Should I check the box 'The cost basis is incorrect or missing on my 1099-B', after I fill the real cost in Box 1e, which was empty in the original form?

[HelenC12]

Yes, check the box to indicate that form 1099-B, Box 1e was incorrect or blank.

• When you sell, you’ll need your cost basis to subtract from the money you made from the sale. This way, instead of paying tax on the full sale amount (proceeds), you only get taxed on the profit.

[mmike0]

Thanks.