diff --git a/src/ledger/delta.go b/src/ledger/delta.go
index 929e5e9..3769719 100644
--- a/src/ledger/delta.go
+++ b/src/ledger/delta.go
@@ -41,6 +41,10 @@ func newDelta(transaction string, payee bool, d, desc, name string, v float64, c
 	}
 }
 
+func (delta Delta) ID() string {
+	return fmt.Sprintf("%.2f", delta.Value)
+}
+
 func (delta Delta) withWith(other Delta) Delta {
 	other.with = nil
 	delta.with = append(delta.with, other)