What Online Contractor Accountants Charge

Why Cost Questions Come First

Most contractors who ask me about a contractor online tax accountant in the UK want one thing: a price they can trust. Fair enough. You're running a business where every pound of margin counts, and accountancy fees can look like a drain until you see what's being done for them.

The honest answer is that fees vary by structure, not by the quality of the service. A sole trader filing a Self Assessment return needs far less than a limited company director paying themselves through salary and dividends. Below, I've set out typical 2026/27 market pricing as I see it in practice. Quotes will differ by provider.

Typical Monthly Fees by Structure

Online firms usually sell fixed monthly packages, which suits contractors who dislike surprise invoices.

• Sole trader: roughly £25 to £60 a month, covering the Self Assessment return and basic bookkeeping.

• Limited company: roughly £70 to £150 a month, including year-end accounts, corporation tax, payroll and director's returns.

• Umbrella company worker: often a one-off £100 to £250 for a tax return, because the umbrella handles PAYE.

• Partnerships: typically £60 to £130 a month, depending on the number of partners.

Prices at the very bottom of these ranges often exclude extras, so read the small print.

What a Standard Package Includes

A decent limited company package should cover the following:

• Annual statutory accounts filed with Companies House

• Company Tax Return (CT600) submitted to HMRC

• Director's Self Assessment return

• Payroll for one director, including RTI submissions

• VAT returns if you're registered

• Year-end dividend paperwork and a P60

If a package leaves out the director's personal return, that's a red flag. It's the part most contractors need help with.

Pricing Snapshot Table

What Pushes the Price Up

Complexity is the main driver. In my experience, the following tend to raise a quote:

• Messy or backdated bookkeeping

• Multiple income streams, such as property or overseas work

• A pending IR35 status dispute or off-payroll working review

• Employing staff, which means auto-enrolment and P11D questions

• Late filing history

If you arrive with records in order, you'll nearly always pay less.

A Worked Example

Take a contractor outside IR35 invoicing £6,000 a month, so £72,000 a year. Their accountant charges £120 a month, which is £1,440 a year. That fee is an allowable business expense, so it reduces taxable profit. At the 25% main corporation tax rate, the real after-tax cost is roughly £1,080. If the accountant also catches a missed expense claim or a better salary and dividend split, the net cost can be close to zero.

Getting Value, Not Just a Low Price

How the Tax Rules Shape Your Fees

Your accountant's workload comes straight from the tax rules. For 2026/27, the Personal Allowance is £12,570, and the corporation tax main rate is 25%, with a 19% small profits rate up to £50,000 and marginal relief between £50,000 and £250,000. Directors commonly take a modest salary and extract the rest as dividends.

Dividend tax rates have increased for 2026/27, so it's worth confirming the current bands with your accountant or on GOV.UK. Planning your extraction strategy each year is part of a good service.

Making Tax Digital Is Changing the Brief

From 6 April 2026, Making Tax Digital for Income Tax applies to self-employed people and landlords with qualifying income above £50,000. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028. If you're a sole trader contractor, you'll need compatible software and quarterly updates.

Limited company directors aren't directly in scope for their company income, but they may be if they have significant self-employment or rental income outside the company. Check this with your accountant early, because it affects the software and support you need.

Key Deadlines Your Accountant Should Track

Missing the 31 January deadline brings an automatic £100 penalty, with more building up the longer the delay.

Questions That Reveal a Good Accountant

Before you sign, ask these:

• Are they regulated by a professional body such as ICAEW, ACCA or AAT, and do they hold professional indemnity insurance?

• Is the fee genuinely fixed, or do they charge extra for contacting HMRC?

• Do they understand IR35 and off-payroll working under Chapter 10 ITEPA 2003?

• Can you speak to a named person, not just a chatbot?

Spotting Hidden Costs

Cheap headline fees can hide charges for things like:

• Registering for VAT

• Responding to HMRC enquiries

• Advice on contract reviews

• Changing your dividend plan mid-year

• Cancelling the service

Ask for a written scope of work. Reputable firms provide an engagement letter without fuss.

Common Contractor Scenarios I See

A contractor moves from an umbrella to their own company after the client confirms they're outside IR35. They usually spend the first year learning to separate personal and business money. Another contractor assumes they're outside IR35 because their contract says so, only for HMRC to look at how the work is actually done. Both cases show why advice, not just filing, is what you're paying for.

Choosing and Switching Sensibly

Is Online Really Cheaper?

Generally, yes. Online firms run lean, use cloud platforms like Xero, FreeAgent or QuickBooks, and automate routine work. A traditional high street practice might charge £150 to £300 a month for a similar limited company service, though you may get more face to face time.

When Paying More Makes Sense

If you have rental properties, overseas income, share options or you're nearing the £100,000 income level where the Personal Allowance starts to taper, a specialist is worth the extra. The 60% effective rate between £100,000 and £125,140 is a trap where good planning pays for itself.

Contractor Specific Expertise Matters

A generalist can file your accounts but may miss contractor specific points. These include the cost of travel and subsistence under the temporary workplace rules, the Flat Rate VAT Scheme (where the 16.5% limited cost trader rate often applies to contractors with low spend on goods), and pension contributions made by the company.

How to Switch Accountants Smoothly

Switching is simpler than most people expect. Here's the usual sequence:

1. Give notice under your existing engagement terms.

2. Ask for professional clearance and your records.

3. Authorise the new firm through HMRC's agent services.

4. Share your Companies House authentication code.

Most online firms handle the migration for you, often within a couple of weeks.

Keeping Your Own Records Tidy

Even with a good accountant, your habits drive the bill. Keep receipts, separate business banking, and a clear record of mileage and home working costs. HMRC expects records for at least five years after the 31 January submission deadline, so don't bin anything early.

Final Thoughts

A realistic budget for a contractor online tax accountant in the UK is £70 to £150 a month for a limited company, or £25 to £60 for a sole trader. Focus on scope, contractor specific knowledge and regulation rather than the lowest price. A good accountant should save you more than they cost, through correct expense claims, sensible director remuneration and no late filing penalties. Rates and thresholds can change each tax year, so always confirm current figures on GOV.UK or with a qualified adviser before making decisions.