To be clear, we're talking about an unsecured loan against the corporation. That is, it is clear from the beginning that if the corporation goes bankrupt, they will not be seeing their money again.

Of course, a bank would not be interested in this; only an investor with a willingness to take a risk and some confidence in the endeavor. That is who we are talking about. I'm asking about what %annual interest is typical for an unsecured loan from such a seed investor.

We're not talking about stock because we don't have current plans to sell or go public, so stock wouldn't make sense from an investment perspective. I'm sure there have been other start ups who have been in a similar place; I'm wondering how they set it up.