The corrective distribution would have included the excess contribution and the earnings attributed to that amount. If the contributions were made pre-tax, the employer must issue a corrected W-2 for that tax year to show the excess deferral amount as taxable wages (in Box 12). This is June, so that should have already happened. The earnings are added to the taxable income for the year the excess amount is distributed, but that 1099-R won’t come out until after the end of this year, coded as applicable to the previous tax year. You can use the 1099-R input as if you have one in hand.