Accountant for Contractors in London
Your contractor accounts, handled properly.
Running a limited company in London as a contractor means IR35 exposure, dividend planning, and a corporation tax bill that can catch you off guard if no one is watching. Supreme Consulting handles the compliance and keeps you informed throughout the year. Fixed-fee pricing, cloud-based from day one, and replies within one working day.
- IR35 status reviewed so you know where you stand
- Corporation tax and dividend split planned in advance
- Year-end accounts and CT600 filed without chasing you
- Director Self Assessment prepared with allowable expenses maximised
No long-term contract required. If the arrangement is not working after three months, you leave with clean, filed-up records and nothing outstanding.
Get a free contractor quote
Fixed-fee pricing. Reply within one working day.
What our clients say
★★★★★
Prompt, Clear, and Easy to Understand
“Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful.”
★★★★★
Good Results at a Reasonable Price
“Stuart is a thorough efficient worker who produces good quality results at a reasonable price.”
★★★★★
Advises Throughout, Not Just at Year-End
“Stuart holds your hand and advises throughout!”
★★★★★
Takes the Time to Explain Things
“They take the time to explain things.”
Sound familiar?
Still not sure what your tax bill will be?
Most contractors running a limited company in London are getting the basics done but not much else. The year-end accounts arrive, the CT600 gets filed, and somewhere in between you made dividend decisions without quite enough information. IR35 sits in the background as a question nobody has formally answered. That is a reasonable description of how a lot of contractor accounts are run.
- ✕ No clear view of your corporation tax liability until the bill lands
- ✕ IR35 status never formally reviewed, left as an open risk
- ✕ Dividend and salary split decided without advice on the tax consequences
What a well-run contractor setup looks like
The compliance gets done on time, the tax position is visible well before any deadlines, and IR35 is reviewed and documented. You know what to pay yourself and when, without having to ask twice.
- ✓ Corporation tax estimated quarterly so nothing catches you off guard
- ✓ IR35 status reviewed and documented for each engagement
- ✓ Optimal salary and dividend structure agreed at the start of each tax year
- ✓ Fixed monthly fee covering everything agreed in the scope, no surprise invoices
What clients say after switching to us
Contractors and small business owners who wanted clearer advice and less to worry about. A selection of what they found.
Stuart is a thorough efficient worker who produces good quality results at a reasonable price.
Very clear and gives excellent clarity on all situations when I am in doubt. Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful. They take the time to explain things.
What the fixed fee covers for contractors
Core compliance as a baseline, with advisory layered in where it matters. Everything is scoped clearly before you start.
Compliance and Tax Filing
Year-end limited company accounts, corporation tax return (CT600), confirmation statement, and director Self Assessment are all included in the standard contractor package. Deadlines are tracked, and you will not be chased for information at the last minute. The tax position is communicated well in advance, not when the bill is overdue.
Included as standardIR35 Review and Advisory
Each contract engagement is reviewed against the IR35 legislation so your status is documented and defensible. You receive a plain-English written summary, not a hedged opinion. Where your working practices need adjusting to support outside-IR35 status, that is flagged before you sign rather than after.
Available as add-onPayroll, VAT, and Cloud Accounting
Monthly payroll and RTI submissions keep your PAYE records clean and your HMRC account current. VAT returns are prepared quarterly under Making Tax Digital requirements. All bookkeeping runs through Xero or QuickBooks Online, giving you a live view of your company’s position without waiting for a year-end summary.
Available as add-onConsistent feedback across different clients
Business owners across a range of sectors and sizes. The same themes come up: clear communication, practical advice, and no surprises.
Holds Your Hand and Advises Throughout
“I’m so grateful for the help received with my small cleaning business. Stuart holds your hand and advises throughout!”
Excellent Clarity on Every Situation
“Very clear and gives excellent clarity on all situations when I am in doubt. Communication is always prompt, professional, and easy to understand, which makes dealing with finances far less stressful. They take the time to explain things.”
Quality Results at a Reasonable Price
“Stuart is a thorough efficient worker who produces good quality results at a reasonable price.”
Why contractors choose us over a larger practice
A few things that make a material difference in practice, not just in a sales pitch.
IR35 is not an afterthought
A lot of accountants file the accounts and leave IR35 as something you worry about yourself. At Supreme Consulting, each engagement is reviewed against the current legislation and a written summary is produced. If your working practices need adjusting to support outside status, you find out before HMRC does.
Real-time visibility via cloud accounting
Your books run on Xero or QuickBooks Online, which means your financial position is current throughout the year, not just at year-end. You can see your corporation tax accrual, your VAT position, and your cash balance at any point without waiting for a quarterly report to land in your inbox.
Fixed fees with nothing hidden
The scope is agreed before you start and the monthly fee reflects exactly what is included. There are no hourly rates accumulating in the background and no invoice arriving after a phone call. If something falls outside the scope, that is discussed and quoted separately before any work begins.
Up and running in four straightforward steps
The onboarding process is designed to put the effort on us, not on you. Most contractors are operational within two weeks of their first call.
A no-obligation discovery call
A 20-30 minute call to understand your current setup, your contract situation, and what you actually need from an accountant. No preparation required on your part. You will leave the call knowing exactly what would be covered and at what price.
A clear, fixed-fee proposal
You receive a written proposal setting out the scope, the monthly fee, and what is and is not included. No vague descriptions of service levels. If you have questions about what is covered, they get answered before you commit to anything.
Onboarding and cloud setup
We handle the transfer from your previous accountant and migrate your records onto Xero or QuickBooks Online. HMRC authorisation, payroll migration, and software setup are managed without requiring more than an hour of your time.
Your accounts, running properly
From here, your compliance runs on schedule, your tax position is visible throughout the year, and questions get answered the day you ask them. The parts of running a limited company that most contractors quietly dislike are handled.
“I’m so grateful for the help received with my small cleaning business. Stuart holds your hand and advises throughout!”
Things contractors usually ask before starting
Do you actually understand how contractor limited companies work, including IR35 and dividend planning?
Yes. Contractor limited companies are one of the core client types we work with, which means IR35, the salary and dividend split, directors’ loan accounts, and corporation tax planning are day-to-day work rather than occasional territory. You will not need to explain how your company is structured before getting a useful answer.
What does contractor accountancy with Supreme Consulting actually cost?
Pricing is fixed-fee and agreed upfront based on the scope of services. A standard limited company package covering year-end accounts, CT600, confirmation statement, and director Self Assessment is quoted clearly before you commit. Payroll, VAT, bookkeeping, and IR35 reviews can be added and are priced separately. There are no hourly rates and no unexpected invoices.
My books are in some state of disarray from a previous accountant. Is that a problem?
It is a common starting point, frankly. We handle the catch-up work as part of onboarding, and the cost and timeline for bringing records current is quoted before any work begins. There are no surprises. Most contractors are fully onboarded within two to three weeks regardless of where the books are starting from.
Is there a long-term contract or minimum commitment period?
No minimum contract period. Services run on a monthly rolling basis. If you decide to leave, you receive all your records, filed returns, and login credentials in full. There is no retention of your data and nothing outstanding to settle beyond the current month’s fee.
I work through an umbrella company at the moment. Can you help me assess whether a limited company makes financial sense?
Yes. The comparison between umbrella and limited company depends on your day rate, how consistent your workload is, and your IR35 exposure. We can model the net financial difference for your specific situation during the discovery call and give you a clear answer rather than a general rule of thumb.
How far in advance will I know what my corporation tax bill is going to be?
With quarterly management accounts and ongoing bookkeeping in place, the corporation tax accrual is visible throughout the year, not just when the year-end accounts are prepared. Most clients know their approximate liability with six to nine months of the year still to run, which is enough time to make informed decisions about drawings, pension contributions, or investment.
Stop guessing what your tax bill is. Get it sorted.
Fixed-fee contractor accountancy for London-based limited companies. IR35 reviewed, compliance handled, and your tax position visible throughout the year.