Startup capital: how much money you need until your business pays you

Most founders who ask how much startup capital they need are thinking of the van, the shop fit-out or the laptop. Those are real costs, but they are rarely the reason a new business runs out of money. The hole usually appears months later: customers come in more slowly than planned, the owner still has rent to pay, and the first tax bill arrives just when the account is low.

Startup capital is therefore four things added together: what you invest, the losses before revenue covers the costs, your own living costs until the business can pay you, and a buffer for setbacks and tax. There is no reliable average amount, because a freelance copywriter and a restaurant need completely different sums. What you can do is calculate your own number. The example below is in euros; the method works in any currency.

The four building blocks of startup capital

How to calculate startup capital in five steps

1. 01

   Add up the investments

   Take the total from your investment budget, including VAT you must pre-finance. Leasing or buying second-hand lowers this block.

2. 02

   Set your private need per month

   Housing, household, insurance and the pension saving your employer used to arrange. Subtract other household income, such as a partner's salary.

3. 03

   Calculate the monthly sales you need

   Divide fixed costs plus private need by the margin per product, hour or job. That is the volume at which the business pays its way and pays you.

4. 04

   Run your drawings through a monthly cash forecast

   Put expected sales, costs and your drawings in a cash flow forecast month by month. The deepest cumulative point is your start-up loss plus your private shortfall.

5. 05

   Test a setback and add the buffer

   Run the forecast again with fewer customers or a later start. The extra depth, plus the tax on your first profit and a contingency, is your buffer. Investments, losses, shortfall and buffer together make your startup capital.

How big should your buffer be?

Many established small firms run with thin reserves. In a study of 597,000 small businesses with Chase business deposit accounts, the median business held enough cash to cover 27 days of outflows, and a quarter held fewer than 13 days (source: JPMorgan Chase Institute, September 2016). Restaurants had the thinnest cushion, with a median of 16 days (source: JPMorgan Chase Institute, September 2016). Those figures describe existing US businesses in one bank's customer base, not a target for you. For a start-up with uncertain revenue, a deliberate calculation works better than any rule of thumb:

• Setback: how much deeper does the hole get with a quarter fewer customers, or with revenue starting three months later?
• Tax: how much tax will you owe on your first year's profit, and when must you pay it?
• Household: the less other income your household has, the larger the buffer you need.

Worked example: a home-based dog grooming business

Ines converts her garage into a grooming room and starts as a sole trader. Her investments come to €16,500: €7,500 for the conversion, €6,000 for a grooming table, bath, dryer and clippers, €1,200 for a laptop, booking software and card reader, €400 of opening stock and €1,400 for signage, a website and flyers.

She charges €65 per groom excluding VAT, of which €7 goes on shampoo and other materials, leaving a margin of €58. Her fixed costs are €650 a month and her private need is €2,500 a month, including income protection and pension saving. She needs (€650 + €2,500) / €58 = 54.3, so 55 grooms a month, to pay her way. With four grooms a day, five days a week, her capacity is about 87 a month. She expects to reach 80 a month by the end of the first year.

Fictitious Firmfocus example. Result after fixed costs = grooms x €58 - €650. Amounts exclude VAT.

The deepest point is €8,460 in month 6: a start-up loss of €70 in the first month plus a private shortfall of €8,390. The business itself covers its costs from month 2. It is Ines's own rent and groceries that need financing.

Buffer and a variant with a part-time job

If a quarter fewer dogs come in each month, the hole deepens to €12,302 in month 10, which is €3,842 deeper. Ines adds an assumed €3,000 for the tax on her first year's profit, which she will pay after the year ends, and €1,000 for repairs to equipment. That comes to €7,842, rounded up to a buffer of €8,000, close to three months of her private spending.

In a variant she keeps two days a week at a veterinary clinic for the first six months, earning €1,100 net a month. On three grooming days her capacity is about 52 dogs a month, enough for the 10 to 50 she expects in that period. The deepest point then falls to €3,096 in month 4.

Fictitious Firmfocus example. The buffer stays the same in the variant because the job ends after six months.

Ines puts in €15,000 of savings. Full-time, she needs a loan of about €18,000; with the part-time job, about €12,600. Read starting alongside your job if the variant appeals to you.

Where the startup capital comes from

Most small businesses start with the owner's own money, sometimes topped up by family or friends. Savings you put in are a capital contribution, not revenue, so they do not count as profit. Lenders usually expect such a contribution before they lend, because it shows you share the risk. Bank loans, microloans, leasing and grants can cover the rest. The funding and grants guide lists the options, and the financing plan shows how to combine them.

Tax in the start-up phase

Tax on your first profit is easy to forget because it usually arrives after the year has closed. Several countries ask for payments in advance. In the United States, individuals generally pay estimated tax in quarterly instalments if they expect to owe $1,000 or more (source: IRS, September 2026). In the United Kingdom, Self Assessment payments on account are each half of the previous year's bill and fall due on 31 January and 31 July (source: GOV.UK, October 2024), so the first January can bring the balance for year one plus the first advance for year two. In Australia, PAYG instalments are regular prepayments of the expected tax on business and investment income (source: Australian Taxation Office, December 2024). Ask your accountant whether start-up losses can be carried forward or set against other income, and see tax and bookkeeping.

Small start vs larger start

Pitfalls

• Counting only the equipment: in the example, investments are only half of the startup capital.
• Using your employee budget: pension, sick pay and some insurance are now yours to arrange and pay.
• Forgetting the tax bill: drawing everything in year one leaves nothing for the assessment that follows.

Your startup capital ties together your rate, your prices and what you pay yourself, all part of money, pricing and income within Start a business.