Does 2025 TurboTax Online Support Uploading 1099B? Any Limit on PDF Size?

[starkyfubbs]

As of 2025, does TurboTax Online support uploading 1099-B (or equivalent pdf detailing trades)? See picture of instructions from a third-party site. If yes, is there a limit on pdf size?

Background: Been using desktop version of TurboTax Premier for years. I also do not rely on broker 1099B; instead I use a third party program to generate Form 8949, listing all sales. On desktop TurboTax Form 8949, I list single line sale summaries of long-term and short-term trades. Because the summaries have adjustments, the program then tells me to mail a paper copy of 1099B (in my case the third-party generated Form 8949) along with Form 8453. This is because TurboTax desktop does not support uploads.

I would like to avoid mailing 1500+ double-sided pages of Form 8949. Would the IRS get annoyed with receiving 1500+ sheets of paper year after year from one individual?

I have also been made aware per Form 8453, I could mail in “statement with the same information (as Form 8949)”. I could create a custom form listing more than 14 sales per single-sided page, and overall reduce number of mailed pages. But I prefer the upload pdf route if available.

[fanfare]

If any 8949 shows the mail-in option, during e-File TurboTax Online will ask for a PDF of your transaction details.

Last I heard, TurboTax download version did not. Maybe it's better this year.