Form 8453 is asking that I send in Form 8949. Don't have form 8949. Ihave forms 1099DIV, 1099B

[DDollar · Accepted solution]

It sounds like you entered category totals for investment sales rather than enter individual transactions.  When you complete Form 8949 in such a manner, it generates Form 8453 and what the IRS really wants is for you to mail them a copy of your 1099-B.  Form 8453 is used to identify your 1099-B with your tax return.

[migreenleaf]

I had the same problem. I finally found that TurboTax had prepared Form 8949, and it was buried in the tax return (page 8 for me) and labeled with tiny font on top and bottom of page.