you don't! the iRA contribution was the deduction in 2023 or if it was a non-deductible 2023 contribution then there is no deduction in 2024.
When you move funds from a nondeductible IRA to your employer’s 401(k), the tax consequences can vary. Generally, if you perform a direct rollover, where the funds are transferred directly from the IRA to the 401(k), there are no immediate tax consequences. This means the money is not considered taxable income at the time of the transfer.
However, it’s important to note that the 401(k) plan must allow for such rollovers, and the contributions must be from after-tax dollars to avoid double taxation. You should also report the rollover on your tax return, even though it’s not a taxable event. (double taxation tax omn the movement to the 4101(K) and you get no basis in the 4001(k) so when withdrawn your taxed again.
