Every vendor in this category has its own vocabulary, and most of it is written for other vendors. This glossary is written for the person standing at the counter. Short definitions, no jargon laundering, and a straight answer about what each thing actually costs you when you get it wrong.
A financing waterfall is a system that routes a single customer credit application through multiple lenders in sequence, so that a shopper declined by the first lender is automatically passed to the next one without filling out another application.
The customer applies once. The platform sends that application to a prime lender first, because prime carries the best terms for the shopper. If the prime lender declines, the application drops to the next tier automatically and in real time. It keeps falling until someone approves or the tiers are exhausted.
A complete waterfall runs six tiers:
The shopper sees one application and one answer. The complexity stays on the platform side.
A single prime lender approves roughly 35% of applicants at a typical independent store. Everyone else hears no and walks. A full waterfall pushes approval coverage to 70-90%, because each tier underwrites differently - a file that fails a 700-score cutoff can clear comfortably one tier down.
The money at stake is not the financing revenue. It is the sale. A declined customer standing in your showroom has already chosen the product. Losing them is losing a ticket you had already earned.
It is not a prequalification tool. A prequal tells you what might happen; a waterfall completes the transaction. It is also not a single lender with multiple products - that is one underwriting box with different labels on it, and a decline is still a decline.