An 80-10-10 mortgage consists of two mortgages: the first is a fixed-rate loan of 80% of the value of the home; the second - 10% as a loan secured by equity capital; and the remaining 10% as a down payment in cash.
Choice 83(b) is an Internal Revenue Code (IRC) provision that gives an employee or startup founder the ability to pay taxes on the total fair market value of the restricted shares at the time of grant.