diff --git a/abrechenbarkeit.lua b/abrechenbarkeit.lua
index f5b48a0..b7636a1 100755
--- a/abrechenbarkeit.lua
+++ b/abrechenbarkeit.lua
@@ -530,7 +530,11 @@ local function r_log(filter)
     end)
 end
 
-local function r_users(show_special)
+local function r_users(show_special, filter_negative)
+	if filter_negative ~= nil then
+		filter_negative = tonumber(filter_negative) or 0
+	end
+
     return respond(200, "Abrechenbarkeit", function()
 		local users = get_active_users()
     
@@ -579,7 +583,8 @@ local function r_users(show_special)
         local show_user = function(user)
             local is_spu = user.name:sub(1, 1) == "@"
             local filter_out = query.prefix ~= nil and user.name:sub(1, 1):lower() ~= query.prefix
-            if is_spu == show_special and not filter_out then
+            if (filter_negative ~= nil and user.balance < filter_negative)
+            	or (filter_negative == nil and is_spu == show_special and not filter_out) then
                 print(format([[<li>
                     <a href="/{username_url}">
                         <span class="name">{!username}</span>
@@ -793,15 +798,12 @@ if path == "/" then
     elseif query.create_user then
         return r_create_user()
     elseif query.spus then
-        return r_users(true)
-    elseif query.users then
-        if query.export then
-            return r_export_balances()
-        else
-            return r_users(false)
-        end
+        return r_users(true, nil)
+    elseif query.users and query.export then
+		return r_export_balances()
     else
-        return r_users(false)
+        return r_users(false, query.negative)
+        -- tonumber(query.negative or 0) or nil)
     end
 else
     local username = extract_username()