After you file

I calculated my taxes with TurboTax. 

I then remembered that I had sold some S Corp stock for $ 1,900.00. My basis in this stock was $190.00, 30 years ago. This gave me a long-term capital gain of $1,710.00.

TurboTax calculated an increase in my tax liability of $562.00. (33%).

This is clearly wrong. Any Ideas?