For the distribution of the entire account to constitute a return of contribution, presumably this contribution was your only contribution to the Roth IRA and was made to establish the account. You can enter the 2019 Form 1099-R as if you have already received it even though you will not be receiving the form from Fidelity until early 2020. The Form will have the following
- Box 1: total amount distributed (the entire account value in this case, contribution plus earnings)
- Box 2a: the earnings amount
- Box 2b Total distribution marked
- Box 7: codes P and J
When entering this into 2018 TurboTax, be sure to indicate in the follow-up questions that this is a 2019 Form 1099-R. TurboTax will include the earnings amount in income on Form 1040 line 4b and on Form 5329 to calculate the 10% early-distribution penalty on the earnings. (If you were over age 59½ at the time of the distribution you'll need to claim and Other reason exception to the penalty on the earnings amount.)
You should also have entered the Roth IRA contribution into TurboTax under Deductions & Credits and when TurboTax indicated it was an excess contribution indicated that you had the entire contribution amount (not the distribution amount) returned. TurboTax will ask you to provide an explanation statement describing the contribution and it's return, in this case indicating the amount of contribution returned, the total amount distributed, the earnings amount included in the distribution (amount distributed minus amount contributed), that this was your only contribution ever made to the account and that the distribution closed the account.
When you receive the actual 2019 Form 1099-R in early 2020 you can ignore it. The explanation you provide with your 2018 tax return will have taken its place.
