TurboTax is asking for the amount that remained in your traditional IRAs on December 31, 2021. TurboTax uses this amount to calculate on form 8606 Part I the taxable amount of your Roth conversion when you have basis in nondeductible traditional IRA contributions. If you have no basis in nondeductible traditional IRA contributions, TurboTax won't need this information and won't need to prepare Form 8606 Part I, but TurboTax always asks in case you make entries later that indicate that you have such basis. In either case, TurboTax will prepare Form 8606 Part II to report the Roth conversion.