A backdoor Roth is a conversion and will reduce your basis in the traditional IRA.
The nondeductible traditional IRA contribution increases your basis in the traditional IRA and then when you convert it to the Roth IRA (remove it from the traditional IRA) then the basis in your traditional IRA is reduced by this amount (assuming your traditional IRA is empty at the end of each year and you don't have any pre-tax funds or earnings).
@vikas_217
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