Can anyone help? It seems I'm making a mistake when calculating tax bill.

taxable income = 75608.  Married Joint.

(75608-18650) x 15% + 1865 = 10408.7, wounds up to 10409.

Problem is, TurboTax is saying its 10411.  Where am I going wrong?  I know it's only $2 but it'll drive me crazy if I don't find out what's going on.  

Thank you.