reubano · JonDerThan · Jan 18, 2026
diff --git a/csv2ofx/mappings/c24.py b/csv2ofx/mappings/c24.py
@@ -0,0 +1,95 @@
+"""Mapping for the German C24 bank.
+
+The C24 bank supports sub-accounts. Every transaction in the CSV file has a
+user-configurable account name "Kontoname". Transactions from all sub-accounts
+are stored chronologically in this list. The transaction list includes both
+intrabank transfers between these accounts ("internal") as well as all other
+transactions ("external").
+
+OFX files have a special way of identifying intrabank transfers `<INTRATRNRS>`
+but the file can either only include intrabank transfers or normal ones. The
+expected behaviour would be to list all transactions, with intrabank and normal
+transactions having the same formatting. In some cases however, the user may
+want to have a properly formatted list of intrabank transfers as well. Toward
+this, the environment variable `TRANSACTIONS` can be used.
+
+Possible `TRANSACTIONS` env var values:
+- "all" (default): Include all transactions as normal statements. There is no
+    way to differentiate intrabank transfers.
+- "internal": Only include intrabank transfers.
+- "external": Only include normal transfers. Accounts will have weird balances.
+"""
+
+from __future__ import annotations
+
+from operator import itemgetter
+from os import environ
+from sys import stderr
+
+_INCLUDE_INTERNAL_TX = True
+_INCLUDE_EXTERNAL_TX = True
+tmp = environ.get("TRANSACTIONS", "all").lower()
+if tmp == "internal":
+    _INCLUDE_INTERNAL_TX = True
+    _INCLUDE_EXTERNAL_TX = False
+elif tmp == "external":
+    _INCLUDE_INTERNAL_TX = False
+    _INCLUDE_EXTERNAL_TX = True
+elif tmp != "all":
+    print("TRANSACTIONS: invalid environment variable value!", file=stderr)
+
+
+# "Pocket-Umbuchung" is a manual transfer between sub accounts, "Sparen" is when
+# the user configured automatic transfer rules at certain events.
+def _is_split_tx(tx: dict[str, str]) -> bool:
+    tx_type = tx["Transaktionstyp"]
+    return tx_type in {"Pocket-Umbuchung", "Sparen"}
+
+
+def _get_split_recipient(tx: dict[str, str]) -> str | None:
+    if not _is_split_tx(tx):
+        return None
+    split_recipient = tx["Zahlungsempfänger"]
+    return split_recipient
+
+
+def _filter_tx(tx: dict[str, str]) -> bool:
+    is_split = _is_split_tx(tx)
+    if is_split:
+        return _INCLUDE_INTERNAL_TX
+    else:
+        return _INCLUDE_EXTERNAL_TX
+
+
+# We MUST NOT use the "Kontonummer" as account ID, because for transfers between
+# sub accounts there is no recipient "Kontonummer". By using the default
+# generated hash of the sender name "Kontoname" and the recipient name
+# "Zahlungsempfänger", internal transfers can be associated correctly.
+mapping = {
+    "has_header": True,
+    "currency": "EUR",
+    "delimiter": ",",
+    "bank": "C24",
+    "account": itemgetter("Kontoname"),
+    "date": itemgetter("Buchungsdatum"),
+    "parse_fmt": "%d.%m.%Y",
+    "amount": lambda tx: tx["Betrag"].replace(".", "").replace(",", "."),
+    "desc": itemgetter("Verwendungszweck"),
+    "payee": itemgetter("Zahlungsempfänger"),
+    "filter": _filter_tx,
+    # Setting this entry to anything other than `None` implicitly toggles the
+    # intrabank transfer output, which cannot include normal/external
+    # statements. Sets this getter only when not including these normal
+    # statements.
+    "split_account": _get_split_recipient if not _INCLUDE_EXTERNAL_TX else None,
+    # I don't like how the values below just get added to the memo. Feel free
+    # to re-include them.
+    #
+    # An automatic/manual categorization of the transaction.
+    # "class": itemgetter("Unterkategorie"),
+    #
+    # This seems to be a more human-readable name of the payee. In credit card
+    # statements, this may be the name of the credit card owner while the payee
+    # ("Zahlungsempfänger") is the name of the credit card provider.
+    # "notes": itemgetter("Beschreibung"),
+}
diff --git a/data/converted/c24.ofx b/data/converted/c24.ofx
@@ -0,0 +1,71 @@
+DATA:OFXSGML
+ENCODING:UTF-8
+<OFX>
+	<SIGNONMSGSRSV1>
+		<SONRS>
+			<STATUS>
+				<CODE>0</CODE>
+				<SEVERITY>INFO</SEVERITY>
+			</STATUS>
+			<DTSERVER>20161031112908</DTSERVER>
+			<LANGUAGE>ENG</LANGUAGE>
+		</SONRS>
+	</SIGNONMSGSRSV1>
+	<BANKMSGSRSV1>
+		<STMTTRNRS>
+			<TRNUID></TRNUID>
+			<STATUS>
+				<CODE>0</CODE>
+				<SEVERITY>INFO</SEVERITY>
+			</STATUS>
+			<STMTRS>
+				<CURDEF>EUR</CURDEF>
+				<BANKACCTFROM>
+					<BANKID>78a1d6227c674fedd66d7165ce318750</BANKID>
+					<ACCTID>6eea69609b81079b892c61e79829798b</ACCTID>
+					<ACCTTYPE>CHECKING</ACCTTYPE>
+				</BANKACCTFROM>
+				<BANKTRANLIST>
+					<DTSTART>19700101</DTSTART>
+					<DTEND>20260118</DTEND>
+					<STMTTRN>
+						<TRNTYPE>DEBIT</TRNTYPE>
+						<DTPOSTED>20251205000000</DTPOSTED>
+						<TRNAMT>-123.45</TRNAMT>
+						<FITID>50424a98e3219cee1726a03dd03b52f1</FITID>
+						<NAME>My savings account</NAME>
+						<MEMO>To be donated</MEMO>
+					</STMTTRN>
+				</BANKTRANLIST>
+			</STMTRS>
+			<STMTRS>
+				<CURDEF>EUR</CURDEF>
+				<BANKACCTFROM>
+					<BANKID>78a1d6227c674fedd66d7165ce318750</BANKID>
+					<ACCTID>011a79ab1760c0682e01cdf35eb5ed71</ACCTID>
+					<ACCTTYPE>SAVINGS</ACCTTYPE>
+				</BANKACCTFROM>
+				<BANKTRANLIST>
+					<DTSTART>19700101</DTSTART>
+					<DTEND>20260118</DTEND>
+					<STMTTRN>
+						<TRNTYPE>CREDIT</TRNTYPE>
+						<DTPOSTED>20251205000000</DTPOSTED>
+						<TRNAMT>123.45</TRNAMT>
+						<FITID>2021f0587851c9d9f868034f5ea0854d</FITID>
+						<NAME>My main account</NAME>
+						<MEMO>To be donated</MEMO>
+					</STMTTRN>
+					<STMTTRN>
+						<TRNTYPE>DEBIT</TRNTYPE>
+						<DTPOSTED>20260105000000</DTPOSTED>
+						<TRNAMT>-50.00</TRNAMT>
+						<FITID>80e455fe30ba0c2243aa64f0b0ce5a31</FITID>
+						<NAME>Ärzte ohne Grenzen</NAME>
+						<MEMO>Ihre Spendernummer 1234567 SEPA-Mandat 1234567-001 Vielen Dank für Ihre Spende</MEMO>
+					</STMTTRN>
+				</BANKTRANLIST>
+			</STMTRS>
+		</STMTTRNRS>
+	</BANKMSGSRSV1>
+</OFX>
diff --git a/data/test/c24.csv b/data/test/c24.csv
@@ -0,0 +1,4 @@
+Transaktionstyp,Buchungsdatum,Karteneinsatz,Betrag,Zahlungsempfänger,IBAN,BIC,Verwendungszweck,Beschreibung,Kontonummer,Kontoname,Kategorie,Unterkategorie,Bargeldabhebung
+Pocket-Umbuchung,05.12.2025,,"-123,45 €",My savings account,,,To be donated,,0987654321,My main account,Umbuchung,Umbuchung
+Pocket-Umbuchung,05.12.2025,,"123,45 €",My main account,,,To be donated,FULL_LEGAL_NAME,1234567890,My savings account,Umbuchung,Umbuchung
+SEPA-Lastschrift,05.01.2026,,"-50,00 €",Ärzte ohne Grenzen,PAYEE_IBAN,PAYEE_BIC,Ihre Spendernummer 1234567 SEPA-Mandat 1234567-001 Vielen Dank für Ihre Spende,"Medecins Sans Frontieres (MSF) - Ärzte ohne Grenzen, Dt. Sektion",1234567890,My savings account,Finanzen & Steuern,Spende
diff --git a/tests/test_cli.py b/tests/test_cli.py
@@ -113,6 +113,11 @@
         'n26-fr.csv',
         'n26.ofx',
     ),
+    (
+        ['-o', '-m c24', "-e 20260118"],
+        'c24.csv',
+        'c24.ofx',
+    ),
 ]