No: there is no legal requirement for a small business to use an accountant. Every filing HMRC or Companies House asks for can, in principle, be prepared and submitted by the business owner. The real question is whether doing it yourself is a good use of your time, and whether the risk of getting something wrong outweighs the fee. For some businesses the honest answer is that DIY works fine. For others, professional support pays for itself quickly.

This guide gives you a balanced way to decide, then points you to a detailed answer for your exact situation.

What the law asks of you, with or without an accountant

Start by separating three different things:

  • Legal obligations. Registering with HMRC, keeping adequate records, and filing returns on time are duties that sit with you, the business owner. Current GOV.UK guidance sets out what applies to your structure.
  • Professional recommendation. Nobody in authority requires you to appoint an accountant. Accountancy bodies and lenders may recommend it, but a recommendation is not a rule.
  • Practical benefit. An accountant can save time, reduce errors, claim reliefs you would miss, and give you someone to ask before decisions, not after.

Confusing these three leads people either to panic-hire or to assume DIY is reckless. Neither is true.

When professional help earns its keep

An accountant tends to add clear value when one or more of these applies:

  • You trade through a limited company, where accounts and Corporation Tax filings follow rules most owners have never worked with
  • You employ people, so payroll submissions and workplace pension duties recur every pay period
  • You are VAT registered, or close to the registration threshold described in current GOV.UK guidance
  • Your income comes from several sources: trading plus property, dividends or foreign income
  • You are making a decision with tax consequences: buying equipment, taking on a partner, changing structure
  • Deadlines already cause you stress, or you have missed one before

In these situations the question is less “can I do this myself?” and more “should I?”. The hours you spend learning compliance are hours not spent earning.

When doing it yourself is reasonable

DIY is a fair choice when your affairs are genuinely simple. A sole trader with one income stream, modest expenses, no employees and no VAT registration can often keep tidy records and complete a Self Assessment return without help. Cloud accounting software handles much of the arithmetic, and GOV.UK guidance is written for non-specialists.

The honest tests are these. Do you understand what you are claiming and why? Do you keep records as you go rather than reconstructing them later? Do you have the patience to read guidance carefully? If yes to all three, you may not need an accountant yet, though a one-off review of your first return is cheap reassurance.

How your structure changes the answer

Structure is the biggest single factor:

Weighing cost against value

Fees vary with the work involved, so compare like with like. Put a value on your own hourly time, estimate the hours bookkeeping and returns take you, and add something for the risk of errors and missed claims. Against that, weigh the quoted fee and what it includes. Many owners find the fee is smaller than the time cost alone; some find the reverse. Either answer is legitimate. The point is to decide with numbers rather than guilt or fear.

Every question in this series, answered

Each guide below takes one situation and answers it properly:

You may also find when should a small business hire an accountant? useful for timing.

Frequently asked questions

Is it illegal to run a small business without an accountant?

No. All filing obligations can legally be met by the business owner. What matters is that returns are accurate and on time. How you achieve that is up to you.

Will HMRC treat me differently if I have an accountant?

HMRC deals with your appointed agent for day-to-day matters, which many owners find less stressful. Responsibility for the accuracy of your returns stays with you either way.

Can I use an accountant for some things and not others?

Yes. Plenty of businesses keep their own books and hand over only the year-end work, or the reverse. A good firm will quote for exactly the pieces you want.

What if I start DIY and it stops working?

Nothing is lost. An accountant can take over at any point, and tidy records from your DIY period make the handover cheap and quick.

How do I know if my affairs count as “simple”?

One income source, no employees, no VAT registration and straightforward expenses is a reasonable working definition. Once any of those changes, revisit the question.

Talk it through with us

If you are still unsure which side of the line you sit on, a short conversation usually settles it. Read about our small business accountancy service, or request a quote and tell us what you are weighing up, and we will say honestly whether you need us yet.