I sold a residence in California in 2017. It was my primary residence till I moved out of the state in 2015. How is this taxed since I'm no longer a CA resident?

[rob-scott]

The house was my primary residence for more than 5 years until I left California in 2015.  I had roughly a $1M gain after deducting initial purchase price and property improvements.  As I am no longer a CA resident, do I still have to pay CA capital gains taxes?  If so, can I pre-pay them in 2017 and take some benefit on my 2017 federal tax calculations?

[TomD8]

You still must pay CA capital gains taxes.  California taxes non-residents on capital gains from the sale of property located in California.  See page 7 of this reference:  https://www.ftb.ca.gov/forms/2016/16_1031.pdf

On your federal return, state income taxes are deductible in the year actually paid.