diff --git a/libgnucash/engine/gncBillTerm.c b/libgnucash/engine/gncBillTerm.c
index fb6f2bb15c..844a2e398b 100644
--- a/libgnucash/engine/gncBillTerm.c
+++ b/libgnucash/engine/gncBillTerm.c
@@ -838,14 +838,28 @@ static void _gncBillTermCreate (QofBook *book)
     qof_book_set_data (book, _GNC_MOD_NAME, bi);
 }
 
+
+static void
+destroy_billterm_on_book_close (QofInstance *ent, gpointer data)
+{
+    GncBillTerm *term = GNC_BILLTERM(ent);
+
+    gncBillTermBeginEdit (term);
+    gncBillTermDestroy (term);
+}
+
 static void _gncBillTermDestroy (QofBook *book)
 {
     struct _book_info *bi;
+    QofCollection *col;
 
     if (!book) return;
 
     bi = qof_book_get_data (book, _GNC_MOD_NAME);
 
+    col = qof_book_get_collection (book, GNC_ID_BILLTERM);
+    qof_collection_foreach (col, destroy_billterm_on_book_close, NULL);
+
     g_list_free (bi->terms);
     g_free (bi);
 }
diff --git a/libgnucash/engine/gncTaxTable.c b/libgnucash/engine/gncTaxTable.c
index 3cd689db5c..23f195a648 100644
--- a/libgnucash/engine/gncTaxTable.c
+++ b/libgnucash/engine/gncTaxTable.c
@@ -1015,14 +1015,27 @@ static void _gncTaxTableCreate (QofBook *book)
     qof_book_set_data (book, _GNC_MOD_NAME, bi);
 }
 
+static void
+destroy_taxtable_on_book_close (QofInstance *ent, gpointer data)
+{
+    GncTaxTable *table = GNC_TAXTABLE(ent);
+
+    gncTaxTableBeginEdit (table);
+    gncTaxTableDestroy (table);
+}
+
 static void _gncTaxTableDestroy (QofBook *book)
 {
     struct _book_info *bi;
+    QofCollection *col;
 
     if (!book) return;
 
     bi = qof_book_get_data (book, _GNC_MOD_NAME);
 
+    col = qof_book_get_collection (book, GNC_ID_TAXTABLE);
+    qof_collection_foreach (col, destroy_taxtable_on_book_close, NULL);
+
     g_list_free (bi->tables);
     g_free (bi);
 }