Underpayment penalty

I had virtually no taxable income until November when I did a Roth conversion.  I paid the tax to the IRS at this time.  Turbo Tax indicates I have an underpayment penalty because I did not pay quarterly estimated taxes.  It would seem as long as I pay the tax on the money once earned, I shouldn't have to pay a penalty for tax on money I had not yet earned.

Is Turbo Tax applying tax law correctly here?