If you are a contractor operating through your own limited company — or thinking about setting one up — choosing the right accountant is one of the most important decisions you will make. A good contractor accountant does far more than file your year-end accounts. They help you structure your income tax-efficiently, keep you compliant with IR35, manage your VAT returns, file your quarterly payroll, and ensure your self-assessment is accurate and on time.
The wrong accountant, by contrast, can cost you thousands in missed tax-planning opportunities, late-filing penalties, or — worst of all — an unexpected HMRC investigation that could have been avoided with proper IR35 advice.
This guide compares the UK's leading specialist contractor accountants side by side, covering monthly fees, included software, IR35 support, insurance, and first-year discounts. We also explain what a contractor accountant actually does, how to choose between firms, and which questions to ask before signing up.
What Does a Contractor Accountant Do?
A specialist contractor accountant handles the full range of financial and compliance tasks that come with running a personal service company (PSC). Unlike a general high-street accountant, they understand the specific needs of limited company contractors — from IR35 compliance to dividend and salary optimisation to the VAT flat rate scheme.
Bookkeeping & Accounting Software
Most contractor accountants provide access to FreeAgent or Xero at no extra cost. These platforms connect to your business bank account, automatically categorise transactions, and generate real-time profit and loss reports. Your accountant reviews the data and uses it to prepare VAT returns, payroll submissions, and year-end accounts. The software also handles Making Tax Digital (MTD) submissions directly to HMRC.
VAT Returns
Most limited company contractors are VAT-registered and submit quarterly returns. Your accountant prepares and files these on your behalf, taking advantage of the Flat Rate Scheme if eligible (currently 16.5% for limited cost traders and lower rates for specific industries). They also advise on whether the Flat Rate Scheme or standard VAT accounting is more beneficial at your turnover level.
Payroll & RTI
Even if you pay yourself a small salary each month, your limited company must run payroll and submit Real-Time Information (RTI) reports to HMRC on or before each payment date. Your accountant handles this — typically as part of the monthly fee — ensuring your salary stays at the optimal level for National Insurance efficiency (usually around the NI primary threshold).
IR35 Support & Contract Reviews
This is where specialist contractor accountants add the most value. They can review your contracts to assess IR35 risk, advise on whether your working practices support an outside-IR35 determination, and recommend changes to strengthen your position. Many firms also provide IR35 insurance as part of their package or as an add-on, covering up to £100,000 of HMRC enquiry costs.
Year-End Accounts & Corporation Tax
Every limited company must file annual accounts with Companies House and a corporation tax return with HMRC (due 12 months after the end of your accounting period). Your accountant prepares both, calculates your corporation tax liability (currently 19% or 25% depending on profit level), and advises on dividend timings to minimise the total tax bill.
Personal Self-Assessment
As a company director, you need to file a personal tax return each year covering your salary, dividends, and any other income. Most contractor accountants include this in their standard package or offer it as an add-on. Getting this right is critical — especially with the dividend allowance now at just £500.
How We Compare Contractor Accountants
We evaluated each firm across six criteria that matter most to limited company contractors:
- Monthly fee: The price range for standard contractor packages, including VAT where stated. Most firms charge £100–£200/month.
- FreeAgent or Xero: Whether the accountancy software is included at no extra cost, and which platform is used.
- IR35 support: Whether the firm offers contract reviews, IR35 status assessments, and insurance as part of the package.
- Insurance: Professional indemnity, fee protection, and IR35 enquiry cover included or available as add-ons.
- First-year discount: Introductory offers for new contractor clients — typically 25–50% off the first year's fees.
- Customer reviews: Trustpilot and independent review scores reflecting real contractor experiences.
Comparison Table: Best Contractor Accountants (2026/27)
| Accountant | Monthly Fee (ex. VAT) | FreeAgent / Xero | IR35 Support | Insurance | 1st Year Discount |
|---|---|---|---|---|---|
| Nixon Williams | £120 – £150 | FreeAgent included | Contract reviews, IR35 insurance | £100k IR35 cover incl. | 50% off first 6 months |
| InTouch | £110 – £145 | FreeAgent included | Full IR35 support, contract reviews | £50k IR35 cover incl. | 25% off first year |
| SG Accounting | £100 – £130 | FreeAgent included | IR35 reviews, status assessments | Fee protection incl. | 50% off first 3 months |
| Aardvark Accounting | £99 – £140 | FreeAgent included | IR35 contract checks | Professional indemnity incl. | 50% off first 6 months |
| Gorilla Accounting | £125 – £175 | FreeAgent included | IR35 reviews, Qdos partnership | IR75 cover via Qdos | 50% off first 3 months |
| Carrington Dean | £130 – £180 | FreeAgent or Xero | IR35 support & reviews | Fee protection incl. | First month free |
Detailed Firm Profiles
Nixon Williams
Nixon Williams is one of the longest-established specialist contractor accountants in the UK. They have been serving limited company contractors for over 25 years and are consistently rated among the top firms on Trustpilot (4.8/5). Their standard package includes FreeAgent accounting software, unlimited IR35 contract reviews, and £100,000 of IR35 insurance — a significant benefit that alone can justify the monthly fee if HMRC ever opens an enquiry. Nixon Williams offer 50% off the first 6 months for new clients. Their IR35 expertise is industry-leading, and they work closely with Qdos to provide independent contract assessments.
InTouch
InTouch is another well-established name in contractor accounting, founded in 2007 and now serving over 5,000 contractors. InTouch is known for its transparent flat-fee pricing — they publish their full fee schedule online with no hidden charges. FreeAgent is included at all package levels, and they provide dedicated account managers rather than a pooled support team. Their IR35 support includes contract reviews and status assessments, and they include £50,000 of IR35 insurance. InTouch offers a 25% discount on the first year's fees. Contractors praise their responsive support and clear communication, especially around complex IR35 scenarios.
SG Accounting
SG Accounting has grown rapidly in recent years and now competes with the bigger names on both price and service. Their standard fee starts at just £100/month — one of the most competitive rates in the market — and includes FreeAgent, VAT returns, payroll, and year-end accounts. IR35 contract reviews and status assessments are included in the package, along with fee protection insurance. SG Accounting offers 50% off the first 3 months. They are particularly popular with contractors who are just starting up and want a low-cost, no-frills service that still covers all the essentials. Their IR35 knowledge is solid, though they recommend independent Qdos reviews for complex determinations.
Aardvark Accounting
Aardvark Accounting positions itself as a modern, tech-forward alternative to traditional contractor accountants. Their online platform integrates seamlessly with FreeAgent, and they emphasise a streamlined, paperless onboarding process. Monthly fees start from £99/month — the lowest entry point among the firms we reviewed — and include FreeAgent, VAT returns, payroll, year-end accounts, and personal tax returns. IR35 contract checks are included, and professional indemnity insurance is provided. Aardvark offers 50% off the first 6 months for new clients. Their customer service is rated highly, though some contractors note that IR35 insurance beyond basic cover is not included in the standard package.
Gorilla Accounting
Gorilla Accounting is a well-known brand in the contractor space, particularly for IR35-comprehensive support. They partner with Qdos — the UK's leading IR35 specialist — to provide independent contract reviews and IR35 status assessments. Their fee range is slightly higher than average (£125–£175/month), reflecting the enhanced IR35 support and the Qdos partnership. FreeAgent is included, and Gorilla also offers additional services like R&D tax credits, Capital Gains Tax planning, and company formations. Their IR75 insurance via Qdos covers up to £75,000 of HMRC enquiry costs. Gorilla offers 50% off the first 3 months. They are a strong choice for contractors who prioritise IR35 protection and are willing to pay a premium for it.
Carrington Dean
Carrington Dean is a larger accountancy firm that serves both contractors and small businesses. Unlike the other firms on this list, they offer a choice of FreeAgent or Xero — giving you flexibility if you prefer one platform over the other. Their monthly fees are at the higher end (£130–£180/month), reflecting the larger-firm infrastructure and dedicated account manager model. IR35 support and contract reviews are included, and fee protection insurance covers HMRC enquiry costs. Carrington Dean offers the first month free for new clients. They are a good fit for contractors who want a more traditional, full-service accounting relationship with a larger team behind them, especially if you value face-to-face meetings or telephone support over online-only communication.
Key Features to Compare Between Firms
When comparing contractor accountants, here are the specific features to check before signing up:
- Software included: FreeAgent is the most common choice, but some firms offer Xero or a choice of both. Confirm whether the software is included in the monthly fee or charged separately (usually £25–£30/month if billed separately).
- Personal tax return: Some firms include your self-assessment in the monthly fee; others charge £100–£250 extra annually. Check before signing.
- Company formation: Most contractor accountants offer free company formation when you join, including company registration with Companies House, a business bank account introduction, and HMRC registration.
- VAT Flat Rate Scheme advice: Ensure the accountant actively reviews whether you are on the correct VAT scheme and switches you if your cost structure changes.
- IR35 insurance detail: Check the coverage limit (£50k vs £100k), whether it covers HMRC legal costs only or includes your own legal representation, and whether there is an excess.
- Notice period and exit process: Most firms operate on a 30-day notice period. Confirm whether there is a setup or exit fee.
Important: A contractor accountant's value is not just in the monthly fee — it is in the tax savings they unlock. A good accountant can save you £1,000–£3,000+ per year through efficient salary and dividend planning, VAT scheme optimisation, pension contribution advice, and IR35 compliance. The cheapest accountant may not always be the best value if they miss planning opportunities.
Contractor Accountant vs Umbrella Company: When to Choose Which
If you are trying to decide between operating through a limited company with a contractor accountant versus working through an umbrella company, the key factors are your IR35 status and how much control you want over your finances:
- Outside IR35: A limited company with a contractor accountant is almost always the most tax-efficient route. You can take a small salary and draw the rest as dividends, pay corporation tax on retained profits, and make pension contributions from the company. See our umbrella vs ltd guide for a detailed comparison.
- Inside IR35: The tax advantage of a limited company largely disappears because your deemed salary is taxed through PAYE like employment income. Many contractors inside IR35 choose an umbrella company for simplicity — but if you already have a limited company and want to keep it open (for future outside-IR35 contracts or multiple contracts), a reduced-rate 'inside IR35' accountant package makes sense.
- Cost comparison: A contractor accountant costs £100–£180/month plus your company's filing fees and bank charges. An umbrella company charges £80–£140/month. The monthly cost is similar — the deciding factor is tax efficiency, which depends on your IR35 status.
Read our full guide on IR35 for an in-depth explanation of how your status affects your take-home pay, and use our inside IR35 and outside IR35 calculators to model both scenarios with your specific day rate.
Compare Your Take-Home Pay
See exactly how much you could take home operating through a limited company compared to an umbrella — with every deduction explained for inside IR35 and outside IR35 scenarios.
Try the Umbrella vs Ltd Calculator →Frequently Asked Questions
Sources
- Off-payroll working (IR35) guidance — GOV.UK
- Tax on dividends — GOV.UK
- VAT Flat Rate Scheme — GOV.UK
- Making Tax Digital — GOV.UK
- FreeAgent accounting software