Q1. You didn't make the conversion in 2021 therefore you will only have your basis of $6,000 on lines 1, 3, and 14 of your 2021 Form 8606. On your 2022 Form 8606 line 8 will be entered unless you have to use Worksheet 1-1. Figuring the Taxable Part of Your IRA Distribution. Please see Reporting your nontaxable distribution on Form 8606. TurboTax does this automatically.
Q2. The IRS knows that you converted the contribution for 2021 in 2022 because of your Form 1099-R and Form 5498.
Q3. Please be aware, you only enter line 4 if you made a conversion in that year. And of course, you can't convert in 2022 funds that were contributed in 2023 for 2022. Therefore, the basis will be reduced by that amount to calculate the taxable portion of the 2022 conversion.
Yes, your basis on line 14 of your 2022 Form 8606 will carry over to line 2 of your 2023 Form 8606.
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