This article focuses on metrics unique to banks and how to use them to evaluate profitability, risk, funding, and valuation—going beyond generic ratios.
What you'll learn
How bank business models differ from other companies and why metrics must adapt
Key profitability metrics like NIM and efficiency ratio, and what moves them
Credit quality measures: NPL ratio, net charge-offs, and provision coverage
Capital and liquidity safety nets: CET1, LCR, and NSFR
Balance sheet structure metrics: loan-to-deposit ratio and deposit mix
Valuation lenses specific to banks: tangible book and P/TBV
Concept explanation
Banks are not typical companies that sell products for a markup. They transform short-term deposits into longer-term loans, earning the spread between interest income and interest expense. This makes the balance sheet the primary engine of profits and risks. As a result, you need a different toolkit from standard manufacturing or software analysis.
Profitability in banks hinges on net interest margin (NIM), fee income, and operating efficiency. But profitability alone can be misleading if it is generated by taking excessive credit or liquidity risk. That’s why bank analysis pairs income statement metrics with balance sheet and regulatory metrics.
Credit risk management is central. When the economy weakens, some loans stop paying—these become non‑performing loans (NPLs). Banks must provision for expected losses, which hits earnings before any actual cash loss occurs. The adequacy of these provisions and the bank’s capital buffer determine resilience through the cycle.
Finally, funding quality and liquidity matter. A bank that relies heavily on hot, price‑sensitive funding can see deposit flight in stress. Ratios like the loan‑to‑deposit ratio (LDR) and regulatory liquidity metrics give a window into the stability of funding and the ability to meet withdrawals.
Why it matters
Bank earnings can look stable until they aren’t. A bank with high NIM and rapid loan growth might be taking hidden risks—concentrated exposures, weak underwriting, or fragile funding. Sector‑specific metrics help you detect whether earnings are built on solid capital, diversified deposits, and disciplined credit standards.
Regulation is a defining feature. Capital ratios like Common Equity Tier 1 (CET1) and liquidity ratios (LCR, NSFR) set minimum safety cushions. Investors who understand these guardrails can better judge dividend safety, buyback capacity, and downside risk in downturns. Many bank failures trace back to insufficient capital or unstable funding rather than low profitability per se.
For valuation, traditional metrics like P/E are useful but incomplete. Because bank value is tightly linked to the balance sheet, tangible book value (TBV) and price‑to‑tangible‑book (P/TBV) often provide a clearer anchor. Combining P/TBV with return on tangible equity (ROTE) helps gauge whether the market is fairly pricing the bank’s ability to compound book value.
Calculation method
Below are core bank metrics, the intuition behind them, and how to calculate each. We also connect them to common line items like Operating Revenues and Net Assets.
Net Interest Margin (NIM)
What it captures: The average spread earned on interest‑earning assets after paying for funding.
Formula:
NIM = Net Interest Income / Average Interest-Earning Assets
Where Net Interest Income = Interest Income − Interest Expense.
Example: If Interest Income = 6.0, Interest Expense = 3.8, Net Interest Income = 2.2. If Average Interest‑Earning Assets = 50, then NIM = 2.2 / 50 = 4.4%.
Link to OperatingRevenues: For banks, Operating Revenues typically include Net Interest Income + Non‑interest Income (fees, trading, etc.). NIM isolates the core spread engine.
Efficiency Ratio
What it captures: Operating cost per unit of revenue; lower is better.
Formula:
Efficiency Ratio = Non-Interest Expense / (Net Interest Income + Non-Interest Income)
Example: Non‑interest expense 2.8; Net Interest Income 2.2; Non‑interest income 1.0 → Efficiency Ratio = 2.8 / 3.2 = 87.5% (high; suggests cost issues). Well‑run retail banks often target ~50%–60%.
Non‑Performing Loan (NPL) Ratio
What it captures: Share of loans that are past due or otherwise non‑accrual.
Formula:
NPL Ratio = Non-Performing Loans / Total Loans
Example: NPLs 0.9 on Loans 45 → 2.0%.
Provision Coverage Ratio (PCR)
What it captures: Reserve cushion against existing problem loans.
Formula:
Provision Coverage Ratio = Loan Loss Allowance / Non-Performing Loans
Example: Allowance 0.6 on NPLs 0.9 → PCR = 67%. Higher coverage suggests more conservative reserving.
Net Charge‑Off (NCO) Ratio and Cost of Risk
What it captures: Actual credit losses flowing through the P&L (NCOs) and total credit cost including provisions (Cost of Risk).
Formulas:
NCO Ratio = Net Charge-Offs / Average LoansCost of Risk = (Provisions for Credit Losses) / Average Loans
Example: Net charge‑offs 0.2 on average loans 46 → NCO Ratio = 0.43%. Provisions 0.4 → Cost of Risk = 0.87%.
Common Equity Tier 1 (CET1) Ratio
What it captures: Highest‑quality capital relative to risk‑weighted assets (RWA).
Formula:
CET1 Ratio = CET1 Capital / Risk-Weighted Assets
CET1 Capital is essentially common equity adjusted for regulatory deductions; RWA weights assets by risk.
Example: CET1 capital 5.5 on RWA 45 → CET1 = 12.2%.
Dividends and buybacks are constrained by capital requirements. A bank with CET1 only slightly above its regulatory minimum may have limited capital return capacity.
Loan‑to‑Deposit Ratio (LDR)
What it captures: How much of the loan book is funded by deposits (generally cheap and sticky) versus other sources.
Formula:
LDR = Gross Loans / Customer Deposits
Example: Loans 45; Deposits 50 → LDR = 90%. Very high LDR (e.g., >100%) implies reliance on wholesale funding.
Liquidity Coverage Ratio (LCR) and Net Stable Funding Ratio (NSFR)
What they capture: Ability to withstand short‑term outflows (LCR) and long‑term funding stability (NSFR).
Formulas (simplified):
LCR = High-Quality Liquid Assets / 30-day Net Cash OutflowsNSFR = Available Stable Funding / Required Stable Funding
Values at or above 100% indicate compliance with Basel standards.
Tangible Book Value per Share (TBVPS) and Price‑to‑Tangible‑Book (P/TBV)
What they capture: Equity value excluding intangibles per share, and how the market values that equity.
ROTE: Using Net Income 0.8 and average tangible common equity of, say, 6.2 → ROTE = 12.9%.
Interpretation: The bank combines decent profitability (NIM 4.6%, efficiency 56%) with acceptable credit metrics (NPL ~2%, coverage 70%) and solid capital/liquidity (CET1 12.5%, LCR 120%). Valuation at P/TBV 1.63 looks fair if ROTE can sustain ~13%; if ROTE fades to single digits, that multiple may compress.
Watch the relationship between Cost of Risk and NPLs. Rising provisions without a corresponding rise in NPLs can signal forward‑looking stress; falling provisions while NPLs rise may indicate under‑reserving risk.
Practical applications
Rate cycle analysis: If you expect rates to fall, NIM may compress as assets reprice faster than deposits. Favor banks with cheap, sticky deposits (low interest‑bearing deposit mix) and strong fee income to cushion NIM.
Credit downturn preparation: In a weakening economy, prioritize banks with lower NPL ratios, higher provision coverage, and robust CET1. Expect higher provisions and lower earnings—value might emerge if capital buffers are ample.
Funding stress filter: Use LDR and deposit composition. Banks with LDR well above 100% and high reliance on wholesale or non‑core deposits are more vulnerable to outflows. Cross‑check with LCR and NSFR.
Growth quality check: Rapid loan growth can boost NIM short‑term but raise future NPLs. Compare growth with underwriting signals (NCO trends, PCR) and capital consumption (CET1 vs. RWA growth).
Valuation alignment: Screen for P/TBV<1 with double‑digit ROTE and solid CET1—potential re‑rating candidates. Conversely, high P/TBV with low ROTE may require a clear path to efficiency gains or NIM tailwinds.
Capital return capacity: Dividends and buybacks depend on excess CET1 above regulatory buffers. Model how much CET1 headroom remains after stress (e.g., higher RWA, losses) to gauge payout sustainability.
Link to general metrics: Use Operating Revenues to benchmark efficiency ratio and revenue diversification; use Net Assets as a starting point for TBV and capital adequacy analysis.
Common misconceptions
よくある誤解
- A high NIM always means a better bank. High NIM can come from riskier loans or weak deposit franchises; check credit quality and funding.
- Low efficiency ratio guarantees safety. Strong cost control doesn’t offset poor underwriting or weak capital.
- CET1 above the minimum is enough. Buffers matter; a small cushion can vanish quickly in stress, limiting dividends and growth.
- P/E tells the full story. For banks, P/TBV and ROTE often better reflect balance‑sheet‑driven value creation.
- Deposits are always sticky. Mix matters: insured retail deposits are stickier than large, uninsured, or brokered deposits.
Summary
まとめ
- Banks require sector‑specific metrics because earnings come from balance sheet spread and risk transformation.
- Track profitability via NIM and efficiency ratio, not just top‑line Operating Revenues.
- Assess credit with NPL ratio, provision coverage, NCOs, and Cost of Risk.
- Evaluate resilience using CET1, LCR, NSFR, and the loan‑to‑deposit ratio.
- Anchor valuation with TBV, TBVPS, and P/TBV, and pair them with ROTE.
- Favor stable, low‑cost deposits and adequate capital buffers for through‑cycle strength.
- Use P/TBV screens (e.g., P/TBV<1 with strong ROTE) to spot potential mispricing.
Glossary
Net Interest Margin (NIM): Net interest income divided by average interest-earning assets; measures core spread profitability.
Efficiency Ratio: Non-interest expense divided by total revenue; lower indicates better cost control.
Non-Performing Loans (NPLs): Loans that are past due or otherwise on non-accrual status.
Provision Coverage Ratio (PCR): Loan loss allowance divided by NPLs; gauges reserve adequacy.
Net Charge-Offs (NCOs): Actual loan losses net of recoveries recognized during the period.
Common Equity Tier 1 (CET1): Highest-quality regulatory capital used to absorb losses.
Loan-to-Deposit Ratio (LDR): Gross loans divided by customer deposits; indicates funding reliance.
Liquidity Coverage Ratio (LCR): High-quality liquid assets relative to modeled 30-day net outflows.
Net Stable Funding Ratio (NSFR): Available stable funding relative to required stable funding over one year.
Tangible Book Value (TBV): Common equity minus goodwill and intangible assets.
P/TBV: Share price divided by tangible book value per share; a valuation multiple for banks.
ROTE: Net income to common divided by average tangible common equity; profitability on tangible equity.
Operating Revenues: For banks, the sum of net interest income and non-interest income.
Net Assets: Shareholders' equity; for banks often adjusted to tangible common equity for analysis.
