I get the following info : >> taxable income:$93,319 status : Single , income tax : $19,018. >> This looks low as per income tax rates for 2017 . How is this computed ?

The 2017 Tax Table shows exactly $19,113 for your income, so you probably have some income taxed at a different rate, such as a capital gain. 

Thanks for the reply. I do have short term capital gains (no long term capital gains) and as far as I know that should be taxed at the same rate. Will that make a difference ?

If you have capital gains, even if from a 1099-DIV, your tax is calculated on a worksheet instead of using the tables. When you print your return, if you ask for all forms and worksheets, you'll see a capital gains tax worksheet and can see your calculation there.  There are actually 7 different method that can be used to calculate your tax.  You have to see which method was used on your return.

Hi,

This was actually caused because my dividends were actually listed as 'qualified dividends' and hence were subject to a lower income tax rate of 15%.

Thanks