Know Your Numbers: Income, Expenses, Debt, and Net Worth
You can't manage what you don't measure. Before any conversation about investing, retirement, or wealth, there are four numbers every household should know cold:what comes in, what goes out, what you owe, and what you're worth. Most people can't name even two of them — and that blind spot, not the markets, is wheremost financial trouble starts.
The two flows: income and expenses
Income and expenses are flows — they happen every month. Income is usually easy to state; expenses almost never are. Studies of household budgeting consistently find that people underestimate their spending, because irregular costs (insurance premiums, gifts, repairs, travel) don't feel like “normal” months. There is no normal month.
The fix is simple but non-negotiable: track three full months of actual spending — every account, every card — and divide by three. That average, not your best month, is your real expense number. The gap between income and that number is your savings rate, the single most controllable driver of your financial future.
The two stocks: what you own and what you owe
Assets and debts are stocks — snapshots of where you stand. List everything you own that has real value: cash, investment and retirement accounts, home equity, business interests. Then list everything you owe: mortgage, student loans, car loans, credit cards. Subtract the second from the first and you have your net worth — the one number that summarizes your entire financial life on a single line.
Income is what you make. Net worth is what you keep. Only one of them is the scoreboard.
Not all debt is the same
Debt isn't automatically bad — it's a tool with a price. A sensible mortgage on an appreciating home at a reasonable rate can build wealth. A revolving credit card balance at a double-digit rate destroys it. The test is simple: compare the interest rate on the debt to what your money could reasonably earn invested. High-rate consumer debt almost always fails that test — paying it off is a guaranteed, tax-free “return” at that rate, which is why it usually comes first.
Build your one-page balance sheet
- List every asset with its current value — accounts, property, business interests.
- List every debt with its balance and its interest rate.
- Subtract debts from assets. That's your net worth today.
- Recalculate quarterly. The direction matters far more than the level.
A rising networth means your system works. A flat or falling one — despite a good income —means money is leaking somewhere, and the three-month expense exercise willshow you where.
Want a clear picture of where you stand? IPM Advisory helps families build their balance sheet, understand their savings rate, and turn four simple numbers into a plan.
