Net worth tracking: what to measure and how often

In short

A friend of mine kept his money in his head for thirty years, and he was sure he was doing fine. Then one rainy Sunday he added it all up on paper and found a $9,000 gap between what he believed and what was true. Net worth is simply what you own minus what you owe. Write it down once, then write it down again on a schedule you can keep. Count assets at what they would sell for, and count every debt at what it would take to pay it off today. Check it once a quarter, or once a month if you like numbers. Do not check it daily, because daily wiggles will only wear you out.

The whole of it

What it is

I once watched a neighbor fret over a single bad day in the stock market, then forget to notice that his mortgage had dropped by $2,400 that same year. That is the trouble with looking at only one number. Net worth puts everything on one page so the whole picture shows up together.

Assets are the things you own that have value. That means cash in the bank, money in retirement accounts, the value of a home, and a car you could sell. Liabilities are the things you owe, such as a mortgage, a car loan, a student loan, and card balances. Net worth is assets minus liabilities. If the answer is below zero, that is not a verdict on you. Plenty of good people start there, especially after school or a hard stretch.

It is a snapshot, like a photograph of a field on one particular morning. It tells you where you stand today. It does not tell you how hard you worked or how well you meant to do.

How it works

You have probably told yourself you would get to this someday, and I understand that. The good news is that the method is plain. Pick a date, gather your latest statements, and list what you own and what you owe. Subtract the second list from the first. Save the result somewhere you will find it again.

The real power comes from doing it the same way each time. If you count your home at a generous price in March and a stingy price in June, your number will jump around for no reason at all. So choose your rules and stick with them. Use the balance shown on each statement. For a house, use a fair estimate of what it would sell for after the costs of selling. For a car, use what similar cars sell for today, not what you paid.

Two kinds of assets need a little thought. Cash and investment accounts have a clear balance. A retirement account has a balance too, but taxes may be due when the money comes out. Some people list the full balance. Others reduce it by a rough tax guess. Either choice is fine, as long as you pick one and keep it.

As for how often, a quarter is a good rhythm for most households. Four times a year is enough to see a trend and not so often that you lose heart over small swings. A monthly check suits someone who is paying down debt and wants to see each win. Daily is too much. Prices bounce around, and watching them bounce tells you very little.

The numbers, and where to find yours

Your own figures sit in documents you already have. Bank and brokerage balances live on your monthly statements. Loan balances are on your loan statements and online accounts. For the mortgage, use the principal balance, which is the part of the loan still unpaid, not the original amount.

For a home, a recent sale of a similar house nearby is a better guide than a hopeful guess. Many county assessor websites list assessed values, though these can differ from market prices. For a car, a used car pricing guide can give you a range.

For retirement accounts, the plan requires a statement at regular intervals, and the account website shows your balance anytime. Some people also like to compare their number against the Survey of Consumer Finances, which the Federal Reserve Board publishes. It shows how household wealth looks across age groups. Treat it as a look at the road, not a grade on your own walk. Your path is your own.

A worked example

A woman I will call Marta, age 38, sat down at her kitchen table on a quiet Saturday. She wrote down her assets first. Her checking and savings held $8,500. Her 401(k) held $41,000. Her car was worth about $11,000. Her home would sell for about $210,000.

That made her assets $8,500 plus $41,000 plus $11,000 plus $210,000, which comes to $270,500.

Next she wrote down what she owed. Her mortgage balance was $168,000. Her car loan was $6,200. Her student loan was $14,300. Her credit card was $1,500.

Her liabilities came to $168,000 plus $6,200 plus $14,300 plus $1,500, which is $190,000.

Her net worth was $270,500 minus $190,000, or $80,500. Marta felt a bit proud and a bit surprised. She had thought she was behind.

Three months later she checked again. Her mortgage had dropped to $166,800. Her car loan was down to $5,300. Her student loan was $13,600. Her card was paid off. Her 401(k) had grown to $43,200, and her savings were $9,400. The house and car held steady.

Her new assets were $9,400 plus $43,200 plus $11,000 plus $210,000, which is $273,600. Her new liabilities were $166,800 plus $5,300 plus $13,600, which is $185,700. Her net worth was $273,600 minus $185,700, or $87,900. That was a gain of $7,400 in one quarter, from $80,500 to $87,900.

Notice what moved the number. Part came from paying down loans. Part came from account growth. Marta could see both, and that clarity is the whole point.

Where it goes wrong

I have made this mistake myself, so I say it kindly. The first trap is counting a home at its asking price instead of its likely sale price. Real estate costs money to sell, and the final price may fall short of the hope. A number that flatters you feels nice for one day and helps you not at all.

The second trap is leaving out debts. A forgotten card balance or a small loan from a relative still counts. A list that leaves out liabilities is only half a list.

A third trap is checking so often that you chase noise. Markets rise and fall, and a daily look can sour your mood over changes that mean little. Stick to your schedule.

The fourth trap is comparing your number to a friend's. Their house, their job, their family, and their luck all differ from yours. Your best comparison is your own number from last quarter.

One more thing. A drop in net worth is not always a failure. If you take out a loan to buy a home, your assets and liabilities both rise, and your net worth may barely move at first. And if the stock market dips, your number may fall for a while through no fault of your own. Look at the trend over a year or two, not a single reading.

Questions to answer before you leave this page

Do you know which day this month you will gather your statements and write it all down? Have you decided how you will count your home, your car, and your retirement accounts, and will you count them the same way every time? Is there a debt you have been avoiding looking at, and could you list it today with its true balance? Will you check once a quarter, once a month, or on some other steady schedule, and have you put that date on your calendar? Where will you keep your numbers so that next quarter you can compare them to this one? And when the number surprises you, up or down, will you be kind enough to yourself to ask what changed before you decide what it means?