diff --git a/README.md b/README.md
index f44edea..adc9217 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,12 @@ Placeholders use `{{group.field}}`. Available values include:
 
 - Member: `member.number`, `member.first_name`, `member.last_name`,
   `member.full_name`, `member.email`, `member.birth_date`, `member.status`,
-  `member.accepted_at`, `member.started_at`
+  `member.accepted_at`, `member.started_at`, `member.phone`, `member.street`,
+  `member.address_addition`, `member.postal_code`, `member.city`,
+  `member.country`, `member.address_line`, `member.account_holder`,
+  `member.iban`, `member.bic`, `member.mandate_reference`,
+  `member.mandate_signed_at`, `member.mandate_revoked_at`,
+  `member.mandate_active`
 - Claim: `claim.id`, `claim.title`, `claim.due_date`, `claim.total`,
   `claim.paid`, `claim.balance`, `claim.status`, `claim.items`
 - Reminder: `reminder.id`, `reminder.level`, `reminder.name`,
@@ -81,6 +86,11 @@ Placeholders use `{{group.field}}`. Available values include:
   `reminder.payment_deadline`, `reminder.payment_deadline_days`,
   `reminder.fee`, `reminder.detail`, `reminder.channel`
 - Document: `document.date`, `document.datetime`
+- Organization: `organization.name`, `organization.street`,
+  `organization.postal_code`, `organization.city`, `organization.country`,
+  `organization.address_line`, `organization.email`, `organization.phone`,
+  `organization.website`, `organization.iban`, `organization.bic`,
+  `organization.creditor_id`
 
 Claim placeholders are available from a claim tab. Reminder placeholders are
 available when a reminder row is selected before opening the document dialog.
diff --git a/src/ccma/assets/CHANGELOG.json b/src/ccma/assets/CHANGELOG.json
index f7985be..3e23f1c 100644
--- a/src/ccma/assets/CHANGELOG.json
+++ b/src/ccma/assets/CHANGELOG.json
@@ -26,6 +26,7 @@
       "Forderungen besitzen eigene Arbeitsansichten mit Teilzahlungen, GnuCash-Referenzen, Zahlungszuordnungen, Mahnungen und Gebühren.",
       "Positionen, Zahlungen und Mahnungen einer Forderung werden gemeinsam in einer farblich gruppierten Übersicht dargestellt.",
       "OpenDocument-Templates mit Platzhaltern, lokaler PDF-Erzeugung, Audit-Verknüpfung und Dokumentöffnung aus der Mitgliederakte ergänzt.",
+      "Zentrale Vereins- und Absenderdaten sowie getrennte Mitgliedsbereiche für Anschrift, Telefon und validierte Bank-/SEPA-Daten ergänzt.",
       "Dropdowns zeigen deutsche Begriffe bei weiterhin englischen Speicher-Keys; der Hausmeisterstatus liegt einheitlich in housekeeper.json.",
       "Mehrstufiger Mahnworkflow mit Hausmeister-Regel, Entwurf, Versandbestätigung, Zahlungsfrist, optionaler Gebühr und Mahnsperre ergänzt.",
       "Splash-Screen auf das eingebettete CCMA-Hintergrundmotiv umgestellt und redundante Titeltexte entfernt.",
diff --git a/src/ccma/assets/templates/Forderung.fodt b/src/ccma/assets/templates/Forderung.fodt
index 995004b..2f884e8 100644
--- a/src/ccma/assets/templates/Forderung.fodt
+++ b/src/ccma/assets/templates/Forderung.fodt
@@ -6,17 +6,20 @@
   </office:styles>
   <office:body>
     <office:text>
-      <text:p text:style-name="Title">Chaos Computer Club Mannheim e.V.</text:p>
+      <text:p text:style-name="Title">{{organization.name}}</text:p>
+      <text:p>{{organization.address_line}} · {{organization.email}}</text:p>
       <text:p>Erstellt am {{document.date}}</text:p>
       <text:p text:style-name="Heading">Forderung: {{claim.title}}</text:p>
       <text:p>Mitglied: {{member.full_name}} ({{member.number}})</text:p>
       <text:p>E-Mail: {{member.email}}</text:p>
+      <text:p>Anschrift: {{member.address_line}}</text:p>
       <text:p>Fällig am: {{claim.due_date}}</text:p>
       <text:p text:style-name="Heading">Positionen</text:p>
       <text:p>{{claim.items}}</text:p>
       <text:p>Gesamtbetrag: {{claim.total}}</text:p>
       <text:p>Bereits bezahlt: {{claim.paid}}</text:p>
       <text:p text:style-name="Heading">Offener Betrag: {{claim.balance}}</text:p>
+      <text:p>Zahlung an {{organization.iban}} · BIC {{organization.bic}}</text:p>
       <text:p>Forderungs-ID: {{claim.id}}</text:p>
     </office:text>
   </office:body>
diff --git a/src/ccma/assets/templates/Mahnung.fodt b/src/ccma/assets/templates/Mahnung.fodt
index fe34e4d..87afdb1 100644
--- a/src/ccma/assets/templates/Mahnung.fodt
+++ b/src/ccma/assets/templates/Mahnung.fodt
@@ -6,13 +6,16 @@
   </office:styles>
   <office:body>
     <office:text>
-      <text:p text:style-name="Title">Chaos Computer Club Mannheim e.V.</text:p>
+      <text:p text:style-name="Title">{{organization.name}}</text:p>
+      <text:p>{{organization.address_line}} · {{organization.email}}</text:p>
       <text:p>{{document.date}}</text:p>
       <text:p>An {{member.full_name}} ({{member.number}})</text:p>
+      <text:p>{{member.address_line}}</text:p>
       <text:p text:style-name="Heading">{{reminder.name}}</text:p>
       <text:p>Zu unserer Forderung „{{claim.title}}“ ist weiterhin ein Betrag von {{claim.balance}} offen.</text:p>
       <text:p>Bitte begleiche den offenen Betrag innerhalb von {{reminder.payment_deadline_days}} Tagen.</text:p>
       <text:p>Mahngebühr: {{reminder.fee}}</text:p>
+      <text:p>Zahlung an {{organization.iban}} · BIC {{organization.bic}}</text:p>
       <text:p>{{reminder.detail}}</text:p>
       <text:p>Forderungs-ID: {{claim.id}}</text:p>
       <text:p>Mahnstufe: {{reminder.level}}</text:p>
diff --git a/src/ccma/assets/templates/Mitglied.fodt b/src/ccma/assets/templates/Mitglied.fodt
index 8ad25d4..e06374b 100644
--- a/src/ccma/assets/templates/Mitglied.fodt
+++ b/src/ccma/assets/templates/Mitglied.fodt
@@ -6,12 +6,14 @@
   </office:styles>
   <office:body>
     <office:text>
-      <text:p text:style-name="Title">Chaos Computer Club Mannheim e.V.</text:p>
+      <text:p text:style-name="Title">{{organization.name}}</text:p>
       <text:p>Erstellt am {{document.date}}</text:p>
       <text:p text:style-name="Heading">Mitgliedsdaten</text:p>
       <text:p>Name: {{member.full_name}}</text:p>
       <text:p>Mitgliedsnummer: {{member.number}}</text:p>
       <text:p>E-Mail: {{member.email}}</text:p>
+      <text:p>Telefon: {{member.phone}}</text:p>
+      <text:p>Anschrift: {{member.address_line}}</text:p>
       <text:p>Geburtsdatum: {{member.birth_date}}</text:p>
       <text:p>Mitglied seit: {{member.started_at}}</text:p>
       <text:p>Status: {{member.status}}</text:p>
diff --git a/src/ccma/domain/models.py b/src/ccma/domain/models.py
index 9cd2c84..81cef64 100644
--- a/src/ccma/domain/models.py
+++ b/src/ccma/domain/models.py
@@ -28,7 +28,20 @@ class Member:
     first_name: str
     last_name: str
     email: str = ""
+    phone: str = ""
     birth_date: str = ""
+    street: str = ""
+    address_addition: str = ""
+    postal_code: str = ""
+    city: str = ""
+    country: str = "Deutschland"
+    account_holder: str = ""
+    iban: str = ""
+    bic: str = ""
+    mandate_reference: str = ""
+    mandate_signed_at: str = ""
+    mandate_active: bool = False
+    mandate_revoked_at: str = ""
     status: str = "application"
     accepted_at: str = ""
     membership_started_at: str = ""
@@ -54,6 +67,23 @@ class Member:
                 "last_name": self.last_name,
                 "birth_date": self.birth_date,
                 "email": self.email,
+                "phone": self.phone,
+            },
+            "address": {
+                "street": self.street,
+                "addition": self.address_addition,
+                "postal_code": self.postal_code,
+                "city": self.city,
+                "country": self.country,
+            },
+            "banking": {
+                "account_holder": self.account_holder,
+                "iban": self.iban,
+                "bic": self.bic,
+                "mandate_reference": self.mandate_reference,
+                "mandate_signed_at": self.mandate_signed_at,
+                "mandate_active": self.mandate_active,
+                "mandate_revoked_at": self.mandate_revoked_at,
             },
             "membership": {
                 "status": self.status,
@@ -75,6 +105,8 @@ class Member:
         person = data.get("person") or {}
         membership = data.get("membership") or {}
         contribution = data.get("contribution_profile") or {}
+        address = data.get("address") or {}
+        banking = data.get("banking") or {}
         return cls(
             schema_version=int(data.get("schema_version", 1)),
             member_id=str(data["member_id"]),
@@ -82,7 +114,20 @@ class Member:
             first_name=str(person.get("first_name", "")),
             last_name=str(person.get("last_name", "")),
             email=str(person.get("email", "")),
+            phone=str(person.get("phone", "")),
             birth_date=str(person.get("birth_date", "")),
+            street=str(address.get("street", "")),
+            address_addition=str(address.get("addition", "")),
+            postal_code=str(address.get("postal_code", "")),
+            city=str(address.get("city", "")),
+            country=str(address.get("country", "Deutschland")),
+            account_holder=str(banking.get("account_holder", "")),
+            iban=str(banking.get("iban", "")),
+            bic=str(banking.get("bic", "")),
+            mandate_reference=str(banking.get("mandate_reference", "")),
+            mandate_signed_at=str(banking.get("mandate_signed_at", "")),
+            mandate_active=bool(banking.get("mandate_active", False)),
+            mandate_revoked_at=str(banking.get("mandate_revoked_at", "")),
             status=str(membership.get("status", "application")),
             accepted_at=str(membership.get("accepted_at", "")),
             membership_started_at=str(membership.get("started_at", "")),
diff --git a/src/ccma/services/documents.py b/src/ccma/services/documents.py
index 6c8c0f3..70dad3a 100644
--- a/src/ccma/services/documents.py
+++ b/src/ccma/services/documents.py
@@ -116,7 +116,16 @@ class DocumentService:
             if reminder is None:
                 raise DocumentError("Die ausgewählte Mahnung wurde nicht gefunden.")
 
-        values = _template_values(member, data=data, claim=claim, reminder=reminder)
+        organization = self.repository.get_configuration().get("organization") or {}
+        if not isinstance(organization, dict):
+            organization = {}
+        values = _template_values(
+            member,
+            data=data,
+            claim=claim,
+            reminder=reminder,
+            organization=organization,
+        )
         destination_dir = self.repository.members_root / member_id / "files" / "documents"
         destination_dir.mkdir(parents=True, exist_ok=True)
         destination = _available_path(destination_dir, _safe_pdf_name(output_name))
@@ -168,7 +177,18 @@ def _template_values(
     data=None,
     claim: dict | None = None,
     reminder: dict | None = None,
+    organization: dict | None = None,
 ) -> dict[str, str]:
+    organization = organization or {}
+    organization_address = " ".join(
+        part
+        for part in (
+            str(organization.get("street", "")),
+            str(organization.get("postal_code", "")),
+            str(organization.get("city", "")),
+        )
+        if part
+    )
     values = {
         "document.date": format_date_for_display(date.today().isoformat()),
         "document.datetime": datetime.now().astimezone().strftime("%d.%m.%Y %H:%M"),
@@ -178,10 +198,38 @@ def _template_values(
         "member.last_name": member.last_name,
         "member.full_name": member.display_name,
         "member.email": member.email,
+        "member.phone": member.phone,
         "member.birth_date": format_date_for_display(member.birth_date),
         "member.status": MEMBERSHIP_STATUS_LABELS.get(member.status, member.status),
         "member.accepted_at": format_date_for_display(member.accepted_at),
         "member.started_at": format_date_for_display(member.membership_started_at),
+        "member.street": member.street,
+        "member.address_addition": member.address_addition,
+        "member.postal_code": member.postal_code,
+        "member.city": member.city,
+        "member.country": member.country,
+        "member.address_line": " ".join(
+            part for part in (member.street, member.postal_code, member.city) if part
+        ),
+        "member.account_holder": member.account_holder,
+        "member.iban": member.iban,
+        "member.bic": member.bic,
+        "member.mandate_reference": member.mandate_reference,
+        "member.mandate_signed_at": format_date_for_display(member.mandate_signed_at),
+        "member.mandate_revoked_at": format_date_for_display(member.mandate_revoked_at),
+        "member.mandate_active": "Ja" if member.mandate_active else "Nein",
+        "organization.name": str(organization.get("name", "")),
+        "organization.street": str(organization.get("street", "")),
+        "organization.postal_code": str(organization.get("postal_code", "")),
+        "organization.city": str(organization.get("city", "")),
+        "organization.country": str(organization.get("country", "")),
+        "organization.address_line": organization_address,
+        "organization.email": str(organization.get("email", "")),
+        "organization.phone": str(organization.get("phone", "")),
+        "organization.website": str(organization.get("website", "")),
+        "organization.iban": str(organization.get("iban", "")),
+        "organization.bic": str(organization.get("bic", "")),
+        "organization.creditor_id": str(organization.get("creditor_id", "")),
     }
     if claim is not None and data is not None:
         claim_id = str(claim.get("claim_id", ""))
diff --git a/src/ccma/storage/repository.py b/src/ccma/storage/repository.py
index b5b7f50..7ace5e5 100644
--- a/src/ccma/storage/repository.py
+++ b/src/ccma/storage/repository.py
@@ -32,7 +32,19 @@ DEFAULT_MEMBER_NUMBER_PATTERN = "CCMA-{number:04d}"
 
 DEFAULT_CONFIGURATION = {
     "schema_version": 1,
-    "organization": "Chaos Computer Club Mannheim e.V.",
+    "organization": {
+        "name": "Chaos Computer Club Mannheim e.V.",
+        "street": "",
+        "postal_code": "",
+        "city": "Mannheim",
+        "country": "Deutschland",
+        "email": "",
+        "phone": "",
+        "website": "",
+        "iban": "",
+        "bic": "",
+        "creditor_id": "",
+    },
     "member_number_policy": {
         "mode": "automatic",
         "pattern": DEFAULT_MEMBER_NUMBER_PATTERN,
@@ -165,7 +177,7 @@ class MemberRepository:
             raw = read_json(path)
             if not isinstance(raw, dict):
                 raise TypeError("Wurzelelement muss ein JSON-Objekt sein")
-            for section_name in ("person", "membership", "contribution_profile"):
+            for section_name in ("person", "address", "banking", "membership", "contribution_profile"):
                 if section_name in raw and not isinstance(raw[section_name], dict):
                     raise TypeError(f"{section_name} muss ein JSON-Objekt sein")
             return Member.from_dict(raw)
@@ -193,6 +205,7 @@ class MemberRepository:
         first_name: str,
         last_name: str,
         email: str = "",
+        phone: str = "",
         birth_date: str = "",
         member_number: str = "",
     ) -> Member:
@@ -221,6 +234,7 @@ class MemberRepository:
             first_name=first_name.strip(),
             last_name=last_name.strip(),
             email=email.strip(),
+            phone=phone.strip(),
             birth_date=birth_date,
         )
         write_json_atomic(directory / "member.json", member.to_dict())
@@ -240,6 +254,10 @@ class MemberRepository:
             member.birth_date = normalize_date_input(member.birth_date, "Geburtsdatum")
             member.accepted_at = normalize_date_input(member.accepted_at, "Aufnahmebeschluss")
             member.membership_started_at = normalize_date_input(member.membership_started_at, "Mitglied seit")
+            member.mandate_signed_at = normalize_date_input(member.mandate_signed_at, "Mandat erteilt am")
+            member.mandate_revoked_at = normalize_date_input(
+                member.mandate_revoked_at, "Mandat widerrufen am"
+            )
             validate_member_dates(
                 birth_date=member.birth_date,
                 accepted_at=member.accepted_at,
@@ -247,6 +265,16 @@ class MemberRepository:
             )
         except DateValidationError as exc:
             raise RepositoryError(str(exc)) from exc
+        member.iban = normalize_iban(member.iban)
+        member.bic = member.bic.replace(" ", "").upper()
+        validate_iban(member.iban)
+        validate_bic(member.bic)
+        if member.mandate_active and not (
+            member.iban and member.mandate_reference.strip() and member.mandate_signed_at
+        ):
+            raise RepositoryError(
+                "Ein aktives Lastschriftmandat benötigt IBAN, Mandatsreferenz und Erteilungsdatum."
+            )
         if member.member_number != existing.member_number:
             self._assert_member_number_available(member.member_number, exclude_member_id=member.member_id)
         changes = self._summarize_changes(existing, member)
@@ -721,6 +749,10 @@ class MemberRepository:
                 member.last_name,
                 member.display_name,
                 member.email,
+                member.phone,
+                member.street,
+                member.postal_code,
+                member.city,
                 member.birth_date,
                 _german_date(member.birth_date),
             ]
@@ -767,6 +799,18 @@ class MemberRepository:
         config.setdefault("member_number_sequences", {})
         write_json_atomic(self.root / "repository.json", config)
 
+    def save_organization(self, values: dict[str, str]) -> None:
+        organization = {key: str(value).strip() for key, value in values.items()}
+        organization["iban"] = normalize_iban(organization.get("iban", ""))
+        organization["bic"] = organization.get("bic", "").replace(" ", "").upper()
+        validate_iban(organization["iban"])
+        validate_bic(organization["bic"])
+        if not organization.get("name"):
+            raise RepositoryError("Der Vereinsname ist erforderlich.")
+        config = self.get_configuration()
+        config["organization"] = organization
+        write_json_atomic(self.root / "repository.json", config)
+
     def preview_member_number(self, pattern: str | None = None) -> str:
         selected_pattern = pattern or self.get_member_number_policy()["pattern"]
         validate_member_number_pattern(selected_pattern)
@@ -832,12 +876,25 @@ class MemberRepository:
             "first_name": "Vorname",
             "last_name": "Nachname",
             "email": "E-Mail-Adresse",
+            "phone": "Telefonnummer",
             "birth_date": "Geburtsdatum",
             "status": "Status",
             "payment_frequency": "Zahlungsweise",
             "contribution_rule_id": "Beitragsregel",
             "honorary": "Ehrenmitgliedschaft",
             "notes": "interne Notiz",
+            "street": "Anschrift",
+            "address_addition": "Adresszusatz",
+            "postal_code": "Postleitzahl",
+            "city": "Ort",
+            "country": "Land",
+            "account_holder": "Kontoinhaber",
+            "iban": "IBAN",
+            "bic": "BIC",
+            "mandate_reference": "SEPA-Mandatsreferenz",
+            "mandate_signed_at": "Mandat erteilt am",
+            "mandate_active": "Lastschriftmandat aktiv",
+            "mandate_revoked_at": "Mandat widerrufen am",
         }
         changes: list[str] = []
         for field, label in labels.items():
@@ -854,6 +911,29 @@ class MemberRepository:
         return changes
 
 
+def normalize_iban(value: str) -> str:
+    return "".join(value.split()).upper()
+
+
+def validate_iban(value: str) -> None:
+    if not value:
+        return
+    if not 15 <= len(value) <= 34 or not value[:2].isalpha() or not value[2:].isalnum():
+        raise RepositoryError("Die IBAN hat kein gültiges Format.")
+    rearranged = value[4:] + value[:4]
+    numeric = "".join(
+        str(ord(character) - 55) if character.isalpha() else character
+        for character in rearranged
+    )
+    if int(numeric) % 97 != 1:
+        raise RepositoryError("Die IBAN-Prüfsumme ist ungültig.")
+
+
+def validate_bic(value: str) -> None:
+    if value and (len(value) not in {8, 11} or not value.isalnum()):
+        raise RepositoryError("Der BIC muss 8 oder 11 Zeichen enthalten.")
+
+
 def _normalize(value: str) -> str:
     normalized = unicodedata.normalize("NFKD", value.casefold().strip())
     return "".join(character for character in normalized if not unicodedata.combining(character))
diff --git a/src/ccma/ui/dialogs.py b/src/ccma/ui/dialogs.py
index a8c997b..7c52d3f 100644
--- a/src/ccma/ui/dialogs.py
+++ b/src/ccma/ui/dialogs.py
@@ -19,7 +19,7 @@ class NewMemberDialog(tk.Toplevel):
         self.number_policy = repository.get_member_number_policy()
         self.variables = {
             name: tk.StringVar()
-            for name in ("first_name", "last_name", "email", "birth_date", "member_number")
+            for name in ("first_name", "last_name", "email", "phone", "birth_date", "member_number")
         }
         self._build_ui()
         self.bind("<Escape>", lambda _event: self.destroy())
@@ -33,6 +33,7 @@ class NewMemberDialog(tk.Toplevel):
             ("Vorname *", "first_name"),
             ("Nachname *", "last_name"),
             ("E-Mail-Adresse", "email"),
+            ("Telefonnummer", "phone"),
             (f"Geburtsdatum ({date_input_hint()})", "birth_date"),
         ]
         if self.number_policy["mode"] == "manual":
diff --git a/src/ccma/ui/member_tab.py b/src/ccma/ui/member_tab.py
index b0b5ed3..ee7dd71 100644
--- a/src/ccma/ui/member_tab.py
+++ b/src/ccma/ui/member_tab.py
@@ -83,9 +83,13 @@ class MemberTab(ttk.Frame):
         notebook = ttk.Notebook(parent)
         notebook.grid(row=0, column=0, sticky="nsew")
         data_tab = ttk.Frame(notebook, padding=16)
+        address_tab = ttk.Frame(notebook, padding=16)
+        banking_tab = ttk.Frame(notebook, padding=16)
         contribution_tab = ttk.Frame(notebook, padding=16)
         documents_tab = ttk.Frame(notebook, padding=16)
         notebook.add(data_tab, text="Stammdaten")
+        notebook.add(address_tab, text="Anschrift")
+        notebook.add(banking_tab, text="Bank / SEPA")
         notebook.add(contribution_tab, text="Forderungen")
         notebook.add(documents_tab, text="Dokumente")
 
@@ -94,6 +98,7 @@ class MemberTab(ttk.Frame):
             ("Vorname", "first_name"),
             ("Nachname", "last_name"),
             ("E-Mail-Adresse", "email"),
+            ("Telefonnummer", "phone"),
             (f"Geburtsdatum ({date_input_hint()})", "birth_date"),
             (f"Aufnahmebeschluss ({date_input_hint()})", "accepted_at"),
             (f"Mitglied seit ({date_input_hint()})", "membership_started_at"),
@@ -139,6 +144,50 @@ class MemberTab(ttk.Frame):
             row=len(fields) + 2, column=1, sticky="e", pady=(18, 0)
         )
 
+        address_fields = (
+            ("Straße und Hausnummer", "street"),
+            ("Adresszusatz", "address_addition"),
+            ("Postleitzahl", "postal_code"),
+            ("Ort", "city"),
+            ("Land", "country"),
+        )
+        address_tab.columnconfigure(1, weight=1)
+        for row, (label, key) in enumerate(address_fields):
+            self.variables[key] = tk.StringVar()
+            ttk.Label(address_tab, text=label).grid(row=row, column=0, sticky="w", padx=(0, 12), pady=5)
+            ttk.Entry(address_tab, textvariable=self.variables[key], width=42).grid(
+                row=row, column=1, sticky="ew", pady=5
+            )
+        ttk.Button(
+            address_tab, text="Anschrift speichern", style="Accent.TButton", command=self._save
+        ).grid(row=len(address_fields), column=1, sticky="e", pady=(18, 0))
+
+        banking_fields = (
+            ("Kontoinhaber", "account_holder"),
+            ("IBAN", "iban"),
+            ("BIC", "bic"),
+            ("Mandatsreferenz", "mandate_reference"),
+            (f"Mandat erteilt am ({date_input_hint()})", "mandate_signed_at"),
+            (f"Mandat widerrufen am ({date_input_hint()})", "mandate_revoked_at"),
+        )
+        banking_tab.columnconfigure(1, weight=1)
+        for row, (label, key) in enumerate(banking_fields):
+            self.variables[key] = tk.StringVar()
+            ttk.Label(banking_tab, text=label).grid(row=row, column=0, sticky="w", padx=(0, 12), pady=5)
+            ttk.Entry(banking_tab, textvariable=self.variables[key], width=42).grid(
+                row=row, column=1, sticky="ew", pady=5
+            )
+        self.variables["mandate_active"] = tk.BooleanVar()
+        ttk.Checkbutton(
+            banking_tab,
+            text="SEPA-Lastschriftmandat ist aktiv",
+            variable=self.variables["mandate_active"],
+            style="Switch",
+        ).grid(row=len(banking_fields), column=0, columnspan=2, sticky="w", pady=(12, 5))
+        ttk.Button(
+            banking_tab, text="Bankdaten speichern", style="Accent.TButton", command=self._save
+        ).grid(row=len(banking_fields) + 1, column=1, sticky="e", pady=(18, 0))
+
         contribution_tab.columnconfigure(0, weight=1)
         contribution_tab.rowconfigure(1, weight=1)
         self.contribution_summary = tk.StringVar()
@@ -225,7 +274,13 @@ class MemberTab(ttk.Frame):
         self.member = self.repository.get_member(self.member_id)
         self.title_var.set(f"{self.member.member_number or '—'} · {self.member.display_name}")
         self.status_var.set(STATUS_LABELS.get(self.member.status, self.member.status.upper()))
-        date_fields = {"birth_date", "accepted_at", "membership_started_at"}
+        date_fields = {
+            "birth_date",
+            "accepted_at",
+            "membership_started_at",
+            "mandate_signed_at",
+            "mandate_revoked_at",
+        }
         for key, variable in self.variables.items():
             value = getattr(self.member, key)
             if key == "status":
@@ -303,7 +358,8 @@ class MemberTab(ttk.Frame):
 
     def _save(self) -> None:
         for key, variable in self.variables.items():
-            value = variable.get().strip()
+            raw_value = variable.get()
+            value = raw_value.strip() if isinstance(raw_value, str) else raw_value
             if key == "status":
                 value = storage_key(STATUS_LABELS, value)
             setattr(self.member, key, value)
diff --git a/src/ccma/ui/options_dialog.py b/src/ccma/ui/options_dialog.py
index 2d73a55..7e2802b 100644
--- a/src/ccma/ui/options_dialog.py
+++ b/src/ccma/ui/options_dialog.py
@@ -42,6 +42,16 @@ class OptionsDialog(tk.Toplevel):
         self.manual_numbers_var = tk.BooleanVar(value=number_policy["mode"] == "manual")
         self.number_pattern_var = tk.StringVar(value=number_policy["pattern"])
         self.number_preview_var = tk.StringVar()
+        organization = repository.get_configuration().get("organization") or {}
+        if not isinstance(organization, dict):
+            organization = {}
+        self.organization_vars = {
+            key: tk.StringVar(value=str(organization.get(key, "")))
+            for key in (
+                "name", "street", "postal_code", "city", "country", "email", "phone",
+                "website", "iban", "bic", "creditor_id",
+            )
+        }
         self.title("Optionen")
         self.geometry("900x650")
         self.minsize(760, 540)
@@ -65,16 +75,19 @@ class OptionsDialog(tk.Toplevel):
         paths = ttk.Frame(notebook, padding=16)
         appearance = ttk.Frame(notebook, padding=16)
         member_numbers = ttk.Frame(notebook, padding=16)
+        organization = ttk.Frame(notebook, padding=16)
         automation = ttk.Frame(notebook, padding=16)
         changelog = ChangelogView(notebook)
         notebook.add(paths, text="Pfade")
         notebook.add(appearance, text="Darstellung")
         notebook.add(member_numbers, text="Mitgliedsnummern")
+        notebook.add(organization, text="Verein / Absender")
         notebook.add(automation, text="Hausmeister")
         notebook.add(changelog, text="Changelog")
         self._build_paths(paths)
         self._build_appearance(appearance)
         self._build_member_numbers(member_numbers)
+        self._build_organization(organization)
         self._build_automation(automation)
 
         buttons = ttk.Frame(root)
@@ -148,6 +161,27 @@ class OptionsDialog(tk.Toplevel):
             style="Muted.TLabel",
         ).grid(row=1, column=1, sticky="w")
 
+    def _build_organization(self, parent: ttk.Frame) -> None:
+        parent.columnconfigure(1, weight=1)
+        fields = (
+            ("Vereinsname", "name"),
+            ("Straße und Hausnummer", "street"),
+            ("Postleitzahl", "postal_code"),
+            ("Ort", "city"),
+            ("Land", "country"),
+            ("E-Mail-Adresse", "email"),
+            ("Telefonnummer", "phone"),
+            ("Webseite", "website"),
+            ("IBAN", "iban"),
+            ("BIC", "bic"),
+            ("SEPA-Gläubiger-ID", "creditor_id"),
+        )
+        for row, (label, key) in enumerate(fields):
+            ttk.Label(parent, text=label).grid(row=row, column=0, sticky="w", padx=(0, 12), pady=5)
+            ttk.Entry(parent, textvariable=self.organization_vars[key], width=48).grid(
+                row=row, column=1, sticky="ew", pady=5
+            )
+
     def _build_automation(self, parent: ttk.Frame) -> None:
         parent.columnconfigure(1, weight=1)
         ttk.Checkbutton(
@@ -350,6 +384,9 @@ class OptionsDialog(tk.Toplevel):
         try:
             self.config_obj.save()
             self.repository.save_member_number_policy(mode=number_mode, pattern=number_pattern)
+            self.repository.save_organization(
+                {key: variable.get() for key, variable in self.organization_vars.items()}
+            )
         except (OSError, RepositoryError) as exc:
             messagebox.showerror("Optionen konnten nicht gespeichert werden", str(exc), parent=self)
             return
diff --git a/tests/test_repository.py b/tests/test_repository.py
index 28afb8d..4ec77d1 100644
--- a/tests/test_repository.py
+++ b/tests/test_repository.py
@@ -168,3 +168,69 @@ def test_invalid_member_number_patterns_are_rejected(pattern) -> None:
 
 def test_member_number_formatter_supports_padding_and_year() -> None:
     assert format_member_number("CCMA-{year}-{number:05d}", 42, year=2026) == "CCMA-2026-00042"
+
+
+def test_member_address_and_sepa_data_are_structured_and_audited_without_values(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Bank", last_name="Member", phone="0621 12345")
+    member.street = "Teststraße 23"
+    member.postal_code = "68159"
+    member.city = "Mannheim"
+    member.account_holder = "Bank Member"
+    member.iban = "DE89 3704 0044 0532 0130 00"
+    member.bic = "COBADEFFXXX"
+    member.mandate_reference = "CCMA-M-42"
+    member.mandate_signed_at = "21.06.2026"
+    member.mandate_active = True
+
+    repository.save_member(member)
+
+    loaded = repository.get_member(member.member_id)
+    assert loaded.iban == "DE89370400440532013000"
+    assert loaded.mandate_signed_at == "2026-06-21"
+    raw = json.loads((repository.members_root / member.member_id / "member.json").read_text())
+    assert raw["address"]["city"] == "Mannheim"
+    assert raw["banking"]["mandate_active"] is True
+    event = repository.get_events(member.member_id)[-1]
+    assert "IBAN" in event.summary
+    assert loaded.iban not in event.summary
+    assert loaded.street not in event.summary
+
+
+def test_active_sepa_mandate_requires_valid_complete_data(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Invalid", last_name="Mandate")
+    member.iban = "DE001234"
+    with pytest.raises(RepositoryError, match="IBAN"):
+        repository.save_member(member)
+
+    member.iban = "DE89370400440532013000"
+    member.mandate_active = True
+    with pytest.raises(RepositoryError, match="aktives Lastschriftmandat"):
+        repository.save_member(member)
+
+
+def test_organization_sender_data_is_stored_centrally(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    repository.save_organization(
+        {
+            "name": "Chaos Computer Club Mannheim e.V.",
+            "street": "Testweg 1",
+            "postal_code": "68159",
+            "city": "Mannheim",
+            "country": "Deutschland",
+            "email": "vorstand@example.org",
+            "phone": "",
+            "website": "https://example.org",
+            "iban": "DE89370400440532013000",
+            "bic": "COBADEFFXXX",
+            "creditor_id": "DE98ZZZ09999999999",
+        }
+    )
+
+    organization = repository.get_configuration()["organization"]
+    assert organization["street"] == "Testweg 1"
+    assert organization["iban"] == "DE89370400440532013000"