Self-Employed Consultant
Tax & IR35 Guide
Sole trader vs limited company, IR35 and off-payroll rules, dividend vs salary and allowable expenses explained for UK independent consultants.
Estimate your tax as a self-employed consultant
Adjust the figures to see your estimated Income Tax and Class 4 National Insurance for the year.
Total turnover before expenses
Under £1,000 we use the trading allowance automatically
Estimated tax bill
£12,629
19.4% effective rate for 2026/27
- Income tax
- £10,232
- Class 4 NI
- £2,397
Take-home pay
£44,371
after tax, NI and expenses
This is an estimate using HMRC-confirmed rates for 2026/27, not your official tax calculation. TapTax is MTD-compatible, so you can connect to HMRC and file the real figures in a couple of taps.
- A consultant's tax outcome is shaped first by structure (sole trader versus limited company) and, for company consultants, by IR35 status, far more than by the expense list.
- Sole traders are not subject to IR35 at all, which is a genuine simplification; the off-payroll rules only apply to work done through an intermediary such as a personal service company.
- Consultants with several clients, real control over the work and a right of substitution are usually well placed to sit outside IR35, unlike single-client interim roles that resemble employment.
- Through a company on outside-IR35 work, a small salary plus dividends is usually most efficient, but dividends carry only a £500 allowance in 2026/27 before 10.75%, 35.75% and 39.35% rates.
- MTD for Income Tax reaches sole-trader consultants from April 2026 above £50,000, April 2027 above £30,000 and April 2028 above £20,000; company consultants follow corporation tax rules instead.
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.
How a Consultant Is Taxed
The mechanics depend on your structure.
As a sole trader, you pay Income Tax on profit, meaning fees minus allowable expenses. For 2026/27 the personal allowance covers the first £12,570, then it is 20% to £50,270, 40% to £125,140 and 45% above. Class 4 National Insurance is 6% on profit between £12,570 and £50,270 and 2% above, with Class 2 collected through Self Assessment. The personal allowance tapers away between £100,000 and £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.
Sole Trader or Limited Company?
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 £30,000 to £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: When It Applies to Consultants
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.
- IR35 (off-payroll working rules)
- Anti-avoidance rules that test whether someone working through an intermediary, usually a personal service company, is genuinely in business or is effectively an employee of the client. Outside IR35 means the company can extract money tax-efficiently through dividends. Inside IR35 means most of the income is taxed like employment, with PAYE and National Insurance applied before the company is paid. Status is judged contract by contract on control, the right of substitution and mutuality of obligation. Sole traders are not within IR35 at all.
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.
Dividend versus Salary
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 2026/27 the tax-free dividend allowance is just £500, after which dividends are taxed at 10.75% in the basic-rate band, 35.75% 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.
Allowable Expenses for Consultants
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 |
What You Cannot Claim
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.
VAT for Consultants
You must register for VAT once taxable turnover exceeds £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.
Worked Example: A Sole-Trader Consultant on £70,000
Take an independent management consultant trading as a sole trader, billing £70,000 across the year with several clients, working mainly from home.
Income: £70,000
Allowable expenses:
- Professional indemnity insurance and memberships: £1,400
- Laptop, monitor and phone (AIA, claimed in full): £1,800
- Software and research subscriptions: £900
- Home-office actual-cost proportion: £1,700
- Business travel to client sites: £2,200
- Marketing and website: £800
- Accountancy fees: £1,200
- Total expenses: £10,000
Taxable profit: £70,000 minus £10,000 = £60,000
Income Tax: the first £12,570 is tax-free; £12,570 to £50,270 is taxed at 20% (£7,540); £50,270 to £60,000 is taxed at 40% (£3,892), giving roughly £11,432.
Class 4 NIC: 6% on profit between £12,570 and £50,270 (about £2,262), plus 2% on the £9,730 above (about £195), giving roughly £2,457.
Total tax and NIC: around £13,889 for the year. At £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.
MTD for Income Tax: What Applies to Consultants
Making Tax Digital for Income Tax applies to sole traders and landlords, not limited companies, on this timetable:
- April 2026: Combined trading and property income over £50,000
- April 2027: Over £30,000
- April 2028: Over £20,000
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.
Common Mistakes Consultants Make
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 £100,000 allowance taper. High-earning consultants nearing £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 £500 dividend allowance and a 35.75% higher-rate charge, taking too much in one year is expensive. Plan the split across the tax year.
People also ask
Quarterly expenses under MTD: the £90,000 rule
If your annual business turnover is £90,000 or less, HMRC lets you report a single consolidated expenses total in each Making Tax Digital quarterly update instead of breaking expenses down into itemised categories. Most self-employed consultant businesses are under this threshold, so a quarterly update can be as simple as two figures: total income and total expenses. You still need to keep digital records of each individual expense - the relaxation only changes how much detail goes into the quarterly update itself.
Frequently asked questions
Calculators for self-employed consultants
Helpful guides
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