Quote from @Doug Smith:
Institutional lenders typically don't allow this. They will want to "source" the down payment, meaning that they are going to want to know where it comes from. They might ask for two or three months of your bank statements to see if it has "seasoned" in your accounts for a while...meaning was it in the beginning balance of the oldest statement. If it was deposited, where did it come from? They'll want a paper trail such as a settlement statement from a property you just sold. Some might accept a gift from a family member, but they'll have to source that too. Usually, they will not allow borrowed funds or a seller concession to be the downstroke for your down payment. Default rates are exponentially higher for those who don't have their own cash in the deal. We will want to see some sort of skin in the game. I hope that helps.
Thank you for your reply. By Institutional, do you mean FHA, Conventional, or all loans outside of private lenders?