Net worth and personal cash flow
A household has the same two statements as a company: a balance sheet that says what it owns and owes at one moment, and a cash flow that says what came in and went out over a period. This lesson builds both for an invented household, shows why net worth can rise even when nothing is saved, and sets the household against the Federal Reserve's Survey of Consumer Finances and the US saving rate. A calculator moves spending, investment returns and home prices to show what changes net worth.
- Level
- Beginner
- Reading time
- About 24 minutes
- Know this first
- The cash flow statement
By the end you will be able to:
- build a personal balance sheet and work out net worth
- build a yearly cash flow and work out a savings rate
- explain why net worth changes by more than the amount saved
- tell the median from the mean in wealth data and say why they differ
- say what a saving rate does and does not tell you
Two statements for one household
Earlier lessons showed that a company is described by a balance sheet and a cash flow statement. A household needs the same two. The balance sheet lists what you own and what you owe on one day. The cash flow lists what came in and what went out over a period. The difference between the two sides of the balance sheet is your net worth. The Federal Reserve defines it in the same way for families: gross assets minus liabilities.
This lesson builds both statements for an invented household, so every number can be checked, and then compares it with two real sources: the Federal Reserve’s Survey of Consumer Finances and the US Bureau of Economic Analysis’s saving rate. The key point, which a calculator lets you test, is that net worth does not change only by what you save. It also changes when the things you own change in price.
The personal balance sheet
List assets, the things you own that have a value: cash and savings, investments, a home, a car. List liabilities, the amounts you owe: a mortgage, a car loan, a credit card balance. Then subtract. The household below is invented. It earns $5,200 a month after tax, which is $62,400 a year. The same layout as a company balance sheet applies, which is covered in the balance sheet lesson.
| Asset | Amount, $ | Liability | Amount, $ |
|---|---|---|---|
| Cash and savings | 12,000 | Mortgage | 210,000 |
| Investments | 45,000 | Car loan | 9,000 |
| Home | 300,000 | Credit card | 3,000 |
| Car | 14,000 | ||
| Total assets | 371,000 | Total liabilities | 222,000 |
Total assets are $371,000 and total liabilities are $222,000, so net worth is $149,000. Two things are worth noticing. First, most of the wealth is in one asset that cannot be spent: the home is worth $300,000 against only $12,000 of cash. Second, the values are estimates. A bank balance is exact, but a home or a car is worth what a buyer would pay, which is only known when it is sold. A personal balance sheet is therefore best read as a rough, regularly updated estimate. Ordinary spending is paid from cash and income, not from the home. The cash would cover about 2.7 months of the spending used below, a point the next lessons return to.
The personal cash flow
The balance sheet is a photograph. The cash flow is the film between two photographs. Start with take-home pay, subtract everything spent, and what remains is the amount available to save or to repay debt. In the table, spending includes the interest on the mortgage and everything else the household buys, but not the part of the mortgage payment that repays principal, because repaying principal reduces what is owed rather than being a cost.
| Item at the starting settings | Dollars a year |
|---|---|
| Take-home pay | 62,400 |
| Spending, 4,400 dollars a month | −52,800 |
| Left after spending | 9,600 |
| Mortgage principal repaid | −4,000 |
| Moved into investments | 5,600 |
The household has $9,600 left after spending. Dividing by take-home pay gives a savings rate of 15.38%. This lesson counts the repayment of mortgage principal as saving, because it raises net worth by the same amount. Of the $9,600, $4,000 repays the mortgage and $5,600 is added to investments.
How the two statements connect
If the only thing that happened were saving, net worth would rise by exactly the amount saved. It rarely does, because the assets are revalued. Stocks move, home prices move, and a car loses value every year. Those changes are not cash flows. Nobody paid or received anything, yet net worth changed. So the change in net worth has two parts: what you saved, and what happened to the prices of what you own.
| Change in net worth over the year | Dollars |
|---|---|
| Net worth at the start | 149,000 |
| Saved into investments | +5,600 |
| Mortgage principal repaid | +4,000 |
| Investment returns, 6% | +2,700 |
| Home price rise, 2% | +6,000 |
| Car losing 15% of its value | −2,100 |
| Net worth at the end | 165,200 |
At the starting settings, the household saved $9,600 through spending less than it earned. Its net worth rose by $16,200, to $165,200. The difference is $6,600 of net price changes: investment returns and a rising home price, less the car losing value. This is the same split that appears in a company, where profit can differ from cash. For a household, saving is something you control, and price changes mostly are not.
What the data show
Every few years the Federal Reserve interviews thousands of US families for the Survey of Consumer Finances. The 2025 survey interviewed 4,367 families, and its results were published on 9 October 2026. The median family had a net worth of $215,900 in 2025, against $211,100 in 2022, in 2025 dollars. The mean was $1,241,500, against $1,164,100. The two moved by different amounts, up 2 percent and up 7 percent.
The gap between them matters. The median is the middle family: half have less and half have more. The mean is the total divided by the number of families, which a small number of very wealthy families pull upward. Here the mean is about 5.8 times the median. The table shows the same pattern in every age group.
| Age of reference person | Median, $ thousands | Mean, $ thousands | Mean as a multiple of median |
|---|---|---|---|
| Under 35 | 33.0 | 135.4 | 4.1× |
| 35 to 44 | 155.6 | 681.9 | 4.4× |
| 45 to 54 | 253.7 | 1,244.5 | 4.9× |
| 55 to 64 | 411.9 | 1,878.0 | 4.6× |
| 65 to 74 | 431.3 | 1,897.6 | 4.4× |
| 75 and over | 504.9 | 1,962.2 | 3.9× |
Median net worth rises with age, from $33.0 thousand for families under 35 to $504.9 thousand for those 75 and over, which fits a lifetime of saving and of assets gaining value. In every group the mean is far above the median: about 4.1 times for families under 35, 4.4 times for 35 to 44, and 3.9 times for those 75 and over. When someone quotes an “average” net worth, the median is the more useful guide to what a typical family has. The survey is a snapshot of different families at one time, so the table does not show how a single family’s wealth grows as it ages.
The saving rate is a different kind of data. The Bureau of Economic Analysis measures personal saving as personal income less personal outlays and taxes, and divides it by disposable personal income. It is a national measure covering all households, and it is calculated from national accounts rather than from a survey of families. The series moves a lot.
| Month | US personal saving rate |
|---|---|
| April 2020 | 31.8% |
| June 2022 | 2.4% |
| June 2026 | 4.4% |
| July 2026 | 4.6% |
| August 2026 | 4.1% |
In April 2020 the rate reached 31.8%. In June 2022 it was 2.4%. In August 2026, the latest month in the source, it was 4.1%. The series alone does not explain these moves. It shows how far a national average can swing, and that the invented household’s rate of 15.38% is well above the recent national figure. The national rate and the household’s rate are also not the same measure: the national one is defined by the Bureau of Economic Analysis for all households together, and it says nothing about any one household.
Move spending, markets and home prices
The calculator starts from the balance sheet above and runs one year. Choose the household’s monthly spending, the return on its investments and the change in the price of its home. Three things are held fixed: the mortgage principal repaid is $4,000, the car loses 15 percent of its value, and the car loan and card balances stay as they are. Whatever is left after spending and the $4,000 of principal goes into investments, and if that is negative, investments are drawn down.
With spending of $4,400 a month, investments returning 6% and home prices up 2%, net worth moves from $149,000 to $165,200, a change of +$16,200. The savings rate is 15.38% of take-home pay. Saving into investments: +$5,600; debt repaid: +$4,000; investment returns: +$2,700; home prices: +$6,000; the car: −$2,100.
Four experiments. First, leave the starting settings alone. Net worth rises $16,200 to $165,200, of which $9,600 comes from spending less than is earned. Second, set spending to $5,200 a month, which uses all of the take-home pay. The savings rate falls to 0.00%, investments are drawn down by $4,000 to cover the mortgage principal, and yet net worth still rises $6,600, to $155,600, because the home and the investments gained in price. Rising prices can hide a household that is saving nothing. Third, return spending to $4,400 and set investments to −20% and the home to −10%. Saving is unchanged, but net worth falls $31,500, to $117,500, because investments lose $9,000 and the home loses $30,000. Fourth, set spending to $3,000 with no price changes. The savings rate is 42.31%, the household adds $22,400 to investments and repays $4,000 of its mortgage, and net worth rises $24,300 to $173,300. Without price changes, the only things that move net worth are saving and repaying debt, apart from the car’s loss of value.
What this lesson leaves out
- An invented household. The balance sheet and the figures are made up to make the mechanics visible. They are not typical of any group, and the real data in the lesson describe all US families, not this one.
- One year, with fixed items. The calculator holds the mortgage repayment, the car’s depreciation and the other debts fixed. Real debts change with interest, and real incomes change from year to year.
- Interest on the other debts. The car loan and card balances are held constant, and the cost of their interest is treated as part of spending.
- Taxes and employer benefits. Take-home pay is taken as given. Pension contributions and employer benefits are not modelled here.
- Different measures of saving. The household’s savings rate counts debt repayment as saving. The national rate uses the Bureau of Economic Analysis’s own definition, so the two are not directly comparable.
- No advice. The lesson explains the statements. It does not say how much any household should save or how to invest.
Common mistakes
Leaving out liabilities
Listing only what you own overstates your position. Net worth is assets minus liabilities.
Treating a high income as high net worth
Income is a flow and net worth is a stock. A household can earn a lot and still own little if it spends nearly all of it.
Counting price gains as saving
A rising home price or share price raises net worth without any act of saving. It can also fall away, as the third experiment shows.
Valuing assets too hopefully
A home or a car is worth what a buyer would pay, not what was paid for it. Use an honest estimate, and update it.
Quoting the mean as typical
Because a small number of very wealthy families lift the mean, the median is closer to what a typical family has.
Try it yourself
1. A household owns $12,000 in cash, $45,000 of investments, a $300,000 home and a $14,000 car. It owes $210,000 on a mortgage, $9,000 on a car loan and $3,000 on a card. What is its net worth?
Show the working
Assets are 12,000 + 45,000 + 300,000 + 14,000 = 371,000. Liabilities are 210,000 + 9,000 + 3,000 = 222,000. Net worth is 371,000 − 222,000 = $149,000.
2. Take-home pay is $62,400 a year and spending is $4,400 a month. What is the savings rate?
Show the working
Spending is 4,400 × 12 = 52,800. Left over is 62,400 − 52,800 = 9,600. Dividing, 9,600 ÷ 62,400 = 15.38%.
3. Of the $9,600 left over, $4,000 repays the mortgage. Investments earn 6% on $45,000, the home rises 2% on $300,000 and the car loses 15% of $14,000. By how much does net worth change?
Show the working
Saved to investments 5,600, plus mortgage repaid 4,000, plus investment returns 2,700, plus the home 6,000, less the car 2,100: $16,200.
4. With the same saving, investments fall 20% and the home falls 10%. What is the change in net worth?
Show the working
5,600 + 4,000 − 9,000 − 30,000 − 2,100 = −$31,500, so net worth falls to $117,500.
5. In the 2025 survey, families aged 35 to 44 had median net worth of $155.6 thousand and mean net worth of $681.9 thousand. How many times larger is the mean, and what does it tell you?
Show the working
681.9 ÷ 155.6 = 4.4 times. A small number of families with large net worth pull the mean far above the median, so the median describes the typical family better.
Where this is used
- A lender asks for assets and liabilities when deciding whether to lend to a person.
- A household keeps a net worth figure, updated once or twice a year, to see whether it is making progress.
- A financial planner starts from the balance sheet and the cash flow before talking about goals.
- A researcher uses surveys such as the Survey of Consumer Finances to describe wealth and how it is distributed.
- An analyst reading a company uses the same two statements, which makes personal finance a good way to learn them.
Key terms
- Asset
- Something owned that has a value.
- Liability
- An amount owed.
- Net worth
- Assets minus liabilities.
- Personal balance sheet
- A list of assets and liabilities at one date.
- Personal cash flow
- The money received and spent over a period.
- Savings rate
- The share of take-home pay not spent.
- Median
- The middle value, with half of the families above and half below.
- Mean
- The total divided by the number of families.
- Depreciation
- The fall in an asset’s value as it ages or is used.
- Principal
- The amount borrowed and still owed, apart from interest.
Questions people ask
Is a home counted in net worth?
Yes. It is an asset, and the mortgage against it is a liability. The Survey of Consumer Finances defines net worth as gross assets minus liabilities.
Why can net worth rise when I save nothing?
Because the things you own can rise in price. The second experiment shows a household with a zero savings rate whose net worth still grows.
Why do the median and the mean differ so much?
A few families with very large net worth raise the mean but do not move the median much. In the 2025 survey the mean for all families was about 5.8 times the median.
Should debt repayment count as saving?
For net worth it does, since it reduces a liability by the same amount. Some measures count it differently, so check the definition when comparing rates.
Sources and review
- Board of Governors of the Federal Reserve System, Changes in U.S. Family Finances from 2022 to 2025: Evidence from the Survey of Consumer Finances (9 October 2026), for median and mean net worth of all families in 2022 and 2025, net worth by age of the reference person (table 2), the definition of net worth and the number of families interviewed.
- US Bureau of Economic Analysis, Personal saving rate (PSAVERT), percent, seasonally adjusted annual rate, monthly, as published by the Federal Reserve Bank of St. Louis (last updated 30 September 2026), for the values in the table and the series definition of personal saving.
How the numbers were checked: the balance sheet, the cash flow, the bridge and the four experiments were recomputed in plain code, and the ratios of mean to median were recomputed from the table in the source. The calculator, which runs separately, was compared with that code for every combination of settings it allows. The household is invented.