diff --git a/TaxBaik.Application.Tests/BusinessDayCalculatorTests.cs b/TaxBaik.Application.Tests/BusinessDayCalculatorTests.cs
index 14ac179..712acee 100644
--- a/TaxBaik.Application.Tests/BusinessDayCalculatorTests.cs
+++ b/TaxBaik.Application.Tests/BusinessDayCalculatorTests.cs
@@ -10,6 +10,7 @@ public class BusinessDayCalculatorTests
     [InlineData(2026, 8, 15, 2026, 8, 20)]
     [InlineData(2026, 9, 24, 2026, 9, 29)]
     [InlineData(2026, 10, 3, 2026, 10, 8)]
+    [InlineData(2027, 2, 6, 2027, 2, 10)]
     public void GetEffectiveDueDate_SkipsWeekendHolidayAndSubstituteHoliday(
         int dueYear, int dueMonth, int dueDay,
         int expectedYear, int expectedMonth, int expectedDay)
diff --git a/TaxBaik.Web/Components/Admin/Pages/Announcements/AnnouncementEdit.razor b/TaxBaik.Web/Components/Admin/Pages/Announcements/AnnouncementEdit.razor
index 319dece..a97cb9b 100644
--- a/TaxBaik.Web/Components/Admin/Pages/Announcements/AnnouncementEdit.razor
+++ b/TaxBaik.Web/Components/Admin/Pages/Announcements/AnnouncementEdit.razor
@@ -3,6 +3,7 @@
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.Web.Services
+@using TaxBaik.Web.Components.Admin.Shared
 @inject IAnnouncementBrowserClient AnnouncementClient
 @inject NavigationManager Navigation
 @inject ISnackbar Snackbar
@@ -37,13 +38,10 @@
             </MudItem>
 
             <MudItem xs="12" sm="6">
-                <MudSelect @bind-Value="model.DisplayType"
-                           Label="유형"
-                           Variant="Variant.Outlined">
-                    <MudSelectItem Value="@("info")">일반 (파란색)</MudSelectItem>
-                    <MudSelectItem Value="@("banner")">배너 (주황색) — 중요 이벤트</MudSelectItem>
-                    <MudSelectItem Value="@("urgent")">긴급 (빨간색) — 마감 임박</MudSelectItem>
-                </MudSelect>
+                <CommonCodeSelect @bind-Value="model.DisplayType"
+                                  Group="ANNOUNCEMENT_DISPLAY_TYPE"
+                                  Label="유형"
+                                  Class="mb-0" />
             </MudItem>
 
             <MudItem xs="12" sm="6">
diff --git a/TaxBaik.Web/Components/Admin/Pages/Clients/ClientDetail.razor b/TaxBaik.Web/Components/Admin/Pages/Clients/ClientDetail.razor
index 7b31648..95c1612 100644
--- a/TaxBaik.Web/Components/Admin/Pages/Clients/ClientDetail.razor
+++ b/TaxBaik.Web/Components/Admin/Pages/Clients/ClientDetail.razor
@@ -2,6 +2,7 @@
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Web.Services.AdminClients
+@using TaxBaik.Web.Components.Admin.Shared
 @inject IClientBrowserClient ClientClient
 @inject IConsultingActivityBrowserClient ConsultingClient
 @inject NavigationManager Navigation
@@ -103,12 +104,7 @@
                             <MudDatePicker @bind-Date="newDate" Label="상담일" DateFormat="yyyy-MM-dd" />
                         </MudItem>
                         <MudItem xs="12" sm="6">
-                        <MudSelect T="string" @bind-Value="newServiceType" Label="서비스 분야">
-                                @foreach (var t in serviceTypes)
-                                {
-                                    <MudSelectItem Value="@t">@t</MudSelectItem>
-                                }
-                            </MudSelect>
+                        <CommonCodeSelect @bind-Value="newServiceType" Group="CONSULTING_ACTIVITY_TYPE" Label="서비스 분야" Placeholder="선택" Clearable="true" />
                         </MudItem>
                         <MudItem xs="12">
                             <MudTextField T="string" @bind-Value="newSummary" Label="상담 내용 *"
@@ -183,7 +179,6 @@
 
     private Domain.Entities.Client? client;
     private List<Domain.Entities.Consultation> consultations = [];
-    private static readonly string[] serviceTypes = ["기장대리", "세무조정", "양도세", "증여세", "상속세", "부가세", "종소세", "기타"];
     private static readonly string[] results = ["", "상담완료", "추가자료 요청", "견적발송", "계약전환", "보류"];
 
     private bool showAddForm;
diff --git a/TaxBaik.Web/Components/Admin/Pages/Clients/ClientList.razor b/TaxBaik.Web/Components/Admin/Pages/Clients/ClientList.razor
index 6b68762..ea4b39d 100644
--- a/TaxBaik.Web/Components/Admin/Pages/Clients/ClientList.razor
+++ b/TaxBaik.Web/Components/Admin/Pages/Clients/ClientList.razor
@@ -28,11 +28,7 @@
                           Immediate="false" OnKeyUp="@OnSearchKeyUp" />
         </MudItem>
         <MudItem xs="12" md="3">
-            <MudSelect @bind-Value="statusFilter" Label="상태" T="string">
-                <MudSelectItem Value="@("")">전체</MudSelectItem>
-                <MudSelectItem Value="@("active")">활성</MudSelectItem>
-                <MudSelectItem Value="@("inactive")">비활성</MudSelectItem>
-            </MudSelect>
+            <CommonCodeSelect @bind-Value="statusFilter" Group="CLIENT_STATUS" Label="상태" Placeholder="전체" Clearable="true" />
         </MudItem>
         <MudItem xs="12" md="2" Class="d-flex align-center">
             <MudButton Variant="Variant.Outlined" OnClick="@SearchAsync" FullWidth="true">검색</MudButton>
diff --git a/TaxBaik.Web/Components/Admin/Pages/ConsultingActivities.razor b/TaxBaik.Web/Components/Admin/Pages/ConsultingActivities.razor
index bb5cb62..f74dcfd 100644
--- a/TaxBaik.Web/Components/Admin/Pages/ConsultingActivities.razor
+++ b/TaxBaik.Web/Components/Admin/Pages/ConsultingActivities.razor
@@ -1,5 +1,6 @@
 @page "/admin/consulting-activities"
 @using TaxBaik.Web.Services.AdminClients
+@using TaxBaik.Web.Components.Admin.Shared
 @inject IConsultingActivityBrowserClient ActivityClient
 @inject IClientBrowserClient ClientClient
 @inject ISnackbar Snackbar
@@ -103,14 +104,7 @@
                     <MudSelectItem Value="@client.Id">@GetClientDisplayName(client)</MudSelectItem>
                 }
             </MudSelect>
-            <MudSelect T="string" @bind-Value="activityForm.ActivityType" Label="활동 유형" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true">
-                <MudSelectItem Value="@("방문 상담")">방문 상담</MudSelectItem>
-                <MudSelectItem Value="@("전화 상담")">전화 상담</MudSelectItem>
-                <MudSelectItem Value="@("세무조사 대응 미팅")">세무조사 대응 미팅</MudSelectItem>
-                <MudSelectItem Value="@("카카오톡 상담")">카카오톡 상담</MudSelectItem>
-                <MudSelectItem Value="@("이메일 자료 접수")">이메일 자료 접수</MudSelectItem>
-                <MudSelectItem Value="@("기타")">기타</MudSelectItem>
-            </MudSelect>
+            <CommonCodeSelect @bind-Value="activityForm.ActivityType" Group="CONSULTING_ACTIVITY_TYPE" Label="활동 유형" Class="mb-4" Required="true" />
             <MudDatePicker @bind-Date="activityForm.ActivityDate" Label="활동일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" />
             <MudTextField T="string" @bind-Value="activityForm.Description" Label="설명" Variant="Variant.Outlined" FullWidth="true" Lines="3" Class="mb-4" Required="true" />
             <MudDatePicker @bind-Date="activityForm.NextFollowupDate" Label="다음 팔로업일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" />
diff --git a/TaxBaik.Web/Components/Admin/Shared/BusinessDayCalculator.cs b/TaxBaik.Web/Components/Admin/Shared/BusinessDayCalculator.cs
index 087c9c7..07b508c 100644
--- a/TaxBaik.Web/Components/Admin/Shared/BusinessDayCalculator.cs
+++ b/TaxBaik.Web/Components/Admin/Shared/BusinessDayCalculator.cs
@@ -24,7 +24,18 @@ public static class BusinessDayCalculator
         new(new DateOnly(2026, 9, 24), new DateOnly(2026, 9, 26)),
         new(new DateOnly(2026, 10, 3), new DateOnly(2026, 10, 5)),
         new(new DateOnly(2026, 10, 9), new DateOnly(2026, 10, 9)),
-        new(new DateOnly(2026, 12, 25), new DateOnly(2026, 12, 25))
+        new(new DateOnly(2026, 12, 25), new DateOnly(2026, 12, 25)),
+        new(new DateOnly(2027, 1, 1), new DateOnly(2027, 1, 1)),
+        new(new DateOnly(2027, 2, 6), new DateOnly(2027, 2, 9)),
+        new(new DateOnly(2027, 3, 1), new DateOnly(2027, 3, 2)),
+        new(new DateOnly(2027, 5, 5), new DateOnly(2027, 5, 5)),
+        new(new DateOnly(2027, 5, 13), new DateOnly(2027, 5, 13)),
+        new(new DateOnly(2027, 6, 6), new DateOnly(2027, 6, 6)),
+        new(new DateOnly(2027, 8, 15), new DateOnly(2027, 8, 16)),
+        new(new DateOnly(2027, 9, 14), new DateOnly(2027, 9, 16)),
+        new(new DateOnly(2027, 10, 3), new DateOnly(2027, 10, 4)),
+        new(new DateOnly(2027, 10, 9), new DateOnly(2027, 10, 11)),
+        new(new DateOnly(2027, 12, 25), new DateOnly(2027, 12, 26))
     };
 
     private static readonly HashSet<DateOnly> HolidayDates = BuildHolidayDates();
diff --git a/db/migrations/V030__SeedConsultingAndAnnouncementCommonCodes.sql b/db/migrations/V030__SeedConsultingAndAnnouncementCommonCodes.sql
new file mode 100644
index 0000000..8a8d76a
--- /dev/null
+++ b/db/migrations/V030__SeedConsultingAndAnnouncementCommonCodes.sql
@@ -0,0 +1,16 @@
+-- Additional common codes for admin combo policy normalization.
+INSERT INTO common_codes (code_group, code_value, code_name, sort_order) VALUES
+('CONSULTING_ACTIVITY_TYPE', '방문상담', '방문 상담', 10),
+('CONSULTING_ACTIVITY_TYPE', '전화상담', '전화 상담', 20),
+('CONSULTING_ACTIVITY_TYPE', '세무조사대응미팅', '세무조사 대응 미팅', 30),
+('CONSULTING_ACTIVITY_TYPE', '카카오톡상담', '카카오톡 상담', 40),
+('CONSULTING_ACTIVITY_TYPE', '이메일자료접수', '이메일 자료 접수', 50),
+('CONSULTING_ACTIVITY_TYPE', '기타', '기타', 60),
+
+('ANNOUNCEMENT_DISPLAY_TYPE', 'info', '일반', 10),
+('ANNOUNCEMENT_DISPLAY_TYPE', 'banner', '배너', 20),
+('ANNOUNCEMENT_DISPLAY_TYPE', 'urgent', '긴급', 30)
+ON CONFLICT (code_group, code_value) DO UPDATE
+SET code_name = EXCLUDED.code_name,
+    sort_order = EXCLUDED.sort_order,
+    is_active = TRUE;
diff --git a/docs/COMMON_CODE_POLICY.md b/docs/COMMON_CODE_POLICY.md
index 22619f3..ac992ce 100644
--- a/docs/COMMON_CODE_POLICY.md
+++ b/docs/COMMON_CODE_POLICY.md
@@ -22,6 +22,8 @@
 
 - `INQUIRY_SERVICE_TYPE`
 - `INQUIRY_STATUS`
+- `CONSULTING_ACTIVITY_TYPE`
+- `ANNOUNCEMENT_DISPLAY_TYPE`
 - `CLIENT_STATUS`
 - `CLIENT_SERVICE_TYPE`
 - `CLIENT_TAX_TYPE`