After you file

Is there an amount on your 1040 line 24?

 

Even if Turbo Tax calculates a penalty on line 24 it is just an estimate.  It's common and expected for the IRS to send a bill for more or even send a refund.  It is determined by when the IRS actually gets your tax due payment which Turbo Tax won't know.

 

If you want to see it in the program....

It's under

Federal or Personal (for Home & Business Desktop)

Other Tax Situations

Additional Tax Payments

Underpayment Penalties - Click the Start or update button