How much down payment actually protects a seller carrying financing

When structuring seller financing, the down payment size is often treated as the main protection, but it's worth separating what the cash at closing actually does from what the note terms do. The case for a larger down payment, in the 20 to 25 percent range, is straightforward. It's the clearest thing standing between a seller and a buyer who mails back the keys the first time a major repair comes up, since a buyer with real cash in the deal has something to lose by walking away. If the deal does go bad, that equity cushion gives the seller room to absorb foreclosure costs and still come out whole. The case for a smaller down payment, in the 5 to 10 percent range, is about who seller financing actually serves. The reason owner financing sells a property in the first place is that the pool of buyers who can write a 25 percent check is small, and most of those buyers can simply go to a bank instead. Insisting on a bank-sized down payment gives up the wider buyer pool that makes carrying the paper worthwhile to begin with. The alternative is pricing the accommodation into the terms instead of the down payment: a higher rate, a higher price, or tighter payment terms and covenants in the note. The honest answer to which one is doing the actual protecting is that they're not interchangeable. Cash at closing protects against walkaway risk on day one. Terms in the note protect the seller's position over the life of the loan. A seller taking a smaller down payment should expect to lean harder on the note itself, tighter default triggers, a real acceleration clause, and a rate that compensates for the added risk, rather than assuming the terms alone can substitute for a large down payment.