CRA Submit Documents Online document upload

Official requirement

Add each required file. Conditional files are marked optional.

Requirement verified August 11, 2026 · Source: Canada Revenue Agency ↗

Documents this application needs

PDF/JPG · ≤500000 KB

Choose file or pagesSeveral pages are fine; we combine them into one PDF in order

Use the case or reference number CRA gave you, or select the correct topic and reason before attaching files.
Give every uploaded file a unique name.
Add a short description for each attached file.

Requirement verified August 11, 2026 · Source: Canada Revenue Agency ↗

Only if it applies to youPDF/JPG · ≤500000 KB

Choose file or pagesSeveral pages are fine; we combine them into one PDF in order

Requirement verified August 11, 2026 · Source: Canada Revenue Agency ↗

0/1 files ready

aggregate size by program
CRA allows 500 MB total for most programs and 1 GB total for Compliance and Audit programs.
How we handle it: This preset targets the stricter 500 MB total accepted by most programs. Compliance and Audit submissions may use the additional headroom directly in the CRA service.
supported format subset
CRA accepts additional Office, text, TIFF and XPS formats, plus more formats for Compliance requests. UploadPrep currently prepares PDF and JPEG.
How we handle it: Convert other accepted documents to PDF or JPEG before using UploadPrep, or upload them directly to CRA.