diff --git a/Service/ServiceContracts/IAdminService.cs b/Service/ServiceContracts/IAdminService.cs
index c11ee79c9..89fe621ee 100644
--- a/Service/ServiceContracts/IAdminService.cs
+++ b/Service/ServiceContracts/IAdminService.cs
@@ -1,4 +1,5 @@
 using BS.Shared.Attributes;
+using BS.Shared.DataContracts.AdminService;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -23,7 +24,7 @@ namespace BeWo.Service.ServiceContracts
 		string Echo(string echo);
 
 		[OperationContract]
-		[WebInvoke(UriTemplate = "/GetGkvSum?start={start}&end={end}", Method = "POST", ResponseFormat = WebMessageFormat.Json)]
-		object GetGkvAbrechnungSumme(DateTime start, DateTime end);
+		[WebInvoke(UriTemplate = "/GetGkvSum", Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
+		object GetGkvAbrechnungSumme(AdminServiceSumReqDC request);
 	}
 }
diff --git a/Service/ServiceImplementations/AdminServiceImp.cs b/Service/ServiceImplementations/AdminServiceImp.cs
index e45869410..7173c2ae4 100644
--- a/Service/ServiceImplementations/AdminServiceImp.cs
+++ b/Service/ServiceImplementations/AdminServiceImp.cs
@@ -1,5 +1,6 @@
 using BeWo.Data.Access;
 using BeWo.Service.ServiceContracts;
+using BS.Shared.DataContracts.AdminService;
 using DevExpress.Pdf.Native.BouncyCastle.Ocsp;
 using System;
 using System.Collections.Generic;
@@ -23,19 +24,24 @@ namespace BeWo.Service.ServiceImplementations
 			return echo;
 		}
 
-		public object GetGkvAbrechnungSumme(DateTime start, DateTime end)
+		public object GetGkvAbrechnungSumme(AdminServiceSumReqDC request)
 		{
-			if(start == default(DateTime))
+			if (request == null)
 			{
-				return "Start darf nicht default(DateTime) sein";
+				throw new ArgumentException("Request darf nicht null sein");
 			}
 
-			if(end == default(DateTime))
+			if(request.Start == default)
 			{
-				return "End darf nicht default(DateTime) sein";
+				throw new ArgumentException("Start darf nicht default(DateTime) sein");
 			}
 
-			var sum = DAOFactory.ScriptDAO.GetGkvSumByDateRange(start, end);
+			if(request.End == default)
+			{
+				throw new ArgumentException("End darf nicht default(DateTime) sein");
+			}
+
+			var sum = DAOFactory.ScriptDAO.GetGkvSumByDateRange(request.Start, request.End);
 
 			if (sum is decimal s)
 			{
diff --git a/Shared/DataContracts/AdminService/AdminServiceSumReqDC.cs b/Shared/DataContracts/AdminService/AdminServiceSumReqDC.cs
new file mode 100644
index 000000000..553734372
--- /dev/null
+++ b/Shared/DataContracts/AdminService/AdminServiceSumReqDC.cs
@@ -0,0 +1,20 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BS.Shared.DataContracts.AdminService
+{
+	[DataContract]
+	public class AdminServiceSumReqDC : IAdminServiceDC
+	{
+		[DataMember(Name = "end")]
+		public DateTime End { get; set; }
+
+		[DataMember(Name = "start")]
+		public DateTime Start { get; set; }
+	}
+}
diff --git a/Shared/DataContracts/AdminService/IAdminServiceDC.cs b/Shared/DataContracts/AdminService/IAdminServiceDC.cs
new file mode 100644
index 000000000..a67146897
--- /dev/null
+++ b/Shared/DataContracts/AdminService/IAdminServiceDC.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BS.Shared.DataContracts.AdminService
+{
+	public interface IAdminServiceDC : IDataContract
+	{
+	}
+}
diff --git a/Shared/Shared.csproj b/Shared/Shared.csproj
index 0bb0b2395..4bff5217a 100644
--- a/Shared/Shared.csproj
+++ b/Shared/Shared.csproj
@@ -170,6 +170,8 @@
     <Compile Include="Core\ValidatorExtended.cs" />
     <Compile Include="Core\WohnheimbuchungsIntervall.cs" />
     <Compile Include="DataContracts\AbsenceOverviewFilterDC.cs" />
+    <Compile Include="DataContracts\AdminService\IAdminServiceDC.cs" />
+    <Compile Include="DataContracts\AdminService\AdminServiceSumReqDC.cs" />
     <Compile Include="DataContracts\AiSettingsDC.cs" />
     <Compile Include="DataContracts\AiChatDC.cs" />
     <Compile Include="DataContracts\AbwesenheitsInformationDC.cs" />