Get your taxes done using TurboTax

I'm having the same issue. I have a return in TurboTax that's saying the tax is $270 or 15.6% of taxable income. But the IRS tax table says $174, and TaxSlayer also says $174. Why is TurboTax not using the tax table? I'm an accountant as well. Please advise! I'd like to use TurboTax, but it's calculating federal tax using the blended rate and $100 more in taxes.