Accountants for Contractors UK 2026

Most UK contractors trade through their own limited company. That turns “contractor accountant” into a specific, higher-stakes version of ordinary limited company accountancy. Income arrives contract by contract rather than as a steady salary. IR35 status sits over every new engagement. The salary-versus-dividend split has to be revisited every time day rates change. A general accountant can file the paperwork correctly. A contractor specialist has usually already seen the specific problems: a client insisting on inside-IR35 terms, a gap between contracts, a decision about whether an umbrella company would actually suit better.

This guide covers what a contractor accountant handles that a general practice accountant may not. It sets out the monthly-package pricing model most contractors use, the structural questions IR35 raises when weighing up limited company versus umbrella, and what to check before signing with a firm. Every price below comes from published 2026 rate cards for UK limited company accountancy, cross-checked against our wider accountant costs guide. No contractor-specialist firm in our fact file publishes fixed pricing openly, which is why we use the general rates instead.

Why Contractor Accountancy Is a Distinct Specialism

Contracting through a personal limited company looks, on paper, like running any other small company. There are annual accounts, a Corporation Tax return, and a confirmation statement: the filings any limited company owes Companies House and HMRC. What makes it different in practice is the shape of the income sitting behind those filings. A contractor’s revenue arrives contract by contract. Sometimes that means one client for years; sometimes it means several short engagements in one tax year. The salary-versus-dividend split that makes limited company trading tax-efficient needs revisiting every time that pattern changes. Layered over all of it is IR35: the question of whether HMRC would treat a given engagement as employment if the contractor worked for the client directly. A contractor accountant deals with this routinely. They review new contracts before they start and adjust drawings as day rates change, rather than treating it as an unusual client once a year.

That routine familiarity is the actual product being sold. A general practice accountant files a limited company’s accounts correctly whether the company sells software, runs a shop, or exists purely to contract out one person’s time. A contractor specialist has usually already handled the situations that come up in contracting careers specifically. That might be a client who insists on inside-IR35 terms, a three-month gap between contracts, or a decision about whether trading through a limited company still makes sense at all. That’s different from general experience with limited companies. Our wider guide to what an accountant actually does covers the baseline filing set any limited company needs.

What a Contractor Accountant Handles That a General Accountant May Not

A general practice accountant and a contractor specialist file broadly the same paperwork: annual accounts, a Corporation Tax return, a confirmation statement, and usually a director’s own Self Assessment. The work around those filings differs, though. Contractor accountants typically review new contracts for IR35 risk before a contractor signs them, rather than only assessing status after the fact. They advise on how much to draw as salary versus dividends when income is irregular. They help build a buffer for quiet periods between contracts, rather than assuming steady monthly revenue. Many also offer, or work alongside, an IR35 contract review service specifically. Status depends on the wording and working practices of each individual engagement, not on the contractor’s trade generally. None of this changes what gets filed. It changes how much the accountant can usefully say before a decision is made, rather than after one.

That proactive layer is what separates a contractor accountant from a firm that happens to also serve contractors. A cheaper generalist can still file a correct set of accounts. What it typically can’t do is flag, before a contract is signed, that its terms read as inside IR35. It’s also less likely to quickly model what a rate change does to take-home pay once salary, dividends and Corporation Tax are all accounted for. Our guide to what a limited company needs from an accountant sets out the full baseline filing set that both a generalist and a contractor specialist share.

The Monthly Package Model Contractors Typically Use

Most contractor accountants price on a monthly retainer rather than a one-off annual fee. A contracting relationship usually runs for years, rather than closing after one filing. No firm in our fact file publishes pricing labelled specifically “for contractors”. The figures below are the general limited company rates a contractor retainer will sit close to, plus the add-ons a contractor is more likely than most companies to need. Treat these as a floor, not a contractor-specific quote. Ask any firm you’re considering whether IR35 support is already included, or priced separately.

The gap between £39.50 and £185 a month is mostly about how much proactive advice is bundled in, not how many forms get filed. A contractor drawing a stable day rate from one client for years may need little beyond accurate filing and a status review at contract renewal. A contractor moving between shorter engagements gets more value from a package built around regular contact. The same is true for anyone weighing up several offers with different IR35 terms.

Understanding IR35 and Why It Matters to Contractors

IR35, also called the off-payroll working rules, is HMRC’s test of employment status. It asks whether a contractor working through their own limited company would, in practice, be an employee if they worked for the end client directly. An engagement judged to fall inside IR35 is taxed differently to one judged to sit outside it. That’s why status matters before a contract is signed, not after. Responsibility for making that determination shifts depending on who the client is. For engagements with public sector bodies, and with medium and large private sector clients, the end client is generally responsible for assessing status. For engagements with smaller private sector clients, responsibility typically stays with the contractor’s own company. The rules are contract-specific and have changed over time. This section describes the mechanism only. It does not, and cannot responsibly, tell you whether a specific engagement sits inside or outside IR35.

Getting that judgement right, or getting professional help to get it right, is exactly the kind of service a contractor accountant is more likely to offer than a general practice firm. Many contractor specialists provide a contract review as a discrete service. They check working practices and contract wording against the current tests before a contractor signs. Status genuinely depends on the specific engagement, and it can change from one contract to the next. GOV.UK’s own guidance and a professional review of your actual contract are the only reliable ways to determine where a given engagement sits. A guide like this one cannot do that for you.

Umbrella Company or Limited Company: The Structural Decision

Contractors who don’t want to run a limited company at all can instead work through an umbrella company. An umbrella employs the contractor and pays them a salary through PAYE for each assignment, deducting tax and National Insurance before it reaches them. That removes the accountancy relationship this guide has been describing almost entirely. There’s no annual accounts filing, no Corporation Tax return, and no confirmation statement, because there’s no separate company. What it also removes is flexibility: control over how and when income is drawn, and the ability to retain profit inside the company between contracts. The decision sits on a genuine trade-off rather than a right answer. It’s lower administrative overhead with no accountancy relationship to manage, against the flexibility a limited company can offer once contract volume and rates justify running one.

IR35 sits underneath this decision too. Some contractors end up working through an umbrella specifically because a client has determined that a given engagement falls inside IR35. That client won’t engage the contractor’s limited company on outside-IR35 terms for that assignment. Others choose limited company trading deliberately, and use it across multiple outside-IR35 engagements over several years. Either way, this is a structural choice worth making with an accountant or IR35 specialist, not a decision to make from general pricing alone. If gaps between contracts are the real concern, our guide to self-employed business loans covers financing options for exactly that kind of income gap.

What to Look For When Choosing a Contractor Accountant

Price alone is a poor way to compare contractor accountants, because the headline monthly fee rarely reflects how much proactive support is bundled in. These are the questions worth asking before signing, alongside the price:

• Does the package include IR35 contract reviews – or is it priced as a separate add-on each time a new contract needs checking?
• Is director Self Assessment included – or billed on top, typically around £10 plus VAT a month per director at firms that itemise it?
• How is payroll for your own salary handled – a director drawing a PAYE salary from their own company still needs it processed correctly; see our guide to running payroll for what that involves.
• Can you reach someone between filings – a £39.50 monthly retainer and a £185 advisory package both file the same forms, but only one is built around ongoing contact.
• What happens between contracts – ask whether the firm’s fee assumes continuous trading or can flex if income gaps for a few months.

Our roundup of the best online accountants compares several firms on service quality rather than price alone, which matters more for a contractor relationship than for a one-off annual filing. A firm that answers IR35 questions quickly during the year is worth more to most contractors than one that’s marginally cheaper but only available at renewal.

What’s Usually Charged Separately

Even a well-chosen monthly package rarely includes everything a contractor needs in a given year. These are the jobs most commonly billed on top, based on published UK accountancy pricing:

• Director Self Assessment – £10 plus VAT a month per director at firms that itemise it, on top of the company fee.
• VAT returns – £29 to £30 per return once turnover crosses the £90,000 registration threshold and quarterly filing starts.
• Payroll for a director’s own salary – typically around £5 a month, the same rate charged for any single-employee payroll run.
• Confirmation statement – £39 to £85 a year, plus the separate Companies House filing fee.
• IR35 contract reviews – priced individually at firms that don’t bundle status checks into the standard package.

None of these add-ons is unusual, and none is a sign of a bad accountant – they reflect real, separate pieces of work. What matters is knowing which ones your likely usage pattern will actually trigger before comparing headline prices between firms. A contractor VAT-registered and running their own PAYE salary will hit most of the list above every year; one below the VAT threshold with no other employees will hit far fewer of them, which is worth factoring in before assuming the cheaper headline retainer is the cheaper year overall.

Clara Wenslow

Finance & Business Services Editor

Clara analyses SME finance and procurement markets, covering business loans, invoice finance, payroll, and related B2B services. She ensures each comparison and guide is transparent and data-driven.

Reviewed by

Sarah Mitchell

B2B Commerce & Finance Reviewer