Why a bank's balance sheet is inverted: deposits as liabilities and loans as assets

Why does a bank *want* liabilities? Because deposits are cheap funding. A checking account might pay you close to 0% interest. That money can then be lent out at much higher rates. The gap is where banks make money.

Regulators pay close attention to deposits because they can leave quickly. In 2023, Silicon Valley Bank collapsed in days when depositors pulled funds faster than the bank could sell assets to cover them. A deposit is a liability that can walk out the door.

Loans Are Money Owed to the Bank

Now the other side. When JPMorgan issues you a mortgage, an auto loan, or a business credit line, you owe the bank future payments. That stream of future payments is an asset: something the bank owns and expects to collect.

On the balance sheet:

• Loans are the bank's biggest asset category at most commercial banks.
• Banks also hold securities (like US Treasuries), cash, and reserves at the Federal Reserve as assets.

So the "inverted" logic is really just consistent logic:

| Your view | JPMorgan's view |

|---|---|

| Your deposit is your asset | The deposit is JPMorgan's liability |

| Your loan is your debt | The loan is JPMorgan's asset |

Same dollar, opposite sign, depending on whose books you read.

You can see this structure yourself in JPMorgan's public filings on the SEC EDGAR database. Pull 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.Voir la définition complète → annual report and find the consolidated balance sheet. Deposits will be under liabilities, loans under assets.

How Banks Make Money: Net Interest Margin

Once you see deposits as cheap borrowing and loans as high-yielding lending, the core profit engine becomes obvious.

Net interest income is the difference between the interest a bank earns on its assets (loans, securities) and the interest it pays on its liabilities (deposits, borrowings).

Net interest margin (NIM) expresses that spread as a percentage of the bank's interest-earning assets:

> NIM = (Interest earned - Interest paid) / Average interest-earning assets

A simplified example:

• JPMorgan pays depositors an average of 2% on funding.
• It earns an average of 6% on loans and securities.
• The spread is roughly 4 percentage points.

For large US banks, actual NIM commonly runs in the range of 2% to 3.5%, and JPMorgan has reported figures around that range in recent years. On trillions of dollars in assets, even a small margin generates enormous income.

Why NIM Drives the Whole P&L

Net interest income typically makes up a large share of a traditional bank's revenue. (JPMorgan also earns big fees from trading, asset management, and investment banking, so it is more diversified than a pure retail lender.)

Because NIM is a spread, it is highly sensitive to interest rates set by the Federal Reserve (the US central bank). Here is the tension:

• When the Fed raises rates, banks can often charge more on new loans quickly.
• But they may be slow to raise deposit rates, widening the margin.
• Over time, depositors demand higher rates or move money to higher-yielding accounts, compressing the margin again.

This is why bank analysts obsess over the phrase "deposit beta," meaning how much of a rate increase a bank has to pass through to depositors. A low deposit beta protects NIM. A high one squeezes it.

The Risk Hiding in the Structure

The inverted balance sheet creates a built-in vulnerability called maturity mismatch (also called maturity transformation).

• Deposits are short-term and can be withdrawn instantly.
• Loans are long-term. A 30-year mortgage is locked in for decades.

The bank borrows short and lends long. In normal times, this is profitable because short-term rates are usually lower than long-term rates. But it means a bank can never satisfy all depositors at once, because most of its assets are tied up in loans it cannot instantly convert to cash.

This is exactly why bank runs are dangerous and why regulators require capital (equity buffers) and liquidity (readily available cash) minimums. The 2023 regional bank failures were, at their core, maturity mismatch problems: banks held long-dated bonds that lost value when rates rose, and depositors fled before the losses could be absorbed.

Putting It Together on JPMorgan's Books

Let's assemble a stylized version of the structure (not exact figures, but the correct shape):

Assets

• Loans (mortgages, credit cards, commercial loans): the largest earning asset
• Securities (mostly Treasuries and agency bonds)
• Cash and reserves at the Fed

Liabilities

• Deposits: the largest and cheapest funding source
• Long-term debt and other borrowings

Equity

• Common stock and retained earnings: the cushion that absorbs losses

Now trace one transaction. You deposit $10,000. JPMorgan records:

• +$10,000 cash (asset)
• +$10,000 deposit (liability)

The balance sheet stays balanced. Then the bank lends $8,000 of it to a small business (keeping some as reserves):

• Cash drops by $8,000
• Loans (asset) rise by $8,000

The business pays 7% interest. You earn maybe 1% on your deposit. That 6-point gap, repeated across millions of accounts, is the beating heart of the bank.

Why "Non-Interest" Matters Too

One caveat so you are not misled: modern megabanks are not just spread machines. A meaningful portion of JPMorgan's revenue comes from non-interest income: advisory fees, card fees, trading revenue, and asset management. This diversification is one reason large banks weathered the 2023 stress better than narrow regional lenders that depended almost entirely on NIM.

Still, for understanding *why* the balance sheet is structured the way it is, deposits-as-liabilities and loans-as-assets remains the foundation.

Key Takeaways

• Your deposit is the bank's liability. You lent the bank money it must repay on demand, so it appears on the liabilities side of the balance sheet.
• Your loan is the bank's asset. Future repayments are money owed to the bank, making loans the largest earning asset for most commercial banks.
• Net interest margin (NIM) is the core profit engine. It is the spread between what a bank earns on assets and pays on liabilities, typically 2% to 3.5% for large US banks, applied across trillions in assets.
• The structure creates maturity mismatch. Banks borrow short (deposits) and lend long (loans), which is profitable but fragile, and is why capital and liquidity regulation exists.
• Read a real 10-K. Pull JPMorgan's balance sheet from SEC EDGAR and locate deposits under liabilities and loans under assets to see the inversion firsthand.