I'm not sure what to tell you. That's the calculation TurboTax is banking on and has built the entire system around.
While it seems unlikely to me that the computer is wrong I suppose anything is possible so maybe you should hedge your bet?
You owe anyway so go ahead and mail the return in with an additional $147 included in the amount. If TurboTax is right you get a refund of $147 bucks down the road.
If TurboTax is wrong you have paid the taxes, you'll receive a letter from the IRS telling you that everything is square and you'll have a seriously good claim under the accuracy guarantee.
Good luck!
@Jtmanhart
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