Net worth tracking, and why the direction matters more than the number

The calculation

Add up everything you own that has value. Subtract everything you owe. The result is your net worth, and it can perfectly reasonably be negative.

On the assets side: cash and current accounts, savings, investments, retirement accounts, property at a realistic market value, vehicles at a realistic resale value, and money genuinely owed to you.

On the liabilities side: mortgage balance, loan balances, credit card balances, and anything else you owe.

A negative net worth is entirely normal early in a career, particularly with student debt or a recent mortgage. It is a snapshot of position, not a judgement.

Where the calculation goes wrong

Most net worth figures are wrong in the same predictable directions, and almost all of them are optimistic.

• Optimistic property valuation. Using an aspirational figure rather than a realistic sale price, and ignoring the substantial costs of actually selling.
• Vehicles at purchase price or wishful value rather than what someone would actually pay today.
• Possessions counted as assets. Furniture, electronics, and clothing have almost no resale value and inflate the figure without adding anything real.
• Forgotten liabilities. Buy-now-pay-later arrangements, tax owed but not yet paid, and informal loans from family.
• Receivables counted at full value when some of them are not coming back.
• Retirement accounts counted at full balance without regard to the tax that will apply on withdrawal.

The general fix is conservatism on assets and completeness on liabilities. A figure you have flattered is worse than no figure, because you will make decisions with it.

Why the trend matters more

The absolute number is largely a function of things you did not choose: when you were born, what you inherited, what housing costs where you live, what you earn in your field.

The change over time is much more closely connected to your actual decisions. Someone whose net worth rose modestly from a negative position may be doing considerably better than someone with a large positive figure that is drifting downward.

This matters because comparison against other people's net worth is close to meaningless, while comparison against your own six months ago is genuinely informative.

Track your own direction. It is the only version of this number that reflects something you control.

How often to calculate it

Quarterly is about right for most people. Monthly is usually too frequent to be informative and frequent enough to be stressful.

The reason is that the largest components — property values and investments — move for reasons entirely unrelated to your behaviour. Watching them monthly means watching market noise and mistaking it for your own performance.

Quarterly is slow enough that a real trend becomes visible and your own contributions register against the noise. Annually is also perfectly reasonable if quarterly feels like too much.

What is worth doing more often is checking the components you actually control — cash balances, debt balances, contributions made — since those respond directly to decisions.

What a ledger contributes

A transaction ledger is not a net worth tracker, and it is worth being clear about which parts it genuinely helps with.

It handles the parts driven by transactions well. In expenie, account balances come from opening balance plus every accepted transaction, so your cash and current account positions are accurate by construction. Loans hold their remaining principal, updated as you record payments. Receivables track what you are owed with a remaining balance.

That covers most of the liabilities side and the liquid part of the assets side — which for many people is the majority of the calculation.

What it does not do is track market values. Investment balances and property values change without any transaction occurring, and a ledger records transactions. Those figures come from elsewhere and get added manually when you compute the total.

Depreciation is the same case. A car losing value is not a transaction, so it does not belong in a ledger — it belongs in the valuation you use when calculating.

What net worth does not tell you

It is a single number, and single numbers hide things. Three limitations worth holding in mind:

It says nothing about liquidity. Someone with substantial net worth entirely in property and retirement accounts may be unable to handle a surprise cost. Net worth and financial resilience are different properties, which is why the emergency fund is a separate question.

It says nothing about cash flow. A high net worth with expenses exceeding income is a declining position, and the net worth figure will reflect that only slowly.

It says nothing about risk. Two identical net worth figures, one concentrated in a single asset and one diversified, are not the same situation.

This is why net worth is best used alongside other measures rather than as the headline. Committed share of income, buffer months, and monthly net are all more actionable for day-to-day decisions.