diff --git a/rechnung.sh b/rechnung.sh
index f3fc5e5..51c8719 100755
--- a/rechnung.sh
+++ b/rechnung.sh
@@ -207,10 +207,15 @@ set_value() {
 
 make_invoice() {
 
+    local dead_days="14"
+    if [ $(date +%u) -gt 5 ]; then
+	dead_days="16"
+    fi
+    
     local month_ascii=$(date '+%B')
     local inv_day=$(date '+%j')
     local inv_date=$(date '+%Y%m%d')
-    local inv_dead=$(date -d '+14days' +%d.%m.%Y)
+    local inv_dead=$(date -d "+${dead_days}days" +%d.%m.%Y)
     local rechnungsnummer="$inv_date-$LFDNR"
     local subject="Rechnung zu $SHORT"
     local filename="$(date '+%Y%m%d')_Rechnung_$(echo "$month_ascii")_$(echo "$KUNDE" | $TR_BIN " " "_").ltx"