How to calculate your real net worth (and why almost everyone gets it wrong)

Net worth = assets − liabilities. Assets are anything you can turn into money: accounts, investments, pensions, property, vehicles, company stakes and loans owed to you. Liabilities are everything you owe: mortgage, personal loans, cards, purchase financing, pending taxes and guarantees you might have to honour.

The difference between a useful calculation and a decorative one is the valuation rules. There is no 'true' net worth figure: there is a consistent one. If you always apply the same criteria, the month-to-month comparison will tell you the truth even if the absolute level has a 10% margin of error.

A property is not worth what your neighbour asks: it is worth what someone pays today, minus agency fees, transfer taxes and the months it takes to sell. Apply a liquidity discount of 5-10% for housing in liquid areas and 15% where demand is thin.

For hard-to-sell assets — collector cars, watches, art, stakes in private companies — a reasonable discount is 20-30%. And if an asset has no market and no identifiable buyer, the honest answer is to count it at zero until it sells.

The debt that destroys the most wealth is not the mortgage but revolving debt: cards, instalment purchases and credit lines renewing monthly at 20-40% a year. There compounding works against you at a speed no reasonable investment can offset.

Liabilities that show on no statement also count: deferred taxes on unrealised gains, a pending building levy, your annual self-employment settlement or a guarantee signed for a relative. You do not need cent-level precision; you need to stop pretending they do not exist.

Two people with €400,000 net worth can live opposite realities. If 95% sits in the primary home there is no room to manoeuvre: any surprise gets paid with debt. If 60% is liquid, there is freedom to change job, city or life.

That is why you should log two figures each month: total net worth and investable net worth (cash plus investments sellable within a week). The second is what really drives your financial independence.

Growing 4% with 5% inflation is getting poorer with a smile. Track your net worth in the same currency every month and compare it against the inflation of the country where you spend, not where you invest.

If you live between two countries, pick a base currency and convert everything at the cut-off day's exchange rate. Switching base currency mid-year destroys the historical series and makes the trend unreadable.

The most common mistake is counting future income as assets: the bonus not yet paid, unvested stock options or an expected inheritance. None of that is net worth until it is in your account and unconditionally yours.

The second is silently changing method: one month you value the house with a listings portal, the next with the bank appraisal. Write your rules once and keep them for at least twelve months.

A net worth that changes no behaviour is museum data. Use it to answer three questions each quarter: how much came from saving versus the market, what share is liquid, and how far am I from my financial freedom number?

Separating savings-driven growth from market-driven growth is especially revealing: the first proves discipline, the second only proves exposure. In good years everyone looks brilliant; the savings rate is what holds up in bad ones.

When Laura, a 38-year-old architect, ran the exercise for the first time she believed she had €320,000. After subtracting the outstanding mortgage, the flat's selling costs and the car loan, the real figure was €187,000, and only €46,000 of it was liquid.

The impact was not emotional, it was operational: in fourteen months she raised liquidity to €71,000, cleared the car loan, and her real net worth grew 19% without earning a single euro more. Measuring properly does not make you richer, but it shows where you were fooling yourself.

Gross net worth adds up everything you own without subtracting anything: home, car, savings, business. Net worth subtracts debts from gross net worth. But the number that actually predicts your financial freedom is investable net worth: the portion of net worth that generates income or can be converted into income without wrecking your lifestyle. Your primary residence, car or furniture count toward net worth, but not toward investable net worth, because selling them leaves you without a home or transport.

Calculate all three every quarter and compare them on the same sheet: gross net worth, net worth and investable net worth. If your net worth grows but the investable figure stalls, you are probably pouring money into your home or durable consumer goods rather than into assets that work for you. It is a silent warning sign that the single net worth figure never shows, and it only appears once you break the calculation into these three layers.

Listed assets value themselves: your broker gives you a real-time price. The problem shows up with assets that lack a daily market. For a company you own, use a conservative multiple on annual net profit, between three and five times for a small business with no special assets, and apply a 20-30% liquidity discount to that figure because selling it takes months and rarely fetches the theoretical price. Do not treat a startup's last funding-round valuation as if it were cash: it is one investor's opinion, not a market price.

Cryptocurrencies are valued at the day's market price, but it is wise to apply a mental 20% discount if they represent more than 10% of your net worth, given their volatility. Stock options in your employer only count if vested; value them at intrinsic value (market price minus strike price) multiplied by 0.7 to reflect the tax due on exercise. Illiquid stakes in private equity funds are recorded at the last reported net asset value, never at the manager's optimistic projection, and flagged separately as 'unavailable for X years'.

Pension plans and similar vehicles are recorded at current surrender value, not the nominal amount contributed, and always net of the tax you will pay on withdrawal, which in Spain can run 30-45% marginal depending on your bracket. Treat them as an asset with two labels: the gross value shown on the statement and the net value available after tax, which is the one you should use in any real financial-freedom calculation.

Not all debt subtracts equally from your financial freedom. Good debt finances an asset that appreciates or generates income at an interest rate lower than its expected return: a low fixed-rate mortgage on a home that also saves you rent, or a loan to buy a business that generates more cash than its instalment. Bad debt finances consumption that depreciates or disappears: revolving credit cards, high-rate car loans, holiday financing. For net worth both subtract the same number of euros, but for your financial-freedom plan you must separate them.

Create two liability lines on your spreadsheet: productive debt and consumer debt. The practical rule is simple: any debt with an interest rate above 7-8% annually should be treated as an emergency to pay off before investing another euro, because few portfolios consistently beat that return. Productive debt below 4% can be kept while the capital you are not using to pay it down is invested at a higher expected return, as long as you hold enough liquidity cushion so you never depend on refinancing it at a bad market moment.

If you hold euro savings, a dollar account, a property in another country or dollar-denominated crypto, you need to fix a base currency and a single exchange rate for the whole calculation, updated on the same day for every line. Mixing exchange rates from different dates distorts the final figure and can make you think you gained or lost net worth purely from currency movement, not from the actual performance of the assets.

Always separate the currency effect from the performance effect in your tracking: note how much each asset moved in its local currency and how much the exchange rate moved, and show both separately on your sheet. This avoids bad decisions, like selling a dollar portfolio that actually rose 8% in local currency just because the euro strengthened and the euro figure looks flat or negative. For property abroad, always use a recent local appraisal and convert it at the exchange rate on the valuation date.

Updating your net worth every day is noise: daily market volatility gives you no useful information and only generates anxiety. Update the liquid items (accounts, brokers, crypto) monthly, and the illiquid ones (home, business, stakes) every six to twelve months, using real appraisals or market comparables, not optimistic estimates. Fix a set day each month, for example the last Sunday, so comparisons between periods are consistent and do not depend on when you happen to look.

Beyond the absolute number, three derived metrics tell you whether you are on track. First, the net-worth-to-annual-income ratio by age: as a rough benchmark, having one year's salary saved by 30, three times by 40 and six times by 50 marks a solid path toward financial independence, though it should be adjusted to your actual spending level. Second, the savings rate on net income, which predicts accumulation speed far better than portfolio returns for most wealth still being built. Third, years of freedom bought: investable net worth divided by your annual spending, which tells you how many years you could live without working if your income stopped today.

Calculating net worth once is useless if it never turns into recurring decisions. Set an investable net worth target tied to your annual spending (for example, 25 times spending for a 4% withdrawal rule) and, at each update, calculate the remaining gap and the pace at which you are closing it given your monthly savings and expected return. If the gap fails to shrink over two consecutive updates, the problem is almost always the savings rate, not the portfolio return, and that is where you should act first.

Use your net worth history to catch leaks before they become habits: if investable net worth grows slower than your income for three consecutive quarters, there is a new expense or debt eating into your margin. Also review the composition, not just the total: a correct net worth that is concentrated in a single illiquid asset (your own company, a property) is more fragile than it looks, so it is worth setting a maximum concentration limit, for example 60% of total net worth in a single non-diversifiable asset, to force diversification over time.