Help Centre · Self Assessment (Beta) · 3 min read

Self Assessment across your clients and tax years

The firm-wide view of Self Assessment: the Individuals list's SA100 year, status and tax due columns, the dashboard card, and starting the next tax year with or without copying from the last.

Beta feature — Self Assessment tax returns are in beta and open to everyone — accountant firms and individuals filing their own return — for the 2025-26 tax year. If anything looks wrong, email support@taxoptimiser.co.uk and the team will help.

A firm with many Self Assessment clients needs to see the season at a glance, not one return at a time. The Individuals list and the firm dashboard both carry the Self Assessment position, and the return screen itself manages the tax years.

The Individuals list

Open Individuals and three columns show each client’s latest SA100 year, its status and the tax due from the last calculation. The status follows the year: Not started until something is keyed, In progress once the calculation has run, Waiting for HMRC while a submission is in flight, Rejected after an HMRC rejection, Filed once accepted — and Late is flagged on anything not filed once 31 January has passed. The year links straight to the return, the row’s menu has a Self Assessment entry, and the heading counts how many of the clients with a return are filed. Sort or search the status column to find who is still to do.

The firm's Individuals list with SA100 year, SA100 status and tax due columns, one client showing 2025-26, Filed and the amount due

The firm dashboard

The dashboard’s Self Assessment card shows the latest season: how many returns are filed, in progress and not started (or overdue after the deadline), the next deadlines with any rejected returns first, and a reminder of the 31 January date. Before any client has a Self Assessment year the card shows the set-up steps instead. Click through to the Individuals list from the card.

The Self Assessment card on the firm dashboard: tiles for filed, in progress and not started returns, and the next deadlines

Tax years on the return screen

The Tax Year selector on the return’s summary card switches between the client’s years, marking each as Accepted, Submitted or Rejected. When the next tax year opens for filing, a Start 2026-27 button appears underneath with two choices:

  • Start and copy — brings forward what stays the same from year to year: the pages in use, the employer, business, partnership and property details, the losses carried forward (into their brought-forward boxes), unused residential finance costs, the student loan plan, and the bank and adviser details. No other money figure is copied. A business that ceased, a partnership left or a property business that stopped is not carried; a directorship that ended rolls forward as a plain employment.
  • Start blank — a new year with only the personal details.

A year started by mistake can be removed with Remove this empty year, which appears only while the year has no figures on any page, no submissions, no attachments and no review requests, and only when the client has another year to fall back on.

Individuals filing their own return

An individual who signed up to Tax Optimiser themselves sees the same return screen from their own menu, with the same tax year controls. The firm-side list and dashboard are for accountant firms; client review is a firm feature too, so an individual declares and submits directly from the Submission section.

Back to the start: Self Assessment in Tax Optimiser (beta).

The short version

Self Assessment across your clients and tax years — in brief

The Individuals list shows each client's latest SA100 year, status (Not started, In progress, Waiting for HMRC, Rejected, Filed, Late) and tax due, with the year linking to the return.

The firm dashboard's Self Assessment card counts filed, in progress and not started or overdue returns for the season and lists the next deadlines, rejected first.

Start 2026-27 (when the year opens) offers Start and copy - pages, employer/business/partnership/property details, losses and unused finance costs, loan plan, bank and adviser details, no other figures - or Start blank.

Remove this empty year deletes a year started by mistake while it has no figures, submissions, attachments or review requests.