An accountant prices a Self Assessment return by counting income sources, then weighing the state of your records. Each source (self-employment, property, dividends, capital disposals) adds sections to the return and checks behind them. That is the entire pricing logic, and once you see it, you can predict roughly where your own return sits on the scale before anyone quotes.
Self Assessment is often the entry point into a wider relationship, which is why we cover it inside the bigger small business accountancy cost picture too.
The baseline: a single-source return
The simplest paid-for return has one trade or one main income story, records in good order, and nothing unusual. The accountant prepares the figures, completes the Self Assessment return, calculates the liability and payments on account, and files it. This baseline exists at almost every firm; everything below adds to it.
What adds sections and fee to a return
- Self-employment. The trade’s accounts have to be prepared before the return can be, so record condition matters here more than anywhere. Sole traders should read our dedicated guide to sole trader accountancy costs.
- Rental property. Each property adds income and expense schedules; questions of allowable costs, joint ownership splits and finance cost treatment take genuine judgement. Multiple properties multiply the work.
- Capital disposals. Selling shares, a property or a business asset triggers gain calculations, base cost research and relief considerations, often the most technical part of an otherwise simple return.
- Dividends and investment income. Straightforward when documented, slow when the paperwork is scattered across platforms.
- Employment alongside other income. Usually light work, though multiple employments, benefits and share schemes add cross-checking.
- Foreign income. Overseas sources bring residence, remittance and double-taxation questions that sit well above baseline complexity.
Poor records are the hidden multiplier
Every one of the items above is priced assuming reasonable records. Arrive with gaps (missing statements, unlogged expenses, no purchase history for the shares you sold) and the accountant becomes an investigator on billable time. HMRC expects you to keep records supporting your return; meeting that expectation is also what keeps your fee at the quoted level. Some firms formalise this with a records surcharge; others quote after seeing the records. Either way, the shoebox premium is real.
Timing affects price and stress
Returns delivered to the accountant shortly before the filing deadline compete for the firm’s busiest weeks, and some firms price that pressure explicitly. Sending records early in the cycle gets more attention, more tax-planning conversation, and often a better fee. It also means you learn your liability months before it is due, which is useful for cash planning even though the payment date does not change.
Keeping the fee down without cutting corners
- Use digital record-keeping through the year rather than reconstructing in January
- Send everything in one complete batch. Drip-fed paperwork wastes billable touches
- Answer queries promptly while the accountant is inside your file
- Tell the firm about disposals and new income sources when they happen, not at year end
- Ask what their ideal records format is, and match it
Frequently asked questions
Is the fee per return or per person?
Per return, and each individual files their own. Couples with joint property need two returns, though firms usually price the second lightly since the underlying figures overlap.
Do directors always need Self Assessment?
Not automatically; it depends on whether there is untaxed income such as dividends. Many company packages include the director’s return. Check ours on the fees page, and see what else a company bundle covers in what an accountant costs a limited company.
What if I have missed previous years?
Late returns are a defined project: the firm establishes what is outstanding, reconstructs what records allow, and files in order. Pricing follows the number of years and the state of the evidence.
Can the accountant’s fee itself be claimed on my return?
For the self-employed, fees relating to the business accounts are generally allowable; fees for purely personal tax work follow different rules. The principles are in are accountancy fees tax deductible.
Will an accountant save me more than they charge?
No honest firm promises that. What they reliably provide is a correct return, claimed allowances you may have missed, deadline safety and time back. Where planning opportunities exist, a good accountant finds them, but the fee buys accuracy first.
Get your return priced on its real contents
Our Self Assessment service quotes from your actual income sources, not a one-size figure. Request a quote, list what your return needs to cover, and we will confirm the fee and what it includes before you commit.