diff --git a/.gitignore b/.gitignore
index 3004ef6..352cc03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .ing.conf
 **/logs/
-**/Transaktionen/
\ No newline at end of file
+**/Transaktionen/
+Kategorien.json
\ No newline at end of file
diff --git a/categorize_transactions.py b/categorize_transactions.py
new file mode 100644
index 0000000..dee4a6c
--- /dev/null
+++ b/categorize_transactions.py
@@ -0,0 +1,242 @@
+#!/usr/bin/env python3
+
+from pathlib import Path
+from datetime import datetime
+import json
+import csv
+import sys
+
+# --------------------------------------------------
+# Kalenderwoche bestimmen
+# --------------------------------------------------
+
+if len(sys.argv) == 3:
+    year = int(sys.argv[1])
+    week = int(sys.argv[2])
+else:
+    year, week, _ = datetime.now().isocalendar()
+
+# --------------------------------------------------
+# Kategorien laden
+# --------------------------------------------------
+
+categories_file = Path.home() / "Kategorien.json"
+
+if not categories_file.exists():
+    categories_file = Path(__file__).parent / "Kategorien.json"
+
+with open(categories_file, encoding="utf-8") as f:
+    categories = json.load(f)
+
+# --------------------------------------------------
+# Verzeichnisse bestimmen
+# --------------------------------------------------
+
+base_dir = Path.home() / "Transaktionen"
+
+if not base_dir.exists():
+    base_dir = Path(__file__).parent / "Transaktionen"
+
+year_dir = base_dir / str(year)
+
+source_json = (
+    year_dir
+    / "json"
+    / f"transactions_{year}_KW{week:02d}.json"
+)
+
+categorized_csv_dir = year_dir / "categorized_csv"
+categorized_json_dir = year_dir / "categorized_json"
+summary_dir = year_dir / "summary"
+
+categorized_csv_dir.mkdir(parents=True, exist_ok=True)
+categorized_json_dir.mkdir(parents=True, exist_ok=True)
+summary_dir.mkdir(parents=True, exist_ok=True)
+
+csv_file = (
+    categorized_csv_dir
+    / f"categorized_transactions_{year}_KW{week:02d}.csv"
+)
+
+json_file = (
+    categorized_json_dir
+    / f"categorized_transactions_{year}_KW{week:02d}.json"
+)
+
+summary_file = (
+    summary_dir
+    / f"category_summary_{year}_KW{week:02d}.json"
+)
+
+# --------------------------------------------------
+# Prüfen ob Quelldatei existiert
+# --------------------------------------------------
+
+if not source_json.exists():
+    print(f"Datei nicht gefunden: {source_json}")
+    sys.exit(1)
+
+# --------------------------------------------------
+# Transaktionen laden
+# --------------------------------------------------
+
+with open(source_json, encoding="utf-8") as f:
+    transactions = json.load(f)
+
+# --------------------------------------------------
+# Kategorien vorbereiten
+# --------------------------------------------------
+
+category_totals = {}
+
+for category in categories.keys():
+    category_totals[category] = {
+        "income": 0.0,
+        "expenses": 0.0,
+        "saldo": 0.0
+    }
+
+category_totals["Unbekannt"] = {
+    "income": 0.0,
+    "expenses": 0.0,
+    "saldo": 0.0
+}
+
+categorized_transactions = []
+
+# --------------------------------------------------
+# Transaktionen kategorisieren
+# --------------------------------------------------
+
+for transaction in transactions:
+
+    search_text = (
+        f"{transaction.get('applicant_name', '')} "
+        f"{transaction.get('purpose', '')} "
+        f"{transaction.get('posting_text', '')}"
+    ).lower()
+
+    category_found = "Unbekannt"
+
+    for category, keywords in categories.items():
+
+        found = False
+
+        for keyword in keywords:
+
+            if keyword.lower() in search_text:
+                category_found = category
+                found = True
+                break
+
+        if found:
+            break
+
+    categorized_transaction = transaction.copy()
+    categorized_transaction["category"] = category_found
+
+    categorized_transactions.append(categorized_transaction)
+
+    amount = float(transaction.get("amount", 0))
+
+    if amount >= 0:
+        category_totals[category_found]["income"] += amount
+    else:
+        category_totals[category_found]["expenses"] += abs(amount)
+
+    category_totals[category_found]["saldo"] += amount
+
+# --------------------------------------------------
+# Kategorien runden
+# --------------------------------------------------
+
+for category in category_totals:
+
+    category_totals[category]["income"] = round(
+        category_totals[category]["income"],
+        2
+    )
+
+    category_totals[category]["expenses"] = round(
+        category_totals[category]["expenses"],
+        2
+    )
+
+    category_totals[category]["saldo"] = round(
+        category_totals[category]["saldo"],
+        2
+    )
+
+# --------------------------------------------------
+# CSV exportieren
+# --------------------------------------------------
+
+with open(csv_file, "w", newline="", encoding="utf-8") as csvfile:
+
+    writer = csv.DictWriter(
+        csvfile,
+        fieldnames=[
+            "date",
+            "amount",
+            "category",
+            "posting_text",
+            "applicant_name",
+            "purpose"
+        ],
+        delimiter=";"
+    )
+
+    writer.writeheader()
+    writer.writerows(categorized_transactions)
+
+# --------------------------------------------------
+# JSON exportieren
+# --------------------------------------------------
+
+with open(json_file, "w", encoding="utf-8") as outfile:
+
+    json.dump(
+        categorized_transactions,
+        outfile,
+        ensure_ascii=False,
+        indent=2
+    )
+
+# --------------------------------------------------
+# Kategorien-Summen exportieren
+# --------------------------------------------------
+
+with open(summary_file, "w", encoding="utf-8") as outfile:
+
+    json.dump(
+        category_totals,
+        outfile,
+        ensure_ascii=False,
+        indent=2
+    )
+
+# --------------------------------------------------
+# Ausgabe
+# --------------------------------------------------
+
+print(f"Jahr           : {year}")
+print(f"Kalenderwoche  : {week}")
+print(f"Transaktionen  : {len(categorized_transactions)}")
+print()
+
+print("Summen pro Kategorie:")
+print()
+
+for category, values in sorted(category_totals.items()):
+
+    print(
+        f"{category:20} "
+        f"Einnahmen: {values['income']:10.2f} EUR   "
+        f"Ausgaben: {values['expenses']:10.2f} EUR   "
+        f"Saldo: {values['saldo']:10.2f} EUR"
+    )
+
+print()
+print(f"CSV      : {csv_file}")
+print(f"JSON     : {json_file}")
+print(f"Summary  : {summary_file}")
\ No newline at end of file