diff --git a/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mapper/MustangMapper.kt b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mapper/MustangMapper.kt
index d4959ce..25322ff 100644
--- a/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mapper/MustangMapper.kt
+++ b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mapper/MustangMapper.kt
@@ -2,11 +2,7 @@ package net.codinux.invoicing.mapper
 
 import net.codinux.invoicing.model.LineItem
 import net.codinux.invoicing.model.Party
-import org.mustangproject.Contact
-import org.mustangproject.Invoice
-import org.mustangproject.Item
-import org.mustangproject.Product
-import org.mustangproject.TradeParty
+import org.mustangproject.*
 import org.mustangproject.ZUGFeRD.IExportableTransaction
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableItem
 import java.time.Instant
@@ -34,13 +30,19 @@ class MustangMapper {
         party.name, party.street, party.postalCode, party.city, party.countryIsoCode
     ).apply {
         this.taxID = party.vatId
-        // TODO: ID?
         // TODO: description?
 
         this.email = party.email
         this.setContact(Contact(party.contactName, party.phone, party.email).apply {
             this.fax = party.fax
         })
+
+        party.bankDetails?.let {
+            this.addBankDetails(BankDetails(it.accountNumber, it.bankCode).apply {
+                accountName = it.accountHolderName
+                // TODO: there's currently no field for financialInstitutionName in Zugferd model even though it exists on CII and UBL
+            })
+        }
     }
 
     fun mapLineItem(item: LineItem): IZUGFeRDExportableItem = Item(
diff --git a/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/BankDetails.kt b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/BankDetails.kt
new file mode 100644
index 0000000..eaeeea9
--- /dev/null
+++ b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/BankDetails.kt
@@ -0,0 +1,17 @@
+package net.codinux.invoicing.model
+
+class BankDetails(
+    /**
+     * In the EU / SEPA area the IBAN
+     */
+    val accountNumber: String,
+    /**
+     * In the EU / SEPA area the BIC. Optional for countries like Germany
+     */
+    val bankCode: String? = null,
+
+    val accountHolderName: String? = null,
+    val financialInstitutionName: String? = null
+) {
+    override fun toString() = "${accountHolderName ?: financialInstitutionName ?: ""} ${bankCode ?: ""} $accountHolderName"
+}
\ No newline at end of file
diff --git a/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/Party.kt b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/Party.kt
index 856065f..0b5c64c 100644
--- a/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/Party.kt
+++ b/e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/model/Party.kt
@@ -18,9 +18,12 @@ class Party(
 
     // actually there can be multiple contacts in eInvoice data model, all containing an email, phone, fax and contact name
     val email: String? = null,
-    var phone: String? = null,
-    var fax: String? = null,
-    var contactName: String? = null,
+    val phone: String? = null,
+    val fax: String? = null,
+    val contactName: String? = null,
+
+    // actually there can be multiple bankDetails in eInvoice data model
+    val bankDetails: BankDetails? = null,
 ) {
     override fun toString() = "$name, $city"
 }
\ No newline at end of file
diff --git a/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/test/DataGenerator.kt b/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/test/DataGenerator.kt
index c2d114f..d422546 100644
--- a/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/test/DataGenerator.kt
+++ b/e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/test/DataGenerator.kt
@@ -1,5 +1,6 @@
 package net.codinux.invoicing.test
 
+import net.codinux.invoicing.model.BankDetails
 import net.codinux.invoicing.model.Invoice
 import net.codinux.invoicing.model.LineItem
 import net.codinux.invoicing.model.Party
@@ -21,6 +22,9 @@ object DataGenerator {
     const val SenderVatId = "DE12345678"
     const val SenderEmail = "working-class-hero@rock.me"
     const val SenderPhone = "+4917012345678"
+    const val SenderAccountId = "DE00123456780987654321"
+    const val SenderBankCode = "12345678"
+    const val SenderAccountHolderName = "Manuela Musterfrau"
 
     const val RecipientName = "Untertänigster Leistungsempfänger"
     const val RecipientStreet = "Party Street 1"
@@ -42,7 +46,8 @@ object DataGenerator {
     fun createInvoice(
         invoiceNumber: String = InvoiceNumber,
         invoicingDate: LocalDate = InvoicingDate,
-        sender: Party = createParty(SenderName, SenderStreet, SenderPostalCode, SenderCity, SenderCountry, SenderVatId, SenderEmail, SenderPhone),
+        sender: Party = createParty(SenderName, SenderStreet, SenderPostalCode, SenderCity, SenderCountry, SenderVatId, SenderEmail, SenderPhone,
+            bankDetails = BankDetails(SenderAccountId, SenderBankCode, SenderAccountHolderName)),
         recipient: Party = createParty(RecipientName, RecipientStreet, RecipientPostalCode, RecipientCity, RecipientCountry, RecipientVatId, RecipientEmail, RecipientPhone),
         items: List<LineItem> = listOf(createItem()),
         dueDate: LocalDate? = DueDate,
@@ -60,8 +65,9 @@ object DataGenerator {
         email: String? = SenderEmail,
         phone: String? = SenderPhone,
         fax: String? = null,
-        contactName: String? = null
-    ) = Party(name, streetName, postalCode, city, country, vatId, email, phone, fax, contactName)
+        contactName: String? = null,
+        bankDetails: BankDetails? = null
+    ) = Party(name, streetName, postalCode, city, country, vatId, email, phone, fax, contactName, bankDetails)
 
     fun createItem(
         name: String = ItemName,