diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/ConsultingActivities.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/ConsultingActivities.razor
index 8c39fe2..f4ddcaf 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/ConsultingActivities.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/ConsultingActivities.razor
@@ -98,16 +98,23 @@
     </TitleContent>
     <DialogContent>
         <MudForm @ref="form">
-            <MudSelect T="int" @bind-Value="activityForm.ClientId" Label="고객" Required="true" Variant="Variant.Outlined" FullWidth="true" Class="mb-4">
-                @foreach (var client in clients)
-                {
-                    <MudSelectItem Value="@client.Id">@GetClientDisplayName(client)</MudSelectItem>
-                }
-            </MudSelect>
+            <div class="mb-4">
+                <label class="mud-input-label mud-input-label-animated mud-input-label-outlined mb-1">고객</label>
+                <select class="mud-input mud-input-outlined mud-input-root mud-input-root-adorned-start"
+                        style="width: 100%; min-height: 56px; padding: 16px 14px;"
+                        value="@activityForm.ClientId"
+                        @onchange="e => activityForm.ClientId = int.TryParse(e.Value?.ToString(), out var clientId) ? clientId : 0">
+                    <option value="0">고객을 선택하세요.</option>
+                    @foreach (var client in clients)
+                    {
+                        <option value="@client.Id">@GetClientDisplayName(client)</option>
+                    }
+                </select>
+            </div>
             <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" Label="활동일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" Value="@(activityForm.ActivityDate?.ToString("yyyy-MM-dd HH:mm") ?? string.Empty)" />
             <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" />
+            <MudTextField T="string" Label="다음 팔로업일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Value="@(activityForm.NextFollowupDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
         </MudForm>
     </DialogContent>
     <DialogActions>
diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/Contracts.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/Contracts.razor
index 73a4864..349c1d7 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/Contracts.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/Contracts.razor
@@ -117,15 +117,23 @@ else
                     }
                 </div>
                 <MudForm @ref="form">
-                    <MudSelect T="int?" @bind-Value="contractForm.ClientId" Label="고객" Required="true" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" RequiredError="고객을 선택하세요." Disabled="@isEditMode">
-                        @foreach (var client in clients)
-                        {
-                            <MudSelectItem Value="@((int?)client.Id)">@GetClientDisplayName(client)</MudSelectItem>
-                        }
-                    </MudSelect>
+                    <div class="mb-3">
+                        <label class="mud-input-label mud-input-label-animated mud-input-label-outlined mb-1">고객</label>
+                        <select class="mud-input mud-input-outlined mud-input-root mud-input-root-adorned-start"
+                                style="width: 100%; min-height: 56px; padding: 16px 14px;"
+                                value="@(contractForm.ClientId?.ToString() ?? string.Empty)"
+                                disabled="@isEditMode"
+                                @onchange="e => contractForm.ClientId = int.TryParse(e.Value?.ToString(), out var clientId) ? clientId : null">
+                            <option value="">고객을 선택하세요.</option>
+                            @foreach (var client in clients)
+                            {
+                                <option value="@client.Id">@GetClientDisplayName(client)</option>
+                            }
+                        </select>
+                    </div>
                     <MudTextField T="string" @bind-Value="contractForm.ContractNumber" Label="계약번호" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Required="true" />
                     <CommonCodeSelect @bind-Value="contractForm.ServiceType" Group="CONTRACT_SERVICE_TYPE" Label="서비스 유형" Class="mb-3" Required="true" />
-                    <MudDatePicker @bind-Date="contractForm.StartDate" Label="계약 시작일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Required="true" />
+                    <MudTextField T="string" Label="계약 시작일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Required="true" Value="@(contractForm.StartDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
                     <MudNumericField T="decimal?" @bind-Value="contractForm.MonthlyFee" Label="월 수수료" Variant="Variant.Outlined" FullWidth="@true" Class="mb-4" />
                     
                     <div class="d-flex justify-end gap-2">
diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/RevenueTrackings.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/RevenueTrackings.razor
index 6047a53..6bec08e 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/RevenueTrackings.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/RevenueTrackings.razor
@@ -94,17 +94,24 @@
     </TitleContent>
     <DialogContent>
         <MudForm @ref="form">
-            <MudSelect T="int" @bind-Value="revenueForm.ClientId" Label="고객" Required="true" Variant="Variant.Outlined" FullWidth="true" Class="mb-4">
-                @foreach (var client in clients)
-                {
-                    <MudSelectItem Value="@client.Id">@GetClientDisplayName(client)</MudSelectItem>
-                }
-            </MudSelect>
+            <div class="mb-4">
+                <label class="mud-input-label mud-input-label-animated mud-input-label-outlined mb-1">고객</label>
+                <select class="mud-input mud-input-outlined mud-input-root mud-input-root-adorned-start"
+                        style="width: 100%; min-height: 56px; padding: 16px 14px;"
+                        value="@revenueForm.ClientId"
+                        @onchange="e => revenueForm.ClientId = int.TryParse(e.Value?.ToString(), out var clientId) ? clientId : 0">
+                    <option value="0">고객을 선택하세요.</option>
+                    @foreach (var client in clients)
+                    {
+                        <option value="@client.Id">@GetClientDisplayName(client)</option>
+                    }
+                </select>
+            </div>
             <MudTextField T="string" @bind-Value="revenueForm.InvoiceNumber" Label="청구번호" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" />
-            <MudDatePicker @bind-Date="revenueForm.InvoiceDate" Label="청구일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" />
+            <MudTextField T="string" Label="청구일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" Value="@(revenueForm.InvoiceDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
             <MudNumericField T="decimal" @bind-Value="revenueForm.Amount" Label="청구액" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Required="true" />
             <CommonCodeSelect @bind-Value="revenueForm.ServiceType" Group="REVENUE_SERVICE_TYPE" Label="서비스 유형" Class="mb-4" />
-            <MudDatePicker @bind-Date="revenueForm.DueDate" Label="납부예정일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" />
+            <MudTextField T="string" Label="납부예정일" Variant="Variant.Outlined" FullWidth="true" Class="mb-4" Value="@(revenueForm.DueDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
         </MudForm>
     </DialogContent>
     <DialogActions>
diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxFilingSchedules.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxFilingSchedules.razor
index 469139b..f66625b 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxFilingSchedules.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxFilingSchedules.razor
@@ -1,4 +1,4 @@
-@page "/tax-filing-schedules"
+@page "/admin/tax-filing-schedules"
 @rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.Domain.Entities
@@ -129,22 +129,22 @@ else
                     }
                 </div>
                 <MudForm @ref="form">
-                    <MudSelect T="int?"
-                               @bind-Value="scheduleForm.ClientId"
-                               Label="고객"
-                               Required="true"
-                               Variant="Variant.Outlined"
-                               FullWidth="@true"
-                               Class="mb-3"
-                               RequiredError="고객을 선택하세요."
-                               Disabled="@isEditMode">
-                        @foreach (var client in clients)
-                        {
-                            <MudSelectItem Value="@((int?)client.Id)">@GetClientDisplayName(client)</MudSelectItem>
-                        }
-                    </MudSelect>
+                    <div class="mb-3">
+                        <label class="mud-input-label mud-input-label-animated mud-input-label-outlined mb-1">고객</label>
+                        <select class="mud-input mud-input-outlined mud-input-root mud-input-root-adorned-start"
+                                style="width: 100%; min-height: 56px; padding: 16px 14px;"
+                                value="@(scheduleForm.ClientId?.ToString() ?? string.Empty)"
+                                disabled="@isEditMode"
+                                @onchange="e => scheduleForm.ClientId = int.TryParse(e.Value?.ToString(), out var clientId) ? clientId : null">
+                            <option value="">고객을 선택하세요.</option>
+                            @foreach (var client in clients)
+                            {
+                                <option value="@client.Id">@GetClientDisplayName(client)</option>
+                            }
+                        </select>
+                    </div>
                     <CommonCodeSelect @bind-Value="scheduleForm.FilingType" Group="FILING_TYPE" Label="신고 유형" Class="mb-3" Required="true" />
-                    <MudDatePicker @bind-Date="scheduleForm.DueDate" Label="마감일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Required="true" />
+                    <MudTextField T="string" Label="마감일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Required="true" Value="@(scheduleForm.DueDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
                     <MudNumericField T="int" @bind-Value="scheduleForm.FilingYear" Label="신고연도" Variant="Variant.Outlined" FullWidth="@true" Class="mb-4" Required="true" />
                     
                     <div class="d-flex justify-end gap-2">
diff --git a/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxProfiles.razor b/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxProfiles.razor
index f1c1ccd..3dffc9d 100644
--- a/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxProfiles.razor
+++ b/src/TaxBaik.Web.Client/Components/Admin/Pages/TaxProfiles.razor
@@ -1,4 +1,4 @@
-@page "/tax-profiles"
+@page "/admin/tax-profiles"
 @rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.WasmClient.Components.Admin.Shared
@@ -95,15 +95,23 @@ else
                     }
                 </div>
                 <MudForm @ref="form">
-                    <MudSelect T="int?" @bind-Value="profileForm.ClientId" Label="고객" Required="true" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" RequiredError="고객을 선택하세요." Disabled="@isEditMode">
-                        @foreach (var client in clients)
-                        {
-                            <MudSelectItem Value="@((int?)client.Id)">@GetClientDisplayName(client)</MudSelectItem>
-                        }
-                    </MudSelect>
+                    <div class="mb-3">
+                        <label class="mud-input-label mud-input-label-animated mud-input-label-outlined mb-1">고객</label>
+                        <select class="mud-input mud-input-outlined mud-input-root mud-input-root-adorned-start"
+                                style="width: 100%; min-height: 56px; padding: 16px 14px;"
+                                value="@(profileForm.ClientId?.ToString() ?? string.Empty)"
+                                disabled="@isEditMode"
+                                @onchange="e => profileForm.ClientId = int.TryParse(e.Value?.ToString(), out var clientId) ? clientId : null">
+                            <option value="">고객을 선택하세요.</option>
+                            @foreach (var client in clients)
+                            {
+                                <option value="@client.Id">@GetClientDisplayName(client)</option>
+                            }
+                        </select>
+                    </div>
                     <CommonCodeSelect @bind-Value="profileForm.BusinessType" Group="BUSINESS_TYPE" Label="사업 유형" Class="mb-3" Required="true" />
-                    <CommonCodeSelect @bind-Value="profileForm.TaxRiskLevel" Group="TAX_RISK_LEVEL" Label="위험도" Class="mb-3" />
-                    <MudDatePicker @bind-Date="profileForm.NextFilingDueDate" Label="다음 신고 예정일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" />
+                    <CommonCodeSelect @bind-Value="profileForm.TaxRiskLevel" Group="TAX_RISK_LEVEL" Label="위험도" Class="mb-3" Clearable="true" Placeholder="위험도를 선택하세요" />
+                    <MudTextField T="string" Label="다음 신고 예정일" Variant="Variant.Outlined" FullWidth="@true" Class="mb-3" Value="@(profileForm.NextFilingDueDate?.ToString("yyyy-MM-dd") ?? string.Empty)" />
                     <MudTextField T="string" @bind-Value="profileForm.SpecialNotes" Label="특수 사항" Variant="Variant.Outlined" FullWidth="@true" Lines="3" Class="mb-4" />
                     
                     <div class="d-flex justify-end gap-2">
@@ -306,4 +314,5 @@ else
         public DateTime? NextFilingDueDate { get; set; }
         public string? SpecialNotes { get; set; }
     }
+
 }