The Tier 1 Leverage Ratio is Tier 1 capital divided by average total consolidated assets — a non-risk-weighted capital adequacy measure under Basel III. The minimum requirement is 4% for adequately capitalized banks; well-capitalized banks must maintain 5%+.
The Tier 1 Leverage Ratio is one of the core capital adequacy measures in the Basel III regulatory framework, implemented in the United States through the Federal Reserve's, OCC's, and FDIC's capital rules (12 CFR Part 3 for national banks — https://www.ecfr.gov/current/title-12/chapter-I/part-3). Unlike risk-based capital ratios, the leverage ratio uses total average assets as the denominator — providing a simple, non-manipulable backstop against excessive leverage regardless of how assets are risk-weighted. Tier 1 Capital is the highest-quality regulatory capital, consisting primarily of common equity Tier 1 (CET1) components plus certain additional Tier 1 instruments. The OCC, FDIC, and Federal Reserve define minimum ratios in their Prompt Corrective Action (PCA) framework: 'well-capitalized' requires Tier 1 leverage ratio of 5%+; 'adequately capitalized' is 4%+; below 3% triggers 'undercapitalized' designation with regulatory restrictions. For large, globally systemically important banks (G-SIBs), the Fed's Enhanced Supplementary Leverage Ratio (eSLR) rule imposes a 5% minimum at the holding-company level and 6% minimum at the bank subsidiary level — above the Basel III 3% global minimum. FDIC-insured institutions report Tier 1 leverage ratios on call reports (Schedule RC-R — https://www.ffiec.gov/npw/) each quarter. For small business borrowers, a bank's Tier 1 leverage ratio signals how much lending capacity it has relative to its equity base. A well-capitalized bank (5%+ leverage ratio with growing capital) is more likely to expand lending; an undercapitalized bank is under regulatory pressure to shrink its balance sheet — often contracting credit availability first in small business and commercial lending.
4% for adequately capitalized banks under US PCA rules; 5% to be classified as well-capitalized. Basel III globally requires 3% minimum. US regulators have historically maintained higher domestic standards than the Basel minimums. G-SIBs face higher requirements under the Enhanced Supplementary Leverage Ratio (eSLR).
Risk-based capital ratios (CET1, Tier 1 Risk-Based, Total Capital Ratio) use risk-weighted assets as the denominator — assets are weighted 0–150%+ based on credit risk. The leverage ratio uses total average assets, with no risk-weighting. The leverage ratio serves as a non-risk-weighted backstop so banks can't optimize their way to apparent capital adequacy through risk weighting alone.
FFIEC BankFind Suite at ffiec.gov/npw/ — call report Schedule RC-R shows capital ratios for every FDIC-insured institution. Bank holding company financial data is also in Federal Reserve Y-9C filings. For large publicly traded banks, capital ratios appear in quarterly earnings releases and 10-Q filings.