diff --git a/Elwig/Helpers/Billing/Transaction.cs b/Elwig/Helpers/Billing/Transaction.cs
new file mode 100644
index 0000000..0c79498
--- /dev/null
+++ b/Elwig/Helpers/Billing/Transaction.cs
@@ -0,0 +1,14 @@
+using Elwig.Models;
+
+namespace Elwig.Helpers.Billing {
+    public class Transaction {
+
+        public readonly Member Member;
+        public readonly int AmountCent;
+
+        public Transaction(Member m, decimal amount) {
+            Member = m;
+            AmountCent = (int)(amount * 100);
+        }
+    }
+}
diff --git a/Elwig/Helpers/Export/Bki.cs b/Elwig/Helpers/Export/Bki.cs
index fedea4a..e043bd1 100644
--- a/Elwig/Helpers/Export/Bki.cs
+++ b/Elwig/Helpers/Export/Bki.cs
@@ -1,4 +1,51 @@
+using Elwig.Models;
+using Microsoft.EntityFrameworkCore;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
 namespace Elwig.Helpers.Export {
-    public class Bki {
+    public class Bki : Csv<DeliveryPart> {
+
+        private readonly string _clientData;
+
+        public Bki(string filename) : base(filename, ';', Encoding.Latin1) {
+            Header = """
+                EDV-Liste zum automatischen Einlesen in die Weindatenbank;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+                ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+                Stammdaten;;;;;;;;;;;;;;Transportschein;;;;;;;;;;;;;;;;
+                Empfänger:;;;;;;;Versender:;;;;;;;;;;;;;;;;;;;;;;;
+                Betriebsnr;Name od. Firmenname;Vorname;Straße;Hausnr;Plz;Ort;Betriebsnr;Name od. Firmenname;Vorname;Straße;Hausnr;Plz;Ort;Datum der Lieferung;Menge in kg;Art;Weiß;Rot;Sorte1;Sorte2;Sorte3;Qualitätsstufe;Jahrgang;Herkunft;°KMW;°Oe;Vollablieferer;Ha Gesamt;Ha Ertragsfähig;Flächenbindung in Ha für AMA
+                """;
+            var c = App.Client;
+            var (a1, a2) = Utils.SplitAddress(c.Address);
+            _clientData = $"{c.LfbisNr};{c.NameFull};;{a1};{a2};{c.Plz};{c.Ort}";
+        }
+
+        public async Task ExportAsync(AppDbContext ctx, int year) {
+            await ExportAsync(await ctx.DeliveryParts.Where(p => p.Year == year).ToListAsync());
+        }
+
+        public void Export(AppDbContext ctx, int year) {
+            ExportAsync(ctx, year).GetAwaiter().GetResult();
+        }
+
+        public override string FormatRow(DeliveryPart p) {
+            var d = p.Delivery;
+            var m = d.Member;
+            string memberData;
+            if (m.BillingAddress is BillingAddr a) {
+                var (n1, n2) = Utils.SplitName(a.Name, m.FamilyName);
+                var (a1, a2) = Utils.SplitAddress(a.Address);
+                memberData = $"{m.LfbisNr};{n1};{n2};{a1};{a2};{a.PostalDest.AtPlz?.Plz};{a.PostalDest.AtPlz?.Ort.Name}";
+            } else {
+                var (a1, a2) = Utils.SplitAddress(m.Address);
+                memberData = $"{m.LfbisNr};{m.FamilyName};{m.AdministrativeName2};{a1};{a2};{m.PostalDest.AtPlz?.Plz};{m.PostalDest.AtPlz?.Ort.Name}";
+            }
+            var s = p.Variant;
+            var deliveryData = $"{d.Date:dd.MM.yyyy};{p.Weight};TB;{(s.IsWhite ? "J" : "")};{(s.IsRed ? "J" : "")};{s.SortId};;;{p.QualId};{d.Year};{p.HkId};{p.Kmw};{p.Oe}";
+            var vollData = $"N;;;{m.AreaCommitments.Where(a => a.YearFrom <= d.Year && (a.YearTo == null || a.YearTo >= d.Year)).Sum(a => a.Area) / 10_000.0}";
+            return $"{_clientData};{memberData};{deliveryData};{vollData}";
+        }
     }
 }
diff --git a/Elwig/Helpers/Export/Csv.cs b/Elwig/Helpers/Export/Csv.cs
index 79f91ab..e34691c 100644
--- a/Elwig/Helpers/Export/Csv.cs
+++ b/Elwig/Helpers/Export/Csv.cs
@@ -1,4 +1,50 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
 namespace Elwig.Helpers.Export {
-    public class Csv {
+    public abstract class Csv<T> : IExporter<T> {
+        public static string FileExtension => "csv";
+
+        protected readonly StreamWriter Writer;
+        protected readonly char Separator;
+        protected string? Header;
+
+        public Csv(string filename, char separator = ';') : this(filename, separator, Encoding.UTF8) { }
+
+        public Csv(string filename, char separator, Encoding encoding) {
+            Writer = new StreamWriter(filename, false, encoding);
+            Separator = separator;
+        }
+
+        public void Dispose() {
+            GC.SuppressFinalize(this);
+            Writer.Dispose();
+        }
+
+        public ValueTask DisposeAsync() {
+            GC.SuppressFinalize(this);
+            return Writer.DisposeAsync();
+        }
+
+        public async Task ExportAsync(IEnumerable<T> data) {
+            if (Header != null) await Writer.WriteLineAsync(Header);
+            foreach (var row in data) {
+                await Writer.WriteLineAsync(FormatRow(row));
+            }
+        }
+
+        public void Export(IEnumerable<T> data) {
+            ExportAsync(data).GetAwaiter().GetResult();
+        }
+
+        public string FormatRow(IEnumerable row) {
+            return string.Join(Separator, row);
+        }
+
+        public abstract string FormatRow(T row);
     }
 }
diff --git a/Elwig/Helpers/Export/Ebics.cs b/Elwig/Helpers/Export/Ebics.cs
index 337e001..f454ccb 100644
--- a/Elwig/Helpers/Export/Ebics.cs
+++ b/Elwig/Helpers/Export/Ebics.cs
@@ -1,14 +1,26 @@
-using Elwig.Models;
+using Elwig.Helpers.Billing;
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace Elwig.Helpers.Export {
-    public class Ebics : IBankingProvider {
+    public class Ebics : IBankingExporter {
 
-        public string FileExtension => "xml";
+        public static string FileExtension => "xml";
 
-        public Task Export(string filename, int avnr, IEnumerable<Member> members) {
+        public void Dispose() {
+            throw new NotImplementedException();
+        }
+
+        public ValueTask DisposeAsync() {
+            throw new NotImplementedException();
+        }
+
+        public void Export(IEnumerable<Transaction> data) {
+            throw new NotImplementedException();
+        }
+
+        public Task ExportAsync(IEnumerable<Transaction> data) {
             throw new NotImplementedException();
         }
     }
diff --git a/Elwig/Helpers/Export/Elba.cs b/Elwig/Helpers/Export/Elba.cs
index 15be0c8..8894332 100644
--- a/Elwig/Helpers/Export/Elba.cs
+++ b/Elwig/Helpers/Export/Elba.cs
@@ -1,14 +1,14 @@
-using Elwig.Models;
+using Elwig.Helpers.Billing;
 using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
 
 namespace Elwig.Helpers.Export {
-    public class Elba : IBankingProvider {
+    public class Elba : Csv<Transaction>, IBankingExporter {
 
-        public string FileExtension => "elba";
+        public static new string FileExtension => "elba";
 
-        public Task Export(string filename, int avnr, IEnumerable<Member> members) {
+        public Elba(string filename) : base(filename) { }
+
+        public override string FormatRow(Transaction row) {
             throw new NotImplementedException();
         }
     }
diff --git a/Elwig/Helpers/Export/IBankingExporter.cs b/Elwig/Helpers/Export/IBankingExporter.cs
new file mode 100644
index 0000000..30a89e0
--- /dev/null
+++ b/Elwig/Helpers/Export/IBankingExporter.cs
@@ -0,0 +1,8 @@
+using Elwig.Helpers.Billing;
+
+namespace Elwig.Helpers.Export {
+    /// <summary>
+    /// Interface for exporting banking data
+    /// </summary>
+    public interface IBankingExporter : IExporter<Transaction> { }
+}
diff --git a/Elwig/Helpers/Export/IBankingProvider.cs b/Elwig/Helpers/Export/IBankingProvider.cs
deleted file mode 100644
index a50282a..0000000
--- a/Elwig/Helpers/Export/IBankingProvider.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-using Elwig.Models;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-
-namespace Elwig.Helpers.Export {
-    /// <summary>
-    /// Interface for exporting banking data
-    /// </summary>
-    public interface IBankingProvider {
-        /// <summary>
-        /// The default file extension of the exported files to be used (whithout a preceding ".")
-        /// </summary>
-        string FileExtension { get; }
-
-        /// <summary>
-        /// Export the member payment data of the given payment variant to the given file.
-        /// (The amount of the last payed variant is deducted from the calculated amount.)
-        /// </summary>
-        /// <param name="filename">The file to export the data to</param>
-        /// <param name="avnr">The number of the payment variant to export</param>
-        /// <param name="members">The members whose data to include in the export</param>
-        Task Export(string filename, int avnr, IEnumerable<Member> members);
-    }
-}
diff --git a/Elwig/Helpers/Export/IExporter.cs b/Elwig/Helpers/Export/IExporter.cs
new file mode 100644
index 0000000..8f9b92e
--- /dev/null
+++ b/Elwig/Helpers/Export/IExporter.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Export {
+    public interface IExporter<T> : IDisposable, IAsyncDisposable {
+        /// <summary>
+        /// The default file extension of the exported files to be used (whithout a preceding ".")
+        /// </summary>
+        static string FileExtension { get; }
+
+        /// <summary>
+        /// Export the given data to the given file.
+        /// </summary>
+        /// <param name="data">The data to be exported</param>
+        void Export(IEnumerable<T> data);
+
+        /// <summary>
+        /// Export the given data to the given file.
+        /// </summary>
+        /// <param name="data">The data to be exported</param>
+        Task ExportAsync(IEnumerable<T> data);
+    }
+}