Get your taxes done using TurboTax

If you earned more of your income towards the end of the year, the annualized method should help.

For the annualized method, you start with the first quarter and continue adding for each quarter until the program handles the 4th quarter since that is the total for the year.

I put in quarterly amounts and you can see how the program creates an annualized income for each quarter. Next, input the tax withheld as the total for year to date. Since you are entering the information, I don't understand how it is rounding so oddly. 

Since you are on desktop, you can switch to FORMS mode and look at the forms. You will see a section for capital gains as well. Go through the forms and look for errors.

The blue boxes are the data we enter. The black boxes are what the program calculates.