Your basis is your nondeductible contribution to the traditional IRA. For example, if you contributed $6,000 for 2021 and made it nondeductible then TurboTax will create Form 8606 to report your basis. The basis for your 2021 nondeductible contribution is on line 1. If you had a prior year basis this is entered on line 2. Your total basis in traditional IRAs for 2021 and earlier years at the end of 2021 you will find on line 14 (this will be carried over to 2022 or enter it when asked about your basis before 2022 next year).
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