diff --git a/lib/gnucash/account.rb b/lib/gnucash/account.rb
index 8b5781b..f8d7bcd 100644
--- a/lib/gnucash/account.rb
+++ b/lib/gnucash/account.rb
@@ -33,5 +33,11 @@ module Gnucash
         value: value,
       }
     end
+
+    def finalize
+      @transactions.sort! do |a, b|
+        a[:txn].date <=> b[:txn].date
+      end
+    end
   end
 end
diff --git a/lib/gnucash/book.rb b/lib/gnucash/book.rb
index 42710dd..6c6a6f2 100644
--- a/lib/gnucash/book.rb
+++ b/lib/gnucash/book.rb
@@ -15,6 +15,7 @@ module Gnucash
       @book_node = book_nodes.first
       build_accounts
       build_transactions
+      finalize
     end
 
     def find_account_by_id(id)
@@ -34,5 +35,11 @@ module Gnucash
         Transaction.new(self, txn_node)
       end
     end
+
+    def finalize
+      @accounts.each do |account|
+        account.finalize
+      end
+    end
   end
 end
diff --git a/lib/gnucash/transaction.rb b/lib/gnucash/transaction.rb
index a472acf..275ee00 100644
--- a/lib/gnucash/transaction.rb
+++ b/lib/gnucash/transaction.rb
@@ -1,5 +1,6 @@
 module Gnucash
   class Transaction
+    attr_accessor :date
     attr_accessor :value
     attr_accessor :id