Ask someone how they are doing financially and they will almost always tell you their income. Ask what their net worth is, and most people either do not know or have never thought to calculate it.
This is backwards. Income is what flows through your hands. Net worth is what stays.
What income tells you
Your income is your earning capacity — the hourly or annual rate at which your labour or capital produces money. It is a useful measure of current productivity and negotiating leverage.
What income does not tell you:
- Whether you are building wealth
- Whether you could survive a job loss
- Whether you are on track for any goal
- What your financial life actually looks like
Two people with identical salaries of €60,000 per year can have wildly different financial realities. One carries €80,000 in student debt and a fully drawn credit card. The other has a paid-off flat and an investment portfolio. Their income is the same. Their net worth is not.
What net worth tells you
Net worth is the honest number. It is the sum of everything you own minus everything you owe — your bank balances, investments, property equity, and other assets, minus every loan, mortgage, and debt.
Unlike income, net worth:
Reflects what you have actually built. A high income with nothing saved is a high throughput, zero accumulation. Net worth captures accumulation.
Measures real financial resilience. If your income stopped tomorrow, your net worth is what you would live on. A negative or low net worth means you are one bad month from crisis, regardless of salary.
Is the relevant number for most long-term goals. Retirement, buying a home, financial independence — all of these goals are defined by a net worth threshold, not an income level.
The income trap
High earners are particularly susceptible to what economists call lifestyle inflation. Income grows, spending grows to match, and net worth stays flat or grows slowly. This is common enough to have a name: high income, low wealth.
It happens because income is visible and celebrated. Salary increases feel like progress. A bonus feels like security. But unless income excess converts into assets — savings, investments, equity — it does not move the net worth line.
Tracking net worth monthly makes this visible in a way that income tracking cannot. You see directly whether this month's income produced any accumulation.
How net worth grows
Net worth grows through four mechanisms:
- Saving a portion of income — the most direct lever
- Investment returns — compounding on existing assets
- Debt repayment — each mortgage or loan payment increases net worth by reducing liabilities
- Asset appreciation — property, equity, or other assets increasing in value
The interesting insight is that mechanisms 2, 3, and 4 compound over time without requiring additional income. A person who built €100,000 in invested assets twenty years ago — even with a modest salary — will have a dramatically higher net worth today than someone who earned more but saved less.
The right cadence for each metric
Income is a monthly or annual measurement. It tells you about flow.
Net worth is a monthly snapshot for tracking purposes, and a multi-year trend for evaluating progress. Looking at a single month's net worth in isolation tells you less than watching it grow over 12 or 24 months.
This is why monthly net worth tracking is more valuable than sporadic checks. The pattern — consistent growth, a plateau, a dip during market corrections, a recovery — is where the insight lives.
A practical starting point
If you have never calculated your net worth before, start with a rough estimate:
- Add up your bank balances
- Add the current value of your investments and any property equity
- Subtract every debt balance (mortgage, loans, credit cards you carry)
That number, however imperfect, is more useful than not knowing it. Then track it monthly. After six months you will have a baseline. After twelve, a trend. After three years, a story.
The income you earn tells you what you are worth to your employer right now. The net worth you build tells you what you have done with it.
Fizzy makes monthly net worth tracking a three-minute task. Add your accounts once, enter balances each month, and watch the trend line grow. Start for free — no credit card →