How to start a consultancy in the UK

Large employers continue to trim permanent overhead while funding discrete change projects. That bias favours external expertise with clear deliverables over open‑ended body‑shopping. Mid‑market firms (£10m–£250m turnover) are the sweet spot: they have budgets, board access and shorter procurement cycles than FTSE names. Typical day‑rate bands in 2026: strategy/operating model £900–£1,400; management/process £650–£950; marketing/growth £600–£900; technology/digital delivery £700–£1,100; HR/people £500–£800. London pays a premium; regulated sectors (financial services, health, utilities) pay for compliance rigour. Your earnings ceiling depends on utilisation, not absolute rate. A solo billing 140 days at £750 produces £105k top‑line; at 160 days, £120k. Add one trusted associate at 50% margin for 60 days and you’ve created another £22k–£25k contribution without lifting your own rate. The constraint is always consistent demand and on‑time cash collection, not capacity for meetings.

Horizontal labels (“strategy consultant”, “marketing consultant”) are weak. Pick a narrow problem, a vertical where the economics are obvious, and a promise that can be evidenced in 60–90 days. Examples: “Reduce paid media CAC by 20% for UK D2C retailers >£5m”, “Take legacy insurers live with a cloud claims stack in 16 weeks”, “Cut rostering costs 10% for private healthcare groups using workforce analytics.” Productise your first engagement: a time‑boxed diagnostic with a fixed price and a decision document the board can accept. Then upsell an implementation retainer at a predictable monthly fee. Build a one‑page capability map (diagnostic → design → delivery → enablement) and keep all offers inside that map. Procurement likes clarity: standard SoWs, insurance that matches the risk, and references that look like the buyer—same sector, same problem, similar scale.

In the UK, consultants typically pick sole trader (simpler, you = the business) or limited company (separate legal entity, potential tax efficiency, better with procurement). The financial break‑even point where a limited company generally nets you more than sole trader is around £35,000–£40,000 true profit, assuming you use a low director’s salary plus dividends and claim legitimate expenses. Limited companies carry admin (Companies House filings, Corporation Tax, payroll RTI) but are preferred by larger clients and help ring‑fence liability. Sole traders are fast to start and fine for micro clients but push you into Making Tax Digital for Income Tax from April 2026 if your trading income exceeds £50,000. If you plan to work via agencies or on larger programmes, a limited company with proper Professional Indemnity (PI) insurance will remove friction in supplier onboarding.

This is an unregulated profession, but some filings are non‑negotiable. HMRC: register as a sole trader (Self Assessment) or incorporate and register for Corporation Tax within three months of starting to trade. If you pay yourself via payroll, register PAYE and file Real Time Information (RTI). VAT: threshold is £90,000 rolling 12‑month taxable turnover; B2B consultants often register voluntarily to reclaim input VAT and look procurement‑ready. ICO: most consultancies must pay the data protection fee (£40–£60) and publish a privacy notice. Companies House: file a confirmation statement annually (£34) and keep a registered email/address. Health and Safety Executive (HSE): low‑risk office/home‑office operations have minimal duties, but you still need sensible DSE and lone‑working policies. If you rent an office, business rates (assessed by the Valuation Office Agency) may apply; Small Business Rate Relief can reduce or eliminate bills for rateable values up to £15,000 in England.

Off‑payroll rules (IR35) put the status decision on the client in the public sector (since 2017) and medium/large private sector (since April 2021). Small clients (Companies Act definition) are exempt; the contractor decides. For in‑scope engagements, the client must issue a Status Determination Statement (SDS). HMRC’s CEST tool is the official test; HMRC says it will stand by a CEST result if inputs are accurate and honest. The commercial difference is material: “inside IR35” means PAYE/NIC as if employed, usually via an umbrella or agency payroll; “outside IR35” means you invoice via your limited company. Clauses help but working practices decide—substitution, control and mutuality of obligation still matter. Dispute an SDS within the client’s process; they must respond in writing, typically within 45 days. Build your offer around deliverables, not hours, and maintain autonomy cues (your equipment, your methods, outcome‑based SoWs).

If you must work inside IR35, a compliant umbrella can be the least bad path. Pick one that pays PAYE, issues a Key Information Document (KID) under the Conduct of Employment Agencies Regulations, and is open about the rate uplift needed to cover employer costs (employer NIC at 13.8%, apprenticeship levy at 0.5%, holiday pay). Avoid anything mentioning loans, annuities, offshore trusts or “net pay 80%” claims—these are classic disguised remuneration schemes that HMRC continues to challenge in court. Membership of an industry body like FCSA is not regulation but a useful hygiene signal. Ask for a sample payslip and a full reconciliation from assignment rate to gross pay. If an agency offers you a “mini‑umbrella” arrangement with an unusual company name or foreign directors, walk away—HMRC has explicitly warned about mini‑umbrella fraud.

Procurement asks for certificates before they approve you in ERP. Professional Indemnity (PI) is table stakes: many corporates require £1m–£2m, some regulated sectors ask for £5m. Typical 2026 annual premiums for a low‑claims, one‑person UK consultancy: PI £1m limit £180–£400; PI £2m £250–£600; PI £5m £500–£1,200. Public Liability (PL) at £2m–£5m is often requested for site visits: £60–£200. Cyber liability (£100k–£1m) is increasingly a gate: £120–£350 depending on MFA, backups and client data volume. Shop the market: Hiscox, AXA and Markel underwrite widely; brokers and platforms such as Vouch, Superscript and PolicyBee package consultant policies with monthly payments and contract‑specific endorsements. Keep schedules aligned with SoW promises (jurisdiction, IP indemnities, sub‑contracting). Many tenders require you to confirm retroactive dates and run‑off cover; set reminders before renewal so there’s no gap in claims‑made PI.

You can start with a modern laptop, a decent webcam, and software that makes you fast. Expect a one‑off outlay of £1,200–£2,000 for a credible machine (ThinkPad/MacBook), £100–£200 for peripherals, and £300–£600 annually for domains, hosting and email. Software stack per month (ex‑VAT) in 2026: accounting (Xero/FreeAgent) £15–£36; e‑signature (DocuSign/Adobe) £8–£25; notes/PM (Notion/Trello/Asana) £0–£20; CRM (Pipedrive/HubSpot Starter) £20–£45; video (Zoom/Teams) £0–£12. Mobile and broadband together: £30–£60/month. Add £300–£800/year for CPD and membership if you value curated content over random LinkedIn takes. Don’t overspend on branding early; a fast, simple website with a proof‑stack (logos, quotes, metrics) outranks animation. If you rent workspace, budget for insurance endorsements and check business‑use clauses; business rates may apply unless you qualify for Small Business Rate Relief.

Your day rate is a derivative, not a strategy. Use the salary ×1.28 ÷ billable‑days rule to anchor a floor: if an employed peer earns £80k, 1.28× is £102,400; divided by 140 billable days gives ~£731/day just to break even on employer NIC, pension and holidays. Price against value where the outcome is clear; use retainers when the client wants ongoing stewardship; use fixed fees for tightly scoped deliverables. Sell a 2–3 week diagnostic (£5k–£12k) with clear acceptance criteria and an executive session. Proposals should be three pages: page 1 the commercial outcome and scope; page 2 approach and timeline; page 3 three‑tier pricing and terms. Anchor tiers at, say, £18k/£28k/£42k for a 6–10 week work‑package with explicit differences in speed, access and artefacts. Always decouple rate cards from outcomes in the narrative—buyers fixate on numbers when you make rate the headline.

Assume a one‑person limited company, outside IR35, VAT‑registered (VAT ignored in the figures), billing £108,000 a year (e.g., £750/day × 144 days). Typical annual costs: insurance £900; software £1,200; accountancy £1,200; travel £3,000; home office/telecoms £1,200; marketing £1,500; equipment/depreciation £600; professional fees £500; employer’s pension contribution £8,000; director’s gross salary £12,570; employer NIC on salary circa £480. Total costs roughly £31,150, leaving £76,850 profit before Corporation Tax. Corporation Tax for 2026 at this profit level is in the marginal band; expect around £16,600, leaving £60,200 post‑tax distributable profits. Pay these as dividends. With a £12,570 salary (using the personal allowance) and 2026 dividend rules (allowance £500; rates 8.75% basic, 33.75% higher), you’d see roughly £49,500 net dividends after dividend tax, plus the £12,570 salary gross—about £62,000 take‑home. Add the £8,000 pension as deferred pay. Small changes in costs, pension, and associate margin move this by several thousand either way.

VAT: compulsory at £90,000 rolling turnover; standard rate 20%. Voluntary registration is usually sensible for B2B because clients reclaim your VAT and you reclaim input VAT on costs. The Flat Rate Scheme can simplify returns but often costs more for consultants; model it before opting in. Corporation Tax: small profits rate 19% up to £50,000, main rate 25% above £250,000, with marginal relief in between. Director pay: many micro‑companies pay a salary around £12,570 (or secondary threshold to avoid employer NIC) and take the rest as dividends, now with only a £500 dividend allowance. Pensions via the company are CT‑deductible if wholly and exclusively for the trade. Sole traders enter Making Tax Digital for Income Tax from April 2026 if income >£50,000 (digital records and quarterly updates). Keep PAYE RTI filings on time; penalties for late submissions accrue monthly.

The fastest route to revenue is people who already trust you. Start with a named list of 50: ex‑colleagues, prior clients, partner agencies, and vendors whose tools you can implement. Run short, specific outreach: “I help UK [sector] do [outcome]; I’m booking two diagnostics next month—worth a chat?” Bring a 3‑page proposal template and a productised diagnostic so a buyer can say yes without writing a novel. Publish evidence, not opinions: 300‑word problem/approach/result mini‑cases on your site and LinkedIn; a monthly email that shows you’re doing the work beats viral takes. Speak where your buyers gather—trade associations, vendor webinars, niche Slack communities. Borrow reach with partners: co‑market with a software firm, share a webinar list, swap introductions with a non‑competing consultant. Pipeline compounding is real: one short talk with 80 of the right people outperforms six months of cold LinkedIn spam.

Delivery discipline wins renewals. Run weekly governance, show burndown against scope, and log decisions. Contracts should reflect outcomes: clear scope, client obligations, acceptance criteria, change control, and a liability cap (often at fees paid or 1×–2× project value). Own your IP in generic frameworks and grant the client a licence to use deliverables; carve out your methods and templates. Data: sign a sensible Data Processing Agreement when needed; keep PII out of email; use UK/EU data centres when buyers care. Invoices: set 14‑day terms unless the buyer dictates otherwise, and state statutory interest and fixed‑sum compensation under the Late Payment of Commercial Debts (Interest) Act 1998 (8% plus Bank of England base rate, and £40/£70/£100 per invoice depending on size). Disable perpetual scope creep by pricing change requests quickly and fairly. A clean acceptance process makes cash arrive faster than heroics do.

Once utilisation consistently exceeds ~70%, add capacity through trusted associates. Keep the client relationship, sell outcomes, and treat associates like suppliers with clear SoWs and rates. Typical UK associate splits for senior specialists are 60/40 to 70/30 in your favour after expenses when you originate and lead. Make IR35 part of your associate contracting: outcome‑based SoWs, genuine substitution rights, and independence cues. Protect quality with a short bench of 3–5 proven people per capability. Build a light partner model with agencies or boutiques where you trade introductions and white‑label delivery. Don’t add permanent payroll until you’ve got 6–9 months of forward revenue. If you rent space or take on staff, revisit insurance (EL is compulsory if you employ anyone) and check business rates with the VOA; use Small Business Rate Relief where eligible.

Most consulting startups don’t fail for lack of brains; they fail for lack of rhythm. They over‑customise proposals, under‑specify deliverables, and treat utilisation as an afterthought. They skip VAT registration when selling B2B and donate margin. They misread IR35, accept an “inside” rate without an uplift, and discover the umbrella maths in arrears. They neglect insurance and get stuck in onboarding purgatory. They price time, not outcomes, and end up selling more days than change. Fixable, all of it, if you operate like a small, serious firm from day one.

Quick answers to common, practical questions UK first‑time consulting founders ask in 2026.