When you filed your return with TurboTax did you specifically give the date you received the income from the gib job? Because you would've owed estimated tax for the one quarter (4th quarter). Otherwise, i think TurboTax will say you received it across all four quarters by default. And check the messages on this thread. On Form 2210, it says not to send in the form unless you wish to request a waiver. But i am sorta surprised the IRS responded as fast as they did with a refund no less.
