What is capital? A guide for small businesses

Published Thursday 23 July 2026

Table of contents

• What is capital?
• Why capital matters
• The types of capital
• Capital vs money and cash flow
• How capital works on the balance sheet
• Sources of capital for a business
• Manage your business capital with Xero
• FAQs on capital

Key takeaways

• Capital is the money and assets you use to build, run and grow your business, and it can also describe the net worth or book value of what you own.
• There are several types of capital, including equity, debt, working, fixed and trading capital, each with a different job in your business.
• Capital isn't the same as money or cash flow, so it helps to understand how each one moves through your accounts.
• You can raise capital from internal sources like retained profit or external ones like loans and investors.

What is capital?

Capital is the money and assets you use to build, run or grow a business. It can also refer to the net worth, or book value, of a business once you subtract what it owes from what it owns.

In everyday terms, capital is the fuel behind your operations. It covers the cash, equipment and other resources that let you trade, take on work and expand over time.

You'll often see the word paired with another one, such as working or fixed, to describe a specific role it plays. Getting to grips with these labels makes it easier to plan and to talk with your accountant.

Why capital matters

Capital gives you the means to cover day-to-day costs, invest in growth and weather quieter periods. Without enough of it, even a profitable business can run into trouble when bills fall due.

The everyday form of this is working capital, the money you have left once short-term debts are taken off your short-term assets. It's what keeps wages paid, stock on the shelves and suppliers happy.

Slow customer payments are one of the biggest drains on working capital. According to Xero Small Business Insights, UK small businesses waited an average of 29 days to be paid in the March quarter of 2026, and invoices were settled 8.2 days late, tying up money a business could otherwise use to cover its day-to-day costs.

The types of capital

Capital comes in a few different forms, and each one supports your business in a distinct way. Here are the main types you're likely to come across.

• Equity capital: money invested by the owners or shareholders in exchange for a stake in the business
• Debt capital: money you borrow and repay with interest, such as a bank loan or overdraft
• Working capital: the funds available for day-to-day running once short-term debts are covered
• Fixed capital: long-term assets like premises, machinery and vehicles that you keep and use over time
• Trading capital: the money a business sets aside to buy and sell goods or to fund market activity

Capital vs money and cash flow

Capital, money and cash flow are related but they aren't the same thing. Knowing the difference helps you read your accounts with more confidence.

Money is simply a medium of exchange, the pounds you use to pay for things. Capital is money and assets put to work in the business to generate more value, so it's money with a purpose.

Cash flow is the movement of money in and out of your business over a period. You can hold plenty of capital on paper and still face a cash flow squeeze if payments arrive late, which is why steady cash flow matters as much as the capital itself.

How capital works on the balance sheet

Your balance sheet shows capital as the value left for the owners once every debt is accounted for. It follows a simple rule known as the accounting equation.

The equation is assets minus liabilities equals capital. In other words, what you own minus what you owe leaves the capital, or net worth, of the business.

Say your business owns £80,000 in assets, made up of equipment, stock and cash. If it owes £30,000 in loans and unpaid bills, your capital is £50,000. That £50,000 is the book value of the business at that moment.

Sources of capital for a business

You can raise capital from inside the business or from outside it. The right mix depends on how much you need, how quickly and how much control you want to keep.

Internal sources come from the business itself, such as retained profit you reinvest or cash freed up by selling an asset. These don't add debt or dilute your ownership, though the amount is limited to what the business already generates.

External sources fall into two camps: debt and equity. With debt you borrow and repay with interest, while with equity you sell a share of the business to an investor. Both routes sit within the wider range of types of finance open to small businesses.

Equity raising can mean bringing in venture capital or angel investors who back your growth. On the debt side, options like invoice financing let you unlock cash from unpaid invoices without giving up any ownership.

Manage your business capital with Xero

Understanding your capital is the first step; keeping a clear, current view of it is what helps you act with confidence. When you can see your assets, debts and cash position in one place, decisions about spending, saving and growing become far easier.

Xero brings your finances together so you can track what you own, what you owe and how money moves through your business in real time. To see how it works for yourself, you can get one month free.

FAQs on capital

Here are some frequently asked questions about capital to clear up the points people ask about most.

What are examples of capital?

Examples include the cash in your business account, equipment, vehicles, premises and stock. Money invested by owners or borrowed through a loan also counts as capital.

What are the sources of capital?

Capital can come from internal sources such as retained profit, or external sources such as bank loans and investors. Debt raising means borrowing, while equity raising means selling a share of the business.

What is the difference between capital and money?

Money is a medium of exchange you use to pay for things. Capital is money and assets put to work in the business to create more value.

What is the difference between fixed and liquid capital?

Fixed capital is tied up in long-term assets like machinery and property that you use over time. Liquid capital is cash or assets you can turn into cash quickly to meet short-term needs.