How can I have my IRA contribution be treated as nondeductible and shown on Form 8606?

We'll automatically calculate whether an IRA contribution is deductible or nondeductible. On the W-2 screen, there is a checkbox that asks if you are covered by a retirement plan at work. If you check that box and your income is above the threshold for being able to deduct an IRA contribution, then the IRA contribution will be treated as nondeductible and be shown on Form 8606.

You can also choose to make otherwise deductible contributions nondeductible on the Taking the IRA Deduction screen.