Japan e-Tax Supporting document upload
Official requirementAdd each required file. Conditional files are marked optional.
Requirement verified August 11, 2026 · Source: National Tax Agency ↗
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Documents this application needs
Tax-return supporting-document bundle
PDF · ≤14000 KB- e-Tax accepts supporting-document image data only in PDF format.
Requirement verified August 11, 2026 · Source: National Tax Agency ↗
0/1 files ready
Sources disagree on this
Repeatable PDF attachments
e-Tax permits up to 136 PDF files in one transmission with a combined 14 MB ceiling, while DocumentPreset cannot express a repeatable attachment slot.
How we handle it: This preset prepares one combined PDF bundle within the same 14 MB aggregate ceiling. Applicants who need separately classified files should upload them directly in e-Tax.
PDF page count
The National Tax Agency publishes file-count and aggregate-byte limits but no page-count limit.
How we handle it: UploadPrep uses a 100-page editor safety bound for the combined bundle.