Yes, there is a way to deduct SEP-IRA contributions using TurboTax when you have self-employed income.
Use the steps below to go to the self-employed retirement section of your return. Go through the screens until you get to the question regarding making a contribution to a SEP where you will indicate that you have (or are) contributed. Then, there will be a check-box beside the entry for the amount you contributed or plan to contribute. The box is labeled Maximize. Checking the box will allow TurboTax to calculate the maximum that you can contribute based on your business income.
For more information about how to make the maximum contribution calculation on your own, Click Here.