How limited company accounting works for contractors is one of those things nobody explains properly until you’re already in it and feeling slightly out of your depth. If you’ve just incorporated, or you’re thinking about it, this is what I wish someone had told me to tell my clients from day one.

What Actually Changes When You Operate Through a Limited Company

When you’re a sole trader, your business income is your personal income. Tax is straightforward, even if it doesn’t always feel it. The moment you set up a limited company, you’ve created a separate legal entity, and that changes almost everything about how your money flows and how HMRC sees you.

The company has its own bank account, its own obligations, and its own tax bill called Corporation Tax (a tax on the company’s profits, currently set at 25% for most contractors). You, as the director, pay yourself through a combination of salary and dividends, and those are taxed differently from each other. Getting that split right is one of the biggest advantages of operating through a limited company, but it only works if it’s done properly.

What a Contractor Accountant Actually Does for You

There’s a difference between an accountant who works with businesses broadly and one who specifically understands how contracting works. The core tasks are similar: annual accounts, Corporation Tax return (the CT600 filed with HMRC), Companies House confirmation statement, payroll for you as a director, VAT returns if you’re VAT registered, and your personal Self Assessment tax return. Research from IT Contracting in 2026 shows most specialist contractor accountants bundle these into a fixed monthly fee, typically ranging from around £70 to £150 per month depending on what’s included.

What separates a contractor-focused accountant from a general one is the context they bring. They understand day rates, how project gaps affect your cash position, how to handle months where income drops, and how to structure your salary and dividends in a way that’s tax-efficient and defensible to HMRC. That last part matters more than most new contractors realise.

IR35: The Word That Follows Every Contractor Around

IR35 is tax legislation designed to stop people working as employees in practice but being paid as a limited company to reduce their tax bill. If HMRC decides your contract looks too much like employment, they can tax you as if you were a PAYE employee, which significantly increases your tax liability. It’s not a trap if you understand the rules, but it’s genuinely important to get right.

Since the off-payroll working rules expanded in 2021, many medium and large clients now determine your IR35 status themselves rather than leaving it to you. That makes it even more important to understand what inside IR35 and outside IR35 mean, and to make sure your contracts and working practices reflect genuine self-employment. A good contractor accountant won’t just mention IR35 in passing — they’ll help you understand where you stand on every engagement.

Is Paying for a Contractor Accountant Actually Worth It?

The honest answer is yes, for most contractors, and here’s why. The difference between an optimised salary and dividend split versus getting it wrong can easily run into hundreds or thousands of pounds a year in unnecessary tax. A contractor accountant who understands that structure pays for themselves relatively quickly, especially when you factor in the time you’d otherwise spend on it yourself.

On fees, according to IT Contracting’s 2026 comparison of specialist contractor accountants, the range sits broadly between £70 and £150 per month, with typical inclusions covering your annual accounts, Corporation Tax, Companies House filings, director payroll, VAT returns, and tax-efficient salary planning. If you’re billing a reasonable day rate, that monthly cost represents a small fraction of what you earn in a single day. The question isn’t really whether you can afford an accountant — it’s whether you can afford to get this wrong.