Yes. The accidental backdoor Roth will be nontaxable as long as the amount converted was no more than your wife's basis in nondeductible traditional IRA contribution and she had no other money in traditional IRAs on December 31, 2019. The taxable amount will be calculated on Form 8606 Parts I and II. (With nondeductible traditional IRA contributions and distributions occurring in the same year, TurboTax might do part of the calculation on a separate worksheet, indicated by asterisks on lines 13 and 15 and blank lines 6 through 12 of the Form 8606).
