Read the link you provided here more carefully. Do you see -- for one thing-- that the interest is compounded daily? TurboTax never knows how, when or even if you pay your tax due, so TT is not going to calculate your interest when you are late. Only the IRS does that, based on when they receive your late tax return and your late payment of the tax due as shown on the Form 1040.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
