It seems mortgage rules change frequently, below is the latest on down payment requirements. (UPDATED 11-04-2018)
For a primary residence you need a down payment of:
3.5% for an FHA Conforming loan ($453,100 or less).
3.5% for an FHA-Jumbo loan ($453,101 to $679,650, in high cost markets).
5% down for a Conventional Conforming loans ($453,100 or less).
5% down (this used to be 10% down) for a Conventional Conforming “High Balance” loan ($453,101 to $669,650, in high cost markets).
20% down payment for most Jumbo loans, or even 25% or more depending on the loan size.
An investment property typically requires a minimum of 20% down payment, although there may be options with 15% down but they would have mortgage insurance.
Investment property down payments may increase. The history of these loans is that they required 30% down when I first got in the business in 1986. In the early 2000’s during the real estate boom, this quickly went to 20% down, then 10% down, and then even 0% down for a while! Then they went back to 10% down, and currently 20% down, next stop…?
And all of these requirements are subject to change due to credit scores, property type (multifamily properties may require more down payment, for example), and more.