SA100
Main Tax Return
The core Self Assessment form. Every other supplementary page (like SA103) attaches to this one — it's what actually gets submitted to HMRC as the overall return.
What it's for
Captures your personal details, declares which supplementary schedules are included (e.g. self-employment), records State Pension and other taxable state benefits, and carries the final declaration you're signing off on.
Who uses it
Everyone filing a Self Assessment return, regardless of income type.
What we ask you for
- Name, UTR, and NINO
- Which schedules apply (we set this automatically based on your answers)
- State Pension and other taxable state benefits, if any
- Your final declaration before submission
Limits & things to know
ClearYear currently supports the self-employment schedule only — property income, capital gains, and employment (PAYE) income sections of the SA100 are not collected or submitted through this service.