When Do I Need an Accountant? (UK Small Business Guide 2026)

If you’re asking when do I need an accountant?, here’s the honest short answer: in the UK you’re almost never legally required to have one. You can file your own Self Assessment, your own company accounts and your own VAT returns. The only real legal exception is larger limited companies that cross the audit thresholds and must have a statutory audit — which very few small businesses ever reach.

So this isn’t really a question of law. It’s a question of trigger points — the moments where doing it yourself starts costing you more in tax, time and risk than an accountant would charge. Below are the clear signs it’s time, the situations where you can probably still manage alone, and what an accountant actually does at each stage.

Do you legally need an accountant?

No — with one nuance. There is no law that says a sole trader, landlord or limited company must appoint an accountant. HMRC and Companies House are perfectly happy for you to file everything yourself.

The one exception worth knowing: a limited company must arrange an independent statutory audit once it exceeds two of three size thresholds (broadly turnover above £10.2m, balance sheet above £5.1m, or more than 50 employees). That’s a world away from a typical small business, so for almost everyone reading this, using an accountant is a choice, not an obligation.

The useful question, then, isn’t “do I have to?” — it’s “at what point does it clearly pay to?”

The signs you need an accountant now

These are the trigger points where most people stop managing alone. If one or more of these is true for you, it’s usually time to get help.

• You’re going limited (or thinking about it). A limited company brings statutory accounts, a Corporation Tax return, Companies House confirmation statements and director responsibilities. The admin jumps sharply, and so does the opportunity to be tax-efficient through the right salary/dividend split. This is the single most common moment people bring in an accountant. (If you’re still at the planning stage, see our guide on how to set up a limited company.)
• You’re approaching the £90,000 VAT threshold. Once your taxable turnover passes £90,000 in any rolling 12-month period, you must register for VAT — and VAT brings quarterly returns, scheme choices and Making Tax Digital filing. Getting the timing and scheme right (and not registering a moment too late) is exactly where an accountant earns their keep. Our VAT threshold explained guide covers the detail.
• You’re hiring staff or running payroll. The moment you employ someone — including paying yourself a salary through your own company — you’re into PAYE, National Insurance, pension auto-enrolment and Real Time Information filings. Payroll mistakes are easy to make and awkward to unwind.
• You have income from several sources. Self-employment plus a salary, plus rental income, plus dividends or a side business — the more streams you have, the harder Self Assessment gets, and the more reliefs and allowances there are to miss.
• Making Tax Digital is coming for you. From April 2026, Making Tax Digital for Income Tax applies to self-employed people and landlords with gross income over £50,000, who’ll need to keep digital records and send quarterly updates to HMRC instead of one annual return. (The threshold drops to £30,000 from April 2027, and £20,000 from April 2028.) If that’s you, getting compliant software and a process in place is worth doing properly.
• You’re spending your evenings on the books. This one isn’t on any HMRC form, but it’s just as valid. If bookkeeping, receipts and deadlines are eating the time you should be spending running — or enjoying — your business, an accountant buys that time back.
• You’re growing, raising finance or want to plan ahead. Applying for a loan or investment, taking on bigger contracts, or simply wanting to understand your numbers and plan for tax — these are all points where professional advice changes the outcome, not just the paperwork.

If you recognise yourself in two or more of these, you’re past the DIY stage. It’s worth weighing up properly — our piece on is it worth getting an accountant walks through the cost-versus-benefit honestly.

When you can probably manage yourself

It’s only fair to say it plainly: not everyone needs an accountant. You can likely file your own return, at least for now, if all of these are true:

• You’re a sole trader or landlord with relatively low income and a small number of transactions.
• You’re well under the £90,000 VAT threshold and not registered for VAT.
• You don’t employ anyone and don’t run payroll.
• You have income from one or two simple sources, not a tangle of them.
• Your records are tidy and you’re comfortable using HMRC’s online services.

If that’s you, a good bookkeeping app and an organised hour each month may be all you need. The thing to watch is the drift: businesses grow, turnover creeps toward thresholds, and a simple picture quietly becomes a complicated one. The trigger points above are your cue to revisit the decision.

What an accountant actually does at each stage

It helps to see what you’re getting at different points, because the value changes as your business does:

• Just starting / very simple — light-touch help: choosing sole trader vs limited, setting up bookkeeping software, and making sure your first Self Assessment is right.
• Established sole trader — annual accounts and Self Assessment, expense and allowance checks, and a heads-up before you hit the VAT threshold.
• VAT registered — quarterly VAT returns, the right VAT scheme for your business, and Making Tax Digital filing.
• Limited company — statutory accounts, the Corporation Tax return, Companies House filings, and the tax-efficient salary/dividend planning that’s hard to get right alone.
• Employing staff — payroll, PAYE, pension auto-enrolment and the ongoing RTI submissions.
• Growing or raising finance — management figures, forecasts, and advice you can take to a lender or investor.

A good accountant should save or protect more than they cost at every one of these stages — through claimed reliefs, avoided penalties and time returned to you.

How to get started

If you’ve decided it’s time, the process is simpler than people expect:

1. Work out what you actually need — accounts only, or VAT and payroll too? The trigger points above tell you most of it.
2. Get a clear, fixed-price quote so you know exactly what’s included and there are no surprise bills.
3. Choose someone you can actually reach — a named accountant who answers calls and emails, not a call centre. Our guide on how to choose an accountant covers the questions to ask, and how much an accountant costs sets your expectations on price.
4. Switch when you’re ready — moving accountant (or appointing your first) is straightforward, and a good one handles the handover for you.

This is general guidance rather than advice for your specific situation — but for most people, the signs above make the decision fairly obvious once you see them written down.

The bottom line

You’re rarely required to have an accountant — but there are clear moments where it plainly pays to get one: going limited, nearing the £90,000 VAT threshold, taking on staff, juggling several income streams, facing Making Tax Digital from April 2026, or simply losing your evenings to the books. If any of those describe you, you’ve likely reached the point where an accountant saves more than they cost.

If you’d like to know exactly what that would look like for your business, request a fixed-price quote and I’ll come back to you within 24 hours — or take a look at our simple monthly pricing first.