The simple definitions behind net worth
An asset is anything you own that has monetary value: cash, investment accounts, retirement accounts, real estate, a vehicle, even valuable personal property. A liability is anything you owe: a mortgage, a car loan, credit card balances, student loans, any other debt. Net worth is just the difference between the two. Simple in theory, but the details of how to count each one correctly matter more than they seem at first.
Not every asset counts the same way
Liquid assets, cash and investments you could sell quickly, behave very differently from illiquid ones like home equity or a retirement account you can't touch without penalty for decades. Both are real net worth, but only liquid assets are available to cover an emergency or a near-term goal. When looking at your own numbers, it's worth tracking both the total and the liquid portion separately, rather than treating all assets as equally accessible.
A useful three-way split: cash and cash equivalents, available immediately; investments that could be sold within a few days but may carry tax consequences or market timing risk; and illiquid assets, retirement accounts before a certain age, home equity, that are real wealth but effectively locked up for a long time. Someone with a $400,000 net worth almost entirely in home equity is in a very different position than someone with the same net worth split across a brokerage account and a savings account, even though the single number looks identical.
A common mistake: counting an asset at its sticker price
A car is an asset, but it's also a depreciating one, and a mortgage attached to a home means only the equity, the home's value minus what's still owed, counts toward net worth, not the full market value of the property. Counting the full value of a financed asset while ignoring the liability attached to it is one of the most common ways people overstate their own net worth without realizing it.
For example, a car worth $22,000 with an $18,000 loan balance against it contributes $4,000 to net worth, not $22,000. A home worth $450,000 with a $310,000 mortgage balance contributes $140,000, not the full sale price. Forgetting the attached liability, or using the original purchase price instead of current market value, are the two most common distortions people introduce without meaning to.
Assets and liabilities that are easy to overlook
On the asset side, it's common to forget smaller retirement accounts from a previous employer, unused gift cards or store credit of real value, or equity in a small business or side venture. On the liability side, it's easy to leave out a 0% promotional balance on a store card simply because no interest is accruing yet, an outstanding tax bill, or money owed informally to family or friends. A proper net worth calculation should include both sides fully, even the uncomfortable ones, since leaving a liability out doesn't make it disappear, it just makes the number less accurate.
Why the split matters for decisions, not just scorekeeping
Understanding which side of your balance sheet is growing and which is shrinking points directly at what to do next. A net worth that's flat because assets are growing but liabilities are growing just as fast calls for a different response, usually addressing new borrowing, than one that's flat because of market losses, which often calls for patience rather than any change in behavior at all.
For a broader look at how these pieces combine into one number, see What Is Net Worth?, or plug your own numbers into the Net Worth Calculator to see where you currently stand. For the habits that move the total, How to Increase Your Net Worth covers the three levers that actually matter.