If you don't want the money contributing to equity, you're most likely looking at a loan. Just write some legible words stating that this is a loan and email it

If you don't want the money contributing to equity, you're most likely looking at a loan. Just write some legible words stating that this is a loan and email it around with the other guy agreeing to it. I only know from experience from incorporating an LLC. If it's anything else (S/C -corp) then I have no idea.