Do You Need an Accountant in the UK? What Small Business Owners Should Know

One of the first questions new business owners ask, usually around October when the Self Assessment deadline starts looming, is whether they actually need an accountant. The honest answer is: it depends. But the way it depends is worth understanding properly, because the decision affects your time, your tax bill, and how much of your profit you actually keep. This guide covers what accountants do for small businesses, when hiring one makes financial sense, when you can manage without one, and what everything costs in 2025.

The short answer

There is no legal requirement to use an accountant as a sole trader or small business owner in the UK. You can prepare and file your own Self Assessment tax return, manage your own bookkeeping, and handle your own VAT returns if you're registered. But legally allowed to do it yourself and wise to do it yourself are two different things. The question isn't whether you're permitted to go it alone; it's whether doing so costs you more in missed savings, avoidable penalties, and wasted time than you'd pay an accountant.

What does an accountant actually do for a small business?

Most people think accountants just file their tax returns once a year. That's one thing they do. Here's a more complete picture:

Compliance work — the things that have to get done regardless:

• Preparing and filing your Self Assessment tax return (sole traders)
• Preparing year-end accounts and Corporation Tax return (limited companies)
• Filing accounts with Companies House (limited companies)
• VAT return preparation and submission
• Payroll and PAYE administration if you have employees

Tax efficiency — where a good accountant earns their fee:

• Making sure you're claiming all allowable expenses: Including less obvious ones like home office use, equipment depreciation, and professional subscriptions
• Advising on the most tax-efficient way to pay yourself (particularly relevant for limited company directors)
• Helping you decide when or whether to register for VAT, and which VAT scheme suits your business
• Planning for tax bills so you're never caught off guard
• Advising on the right business structure when it might make sense to move from sole trader to limited company

Advisory and protection:

• Communicating with HMRC on your behalf if something goes wrong
• Representing you in an HMRC enquiry or investigation
• Advising on cash flow, business planning, and growth decisions

The further down that list you go, the more it depends on the quality of the individual accountant. The compliance work is consistent. The advisory value varies significantly.

When you probably don't need an accountant

If all of the following apply to you, managing without an accountant is entirely reasonable, at least for now:

• You're a sole trader with straightforward finances: One main income source, relatively simple expenses
• Your annual turnover is comfortably under the VAT threshold (£90,000)
• You have no employees
• You're comfortable using accounting software to track income and expenses
• You're reasonably organised with your records throughout the year

In this situation, good accounting software handles most of the heavy lifting. Your income and expenses are tracked in real time, your Self Assessment figures are mostly ready to pull together, and filing online through HMRC's system is genuinely manageable with a bit of preparation.

The key is being honest about your confidence level with the numbers and your willingness to stay on top of HMRC deadlines. If both of those are solid, going it alone at the early stages is a legitimate choice.

When you probably do need an accountant

Certain situations make professional support genuinely worth the cost:

You're approaching or exceeding the VAT threshold. VAT registration, VAT scheme selection, and regular VAT return submissions add a layer of complexity that catches many small business owners out. An accountant pays for themselves quickly here.

You're setting up or already operating as a limited company. The compliance requirements for a limited company. Corporation Tax returns, annual accounts for Companies House, confirmation statements, and director Self Assessments are significantly more involved than sole trader requirements. Most limited company directors use an accountant, and for good reason.

You have employees. PAYE, National Insurance, pension auto-enrolment, and payroll submissions to HMRC are a compliance minefield, and the penalties for getting it wrong are meaningful. Unless you're using payroll software you're very comfortable with, professional support is usually worth it.

Your finances are complicated. Multiple income streams, rental properties, investments, overseas income, capital gains, the more moving parts your financial picture has, the more scope there is for mistakes and the more an accountant can save you.

You're being investigated by HMRC. This is not a situation to navigate alone. Get professional help immediately.

You simply don't have the time. Time is money. If managing your own accounts means spending 10 hours a year on something that stresses you out and keeps you from client work, paying an accountant to take it off your plate can be the right call even if your finances are simple.

How much does an accountant cost in the UK?

Accountant fees vary considerably depending on your business type, complexity, and what's included. Here are realistic current figures for 2025:

Sole traders:

Limited companies:

A few things worth knowing about these numbers:

The state of your records significantly affects the price. Organised, up-to-date bookkeeping means less work for your accountant, which means lower fees. Messy records mean your accountant spends time untangling your finances before they can do anything else, and that time costs money.

Online accountants are generally cheaper than traditional high-street firms and are just as good for most small businesses. Most now work entirely remotely and are fully Making Tax Digital compliant. Accountant fees are an allowable business expense, so you can deduct them from your taxable profit, effectively reducing the real cost by your marginal tax rate.

The alternative: accounting software

For many small businesses, particularly sole traders and freelancers, accounting software hits the right balance between capability and cost. Modern tools handle invoicing, expense tracking, bank reconciliation, VAT calculations, and Self Assessment preparation in one place, at a fraction of the cost of a full accountant.

The most widely used options in the UK for small businesses are:

FreeAgent — popular with freelancers and sole traders. Includes Self Assessment filing, expense tracking, invoicing, and Making Tax Digital support. Often included free with certain business bank accounts (NatWest, Royal Bank of Scotland). Around £19 per month if paying directly.

QuickBooks —A strong all-rounder for growing small businesses. Good reporting, payroll add-on available, widely supported by UK accountants. Plans from around £14 per month.

Xero — particularly popular with limited companies and businesses with employees. Clean interface, strong bank feed integration, and excellent accountant compatibility. Plans from around £16 per month.

Sage Accounting — established name, good for businesses that want UK-based support. Plans from around £15 per month.

Worth noting: most of these tools are designed to work alongside an accountant, not replace one entirely. Even if you manage your day-to-day bookkeeping yourself, many small business owners use an accountant for year-end accounts and tax returns only — a hybrid approach that keeps costs down while ensuring the important filings are done right.

The hybrid approach: Often the best of both worlds

The most practical setup for many small businesses, particularly sole traders in the early stages, looks like this:

1. Use accounting software to track income and expenses throughout the year, invoices raised, expenses categorised, and bank feeds connected
2. Manage day-to-day bookkeeping yourself — it takes less time than most people expect when the software is set up properly
3. Bring in an accountant once a year for your tax return and year-end accounts. They review your figures, check you've claimed everything you're entitled to, and file on your behalf

This approach typically costs £150 to £400 per year for the accountant's involvement, plus your software subscription, and gives you the peace of mind that your tax affairs are being handled properly without paying for a full monthly service.

As your business grows, more turnover, more complexity, employees, VAT registration, you can scale up the level of professional support accordingly.

Questions to ask before hiring an accountant

If you decide to bring in an accountant, these questions help you choose the right one:

• Are you qualified with a recognised UK body (ICAEW, ACCA, CIMA, AAT)?
• Do you specialise in small businesses and sole traders?
• What's included in your fee, and what's extra?
• Are you Making Tax Digital ready?
• What software do you use, and is it compatible with what I'm using?
• Will I have a dedicated point of contact?
• Can you provide a client reference in a similar situation to mine?

A good accountant should be able to tell you, within the first conversation, roughly what their services will cost and what it covers. If the answer is vague, keep looking.

The bottom line

You don't legally need an accountant in the UK as a sole trader or small business owner. But that doesn't mean going without one is always the right call.

If your finances are simple and you're organised, good accounting software handles most of what you need at a fraction of the cost. If your business is growing, you have employees, you're VAT-registered, or you're operating as a limited company, professional accounting support pays for itself, usually many times over.

The worst outcome is neither option: managing your finances yourself without proper software or records, missing expenses you're entitled to claim, and arriving at January with a tax bill you weren't prepared for.

Whatever you decide, keeping clean records throughout the year is the foundation on which everything else is built.

Useful tools and resources

• HMRC Self Assessment checker — gov.uk/check-if-you-need-tax-return
• Find a qualified accountant — icaew.com/find-a-chartered-accountant
• FreeAgent — freeagent.com
• QuickBooks UK — quickbooks.intuit.com/uk
• Xero UK — xero.com/uk
• Built For Small Business — free invoicing, expenses and client management for UK small businesses builtforsmallbusiness.com

This article is for general information purposes only and does not constitute tax, legal, or financial advice. We recommend speaking with a qualified accountant or adviser about your specific circumstances.

Last updated: April 2026