If you have earnings or pre-tax funds in the traditional IRA and the value on December 31, 2021, isn't $0 then the pro-rata rule applies. This means that with each distribution/ conversion you will have a taxable and nontaxable part. You can see the calculations either on Form 8606 lines 6-12 or on the Taxable IRA Distribution Worksheet.
You can see the remaining basis on line 14 of Form 8606, this basis can be carried forward. Therefore each distribution/conversion in the future will have a taxable and nontaxable part until the basis is all used.
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