Self assessment tax return service
Prepare and file Self Assessment returns for sole traders, landlords and freelancers from your home office.
- £500-2.5k
- Side hustle
- From home
Estimates for a small start in the UK, not guarantees.
Official data
12,759 UK companies in this field, 18% registered in the last 2 years
SIC 69203 “Tax consultancy”. Source: Companies House, November 2026.
What it is
A part-time or full-time service preparing Self Assessment tax returns for individuals, working from home using tax software and online document sharing.
Your first three steps
- Check your tax knowledge and consider a recognised course such as AAT or a tax technician qualification
- Choose tax software that files with HMRC and price a few standard return types after checking local rivals
- Tell people you know who are self-employed or let property, and ask for your first few clients
Who pays
Sole traders, landlords, freelancers, people with side incomes and anyone who finds the HMRC process confusing.
How it makes money
A fixed fee per return, with extra charges for more complex returns (for example rental income or capital gains) and optional yearly bookkeeping help.
Skills that help
- Good with numbers and detail
- Knowledge of UK personal tax
- Clear, patient communication
- Organised, especially around deadlines
Watch out for
- Professional indemnity insurance, and check whether you need other cover
- Anti-money laundering supervision: check whether you must register with HMRC or a professional body
- Data protection: check whether you need to register with the ICO, and keep client data secure
- Check HMRC rules on acting as an agent for clients, including authorisation
- Work is heavily concentrated before the 31 January deadline, so plan your workload and cash flow
Deep research report · UK
Everything you need to start: self Assessment tax return service
Researched with live web search for United Kingdom: real startup prices, the licences and rules, what others charge, a break-even example, how to find your first customers and a 30-day launch plan. With sources.
- Startup costs with real prices
- Licences, registration and rules
- Pricing: what others charge
- Break-even example
- Finding your first customers
- 30-day launch plan
- Risks and how to reduce them
Questions people ask
How much does it cost to start a Self Assessment tax return service?
Startup costs are typically around £500 to £2,500, depending on the software, insurance and set-up you choose. These are estimates, so check what you need before committing.
How much can I earn preparing Self Assessment returns?
Monthly revenue is typically around £300 to £3,000, depending on how many clients you take on. This is an estimate, and the idea assumes at least about 6 hours a week. Work is heavily concentrated before the 31 January deadline.
What rules should I check before preparing tax returns for clients?
Check professional indemnity insurance and anti-money laundering supervision, including whether you must register with HMRC or a professional body. Also check data protection and ICO registration, and HMRC rules on acting as an agent, including authorisation.
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