diff --git a/main.py b/main.py
new file mode 100644
index 0000000..a02f8e1
--- /dev/null
+++ b/main.py
@@ -0,0 +1,24 @@
+from datetime import datetime
+from decimal import Decimal
+import csv
+import os
+
+from parsers import Bank1, Bank2, Bank3, Parser
+
+
+def write_transactions(file, transactions, append=False):
+    with open(file, "a" if append else "w", newline="", encoding="utf-8") as f:
+        writer = csv.writer(f, delimiter="\t")
+        writer.writerows(transactions)
+
+
+def parse(parser: Parser, input, output, reverse=True, encoding="utf-8"):
+    transactions = parser.parse(input, encoding)
+    if reverse:
+        transactions.reverse()
+    write_transactions(output, transactions)
+
+# parse(Bank1(), ".rawdata/Bank1_2019.csv", "data/2019_Bank1.csv")
+# parse(Bank2(), ".rawdata/Bank2_2020.csv", "data/2020_Bank2.csv", reverse=False)
+# parse(Bank2(cc=True), ".rawdata/Bank2CC_2020.csv", "data/2020_Bank2CC.csv", reverse=False)
+# parse(Bank3(), ".rawdata/Bank3_2019.csv", "data/2019_Bank3.csv", encoding="windows-1252")
diff --git a/parsers.py b/parsers.py
new file mode 100644
index 0000000..d93792b
--- /dev/null
+++ b/parsers.py
@@ -0,0 +1,112 @@
+from datetime import datetime
+from decimal import Decimal, InvalidOperation
+
+
+class Parser:
+    @staticmethod
+    def get_transactions(file, encoding, sep="\t"):
+        with open(file, newline="", encoding=encoding) as f:
+            transactions = [line.rstrip().split(sep) for line in f]
+
+        return transactions
+
+    def parse(self, file, encoding="utf-8"):
+        pass
+
+
+class Bank1(Parser):
+    """Bank 1 parser
+
+    Bank 1 transcripts have the following properties:
+    encoding: utf-8
+    separator: ;
+    starting line: 5
+    date format: %d/%m/%Y
+    """
+
+    def parse(self, file, encoding="utf-8"):
+        transactions = []
+
+        for transaction in self.get_transactions(file, encoding, sep=";")[5:]:
+            transaction = [field.rstrip() for field in transaction]
+            date = datetime.strptime(transaction[1], "%d/%m/%Y").date()
+            description = " ".join(transaction[3].split())
+            value = Decimal(transaction[4])
+
+            transactions.append([date.isoformat(), description, "Bank1", value])
+
+        return transactions
+
+
+class Bank2(Parser):
+    """Bank 2 parser
+
+    Bank 2 transcripts have the following properties:
+    encoding: utf-8
+    separator: tab
+    date format: %d/%m/%Y
+    decimal separator: ,
+
+    Bank 2 also has an associated credit card, for which the transaction value
+    has to be negated.
+    """
+
+    def __init__(self, cc=False):
+        self.cc = cc
+
+    def parse(self, file, encoding="utf-8"):
+        transactions = []
+
+        for transaction in self.get_transactions(file, encoding):
+            date = datetime.strptime(transaction[0], "%d/%m/%Y").date()
+            description = transaction[2]
+            try:
+                value = Decimal(transaction[3])
+            except InvalidOperation:
+                transaction[3] = transaction[3].replace(",", "")
+                value = Decimal(transaction[3])
+
+            if not self.cc:
+                card = "Bank2"
+            else:
+                value = -value
+                card = "Bank2 CC"
+
+            transactions.append([date.isoformat(), description, card, value])
+
+        return transactions
+
+
+class Bank3(Parser):
+    """Bank 3 parser
+
+    Bank 3 transcripts have the following properties:
+    encoding: windows-1252 (passed as argument)
+    separator: ;
+    starting line: 7
+    finishing line: -1
+    date format: %d-%m-%Y
+    decimal separator: ,
+    thousands separator: .
+
+    Bank 3 has credits in a different column from debits. These also have to be
+    negated.
+    """
+
+    def parse(self, file, encoding="utf-8"):
+        transactions = []
+
+        for transaction in self.get_transactions(file, encoding, sep=";")[7:-1]:
+            transaction = [field.rstrip() for field in transaction]
+            date = datetime.strptime(transaction[1], "%d-%m-%Y").date()
+            description = transaction[2]
+            if t := transaction[3]:
+                t = t.replace(".", "").replace(",", ".")
+                value = -Decimal(t)
+            else:
+                t = transaction[4].replace(".", "").replace(",", ".")
+                value = Decimal(t)
+
+            transactions.append([date.isoformat(), description, "Bank3", value])
+
+        return transactions