I have done the math on many different combinations with Kubota. The cash and credit price difference, when present, still considerably favor using the credit IF you have excellent credit. Straight up, you will pay less with zero percent than you would paying the interest. That is an even better deal if you have the foresight to use safe investments. In reality, the cash 'discount' is just a reduction of the cash penalty to mollify the buyer who insists on cash. If you have less than excellent credit, you may be better off using cash...every lender defines excellent differently, but typically, 800+ scores (average the 3 big credit bureaus) will almost always get you there.