diff --git a/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableTransaction.java b/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableTransaction.java
index 3be30215..9d3306aa 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableTransaction.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableTransaction.java
@@ -29,6 +29,7 @@ package org.mustangproject.ZUGFeRD;
 
 import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
+import java.math.BigDecimal;
 import java.util.Date;
 
 public interface IZUGFeRDExportableTransaction {
@@ -257,4 +258,12 @@ public interface IZUGFeRDExportableTransaction {
 	 * @return the IssueDateTime in format CCYY-MM-DDTHH:MM:SS
 	 */
 	default String getBuyerOrderReferencedDocumentIssueDateTime() { return null; }
+
+	/**
+	 * get the TotalPrepaidAmount located in SpecifiedTradeSettlementMonetarySummation (v1) or
+	 * SpecifiedTradeSettlementHeaderMonetarySummation (v2)
+	 * @return the total sum (incl. VAT) of prepayments, i.e. the difference between GrandTotalAmount
+	 * and DuePayableAmount
+	 */
+	default BigDecimal getTotalPrepaidAmount() { return BigDecimal.ZERO; }
 }
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDTransactionModelConverter.java b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDTransactionModelConverter.java
index 6610f0f2..e8ca6841 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDTransactionModelConverter.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDTransactionModelConverter.java
@@ -659,9 +659,14 @@ class ZUGFeRDTransactionModelConverter {
 		grandTotalAmount.setValue(currencyFormat(totals.getTotalGross()));
 		monetarySummation.getGrandTotalAmount().add(grandTotalAmount);
 
+		AmountType totalPrepaidAmount = xmlFactory.createAmountType();
+		totalPrepaidAmount.setCurrencyID(currency);
+		totalPrepaidAmount.setValue(currencyFormat(trans.getTotalPrepaidAmount()));
+		monetarySummation.getTotalPrepaidAmount().add(totalPrepaidAmount);
+
 		AmountType duePayableAmount = xmlFactory.createAmountType();
 		duePayableAmount.setCurrencyID(currency);
-		duePayableAmount.setValue(currencyFormat(totals.getTotalGross()));
+		duePayableAmount.setValue(currencyFormat(totals.getTotalGross().subtract(trans.getTotalPrepaidAmount())));
 		monetarySummation.getDuePayableAmount().add(duePayableAmount);
 
 		return monetarySummation;