Sole trader vs limited company, IR35 and off-payroll rules, dividend vs salary and allowable expenses explained for UK independent consultants.
Independent consulting covers an enormous range, from a solo strategy adviser with a handful of clients to an interim operations director embedded in one business for a year. That range is exactly why tax is more nuanced for consultants than for most trades. The right structure and the IR35 position depend on how you actually work, not on the job title on your invoice. A consultant who genuinely runs a business serving multiple clients sits in a very different place from one who effectively does a single client's job under their direction.
Two structural decisions dominate everything else. The first is whether to operate as a sole trader or through a limited company. The second, which only matters if you use a company, is whether each engagement falls inside or outside IR35. Get those right and the expense list, while worth claiming in full, is a footnote by comparison. This guide works through both, then covers the costs, VAT and MTD points that follow.
The mechanics depend on your structure.
As a sole trader, you pay Income Tax on profit, meaning fees minus allowable expenses. For 2025/26 the personal allowance covers the first GBP 12,570, then it is 20% to GBP 50,270, 40% to GBP 125,140 and 45% above. Class 4 National Insurance is 6% on profit between GBP 12,570 and GBP 50,270 and 2% above, with Class 2 collected through Self Assessment. The personal allowance tapers away between GBP 100,000 and GBP 125,140 of income, creating an effective 60% marginal rate in that band, which high-earning consultants frequently hit.
Through your own limited company, the company invoices clients, pays corporation tax on profit, and you draw money out as a small salary plus dividends. On work that sits outside IR35 this is normally the more tax-efficient route once profit is well into higher-rate territory, because dividends carry no National Insurance and have their own lower rates.
Scottish consultants pay Scottish Income Tax on sole-trade profit and on any salary across six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) with an S-prefixed code, while National Insurance and dividend tax stay UK-wide. Welsh taxpayers carry a C-prefixed code at rates currently matching the rest of the UK.
The Ltd-versus-sole-trader calculator compares both routes on your own profit figure, and the dividend versus salary calculator helps tune the extraction mix if you incorporate.
This is the first big decision and, for many consultants, the most consequential. As a sole trader your profit is taxed through Income Tax and Class 4 NIC in the year it arises, you have light admin, and, importantly, you are not subject to IR35 at all. As a limited company you pay corporation tax and then extract money as salary plus dividends, which can lower the overall tax take once profit is comfortably into higher-rate territory, but you take on corporation tax returns, statutory accounts, a Confirmation Statement, payroll and the IR35 question on every engagement.
As a rough guide, below around GBP 30,000 to GBP 40,000 of profit the savings rarely justify the company's burden, and the simplicity and IR35-immunity of sole-trader status often win. Above that, incorporation becomes worth modelling seriously, especially for a consultant with clearly outside-IR35 work and steady profit. Run your numbers through the Ltd-versus-sole-trader calculator before committing either way.
IR35, the off-payroll working rules, only bites where you supply your services through an intermediary, typically a personal service company, and the engagement looks like disguised employment. A sole-trader consultant is outside the rules entirely. A company consultant must assess each contract.
The good news for many consultants is that genuine consulting is often well positioned to fall outside IR35. Three factors carry the most weight. Control: do you decide how, when and where the work is done, or does the client direct you like an employee? Substitution: could you send another suitably qualified consultant in your place? Mutuality of obligation: is the client bound to offer work and you to accept it? A consultant with several clients, delivering defined outcomes on their own terms, looks genuinely in business. The risk sits at the other end of the spectrum: a long, full-time interim role where you sit in the client's management structure and take day-to-day direction can look very much like inside-IR35 employment.
Who makes the determination matters too. For contracts with medium and large private-sector clients and all public-sector bodies, the end client (or the fee-payer in the chain) decides status and must issue a Status Determination Statement. For small private-sector clients, your own company assesses the engagement. The IR35 calculator shows how a given day rate translates to take-home inside versus outside the rules, and the full mechanics, with what each outcome does to your pay, are set out in our IR35 inside vs outside guide.
If you incorporate and your work sits outside IR35, the question becomes how to pay yourself. The usual pattern is a modest salary, often set to secure a qualifying year toward the state pension and use the personal allowance efficiently, then dividends for the rest. Dividends are attractive because they carry no National Insurance, but in 2025/26 the tax-free dividend allowance is just GBP 500, after which dividends are taxed at 8.75% in the basic-rate band, 33.75% in the higher-rate band and 39.35% above. Corporation tax has already been paid on the profit those dividends come from, so the effective combined rate must be looked at in the round. The dividend versus salary calculator finds the split that minimises total tax on a given level of company profit.
An expense is allowable when incurred wholly and exclusively for the business (and, for some categories through a company, necessarily). The consultant's list is dominated by professional and knowledge costs rather than equipment.
| Expense | What qualifies | Notes |
|---|---|---|
| Professional indemnity insurance | PI cover for advice and contract claims, often required by clients | Fully deductible and frequently contractual |
| Professional memberships | Chartered institute or professional body subscriptions relevant to your field | Deductible where on HMRC's approved list or genuinely required |
| Equipment | Laptop, monitor, phone, home-office hardware | Claimed via the Annual Investment Allowance (sole trader) or capital allowances (company) |
| Software and research | Productivity tools, data and research subscriptions, design and analysis software | Deductible running costs |
| Home-office costs | Flat-rate working-from-home allowance, or a fair proportion of heat, light, broadband and rent or mortgage interest | Choose the method giving the larger fair deduction |
| Business travel and subsistence | Genuine travel to client sites and reasonable subsistence; restricted on inside-IR35 work and to a regular workplace | Check before claiming commuting-style travel |
| Training and CPD | Courses that maintain or update your existing expertise | Training into an unrelated new field is restricted |
| Marketing and website | Website, branding, advertising, networking and outreach tools | Fully deductible |
| Subcontractor fees | Associates or specialists you pay to deliver part of an engagement | Direct cost of the work |
| Accountancy and bank fees | Bookkeeping, accounts, Self Assessment or company filing, business banking | Fully deductible |
Client entertaining, including taking a prospect to lunch, is generally not deductible for tax even though it is a real business cost. Everyday business clothing is never allowable. The personal share of a dual-use phone, laptop or broadband connection must be excluded, and travel to a single regular workplace can fall outside the rules in the same way as an ordinary commute.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period, and a full-time consultant on a healthy day rate can pass that comfortably. Where your clients are VAT-registered businesses, which is common for consultants, registration adds admin but little real cost, because those clients reclaim the VAT you charge, and you in turn reclaim VAT on your own costs. Consultants serving smaller, non-VAT-registered clients or the public should weigh the price impact more carefully, as registration effectively makes your fees 20% higher to anyone who cannot reclaim. The Flat Rate Scheme rarely benefits low-cost consultancy businesses, who are usually limited-cost traders on a 16.5% flat rate.
Take an independent management consultant trading as a sole trader, billing GBP 70,000 across the year with several clients, working mainly from home.
Income: GBP 70,000
Allowable expenses:
Taxable profit: GBP 70,000 minus GBP 10,000 = GBP 60,000
Income Tax: the first GBP 12,570 is tax-free; GBP 12,570 to GBP 50,270 is taxed at 20% (GBP 7,540); GBP 50,270 to GBP 60,000 is taxed at 40% (GBP 3,892), giving roughly GBP 11,432.
Class 4 NIC: 6% on profit between GBP 12,570 and GBP 50,270 (about GBP 2,262), plus 2% on the GBP 9,730 above (about GBP 195), giving roughly GBP 2,457.
Total tax and NIC: around GBP 13,889 for the year. At GBP 60,000 of profit, with steady outside-IR35-style work, this consultant is in the band where incorporating could start to pay off through a salary-plus-dividends split, so the Ltd-versus-sole-trader calculator is worth running before the next tax year. If they incorporated, the dividend versus salary calculator would then guide the extraction mix.
For a consultant, the money is made in two decisions: sole trader or company, and, if a company, inside or outside IR35. Those choices dwarf anything on the expense schedule.
Making Tax Digital for Income Tax applies to sole traders and landlords, not limited companies, on this timetable:
A sole-trader consultant above the relevant threshold will keep digital records and send HMRC quarterly summaries through compatible software, then finalise the year. Consultants who trade through a limited company are outside MTD for Income Tax and follow corporation tax filing rules instead, which is one more factor in the incorporation decision. Even then, any personal sole-trade work or rental income you hold outside the company is tested against the thresholds above, so keep that recorded digitally too.
Incorporating too early. A limited company below modest profit usually costs more in admin and fees than it saves, and it imports the IR35 question that a sole trader avoids entirely.
Misjudging IR35 on interim roles. A long, full-time, client-directed engagement can be inside IR35 even if you call it consulting. Assess each contract on control, substitution and mutuality.
Trying to deduct client entertaining. It feels like a business cost, but entertaining is generally disallowed for tax. Keep it out of your claim.
Forgetting the GBP 100,000 allowance taper. High-earning consultants nearing GBP 100,000 of income hit an effective 60% marginal rate as the personal allowance tapers; a pension contribution is a common, efficient response.
Over-drawing dividends in a higher-rate year. With only a GBP 500 dividend allowance and a 33.75% higher-rate charge, taking too much in one year is expensive. Plan the split across the tax year.
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