diff --git a/src/main.rs b/src/main.rs
index 138f445..b5a400f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -117,11 +117,8 @@ pub(crate) trait Spendings {
             .sum()
     }
 
-    fn contributions(&self, archive: &BTreeMap<ReportDate, Report>) -> PossibleContributions {
-        let total_spendings = self.total_spendings();
-        let total_earnings = self.earnings().total();
-
-        let (historic_spendings, count) = std::iter::once(total_spendings)
+    fn main_account(&self, archive: &BTreeMap<ReportDate, Report>) -> (f64, u8) {
+        let (historic_spendings, count) = std::iter::once(self.total_spendings())
             .chain(
                 match self.date() {
                     Some(date) => {
@@ -143,7 +140,13 @@ pub(crate) trait Spendings {
                 (acc + spending, count + 1)
             });
 
-        let main_account = historic_spendings / count as f64;
+        (historic_spendings / count as f64, count)
+    }
+
+    fn contributions(&self, archive: &BTreeMap<ReportDate, Report>) -> PossibleContributions {
+        let total_earnings = self.earnings().total();
+
+        let (main_account, count) = self.main_account(archive);
         let main_factor = main_account / total_earnings;
 
         let mut remaining = self.earnings();