diff --git a/Elwig/Helpers/Billing/BillingVariant.cs b/Elwig/Helpers/Billing/BillingVariant.cs
index 3b41ef3..3afafdb 100644
--- a/Elwig/Helpers/Billing/BillingVariant.cs
+++ b/Elwig/Helpers/Billing/BillingVariant.cs
@@ -104,18 +104,21 @@ namespace Elwig.Helpers.Billing {
             if (App.Client.IsMatzen) {
                 var lastYears = 3;
                 var multiplier = 0.50;
+                var includePredecessor = true;
                 var modName = "Treue%";
                 await AppDbContext.ExecuteBatch(cnx, $"""
                     INSERT INTO payment_member (year, avnr, mgnr, net_amount, mod_abs, mod_rel)
                     SELECT c.year, {AvNr}, s.mgnr, 0,
                            ROUND(s.sum * COALESCE(m.abs, 0)),
                            COALESCE(m.rel, 0)
-                    FROM (SELECT {Year} AS year, mgnr,
-                                 ROUND(AVG(sum) * {multiplier}) AS baseline,
-                                 COUNT(*) = {lastYears} AND MIN(sum) > 0 AS allowed
-                          FROM v_stat_member
-                          WHERE year > {Year} - {lastYears}
-                          GROUP BY mgnr
+                    FROM (SELECT {Year} AS year, m.mgnr,
+                                 ROUND(AVG(COALESCE(a.sum, b.sum)) * {multiplier}) AS baseline,
+                                 COUNT(*) = {lastYears} AND MIN(COALESCE(a.sum, b.sum)) > 0 AS allowed
+                          FROM member m
+                              LEFT JOIN v_stat_member a ON a.mgnr = m.mgnr
+                              FULL OUTER JOIN v_stat_member b ON b.mgnr = m.predecessor_mgnr AND b.year = a.year AND {(includePredecessor ? "TRUE" : "FALSE")}
+                          WHERE a.year > {Year} - {lastYears}
+                          GROUP BY m.mgnr
                           HAVING allowed) c
                         JOIN v_stat_member s ON (s.year, s.mgnr) = (c.year, c.mgnr)
                         LEFT JOIN modifier m ON m.year = c.year AND m.name LIKE '{modName}'