How Much Does a Contractor Accountant Cost in the UK? A 2025–2026 Fee Breakdown from the Front Line

Let me be straight with you. I’ve been filing self-assessment returns and sorting out limited company accounts for UK contractors since before IR35 was even a whisper in the Budget. Over those twenty-odd years, one question has come up more times than I’ve had cups of tea with worried clients: “How much is this actually going to cost me?”

And the honest answer? It depends more than you might think. But unlike some advisers who dance around the figures, I’ll give you the real brackets, the hidden extras, and exactly what you’re getting for your money in the 2025/26 tax year.

The Real Price Ranges for Contractor Accountants Right Now

Before I dive into the nitty-gritty of what shapes these fees, here’s the plain English version of what you’ll typically pay across the UK.

Now, those numbers might look neat on a screen, but let me tell you about the three contractors who sat in my office last month. All doing similar IT work in Manchester. All paying wildly different fees. And all getting different value for money.

Why Your Neighbouring Contractor Might Pay Half What You Do

I had Darren on the phone last Tuesday. He’s a senior infrastructure engineer working through his limited company, mostly outside IR35. He was paying £195 a month to a nationwide “specialist contractor accountancy firm” and felt he was getting decent service. Then his mate James, doing almost identical work three miles away, mentioned he paid £115 a month to a small local firm in Altrincham.

Darren was furious. But here’s what James hadn’t mentioned – his £115 didn’t include his personal self-assessment return. That was another £250 annually. It also didn’t cover HMRC enquiry insurance, and when James needed a same-day calculation for a mortgage application, his accountant charged a £75 “rush fee.”

Darren’s £195 included everything. Unlimited questions. His wife’s self-assessment (she does part-time consulting). And when Darren switched contracts and needed his new IR35 status reviewing at 4pm on a Friday, his accountant turned it around by Monday morning at no extra cost.

The lesson? Never compare monthly fees in isolation. Compare the service wrapper around those fees.

What Contractors Actually Pay After Shopping Around

From processing hundreds of contractor engagements across my own practice and seeing the fee structures clients bring from other firms, here’s what the market genuinely looks like in 2025:

Entry-level digital-first firms (apps, portals, minimal human contact) – £75 to £100 monthly. These work brilliantly for contractors who are organised, rarely need advice, and just want compliance. But when something unusual happens – like a child benefit high income charge, or a capital allowance query on a laptop bought personally then used for the company – that’s often a £50 to £100 bolt-on conversation.

Mid-range specialist contractor accountants in the uk (the sweet spot for most) – £110 to £160 monthly. You’ll get a dedicated accountant (not just a call centre), full compliance suite including VAT and payroll, your personal tax return, and genuinely responsive service. Most contractors I advise end up happily in this bracket.

Premium full-service firms (£170 to £250+ monthly) – aimed at higher-earning contractors, often those with six-figure turnovers, multiple property income streams, or complex cross-border situations. You’re paying for strategic tax planning, not just form-filling.

What’s Actually Included? The Compliance Core

Here’s where I see contractors getting caught out. They assume “full contractor accounting” means the same thing everywhere. It doesn’t. So let me walk you through what a proper contractor accountant should handle as standard, based on HMRC’s current requirements.

Limited company incorporation and setup – A good accountant won’t charge separately for this if you’re signing up for ongoing monthly work. But some do. I’ve seen firms charge £150 to £300 for incorporation alone. Ask upfront.

Statutory annual accounts – This is your Companies House filing. Non-negotiable. Should be included.

Company Tax Return (CT600) – Also non-negotiable. HMRC expects this within 12 months of your year-end, but you’ll want it done much sooner to plan your dividend strategy.

Confirmation Statement – The annual £13 filing to Companies House. Some accountants include the fee in their monthly charge. Some don’t. Clarify this.

RTI payroll submissions – Even if you’re the only director and pay yourself a small salary (most contractor accountants recommend taking the secondary threshold of £12,570 for 2025/26 to protect your state pension and National Insurance record), you still need to report this to HMRC on or before every payday. That’s 12 monthly submissions plus a final P60 at year-end.

VAT returns – Quarterly, assuming you’re VAT registered, which you almost certainly should be once your turnover exceeds £90,000. But many contractors register voluntarily below that threshold. Your accountant should handle these returns as part of the monthly fee. Flat Rate Scheme calculations should also be included – though note that for limited cost businesses (most contractors), the Flat Rate percentage is now 16.5%, not the old 14.5% many older guides still mention.

Your personal Self Assessment tax return – This is the big one. Far too many “contractor packages” exclude this, then charge £250 to £400 extra come January. Read the small print. A genuine all-in contractor accountant includes your SA100 and all relevant supplementary pages (SA102 for employment, SA103 for self-employment if relevant, and importantly SA110 if you’re a company director).

The IR35 Factor That Changes Everything

I mentioned Darren and James earlier. The biggest single factor pushing fees up or down right now is how your accountant handles IR35 – specifically, whether they properly support you for both inside and outside determinations.

If you operate solely outside IR35, with all contracts clearly outside following a compliant status determination statement (SDS), your accounting is relatively straightforward. You’re running a conventional limited company.

But if you work inside IR35 – either via an umbrella or through your own limited company with deemed employment payments – the complexity multiplies. Your accountant needs to calculate the “deemed direct payment,” deduct PAYE and employee NICs, add employer NICs, and possibly handle the Apprenticeship Levy if your deemed payments push you over the £3 million threshold (rare for single contractors, but possible in large consultancies).

Accountants pricing for inside-IR35 contractors often charge £40 to £80 more monthly simply because the payroll calculations are more frequent and more error-prone. HMRC penalties for getting deemed payment calculations wrong are severe – up to 100% of the tax underpaid in some cases. That risk is reflected in the fee.

One-Off Costs That Surprise Most Contractors

After twenty years, I can predict exactly when a contractor will call me frustrated. It’s usually February, after they’ve signed up for a “budget” monthly package in September, and now they need something extra.

HMRC enquiries – If HMRC opens a compliance check into your return (not an investigation – there’s a difference, but that’s a separate article), your accountant’s standard monthly fee almost never covers the hours needed to respond. Expect £250 to £500 for a basic enquiry, or £150 to £250 per hour for anything substantial. Fee protection insurance – typically £75 to £150 annually – is worth its weight in gold.

CIS (Construction Industry Scheme) returns – If you’re a contractor in construction, even partially, monthly CIS returns to HMRC are often a £25 to £50 monthly add-on.

Year-end dividend planning – Some packages include a proactive year-end review. Many don’t. Without it, you might over-pay yourself in dividends and breach the higher rate threshold unnecessarily. A good accountant will flag this automatically. A basic compliance shop will just process what you tell them.

Handling P11D forms – If your company provides you with private medical insurance, a company car, or any other benefit-in-kind, you need form P11D filing by 6 July following the tax year. This is frequently excluded from standard packages, at an extra £100 to £200.

The Hidden Costs That Turn a £100 Monthly Fee Into £200

Let me tell you about Priya. She’s a management consultant based in Birmingham, operating through her limited company, consistently outside IR35. She found an online accountant advertising “complete contractor service” for £89 monthly. Sounded perfect.

Six months in, here’s what her actual costs looked like:

• Monthly fee: £89 plus VAT (£106.80)

• Company incorporation (not included): £175 one-off

• First year’s Confirmation Statement fee (not mentioned): £13 plus their admin fee of £30

• Expenses categorisation (only included basic bookkeeping, not proper expense coding): £45 monthly extra after she asked why her profit looked too high

• Telephone support (unlimited online messaging but phone calls billed at £1.50 per minute after first 10 minutes monthly): £67 in her second month when she had a urgent VAT question

• HMRC enquiry insurance (not offered in the base package, she had to source separately): £120 annually

By month four, her effective monthly cost had hit £187 before she even had her year-end accounts finalised. She moved to a mid-tier firm at £145 all-inclusive and saved money while getting better service.

What That £110 to £160 Actually Buys You (A Proper Spec)

When you’re comparing quotes, here’s the specification I recommend you demand for any monthly fee above £110:

Core compliance (mandatory)

• Preparation of statutory annual accounts (Companies House format)

• CT600 Company Tax Return with computations

• Confirmation Statement filing (including the £13 fee)

• Full RTI payroll for one director/employee, including FPS submissions each payday

• P60 at tax year end

• P45 when needed (often overlooked until someone leaves a contract)

• Full VAT service including quarterly returns, reconciliation, and payment reminders

• Your personal Self Assessment SA100 plus employment and dividend supplementary pages

• Dividend voucher preparation for each distribution

• Access to bookkeeping software (Xero, FreeAgent, or QuickBooks) with your licence fee included – FreeAgent in particular is common in contractor circles and worth about £25+ monthly on its own

Advisory (the value part)

• IR35 contract reviews within reason – typically three to five per year before extra charges apply

• Annual tax planning meeting or report, ideally before your year-end, covering salary versus dividend optimisation, pension contributions, and timing of large purchases

• Response to standard HMRC queries or requests for information without additional hourly billing

• Chaser service for late payments from clients (basic level)

What pushes you toward the higher end (£160–£250)

• More frequent advisory – eg, quarterly meetings rather than annual

• Handling multiple director/shareholder situations (husband-and-wife companies are common but genuinely more work)

• Property income within the same company (complicated from a tax perspective – often better to separate, but if combined, expect higher fees)

• Non-UK residency situations (even part-year)

• Complex expense profiling – large amounts of travel and subsistence, or overseas business trips requiring VAT reverse charge handling

The DIY Versus Accountant Cost Reality Check

Every so often, a contractor will tell me they’re considering doing their own accounts to save money. And look – for the first few months of a very simple, low-turnover company, that’s not insane. But let me run the real numbers based on HMRC’s penalty regime.

DIY approach costs (time and risk)

• Bookkeeping and VAT returns: 3-4 hours monthly at whatever your charge-out rate is. If you bill at £400 daily, that’s roughly £150 of your time monthly.

• Annual accounts and CT600: 10-15 hours annually, so another £600–900 of your time.

• Your personal self-assessment: 5-8 hours, £250–400 of time.

• Software costs: FreeAgent or similar, £25–35 monthly.

• Total annual time cost typically £2,500 to £4,000. Plus the stress. Plus the risk.

Penalty risk – Late filing of your Company Tax Return by one day: £100. Three months late: another £100. Six months late: HMRC estimates your tax liability and adds 10% of that estimate. Nine months: another 10%. I’ve seen contractors pick up £3,000 penalties because they missed a deadline while managing a busy contract.

Professional accountant cost – £1,500 to £2,500 annually all-in, plus perhaps £250 for fee protection. The time saving alone usually justifies the fee. The risk reduction absolutely does.

Umbrella Company “Accountancy” – What You’re Actually Paying For

This matters because roughly 40% of contractors I meet now work through umbrella companies, particularly since the 2021 IR35 reforms hit the private sector. Some umbrellas offer “accountancy support” as an add-on. Be very clear what this means.

Most umbrella accountancy services are not accountancy at all. They’re payroll processing with a tax code checking service. You won’t get:

• Tax planning advice (you can’t claim expenses beyond supervised mileage and limited subsistence anyway when working inside IR35 via an umbrella)

• Help with your full self-assessment return (though many umbrellas will provide a year-end summary)

• Advice on side businesses or rental income

• Support with HMRC investigations into your previous limited company years

If you’re permanently inside IR35 and have no other income streams, the umbrella’s basic service is fine. But if you have any complexity, you still need a real accountant. Budget separate fees.

Sector-Specific Fees You Should Know About

Not all contractors pay the same, even for the same accountant. Here’s the reality of how fees vary by sector in my experience:

IT and tech contractors – The largest group, so fees are most competitive. £100–150 monthly is standard for outside IR35. Accountants will often discount slightly because IT contractors tend to be organised and digitally literate, reducing hand-holding time.

Engineering and technical – Similar to IT but with more site-based expenses. Add £10–20 monthly for the extra expense categorisation work. CIS rules may apply for some engineering roles (site preparation, installation, commissioning) even if you don’t think of yourself as construction. This catches people out constantly.

Medical locums (doctors, nurses, allied health) – Slightly higher fees, typically £130–180 monthly. Why? Because your income often spans multiple NHS trusts, each with different payroll requirements, and you may have split years between on-payroll and off-payroll work. Also, many medical contractors have significant professional subscriptions and training costs that need careful handling.

Creative and media – Often unpredictable income (project-based, irregular months). Accountants charge a premium – often £150–200 – to handle the cashflow volatility and the complex royalty arrangements some creatives have.

How to Avoid Overpaying Without Getting Poor Service

After two decades, here’s my practical checklist for making sure you pay a fair price for the right service:

Ask for a full service matrix – Not just a price list. Get them to confirm in writing exactly what’s included, what’s extra, and the hourly rate for extra work. Any accountant who won’t provide this is hiding something.

Check if your licence fee is included – FreeAgent, Xero, QuickBooks. These cost £20–40 monthly if you buy directly. Accountants get them at wholesale rates but should pass that saving to you. If they’re charging you the software fee on top of your monthly fee, push back or walk away.

Confirm the self-assessment position – Is your personal return included? Both your first year and ongoing? If you’re a higher or additional rate taxpayer (additional rate kicks in above £125,140 for 2025/26), does that change anything? (It shouldn’t.)

Understand their IR35 stance – Do they proactively review contracts, or just wait for you to ask? The best firms monitor your working practices, not just your contract wording, because HMRC looks at reality, not paper.

Check professional body membership – Your accountant should be ACCA, ATT, CIMA, ICAEW, or AAT licensed. Not just “affiliated” – properly regulated. This gives you complaints routes and protection if things go wrong. Unregulated “tax advisers” charging £50 monthly are a false economy.

The Final Reality on Contractor Accountant Costs

Here’s what I tell every contractor who sits down in my office asking about fees: The cheapest accountant will cost you more in the long run through missed planning opportunities and uncovered risks. The most expensive is rarely worth it unless you have genuinely complex affairs. The sweet spot is a firm that understands your specific sector, includes everything you actually need, and charges a transparent monthly fee between £120 and £160 plus VAT.

Ask about what happens when things go wrong. Ask about response times. Ask to speak to a current client who has a similar profile to you. And never, ever choose an accountant based purely on the monthly fee quoted on a comparison website.

Because when HMRC opens an enquiry into your 2024/25 return – and one day, they might – you won’t care about saving £20 a month. You’ll care about whether your accountant answers the phone on a Friday afternoon and knows exactly which boxes to tick to put HMRC’s mind at rest. That’s what you’re really paying for.