Find the Cart Sub Total before discount is applied

[Jim_D]

I am trying to create a banner to show the cart sub total before discount is applied. We offer a discount after the customer hits a certain amount in the cart but if I use carttotal, the discount is already applied and give false information. 

Example.  

If the customer hit $40 they get 20% off but when the "Carttotal" is used, it show $33.60 and they need to add more to their cart to get the discount which they already got.

Does anyone have any ideas on how you find or import this information. 

Current we have {{40-carttotal}}