@shubham1310 , your 2023 Form 8606 will have $4 on line 14 that will carry forward to line 2 of your 2024 Form 8606 to be added to your, say, $7,000 nondeductible traditional IRA contribution for 2024, resulting in $7,004 of basis to be applied to your $7,004 conversion for 2024 (assuming no interest deposited into the traditional IRA after the conversion that would result in a nonzero 2024 year-end balance in traditional IRAs).
