Use it only to answer an IRS notice or letter; don't send tax returns through it.
Have the access code or notice number, plus the SSN, ITIN or EIN shown on the notice.
Each PDF can have up to 120 pages.
How to do it with Requisito Listo
Open «IRS Documents Upload Tool».
Scan the pages with the camera or pick a PDF or photos you already have.
Put the pages in order.
The app builds the PDF under the size the portal asks for.
At the end you'll see a checklist: size, file weight, background and format. If something doesn't comply, it tells you what to fix before the portal rejects it.