How do I read a bank's balance sheet?

A bank's balance sheet lists loans and securities as its main assets, deposits and borrowings as its main liabilities, and shareholders' equity as the difference. The categories look different from other industries because a bank's core business is borrowing money (deposits) and lending it out (loans), so the balance sheet shows where most of a bank's operating activity lives

If you pick up the balance sheet of a manufacturing company, its assets are mostly factories, equipment, and inventory. A tech company's assets might be cash and intangible property. A bank's balance sheet looks nothing like either of these, because the bank's core business IS its balance sheet.

Banks take in deposits (liabilities) and lend that money out as loans (assets), earning the spread between what they charge borrowers and what they pay depositors. That makes the balance sheet the operating core of the business, not just a financial snapshot. Nearly every important bank metric, from net interest margin to return on assets, ties directly back to the balance sheet.

The fundamental accounting equation still applies: assets equal liabilities plus equity. But the composition of each side is completely different from non-financial companies, and understanding those differences is the starting point for bank analysis.

The Asset Side

Loans are the largest asset category for most banks, often representing 60% to 75% of total assets. They are reported net of the allowance for credit losses (ACL), a reserve that reflects management's estimate of expected loan defaults. The size of the allowance relative to total loans signals how much credit risk the bank is carrying.

Loan portfolios are broken down by type, and the mix tells you where the bank has placed its bets. Common categories include:

  • Commercial and industrial (C&I) loans, made to businesses for working capital and operating needs
  • Commercial real estate (CRE) loans, backed by office buildings, retail space, apartment complexes, and other properties
  • Residential mortgages, including loans the bank holds on its books and loans originated for sale to the secondary market
  • Consumer loans, covering auto loans, credit cards, and personal lines of credit
  • Construction and development loans, which fund new building projects and typically carry higher risk because the collateral is not yet complete

A bank concentrated heavily in one loan type is more exposed to a downturn in that sector. A community bank in an agricultural region might have 60% of its loans in farmland and farm operating lines. A large regional bank will usually show a more balanced spread across all categories.

Investment securities are the second-largest asset category for most banks. They are divided into two accounting classifications:

  • Held-to-maturity (HTM) securities, recorded at amortized cost on the books regardless of current market prices
  • Available-for-sale (AFS) securities, recorded at fair value, with unrealized gains and losses flowing through accumulated other comprehensive income (AOCI) in equity

The distinction between HTM and AFS matters when interest rates move. Rising rates push bond prices down. AFS losses reduce reported equity through AOCI, while HTM losses remain unreported unless the bank sells or writes down the securities.

Cash, balances due from other banks, federal funds sold, and interest-bearing deposits at other institutions round out the liquid portion of the asset side. These assets earn lower yields but provide the liquidity cushion the bank needs for daily operations and unexpected deposit withdrawals.

The Liability Side

Deposits are the dominant liability, typically representing 70% to 85% of total liabilities. Not all deposits cost the bank the same amount, and the mix matters as much as the total:

  • Demand deposits (non-interest-bearing checking accounts) are free funding for the bank, costing nothing in interest expense
  • Savings and money market accounts pay interest but tend to be relatively stable and less rate-sensitive than other funding sources
  • Time deposits (certificates of deposit) carry fixed interest rates and fixed maturity dates, making them more expensive but predictable

A bank with a large share of non-interest-bearing deposits has a built-in cost advantage, since every dollar lent from that pool earns a wider spread. Analysts track the percentage of total deposits that are non-interest-bearing as one of the most telling indicators of a bank's funding quality. When that share declines, it usually means the bank is paying more for deposits, which pressures margins.

Borrowings fill the gap between deposits and lending needs. These include Federal Home Loan Bank (FHLB) advances, federal funds purchased, repurchase agreements, and subordinated debt. Borrowed funds are generally more expensive and less stable than deposits, so a bank that leans heavily on wholesale funding is paying more for its raw material and may face rollover risk if markets tighten.

Shareholders' Equity

The equity section includes common stock, additional paid-in capital, and retained earnings. What sets bank equity apart is the role of AOCI (accumulated other comprehensive income).

AOCI captures unrealized gains and losses on the bank's AFS securities portfolio. When rates move sharply, AOCI can swing by tens or hundreds of millions of dollars at larger institutions, directly affecting book value per share. Many bank analysts monitor tangible book value per share, which strips out goodwill and other intangibles, alongside AOCI trends to get a clearer picture of the equity base.

Total equity divided by total assets gives you the equity-to-assets ratio. Most banks operate in the 8% to 12% range, far lower than typical non-financial companies. Banks are inherently leveraged businesses, using deposits and borrowings to support an asset base many times larger than their equity, which is why even small changes in asset yields, funding costs, or credit losses can have an outsized impact on earnings.

Where to Start

When you open a bank's balance sheet for the first time, three numbers frame the big picture before you get into the details:

  • Total assets, which tells you the bank's size
  • The loans-to-assets ratio (total loans divided by total assets), which shows how aggressively the bank lends
  • The deposits-to-assets ratio (total deposits divided by total assets), which shows how the bank funds itself

From there, look at composition within each major category. On the asset side, check whether the loan portfolio is diversified or concentrated, and note the size of the allowance for credit losses relative to total loans. On the liability side, check what share of deposits are non-interest-bearing and how much the bank relies on borrowings.

The loans-to-deposits ratio ties both sides together. A ratio above 100% means the bank has lent out more than its deposit base and is making up the difference with borrowings. Most banks operate between 80% and 95%, though the right level depends on the bank's strategy and market conditions.

How Composition Varies Across Bank Types

Community banks, generally those under $10 billion in assets, tend to have straightforward balance sheets. Their loan books lean toward commercial real estate and small business lending, funded almost entirely by local retail deposits. Securities portfolios are smaller, and borrowings are minimal.

Regional banks in the $10 billion to $100 billion range carry more diversified loan portfolios, larger securities books, and more complex funding structures that blend core deposits with wholesale borrowings. They may also carry goodwill and other intangible assets from past acquisitions, which affects book value calculations. Comparing a community bank's balance sheet to a regional bank's requires adjusting for these structural differences.

The largest banks, those over $100 billion in assets, add another layer of complexity. Their balance sheets include trading assets, derivative positions, and substantial off-balance-sheet exposures from loan commitments, letters of credit, and swap agreements. Reading a large bank's balance sheet is a meaningfully different exercise from reading a community bank's, even though both follow the same accounting framework.

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Key terms: Net Interest Income, Earning Assets, Allowance for Credit Losses, Book Value Per Share — see the Financial Glossary for full definitions.

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