I meant the taxable amount of the 2018 code J distribution will be calculated on 2018 Form 8606 Part *III*, not Part IV. I was somewhat repeating what I had said in the first sentence of that paragraph. I've corrected that.
You have not received any 2016 Form 1099-R. Your Forms 1099-R are 2018 Forms 1099-R. The difference between box 1 of the code J 2018 Form 1099-R and the amount of your excess contribution for 2016 is calculated on 2018 Form 8606 Part III and is the amount of that distribution that is subject to income tax and early-distribution penalty. Make sure that Form 8606 line 22 shows your basis which includes your excess Roth IRA contribution for 2016.
