In desktop the question flow after inputting the contribution is as follows, asks about non-deductible at the end...
Did you recharacterize any of the traditional IRA contributions for 2025 over to a Roth IRA contribution?
Are you covered by a retirement plan at work?
Did you contribute more money to this IRA than was allowed in 2024 or any previous year?
Nondeductible contributions are tracked on Form 8606 in your prior year returns.
If you made any nondeductible contributions in prior years, look at your most recent Form 8606. Find the box called total basis and enter the number from that box below.
If you never filed a Form 8606 just enter 0 (zero).
What was your total basis as of December 31, 2024?
You have the option of making all or part of your deductible IRA contributions nondeductible. Why do this? Although this would be uncommon, a possible advantage of this option is to make future IRA withdrawals tax-free. (Earnings on contributions while in the IRA will still be taxable at withdrawal.)
