Do I need an accountant for Self Assessment?
You do not legally need an accountant for Self Assessment, but one can be useful if you have self-employment, rental income, capital gains, foreign income, dividends, high income, or incomplete records.
Last reviewed: 3 September 2026 · Editorial policy
When DIY may be enough
A simple return with one income source and clear records may be manageable yourself, especially if you understand what HMRC is asking for and have time to check the figures.
When advice is worth comparing
Accountant support is more valuable when the return includes property, sole trader profits, capital gains, foreign income, crypto, dividends, high income child benefit charge, student loans, or payments on account.
Use a complexity and consequence test
Ask two questions: how difficult is the return, and what happens if it is wrong? A return with one small sole trade and clean records may be straightforward. A return involving residency, foreign income, a property sale, business losses, share schemes or large pension contributions can have consequences beyond entering numbers in boxes.
Time pressure matters too. If records are incomplete or a deadline is close, professional help may reduce risk, but an accountant still needs enough evidence and time to work. Hiring someone in late January does not transfer the deadline or guarantee they can accept the job.
What an accountant can actually do
The useful work may include identifying the correct return pages, checking allowable expenses and reliefs, reconciling tax already deducted, calculating payments on account, preparing supporting computations and submitting as an authorised agent. Advice should also explain the result and next deadlines.
You remain responsible for providing complete facts and reviewing the return. HMRC’s guidance warns taxpayers not to sign blank returns or share their personal sign-in credentials with an agent.
A middle option: review rather than full preparation
If most of the return is simple, you could prepare records and calculations yourself, then pay for a review of one complex issue or the completed return. Confirm exactly what the reviewer will check and whether they will submit it or only provide comments.
Information to send for a useful quote
State the tax year, deadline, income sources, estimated transaction count, whether bookkeeping is complete, previous-return status and any HMRC correspondence. Mention foreign items, gains, crypto, property, pensions and student loans upfront. A clear brief produces a more reliable price and avoids discovering excluded work after appointment.