topic Do I need to calculate cost basis separately ? in Get your taxes done using TurboTax

Do I need to calculate cost basis separately ?

pjdu — Mon, 09 Mar 2026 05:06:33 GMT

Hello TurboTax Community,

I sold my company stocks RSU and ESPP( Employee Stock Purchase Program ) in 2021. They withheld some stocks for tax during RSU vesting.

I also sold my previous company stocks. I see a number entered for Gain/Loss in the previous company's 1099 B. But not in the 1099 B from my current company stocks sale. I see the proceeds and cost basis entries in my current company's 1099B. How would I correctly enter the information from 1099 B to turbotax?

Thank you in advance.

Re: Do I need to calculate cost basis separately ?

FangxiaL — Thu, 24 Feb 2022 02:57:15 GMT

You should receive supplemental information on your 1099-B transactions. It is best to enter your transactions one by one to make the adjustments in the cost basis of each sale.

For help, see Entering RSUs in TurboTax.

Re: Do I need to calculate cost basis separately ?

pjdu — Thu, 24 Feb 2022 09:48:59 GMT

Thank you for the reply, I didn't receive any supplemental form. I only have 1099 B with the following columns:

Box 1a Description of property

Box 1b Date acquired

Box 1c Date sold or disposed

Box 1d Proceeds

Box 1e Cost or other basis

Box 1f Accrued market discount

Box 1g Wash sakes loss disallowed

Box 3 Proceeds from Collectibles

Box 4 Federal income tax withheld

Box 5 Noncovered security

Box 7 Loss is not allowed based on amount in 1d

Box 14 State name

Box 15 State identification no.

Box 16. State tax withheld

Out of these, I only see value for 1a, 1b, 1c, 1d, 1e, 6

Re: Do I need to calculate cost basis separately ?

DianeW777 — Thu, 24 Feb 2022 14:48:07 GMT

Perhaps. If the stock basis on the 1099-B does not seem correct (quite likely) then you need to calculate the basis. The following information may be helpful for you. For RSUs this is how the basis is determined.

It appears that you've been awarded some amount of your employer's stock and the "fair market value" of the award, (or, if you paid something for the stock, the "spread" between the amount you paid and the "fair market value" of the award), has been reported as compensation on your W-2.

The income that was included in the W2 is part of (possibly totally) the cost basis of the stock. Review the documents to see what the fair market value )FMV) was on the date of exercise or vested (and amount actually paid on that date if applicable) along with the difference of FMV. OR the vested amount included in the W2, box 12. Divide this by the number of shares you received then multiply this by the shares sold to arrive at your cost basis.