Startup Cost Estimator
Calculate UK business setup costs and capital needed.
What this calculator does
This startup cost estimator totals what it takes to open a business and keep it running until revenue arrives. Enter equipment, legal and licensing, stock, marketing, and premises setup costs, plus a monthly overhead figure and the months of working capital you want, and it returns the total capital required, split between one-off costs and working capital.
Working capital is the component that changes the answer. One-off costs are comparatively easy to pin down because you can obtain quotes. The money needed to trade for six months before income covers costs is harder to confront, and it is nearly always the bigger of the two figures.
When to use it
The obvious moment is before launch, when you need to know how much to raise, borrow, or set aside. A figure built this way is defensible to a bank or an investor in a way that a round number never is.
It is equally useful for deciding when to start rather than whether to. Comparing three months of working capital against twelve shows exactly what patience buys, and the honest conclusion is often to keep the salaried job for another two quarters. Established businesses can use the same structure to cost a second site or a new product line, where the setup and ramp-up problem is identical at smaller scale.
Understanding the inputs
Equipment cost should be delivered and installed, excluding VAT if you will be registered and able to reclaim it. Legal and licensing covers Companies House incorporation, any trade licence or permit, and solicitor time for a shareholders' agreement and standard terms.
Stock is your opening inventory, routinely underestimated by anyone who has not run a shop before. Marketing should cover pre-launch and the first few months rather than a website alone. Monthly overhead is every recurring cost — rent, business rates, wages including employer National Insurance and pension contributions, insurance, software, utilities. Working capital months is the runway: three is thin, six a sensible minimum, twelve prudent for a long sales cycle.
How is this calculated?
Total Startup Cost = Equipment + Legal + Inventory + Marketing + Office + (Monthly Overhead × Working Capital Months).
A worked example
A small services business budgets £15,000 for equipment, £2,000 for legal and licensing, £12,000 for opening stock, £6,000 for marketing, and £9,000 for premises setup — £44,000 of one-off costs. Monthly overhead runs £9,500, so six months of working capital adds £57,000, giving a total requirement of £101,000.
Trimming working capital to three months brings that down to £72,500, which is a far easier sum to raise. It also commits the business to reaching breakeven within ninety days of opening. Adding a 20 percent contingency to the six-month version gives roughly £121,000, which is closer to what this business will genuinely need.
Limitations and assumptions
The estimator totals only the categories you enter, so the output is only as good as the completeness of your list. Insurance, business rates, card processing, accountancy fees, and the founders' own living costs are the usual omissions, and collectively they are substantial.
It assumes no revenue during the working capital period, which is conservative for some businesses and entirely realistic for many. It also excludes VAT timing, corporation tax, loan interest, and the strong possibility that launch slips by a quarter. Treat the result as a floor, add contingency, and have an accountant review the assumptions before using the figure in a finance application.
Common Questions
- How much working capital does a new business need?
- Three to six months of operating costs is the usual guideline where revenue is expected quickly. Businesses with long sales cycles or a product still in development typically need twelve to eighteen months of runway. Underestimating this line is the most common reason viable businesses fail in their first year.
- What does it cost to set up a limited company?
- Incorporation through Companies House costs £50 online, which is trivially small. The real costs are elsewhere: accountancy fees for statutory accounts and corporation tax returns typically £1,000 to £2,500 a year, plus solicitor time for a shareholders' agreement and standard contracts, commonly £1,500 to £4,000.
- Should I register for VAT from the start?
- You must register once taxable turnover exceeds the threshold, currently £90,000 on a rolling twelve months. Voluntary registration below that lets you reclaim input VAT on setup costs, which can be worth thousands where equipment or fit-out is significant. It is less attractive if you sell mainly to consumers.
- What do founders most often leave out of the budget?
- Working capital itself, then business rates, insurance, professional fees, card processing, software subscriptions, and their own living costs. One-off setup items are visible and easy to list. The recurring cost of simply existing for six months before revenue arrives is what quietly breaks most budgets.
- How much contingency should I add?
- Fifteen to twenty-five percent on top of the total, and more where the plan involves building works, custom equipment, or licensing approval. This is realism rather than pessimism — planning permission takes longer than promised, contractors overrun, and the cost nobody anticipated always materialises eventually.
- Is there any tax relief on startup costs?
- Pre-trading expenditure incurred in the seven years before trading begins can generally be treated as a day-one expense. Equipment usually qualifies for the Annual Investment Allowance. If you are developing something technically novel, R&D tax relief may apply, though the rules have tightened considerably — take advice before assuming it.
- Should I lease or buy equipment when starting out?
- At launch, leasing usually wins on cash grounds even where it loses on total cost, because preserving working capital matters more than optimising the purchase. Revisit the decision once revenue is predictable. Spending scarce startup cash on an asset you could have financed is a frequent and avoidable mistake.
- How accurate are startup budgets in practice?
- Reliably optimistic. Actual costs commonly land 20 to 50 percent above the first estimate, driven more by timeline slippage than by any single item. Every additional month before trading adds a full month of overhead, which is why launch delays damage the budget far more than founders anticipate.
- Can I claim SEIS or EIS investment?
- SEIS allows a qualifying early-stage company to raise up to £250,000 with generous income tax relief for investors, and EIS covers larger amounts thereafter. Both have strict conditions on trade, age, and use of funds. Seek advance assurance from HMRC before approaching investors rather than after.