What is self-assessment outsourcing, and what does it cost?
Self-assessment outsourcing means another team prepares the personal and partnership tax returns and hands them back for your review. EarthOne prepares SA100 returns for individuals and SA800 returns for partnerships, with supporting computations, for UK accounting firms. Returns are delivered for partner review and submission, or filed on your instruction. Per-return pricing is available on request, hourly work is £16.50 an hour, and returns are also covered within a dedicated accountant from £850 a month.
What is included
- SA100 returns for individuals and SA800 returns for partnerships
- Supporting tax computations
- Property income, dividend income, capital gains and foreign income
- HMRC submission on your instruction, or partner-review-only delivery
What it costs
| Model | Rate | Best for |
|---|---|---|
| Per return | On request | A known number of returns before 31 January |
| Ad hoc | £16.50 an hour | Variable volume, overflow, or trying the work before committing |
| Dedicated senior accountant, part-time (80 hours a month) | £850 a month | Steady monthly volume, same person every week |
| Dedicated senior accountant, full-time (160 hours a month) | £1,450 a month | A full seat working on your firm or business only |
Tell us the number and type of returns and we will quote a per-return price. No onboarding fee, management fee or software charge. Ad hoc work is invoiced monthly for the hours used. There is no 12-month contract. Full detail is on the pricing page.
How it works
You send us the scope.
Tell us the volume, the software and what you need back. We tell you which pricing model fits and what it would cost.
We sign the Data Processing Agreement.
A GDPR-aligned DPA is signed before any file moves.
A named CA starts inside your software.
They work on your files, to your chart of accounts and your templates. On the dedicated model it is the same person every week.
A second qualified CA reviews the work.
Every file is reviewed internally before it leaves us. Weekly timesheets show what was done, the time spent and who did it.
You review and sign off.
Nothing goes to HMRC or Companies House without your instruction.
Who does the work
Every file is prepared by a qualified Indian Chartered Accountant, a member of the Institute of Chartered Accountants of India (ICAI), and reviewed by a second qualified CA before it leaves us. It is an Indian qualification, separate from the UK ACA and ACCA, and we don't present it as one. Our team works in UK GAAP, MTD and HMRC processes every day.
We work inside your existing tax software, including TaxCalc and IRIS.
You keep the sign-off and the client
We prepare the return and the computations. A second qualified CA reviews the file before it leaves us. Your partner reviews and approves it. Nothing goes to HMRC without your instruction, and we do not contact your clients.
More on how the arrangement works for practices is on the For Accounting Firms page.
Talk to a qualified CA, not a sales team.
Tell us how many returns you need prepared before 31 January and what income types they cover. We will quote a per-return price.
Book a free 30-minute consultation