Click the Continue button on the page that lists the From 1099-R that you have entered, answer Yes when TurboTax asks if you made nondeductible contributions, then enter the $4,000 of basis in nondeductible traditional IRA contributions. If you had a nonzero balance in any traditional IRAs at the end of 2023, also be sure to, when asked, enter your year-end value in traditional IRAs.
