Line 23 of Form 1040 is Other taxes, including self-employment taxes, from Schedule 2, line 21. Review Schedule 2 to check why you are getting an additional tax. Did you have an early distribution of your retirement distribution? What's the distribution code in box 7?
To preview your Form 1040 before you file, refer to the TurboTax articles How do I preview my TurboTax Online return before filing? and How do I preview my return in the TurboTax Desktop software
Refer to the TurboTax Help article How does a retirement plan withdrawal (Form 1099-R) affect my taxes? for additional information.
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