f"({text}) × 1.2"
+            text = f"[{text}] × 1.2"
         return text
 
 
@@ -211,7 +217,7 @@ def _scale_signature(dataset: RateDataset, amount: Decimal) -> tuple:
     규모(추정가격)로 갈리는 요율만 모은다. 지문이 같으면 더 돌 필요가 없다.
     """
     parts: list[str] = []
-    for variable, field, key in (
+    for variable, bracket_field, key in (
         ("rate_overhead", "estimated_price_bracket", "civil_landscape_industrial"),
         ("rate_profit", "estimated_price_bracket", "brackets"),
         ("rate_goyong", "estimated_amount_bracket", "brackets"),
@@ -223,7 +229,7 @@ def _scale_signature(dataset: RateDataset, amount: Decimal) -> tuple:
         try:
             row = select_bracket(
                 rows,
-                amount_field=field,
+                amount_field=bracket_field,
                 amount=amount,
                 residual_label="below_official_threshold",
                 label=variable,
@@ -231,7 +237,7 @@ def _scale_signature(dataset: RateDataset, amount: Decimal) -> tuple:
         except Exception:  # noqa: BLE001 - 구간 밖이면 지문에서 뺀다
             parts.append(f"{variable}:none")
             continue
-        parts.append(f"{variable}:{row.get(field)}")
+        parts.append(f"{variable}:{row.get(bracket_field)}")
 
     # 적용 하한(추정금액 1억 이상 등)도 구간과 같은 축이다.
     for variable in ("rate_environment", "rate_retirement_mutual_aid"):
diff --git a/B09_Estimation/B09_Estimation_Statutory.py b/B09_Estimation/B09_Estimation_Statutory.py
index a4f710ad..db4f9f52 100644
--- a/B09_Estimation/B09_Estimation_Statutory.py
+++ b/B09_Estimation/B09_Estimation_Statutory.py
@@ -217,7 +217,7 @@ def safety_management_cost(
     amount_b = emit(
         key="safety_management_cost_b",
         name="산업안전보건관리비 B(관급 제외 × 1.2)",
-        base_label="(재료비+직접노무비) × 요율 + 기초액, 그 값의 1.2배",
+        base_label="재료비+직접노무비 (관급 제외)",
         base=base_without,
         percent=percent_b,
         flat=flat_b,
diff --git a/ui_template/ui_template_locale_common.ts b/ui_template/ui_template_locale_common.ts
index dde3aa13..11eb7dfc 100644
--- a/ui_template/ui_template_locale_common.ts
+++ b/ui_template/ui_template_locale_common.ts
@@ -82,7 +82,7 @@ export const ui_locales_common = {
   WF_Step_ProfileCross: ["횡단설계", "Cross Design"],
   WF_Step_DesignDetail: ["상세설계", "Detail Design"],
   WF_Step_Quantity: ["수량산출", "Quantity"],
-  WF_Step_Estimation: ["설계도서", "Design Docs"],
+  WF_Step_Estimation: ["원가계산", "Cost Estimate"],
   WF_State_Stale: ["무효화됨 (하위 단계 변경)", "Stale (invalidated by downstream changes)"],
   WF_State_Failed: ["실패", "Failed"],
   WF_State_Complete: ["완료", "Complete"],