Unless the first time you bought a home was through a special first time homebuyer loan program with discounted interest rates, your 2nd, 3rd, 4th, etc. purchase of a primary residence should have the same interest rate as your 1st purchase of a primary residence (assuming interest rates never actually change - which we all know isn't true).
If you were going to be buying a home as a 2nd home, as in a vacation home or a commuter residence, then the interest rate is the same as if you are buying a primary residence.
If you were buying an investment property, for the same rate as on a primary residence expect to pay 1.75% (25%) down) to 3.75% (less than 25% down) more in "points" (and even more if it's a multi-unit property).
With conforming financing, interest rates are primarily dependent on:
- Loan amount (high balance conforming vs. regular conforming)
- Credit score
- Purpose (purchase, refinance with cash out, refinance without cash out)
- Occupancy (primary residence, second home, investment property)
- Property type (single family house, condo, 2-4 units, etc.)... more