You will receive a higher allowance for gift funds, seller concessions, etc. on your primary residence vs. an investment property.

It is a gift, when it happens.)What are income tax considerations?

My parent's provided me with a cash gift to help me reach the 20% down payment threshold.

If he accepts such terms it would basically a partial gift as he could do far better return with less risk.  

He just put in about $15,000 worth of Windows last year but romantically reduce the heating costs here in the Northwoods.

The difference in what I needed to have saved and prepared for the purchased changed by several thousand dollars, and a lot don't allow "gifts" or unsecured LOCs to help --- so like I said... be very clear and ask a lot of questions, and be prepared for hurdles along the way.

I also heard him on BP podcast 169 mention how he uses extra income from job or note investing to pay down mortgages faster.My first instinct would be that a 3% mortgage locked in for 30yrs on a cash-flowing asset is a gift and you want to keep it as long as possible to basically short the dollar (betting on future inflation, meaning dollars you will have to pay the loan back with in the future will be less valuable).

With conventional the down payment can’t be borrowed or gifted.

But we made our deals.Much like my fuller brush days  of offering a free gift of lanolin hand lotion to every door I knocked. 

My team and I are in the area sharing with this community around distressed properties in the shifting real estate market, and we are offering some reading material on options to foreclosure as well as offering a starbucks gift card for exchange of answering questions in a survey on distressed properties in general.