# Reading a bank's balance sheet like an insider
JPMorgan Chase, the largest U.S. bank, holds roughly $4 trillion in assets. Open its balance sheet and you find something that confuses most people on day one: the money you deposit shows up as a *liability*, not an asset. Meanwhile, the loans the bank hands out to strangers are counted as *assets*.
This is not an accounting trick. It is the entire logic of banking, and once you see it, the whole business model clicks into place.
Start with your checking account. When you deposit $10,000, that money is not the bank's to keep. It owes it back to you, on demand, whenever you want it.
An asset is something you own or are owed. A liability is something you owe to someone else. From the bank's point of view, your deposit is a debt it must repay. So it sits on the liabilities side.
Deposits are actually a bank's favorite kind of debt. They are cheap. A checking account might pay you almost nothing in interest, and even a savings account pays far less than what the bank charges borrowers. Cheap, stable funding is the raw material of the entire operation.
This is why banks fight so hard for your direct deposit and your primary checking relationship. Those "sticky" deposits (money that stays put and does not chase the highest rate) are the cheapest fuel they can get.
Now flip to the other side. When JPMorgan lends a business $1 million, the bank is owed that money back, plus interest. Being owed money is an asset.
So the core move of banking is simple to state:
On JPMorgan's balance sheet, loans are one of the largest asset categories: mortgages, credit card balances, auto loans, and commercial loans to companies. Alongside loans sit securities (things like U.S. Treasury bonds the bank buys to earn a safe return) and cash held at the Federal Reserve.
Here is a stripped-down version of how a big bank's balance sheet is shaped. These are illustrative proportions, not exact JPMorgan figures.
| Assets | Liabilities and Equity |
|---|---|
| Cash and reserves | Deposits (the big one) |
| Loans | Long-term debt |
| Securities (Treasuries, etc.) | Other borrowings |
| Other assets | Equity (shareholders' stake) |
The two sides must balance. Assets equal liabilities plus equity, always. That is why it is called a balance sheet.
Equity is the sliver at the bottom: what would be left for shareholders if the bank sold every asset and paid off every debt. For a large U.S. bank, equity is often around 8 to 12 percent of total assets. That thin cushion is why banks are called *highly leveraged*: they operate mostly on borrowed (deposited) money.
You can see the real thing yourself. Public banks file quarterly reports with the SEC. Search JPMorgan's filings on the free SEC EDGAR database and open a recent 10-KKThe average number of new users each existing user generates through referrals. Above 1.0, growth compounds on itself and becomes exponential.View full definition → (the annual report) to find the actual balance sheet.
Now for the number that drives everything: net interest margin, or NIM.
NIM measures the gap between what a bank earns on its assets and what it pays on its liabilities, relative to its assets. In plain terms:
> NIM = (interest earned on loans and securities − interest paid on deposits and debt) ÷ average interest-earning assets
If a bank earns 5 percent on its loans and securities and pays 1.5 percent on its deposits and borrowings, its net interest margin is roughly 3.5 percent. For large U.S. banks, NIM commonly sits somewhere in the 2 to 3.5 percent range, though it moves with interest rates.
That may sound small. But apply 2.5 percent to trillions of dollars in assets and you get tens of billions in net interest income, which is often the single biggest source of a bank's revenue.
NIM is not fixed. It breathes with the rate environment set largely by the Federal Reserve.
When the Fed raises rates, banks can often charge more on new loans quickly, while the rates they pay on deposits rise more slowly. NIM widens. When rates fall, or when depositors demand higher payouts to keep their money from leaving, NIM compresses.
Here is the tension every bank manages: if it pays too little on deposits, customers leave for higher-yielding options (money market funds, high-yield savings apps, or rival banks). If it pays too much, NIM shrinks. This is called deposit beta: how much of a rate increase a bank has to pass on to depositors to keep them.
A balance sheet is a snapshot, but banking risk lives in the mismatches inside it.
Maturity mismatch. Deposits can be withdrawn instantly. Loans (a 30-year mortgage, say) are locked in for years. The bank promises short-term money against long-term assets. Usually fine. Occasionally catastrophic.
This is exactly what sank Silicon Valley Bank in 2023. It had loaded up on long-term bonds. When rates rose, those bonds lost market value, and when depositors rushed to pull funds all at once (a bank run), SVB had to sell those bonds at a loss to raise cash. The mismatch turned fatal.
Credit risk. Some borrowers do not repay. Banks set aside a loan loss reserve (money parked to absorb expected defaults). Watch this line: rising reserves signal the bank expects more borrowers to struggle.
Capital adequacy. Regulators require banks to hold minimum equity against their assets, weighted by risk. These are the Basel rules (an international framework named after Basel, Switzerland). The idea: the riskier your assets, the more equity cushion you must hold. A well-capitalized bank can absorb losses without collapsing.
Knowledge check
1. Why does a customer's checking deposit appear on the liabilities side of a bank's balance sheet?
2. A loan the bank issues to a business is classified as an asset because:
3. Why do banks compete aggressively for customers' primary checking relationships and direct deposits?
4. Select ALL correct answers describing the core profit logic of banking as presented in the lesson.
Select all the correct answers.
5. Select ALL correct answers that would appear on the ASSET side of a bank's balance sheet.
Select all the correct answers.
When a professional opens a bank's balance sheet, they scan for a few things fast.
Deposit mix. What share is cheap checking versus expensive time deposits? A bank heavy in non-interest-bearing deposits has a funding-cost advantage that shows up directly in NIM.
Loan quality trends. Are loan loss reserves climbing? Are non-performing loans (borrowers who have stopped paying) rising? These hint at future losses before they hit the income statement.
NIM direction. Is the margin expanding or compressing quarter over quarter? Management will explain why in the earnings call, and the reasons (deposit competition, rate moves, loan repricing) tell you where profits are heading.
Leverage and capital. How thick is the equity cushion relative to assets? A strong capital ratio means resilience; a thin one means fragility if losses spike.
Think of a bank as a spread business built on trust. It borrows short and cheap (your deposits), lends long and higher (loans and securities), and lives on the difference (NIM). The balance sheet shows the machine at rest; NIM shows it running.
The genius and the danger are the same feature: leverage. A small margin on a giant balance sheet produces enormous profit. But the same leverage means a small shock (a run, a wave of defaults, a rate spike) can wipe out that thin equity cushion fast.