Capital
Learn what capital means in business, the main types of capital, and where small businesses get it.
Published Monday 17 August 2026
Table of contents
Key takeaways
- Capital is the money and financial resources you use to start, run, and grow your business, and it can also mean the net worth of the business
- The main types are equity capital, debt capital, working capital, and fixed capital
- Capital comes from internal sources, such as retained profits and owner funds, and external sources, such as bank loans and investors
- Keeping enough working capital lets you pay your bills on time and set money aside to invest in growth
What is capital in business?
Capital is the money and financial resources a business uses to build, run, and grow. It can also refer to the net worth, or book value, of a business.
Most often, capital means the money a business uses to meet upcoming expenses or to invest in new assets and projects. Think of it as the fuel that keeps the day-to-day running and pays for the next stage of growth.
Why capital matters
You have to put money into a business before you can take a profit back out, and capital is the money that goes in. Without it, even a promising idea struggles to get off the ground.
A business needs enough capital to meet all its upcoming expenses, which is known as working capital. If it runs short, it can default on bill payments and may have to stop trading. Most owners like to hold more than enough working capital, so the surplus can be reinvested in improvements that help the business grow. Your capital and net worth also show up in your financial statements, which lenders and investors use to judge your financial health.
Types of capital
Capital is not a single thing. Businesses usually talk about a few distinct types, depending on where the money comes from and what it does.
- 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 an overdraft
- Working capital: the money available to cover day-to-day costs, worked out as current assets minus current liabilities, as explained in this guide to working capital
- Fixed capital: the long-term assets you buy to operate, such as premises, machinery, and equipment
Sources of capital
Capital comes from two broad places: inside the business and outside it. Knowing which to use, and when, helps you fund growth without taking on more risk than you need.
- Internal funding: profits you reinvest, owner savings, and cash from selling assets. Funding a business mainly from its own resources is often called bootstrapping
- External funding: money from outside the business, such as bank loans, non-bank lenders, investors who take equity, or grants. Our guide covers the main ways to finance your business
Many Irish businesses lean on internal funds first. In the Department of Finance SME Credit Demand Survey for 2025, 82% of SMEs that did not apply for credit said they had sufficient internal funds and did not need external finance.
Manage your business capital with Xero
Knowing your capital position helps you decide when to spend, save, or raise money. Xero accounting software gives you a real-time view of your assets, liabilities, and cash, so you can see where your business stands and plan your next move with confidence. You can get one month free and see how Xero simplifies your day-to-day finances.
FAQs on capital
Here are answers to some common questions about capital and how it works for small businesses.
What is capital in simple words?
Capital is the money and assets a business uses to operate and grow. It is what you put into the business to keep it running and to fund its next steps.
What are the main types of capital?
The main types are equity capital, debt capital, working capital, and fixed capital. Each describes a different way money is raised or used in the business.
What is the difference between capital and money?
Money is what you spend day to day, while capital is money and assets put to work to generate more value over time. All capital involves money, but not all money is treated as capital.
Does every business need capital?
Yes. Every business needs some capital to cover its early costs and keep trading, even if that capital is only the owner's own savings.
What is the difference between capital and working capital?
Capital is the wider pool of money and assets in a business, while working capital is the short-term money available to cover day-to-day expenses. Working capital is one specific part of a business's overall capital.
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Disclaimer
This glossary is for small business owners. The definitions are written with their requirements in mind. More detailed definitions can be found in accounting textbooks or from an accounting professional. Xero does not provide accounting, tax, business or legal advice.