Equity
Equity is what remains when you subtract what you owe from what you own --- the residual claim, the true measure of where you stand.
What is it?
Equity is the simplest concept in finance and the most important. It is the gap between your assets and your liabilities. If you own CHF 400,000 in assets and owe CHF 250,000, your equity is CHF 150,000. That number --- not your income, not your possessions, not your lifestyle --- is your actual financial position.1
The accounting equation makes this structural:
Equity = Assets − Liabilities
This is not a formula someone invented. It is a logical identity. If everything you control (assets) is funded by either other people’s money (liabilities) or your own contribution (equity), then your share is whatever is left after all creditors are paid. Equity is the residual claim --- what remains when every obligation is settled.
In personal finance, equity is called net worth. In a corporation, it is called shareholders’ equity or book value. In a startup, the founders’ equity is their ownership stake --- the share of the company’s value that belongs to them after debts are cleared. The context changes; the structure does not.
In plain terms
Equity is the honest answer to “what am I actually worth?” It is not what you earn, not what you own, and not what you spend. It is what you own minus what you owe. Many people with high incomes have low or negative equity. Many people with modest incomes have built substantial equity over time.
At a glance
The accounting equation (click to expand)
graph LR A["Assets<br/>what you control"] --> EQ["Equity<br/>what is truly yours"] L["Liabilities<br/>what you owe"] --> EQ A ---|minus| L style A fill:#27ae60,color:#fff style L fill:#e74c3c,color:#fff style EQ fill:#4a9ede,color:#fffKey: Equity is not a third thing alongside assets and liabilities. It is the difference between them. It rises when assets grow faster than liabilities and falls when the reverse is true.
How does it work?
1. Personal equity: net worth
Your personal net worth is calculated by listing everything you own (assets), listing everything you owe (liabilities), and subtracting.
| Assets | Value | Liabilities | Value |
|---|---|---|---|
| Bank accounts | 15,000 | Credit card debt | 3,000 |
| 3a pension | 22,000 | Student loan | 12,000 |
| Investments | 8,000 | ||
| Car (market value) | 6,000 | ||
| Total assets | 51,000 | Total liabilities | 15,000 |
Net worth = CHF 51,000 − CHF 15,000 = CHF 36,000
This number is more revealing than income. Someone earning CHF 150,000 per year but spending CHF 148,000 and carrying CHF 50,000 in consumer debt has a lower net worth than someone earning CHF 60,000 who saves 30% and has no debt. The first person looks wealthy. The second person is wealthy.
Think of it like...
Income is velocity. Net worth is position. A fast car going in circles stays in the same place. A slow car heading consistently in one direction gets somewhere.
2. Business equity: the owner’s stake
In a business, equity represents the owners’ residual interest. If a company has CHF 1 million in assets and CHF 600,000 in liabilities, the owners’ equity is CHF 400,000. This means that if the company were liquidated --- all assets sold and all debts paid --- CHF 400,000 would remain for the owners.
Business equity grows through two mechanisms: retained earnings (profit that is reinvested rather than distributed) and contributed capital (money the owners put in). It shrinks through losses (expenses exceeding revenue) and distributions (dividends or owner withdrawals).
This is why profitability matters beyond the income statement. Every franc of profit, if retained, increases equity. Over years and decades, retained earnings compound into the equity base that makes a business resilient, fundable, and valuable.
3. Negative equity
When liabilities exceed assets, equity is negative. This means you owe more than you own. In personal finance, this is insolvency --- not necessarily bankruptcy (a legal process) but a mathematical reality: if you sold everything and paid everyone, you would still owe money.
Negative equity is more common than it appears. A recent graduate with CHF 40,000 in student debt and CHF 5,000 in the bank has negative equity of CHF −35,000. A homeowner whose property value drops below the mortgage balance is “underwater” --- negative equity in that specific asset.
Negative equity is not permanent and not always catastrophic. The graduate’s human capital (future earning power) is a real asset not captured on any balance sheet. The underwater homeowner may recover as property values rise. But negative equity is a signal of fragility: there is no buffer between you and financial distress.
4. Equity as ownership
In the corporate world, equity has a second meaning: ownership stake. If you hold 20% equity in a company, you own 20% of the residual claim. When the company is sold, you receive 20% of whatever remains after all debts are paid.
This is why startup founders care intensely about equity dilution. Every time a company raises money by issuing new shares, the existing owners’ percentage decreases. The total equity may grow (the pie gets bigger) but each founder’s slice gets thinner. The negotiation between founders and investors is fundamentally a negotiation about who holds what fraction of the residual claim.
Why do we use it?
Key reasons
1. True position. Equity tells you where you actually stand, stripping away the illusions created by income, possessions, and lifestyle. It is the only number that accounts for both what you have and what you owe. 2. Wealth building. Every financial decision either increases or decreases equity. Framing decisions this way --- “does this build my equity?” --- provides a consistent compass. 3. Resilience. Positive equity is a buffer. The larger the buffer, the more shocks you can absorb (job loss, market downturn, unexpected expense) without insolvency.
When do we use it?
- Personal finance: tracking net worth over time as the primary measure of financial progress
- Business analysis: assessing whether a company has a healthy equity base relative to its liabilities
- Startup negotiations: understanding dilution, vesting, and the value of ownership stakes
- Real estate: calculating home equity (property value minus mortgage balance)
- Lending: banks use equity ratios to determine creditworthiness
Rule of thumb
Track your net worth quarterly, not your expenses daily. The trajectory of equity over time tells you more about your financial health than any monthly budget.
How can I think about it?
Analogy: the waterline
Think of a ship. Assets are the hull above and below the water. Liabilities are the water level. Equity is how much hull sits above the surface. When equity is high, the ship can take waves without sinking. When equity is thin, even a small wave puts water on the deck. When equity goes negative, the ship is underwater.
Concepts to explore next
| Concept | Status | What it adds |
|---|---|---|
| asset | complete | What you own --- the left side of the equation |
| liability | complete | What you owe --- the claims against your assets |
| financial-statements | complete | The balance sheet where equity is formally reported |
| capital-structure | stub | How businesses choose between debt and equity funding |
Check your understanding
Five questions (click to expand)
- Calculate your approximate personal net worth right now. List three assets and any liabilities. What does the number tell you that your income does not?
- Explain why someone earning CHF 150,000/year can have a lower net worth than someone earning CHF 60,000/year. What variable accounts for the difference?
- Distinguish between equity as “residual claim” and equity as “ownership stake.” How are the two meanings related?
- Describe what negative equity means and give two scenarios --- one where it is a temporary state and one where it signals genuine financial distress.
- Connect equity to the concept of financial-independence. What equity level (net worth) would make your time fully your own?
Where this concept fits
Where this concept fits
graph TD A[Asset] --> EQ[Equity] LI[Liability] --> EQ EQ --> FS[Financial Statements] EQ --> CS[Capital Structure] EQ --> FI[Financial Independence] style EQ fill:#4a9ede,color:#fff
- Prerequisites: asset (what you own), liability (what you owe)
- Leads to: financial-statements, capital-structure, financial-independence
Sources
Footnotes
-
International Accounting Standards Board (IASB). (2018). Conceptual Framework for Financial Reporting. Chapter 4, para. 4.63—4.64. “Equity is the residual interest in the assets of the entity after deducting all its liabilities.” ↩