A contribution made for 2021 from January 1, 2022, through April 18, 2022, is deemed to have been made on December 31, 2021.
No, your basis wouldn't be 11k, it is $6,000 (the after-tax contribution) unless I misunderstood and the 5k was also an after-tax (nondeductible) contribution in prior years. But I had the impression the 5k were pre-tax contributions.
If the 5k were also after-tax contributions then your basis would be $11k for prior years and none of the conversion would be taxable. But then you need to make sure that you filed Form 8606 when you made the $5,000 nondeductible contribution.
@gabsk8r
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