Ask the internet how much it costs to start a UK business and you will get answers ranging from nothing to more than twenty thousand pounds, often on the same page. One widely cited study put the average at £22,756. Another put it at around £5,000. Both are real numbers and both are close to useless, because they average across a freelance copywriter with a laptop and a manufacturer buying machinery, and your business is one specific thing rather than the mean of all businesses.
Here is the uncomfortable truth that most cost guides soft-pedal: the question founders ask, what does it cost to start, is the wrong question, and answering it precisely will still leave you underfunded. The cost of starting is small, usually a few hundred pounds. The cost of surviving until the business pays for itself is the number that actually matters, and it is the one almost nobody calculates until they are running short. Businesses rarely fail because incorporation was expensive. They fail because they ran out of money before the revenue arrived.
This piece breaks the real costs into the three categories that matter, gives you the current 2026 figures, and shows you how to work out the only number that counts: how much you actually need before you start.
The three categories that actually matter
Founders lump all startup costs together and then focus on the visible, one-off ones. The useful split is into three groups, because they behave completely differently.
Formation costs are the one-off legal cost of coming into existence. Small, fixed and predictable.
Launch costs are what you spend to be ready to trade: equipment, website, initial stock, branding. Variable, and the category founders obsess over.
Survival costs are what it costs to keep going, month after month, until revenue covers them. This is where businesses actually fail, and it is the category most new founders overlook entirely.
The mistake is not underestimating any single category. It is focusing on the first two, which are visible and finite, and ignoring the third, which is where the real funding requirement lives.
Formation: smaller than you think, but it just went up
Registering a limited company with Companies House is genuinely cheap, though less cheap than it was.
The digital incorporation fee rose to £100 on 1 February 2026, doubled from £50 [1]. Same-day digital incorporation costs £156, and paper incorporation is £124 [1]. If you register directly with Companies House, that fee is essentially your entire formation cost. Formation agents will handle it for you, bundling the fee with extras for anywhere from a few pounds to around £150 depending on what is included [2].
Two changes matter beyond the headline fee. Identity verification has been mandatory for new directors and people with significant control since 18 November 2025 [3]. It adds a step rather than a fee, but it is a step to plan for. And the annual confirmation statement, which every company must file, rose to £50 from 1 February 2026 [1], so budget for it as a recurring cost rather than a surprise.
A sole trader has no formation cost at all, because there is nothing to register with Companies House. You register for Self Assessment with HMRC, which is free. Whether limited or sole trader is right for you is a separate decision covered in our business structure guide, but on formation cost alone the sole trader route is free and the limited company route is £100.
Either way, formation is the cheapest part of starting a business and the part founders worry about most. It is worth almost none of your attention beyond doing it correctly.
Launch: the category that varies enormously
This is where the divergent averages come from, because launch costs depend entirely on what your business needs to trade.
A freelance service business selling a skill you already have, using a computer you already own, can launch for close to nothing beyond a website and basic tools. A retail shop or a trade business needing premises, stock, vehicles and equipment can require tens of thousands. Neither figure is wrong; they are different businesses.
The common launch costs to budget for are a website, from a few hundred pounds for something simple to several thousand for a bespoke build; basic branding; any equipment or tools specific to your trade; initial stock if you sell products; and the first tranche of marketing to announce that you exist. Software subscriptions, which founders consistently underestimate because each one is small and they accumulate silently, belong here too.
The discipline is to separate what you genuinely need to start trading from what would be nice to have once you are. A great many launch costs can wait until revenue funds them. The website has to work; it does not have to be perfect. The equipment has to do the job; it does not have to be new. Founders who spend their launch budget on polish frequently find themselves short on the survival costs that actually keep them alive.
One useful point most guides miss: HMRC allows pre-trading expenditure incurred in the seven years before your business starts to be deducted in your first trading year, including professional fees, equipment, marketing and subscriptions [4]. Keep every receipt from before you start, because much of it is deductible once you do.
Survival: the number that actually determines whether you make it
This is the category that separates the businesses that survive from the ones that do not, and it is the one founders calculate last, if at all.
Survival costs are your monthly running costs: rent, wages including your own drawings, insurance, software, and the ongoing cost of delivering whatever you sell. The critical figure is not any single month but how many months you need to cover before the business generates enough revenue to pay for itself, because that gap is the real funding requirement.
The widely used rule of thumb is to hold three to six months of operating expenses as working capital [4][5]. Businesses with long payment terms, such as those invoicing other businesses on thirty or sixty day terms, should target the higher end or beyond, because the gap between doing the work and being paid for it is itself a funding requirement [5].
The formula that actually matters is simple and almost nobody applies it before starting:
Total you need = one-off costs + (monthly running costs × the number of months to reach sustainable revenue) + a contingency of 10 to 20 per cent [4].
The reason businesses fail here is not that the idea was wrong. It is that they funded the visible costs of starting and not the invisible cost of surviving the gap, and they ran out of money in month five of a business that would have been profitable in month nine.
Worked shape, not a false average
Rather than quote a single misleading average, it helps to see the shape for two very different businesses.
A lean solo service business might spend under a few hundred pounds to form and launch, then need to cover perhaps £1,500 a month of running costs and drawings for six months while it builds a client base. The formation and launch are trivial; the survival requirement is the real number, and it is several thousand pounds.
A small product or premises-based business faces launch costs in the thousands for stock, equipment or fit-out, plus higher monthly running costs, plus a longer gap to sustainable revenue. Its total requirement can run well into five figures, and the majority of that is survival funding rather than launch spend.
In both cases the pattern is the same: the cost of starting is dwarfed by the cost of surviving, and the businesses that plan only for the first number are the ones that struggle.
Where the money comes from
Once you know your real number, funding it is a separate question with several answers. Personal savings and bootstrapping remain the most common. A government-backed Start Up Loan offers £500 to £25,000 per director at a fixed 7.5 per cent from 6 April 2026, with each director able to apply separately [6]. Beyond that sit the wider funding routes covered in our UK funding landscape guide.
The point to hold onto is that you cannot sensibly seek funding until you know the survival number, because that number, not the launch cost, is what you are actually funding.
The mistakes founders make
Budgeting for the launch and not the survival. The single most common and most fatal error. The visible costs are finite; the survival gap is where businesses run dry.
Treating the average as their number. No business costs the average, because the average is a blend of businesses nothing like yours.
Spending the budget on polish. A perfect website and premium branding at launch, then no runway to reach revenue. Polish can wait; survival cannot.
Forgetting the recurring costs. The confirmation statement, insurance renewals, software that auto-renews. Small individually, and they accumulate into a monthly figure that surprises founders who only planned one-off costs.
Not keeping pre-trading receipts. Deductible expenditure from before you start, thrown away because nobody knew it counted.
Underestimating the time to revenue. Founders assume money arrives faster than it does. The gap is always longer than the plan, which is exactly why the contingency exists.
How to work out your real number this week
- List your one-off costs. Formation, equipment, website, initial stock, deposits. Be honest and complete.
- List your monthly running costs. Everything: rent, drawings, insurance, software, delivery costs. Include your own living requirement, because you cannot work for free indefinitely.
- Estimate the months to sustainable revenue, then add half again. Founders underestimate this consistently. Whatever you think, pad it.
- Apply the formula. One-off costs plus monthly costs times months, plus 10 to 20 per cent contingency. That total is your real funding requirement.
- Separate need-to-start from nice-to-have in your launch costs. Defer everything that revenue could fund later.
- Only then look at how to fund it. The number determines the funding route, not the other way round.
The principle underneath all of this
The cost of starting a UK business is not really a cost question. It is a survival question wearing a cost question’s clothes. Incorporation is cheap, launch is manageable, and neither is what determines whether you make it. What determines it is whether you funded the gap between opening your doors and the business paying for itself, and that gap is longer and more expensive than almost every founder expects.
Work out the survival number first. Everything else is detail.
Want to calculate your real startup number properly? The Startup Costs & Break-Even Toolkit gives you the calculators to work out your one-off costs, your monthly burn and the exact point your business pays for itself. For the complete founding toolkit from idea to launch, the Startup Operating System has everything you need. Or book a conversation. SGI has advised more than 2,000 businesses across 47 industries since 2014.
Get the Startup Costs & Break-Even Toolkit
Frequently Asked Questions
How much does it cost to register a company in the UK?
The Companies House digital incorporation fee is £100 as of 1 February 2026, doubled from the previous £50. Same-day digital registration is £156 and paper registration is £124. If you register directly, that fee is essentially your whole formation cost. A sole trader pays nothing, because there is no Companies House registration, only a free HMRC Self Assessment registration.
What is the average cost to start a UK business?
There is no useful average, because the figure blends businesses with nothing in common. Widely cited studies range from around £5,000 to over £22,000, which tells you only that the range is enormous. A lean service business can start for a few hundred pounds; a premises-based product business can need tens of thousands. Your number depends on your business, not the average.
What do most founders forget to budget for?
Survival costs, the monthly running expenses that continue until the business generates enough revenue to cover them. Founders budget for the one-off cost of starting and overlook the ongoing cost of surviving the gap before revenue arrives, which is where most cash crises actually originate.
How much working capital should I hold?
A common rule is three to six months of operating expenses, and businesses invoicing other businesses on extended payment terms should hold more, because the gap between doing the work and being paid is itself a funding requirement. Add a contingency of 10 to 20 per cent on top of your calculated total.
Can I claim costs incurred before I start trading?
Yes. HMRC allows pre-trading expenditure incurred in the seven years before your business starts to be deducted in your first trading year, including professional fees, equipment, marketing and subscriptions. Keep every receipt from before you begin, because much of it is deductible once you do.
Is it cheaper to be a sole trader than a limited company?
On formation cost alone, yes: a sole trader registers with HMRC for free, while a limited company now pays £100 to incorporate. But formation cost is a tiny part of the picture, and the choice between the two turns on tax, liability and credibility rather than the registration fee.
References
- Alto Accounting, Companies House fees 2026, May 2026. https://www.alto-accounting.com/insights/companies-house-fee-increase-2026
- 1st Formations, Cost to start a business UK, 2026. https://www.1stformations.co.uk/resources/cost-to-start-a-business-uk/
- Sleek, How much does it cost to register a company in the UK (2026), June 2026. https://ltd-companies.co.uk/resources/how-much-does-it-cost-to-register-a-company-in-the-uk-2/
- UK Calculator, Startup costs calculator UK 2026, March 2026. https://ukcalculator.com/startup-costs-calculator.html
- Xero UK, How much does it cost to start a business in the UK. https://www.xero.com/uk/guides/startup-business-costs/
- British Business Bank, Start Up Loans, 2026. https://www.british-business-bank.co.uk/start-your-journey/finance-finder/start-up-loan
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Kurt Graver is the founder and CEO of SGI Consultants, a business consultancy that has helped over 2,000 entrepreneurs establish successful startups using systematic business development methodologies. An accountant with an MBA and 25 years of commerce and consultancy experience, Kurt specialises in strategic planning, market analysis, and sustainable business growth