Nothing has changed in the tax code or in TurboTax with regard to entering SEP contributions. TurboTax's Traditional and Roth IRA Contributions section under Deductions & Credits asks for your regular *personal* contributions to traditional IRAs. However, SEP contributions are employer contributions, not regular personal contributions, so they are *not* to be entered under Deductions & Credits. A self-employed SEP contribution is instead entered in the Self-employed retirement section explicitly as a SEP contribution.
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