Investors & landlords

No, TurboTax imports the information that is provided by the broker on the 1099-B, they don't "add" anything to it. 

That being said, in nearly all cases where a broker charges commission, they add the commission to the basis of the stock, so it is already on your 1099-B.

If you have sales on a 1099-B and you are certain that you were charged commission and it was not included on your 1099-B, this is how to enter it in TurboTax:

1. Select Federal from the left side menu.
2. Select Wages & Income toward the top left.
3. Scroll down the list and look for Investment Income.
4. Find Stocks, Mutual Funds, Bonds, Other and click on Start or Update to the right. 
5. On the screen titled,  Did you get a 1099-B or brokerage statement for these sales? answer Yes.
6. On the screen titled, Tell us about this sale, answer I'll enter one sale at a time.
7. Fill in your information about the sale.
8. On the next screen Let us know if any of these situations apply to this sale, check the first box and enter the amount of the commission on the sale.