diff --git a/tabs/post/core.lua b/tabs/post/core.lua
index 332cd8f..9f1980c 100644
--- a/tabs/post/core.lua
+++ b/tabs/post/core.lua
@@ -363,11 +363,11 @@ function update_item_configuration()
         stack_count_slider.editbox:SetNumber(stack_count_slider:GetValue())
 
         do
-            local deposit_factor = UnitFactionGroup'npc' and .05 or .25
+            local deposit_factor = 0.025
             local duration_factor = UIDropDownMenu_GetSelectedValue(duration_dropdown) / 120
             local stack_size, stack_count = selected_item.max_charges and 1 or stack_size_slider:GetValue(), stack_count_slider:GetValue()
-            local amount = floor(selected_item.unit_vendor_price * deposit_factor * stack_size) * stack_count * duration_factor
-            amount = floor(amount * 0.6) --according to nelethor this should be more accurate, would like to get accurate fee eventually
+            local max_stack = selected_item.max_stack
+            local amount = floor(selected_item.unit_vendor_price * stack_size * duration_factor * (1 + (max_stack - stack_size) * 0.05) * deposit_factor) * stack_count
             deposit:SetText('Deposit: ' .. money.to_string(amount, nil, nil, aux.color.text.enabled))
         end