IR35 accounting for contractors

Top Rated on BarkTop Rated on Bark★★★★★
TOP-RATED CONTRACTOR ACCOUNTANT

IR35 Accounting for Contractors, Done Properly

I work with limited company contractors across the UK to review IR35 status, assess working practices, and make sure every filing obligation is met on time.

You deal directly with me, David, from the first call onwards. Fixed price. Same-day responses. No handoffs to anyone else.

★★★★★Verified Bark Review

“Spoke with David on the phone and knew instantly he was the one I wanted to go with. Spoke me through everything and any questions I had I just messaged him and he replied right away. Would highly recommend.”

John Brennan · verified client
David Roseweir, IR35 accountant for contractors at STZ Accounting
48 verified 5-star reviews on Bark
Over 25 years of real business experience before qualifying
100+ businesses served across the UK
Same-day responses as standard
Fixed price quotes, no surprise invoices

Is your IR35 position as solid as you think?

Answer five quick questions and get a clear picture of where your risk actually sits.

WHAT I DO

What I handle on your behalf

From contract reviews and corporation tax to self assessment and payroll, I cover everything a limited company contractor needs under one fixed monthly fee.

01

IR35 Status and Contract Review

Before you sign anything, I review your contractual terms and working practices against the key IR35 tests: substitution, supervision, direction and control, and mutuality of obligation. If the contract wording creates risk, I tell you plainly and explain what needs to change. You get a clear picture before you commit to the engagement.

Included in contractor plans
02

Limited Company Accounts and Corporation Tax

I prepare your year-end accounts and corporation tax return, making sure every allowable expense is captured and your bill is no higher than it needs to be. If your status determination moves you inside IR35 part-way through the year, I account for that correctly so there are no nasty surprises at filing. Everything is filed on time, every time.

Filed on time, every year
03

Self Assessment and Payroll

Most contractors take a salary and dividends from their limited company, which means a self assessment return is required alongside your company filing. I handle both, including any adjustments needed if you have had an inside-IR35 engagement during the year. Your payroll submissions go to HMRC on time each month via RTI.

Coordinated and accurate
WHY IT WORKS

Why clients come back every year

Three things that make a real difference when IR35 is in the picture.

You always speak to David directly

IR35 questions are not simple. When you call or message, you need someone who knows your situation, not a junior who has to pass your query along. I handle every client personally, with no handoffs, no call centres, and no waiting days for a reply. Same-day responses are standard, not a premium add-on.

25 years of real business experience behind the advice

I spent over 25 years running and working in real businesses before I qualified as an accountant. That means when I review a contract, I am thinking about how the working relationship actually functions day-to-day, not just what the paperwork says. HMRC looks at the reality of the engagement, and so do I.

Fixed prices, so you know exactly where you stand

Contractors are used to unpredictable tax bills. My fees are not one of those unpredictable things. You get a fixed monthly price that covers everything we have agreed, quoted in writing before we start. If something changes, I tell you first. There are no surprise invoices.

FROM CLIENTS I WORK WITH

What clients say

★★★★★

“I needed some advice and help with an urgent matter. I phoned several people who said they could not do it. David answered the phone and said no problem at all. Everything was done in 24 hours. I highly recommend STZ Accounting.”

C. Mackenzie
Verified Bark Review
★★★★★

“David has been absolutely fantastic from start to finish — very efficient, knowledgeable and understanding, and all work completed within the reasonable agreed fixed quote.”

Suraen Mayor
Verified Bark Review
★★★★★

“I’ve used David the past 3 years for my tax return, every year it has been a pleasure and completely stress free — any questions I have he gets back same day. I would highly recommend David to anyone in need of an accountant!”

Liam Turnbull
Verified Bark Review
GETTING STARTED

How it works

Four straightforward steps from first contact to fully sorted.

01

Book a free call

Use the booking link to pick a time that suits you. There is no charge for the call and no obligation to proceed. It usually takes around 20 minutes and covers your current contract situation, your company setup, and what you need help with.

02

I review your position

Once I understand your situation, I look at your contracts, your working practices, and your current filings. I will tell you clearly where any IR35 risk sits, what your obligations are, and what I recommend. You get plain-English answers, not hedged legal language.

03

We agree a fixed price

I quote you a fixed monthly fee based on what you need. That covers everything we have discussed, with nothing left in small print. You know exactly what you are paying before anything starts.

04

I take it from there

I handle your accounts, tax returns, payroll and any IR35 correspondence with HMRC. Every deadline is tracked. You hear from me when there is something you need to know. Otherwise, I get on with it and you get on with contracting.

COMMON QUESTIONS

Common questions

HMRC looks at the reality of the working relationship, not just what your contract says. The key tests are whether you have a genuine right of substitution, whether the client controls how and when you work, and whether there is mutuality of obligation between engagements. I review both your contractual terms and your actual working practices together, because HMRC does exactly the same thing.
If your client is a medium or large business, they are responsible for issuing a Status Determination Statement. If they determine you are inside, income tax and employee National Insurance are deducted from payments to your company before you receive them, and the client or agency pays employer National Insurance on top. You still need to file a self assessment return and manage your company accounts correctly. I handle all of that.
Yes. The off-payroll working rules include a client-led disagreement process. You can formally represent that the determination is wrong, and the client must respond within 45 days. The strength of your challenge depends on the actual contractual and working practice evidence. I can help you put that case together.
From 6 April 2026, new rules shift tax liability up the supply chain in labour arrangements that include umbrella companies. Agencies and end clients can be held responsible if an umbrella company fails to operate PAYE correctly, with no straightforward defence. If you are currently working through an umbrella, this is worth reviewing. We can look at whether your IR35 status could support an outside determination and a return to your limited company structure.
David Roseweir, STZ Accounting

Have a question for David?

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