Is NIA from removal of excess Roth IRA taxable 2016 or 2017?

I had excess Roth IRA contribution for 2016. I have removed the contribution prior to filing my tax return.  The Net Income Attributable (NIA) was also distributed. I am under 59 1/2.

  1. Is the NIA distribution taxable, or can it be considered removal of contributed funds (the Roth IRA has contributions from prior years). 
  2. If it is taxable, is it reported in 2016 (same year as the excess contribution) or 2017 (year the distribution was made)?
  3. If taxable in 2016 how to I report without a 1099-R?