I can not find a place to accurately enter an additional SEP IRA contribution and have the amount deducted from my taxable income. Customer service on turbo tax is dead.

[DawnC]

You only need to enter Simplified Employee Pension (SEP) IRA contributions made through self-employment work. If your employer made a SEP IRA contribution for you, then you don’t need to enter it in your return. (While you could contribute more to an employer-sponsored SEP IRA, TurboTax doesn’t support these contributions.)

Note: Before you enter your SEP IRA contributions, make sure you've entered your self-employed income. This allows us to calculate the maximum amount you're allowed to contribute to your SEP IRA.   For full instructions on where to enter, click this link.