Supplementary Leverage Ratio (SLR)

Category: Capital Strength Ratio

Overview

The Supplementary Leverage Ratio (SLR) measures how much high-quality capital a large bank holds relative to everything it has at stake, not just the assets on its balance sheet. While the standard leverage ratio only counts on-balance-sheet assets, the SLR goes further by including off-balance-sheet commitments such as derivative contracts, repurchase agreements, and promises to lend money that haven't been drawn on yet.

The idea behind the SLR is straightforward. Before the 2007-2009 financial crisis, banks built up enormous exposure through off-balance-sheet activities that ordinary leverage measures did not capture. When those exposures generated real losses and funding demands, some banks lacked enough capital to absorb them. The SLR closes that gap by requiring large banks to hold Tier 1 capital against their total exposure, including those off-balance-sheet positions.

The SLR applies only to banking organizations with $250 billion or more in total consolidated assets or $10 billion or more in on-balance-sheet foreign exposures, along with their insured depository institution subsidiaries. The minimum SLR requirement is 3%, but Global Systemically Important Banks (G-SIBs) face higher thresholds.

Because the SLR denominator includes off-balance-sheet exposures, it always produces a lower ratio than the standard leverage ratio for the same bank. A bank reporting a 9% Tier 1 Leverage Ratio might show an SLR of only 6%, with the gap reflecting the size of its derivatives book, repo activity, and unfunded commitments.

Formula

SLR = Tier 1 Capital / Total Leverage Exposure

Result is typically expressed as a percentage.

The numerator is Tier 1 capital, the same figure used in the Tier 1 Capital Ratio and standard Tier 1 Leverage Ratio calculations. Tier 1 capital includes Common Equity Tier 1 (CET1) plus Additional Tier 1 instruments like qualifying preferred stock, minus regulatory deductions for goodwill and certain intangible assets.

The denominator, total leverage exposure, is what sets the SLR apart from other capital ratios. It starts with average total consolidated assets (the same figure used in the standard leverage ratio) and then adds several categories of off-balance-sheet exposure:

• The notional amount of credit derivatives sold, reduced by any purchased protection

• The potential future exposure of derivative contracts

• The credit equivalent amount of repo-style transactions

• Unconditionally cancellable commitments at a 10% conversion factor

• Non-cancellable unfunded commitments at varying conversion factors

Each off-balance-sheet category uses specific measurement rules to translate the exposure into a dollar amount that gets added to the denominator. The result is a significantly larger denominator than the standard leverage ratio uses, which is why the SLR always produces a lower ratio than the Tier 1 Leverage Ratio for the same bank.

Interpretation

The SLR captures leverage from activities that do not appear on the balance sheet, providing a fuller picture of how thinly a bank's capital is stretched across its total commitments. A bank can show adequate capital under the standard leverage ratio while carrying substantial additional exposure through derivatives, securities lending, and unfunded commitments. The SLR accounts for all of this.

The minimum SLR requirement is 3% for all applicable banking organizations. G-SIBs face significantly stricter standards under the enhanced SLR (eSLR) framework: a 2% buffer on top of the 3% minimum for a total of 5% at the holding company level, and a 6% requirement at the insured depository institution level.

When the SLR is the binding capital constraint for a bank (meaning it is the ratio closest to its minimum), that signals the bank's off-balance-sheet activities are consuming a disproportionate share of its capital capacity. This often occurs at banks with large derivatives dealing operations or extensive repo financing businesses. Analysts watch whether SLR or risk-based ratios serve as the binding constraint because it reveals where capital pressure actually originates.

Typical Range for Banks

The minimum is 3% for applicable organizations, with G-SIBs subject to a 5% requirement at the holding company level and 6% at the insured depository subsidiary level. In practice, large U.S. banks typically maintain SLR between 5% and 7%, with most G-SIBs operating with roughly 50 to 150 basis points of buffer above their applicable minimum.

The SLR is always lower than the standard Tier 1 Leverage Ratio for the same bank because the denominator is larger. For banks with substantial derivatives and repo businesses, the gap between the two ratios can be significant. A bank showing a 9% Tier 1 Leverage Ratio might report an SLR of 5.5%, with the difference reflecting several hundred billion dollars of off-balance-sheet exposure folded into the SLR denominator.

Banks operating near their SLR minimum often face pressure to pull back from capital-intensive market activities. SLR buffers tend to be thinner than buffers above risk-based capital minimums, making the SLR the first constraint that many large banks encounter during periods of balance sheet expansion.

Generally Favorable

SLR above 5% for large banks and above 6% for G-SIB insured depository subsidiaries indicates comfortable compliance with enhanced requirements. Banks operating in this range have room to grow their market-making, repo lending, and derivative activities without bumping into capital constraints.

SLR well above the applicable minimum provides operational flexibility that matters during periods of market stress. When volatility spikes and clients need liquidity, banks with ample SLR headroom can expand their balance sheets to intermediate in markets, while banks near their minimum may need to pull back precisely when that capacity is most needed.

A rising SLR trend over several quarters, driven by retained earnings growth or deliberate reduction in off-balance-sheet exposures, signals a bank building capital flexibility. This is especially positive when it occurs alongside stable or growing revenue from capital markets activities, since it means the bank is generating enough capital to support its businesses without constraint.

Potential Concern

SLR near the 3% minimum for applicable banks, or near 5% for G-SIBs, indicates tight capital constraints that directly affect the bank's ability to serve clients in capital markets. When the SLR is binding, banks face difficult choices about which activities to scale back, often starting with low-margin but balance-sheet-intensive businesses like Treasury clearing and repo financing.

A declining SLR trend is more concerning than a low but stable level. If the ratio is falling because off-balance-sheet exposures are growing faster than capital, the bank is expanding commitments that may eventually require pulling back. Rapid growth in derivative notionals or unfunded credit commitments without corresponding capital increases can compress the SLR quickly.

Banks with binding SLR constraints sometimes pass costs to clients through wider bid-ask spreads or reduced credit availability, which can erode competitive position over time if rivals have more SLR headroom. Investors should also watch for banks that manage SLR through quarter-end adjustments, temporarily reducing derivative positions or repo activity at reporting dates to present a higher ratio.

Important Considerations

• The SLR can constrain bank activities that are low-risk but balance-sheet-intensive, such as clearing Treasury securities, providing repo financing, or accepting client deposits for placement at the Federal Reserve. During periods of market stress, binding SLR constraints have been cited as a factor limiting bank intermediation capacity. This creates a policy tension: the SLR's safety benefits as a capital backstop must be weighed against its potential to reduce liquidity in critical markets when banks collectively pull back from intermediation.
• The Federal Reserve temporarily modified SLR calculations during 2020 to exclude U.S. Treasury securities and deposits at Federal Reserve Banks from the denominator, but this modification expired in 2021. The temporary change highlighted how the SLR can interact with monetary policy implementation. When the Fed dramatically expanded its balance sheet through quantitative easing, the resulting flood of reserves into the banking system increased banks' total leverage exposure and compressed their SLR, even though holding reserves at the Fed carries essentially zero credit risk.
• Unlike risk-based capital ratios, the SLR does not differentiate between holding U.S. Treasuries and holding leveraged loans. This flat treatment is the intentional design of a backstop measure, but it means the SLR can be particularly binding for banks with large, low-risk balance sheets. A bank holding $200 billion in government securities faces the same SLR denominator impact as if those assets were high-yield corporate loans.
• Only the largest banking organizations are subject to the SLR. Regional and community banks use the standard Tier 1 Leverage Ratio (or the Community Bank Leverage Ratio framework) and do not calculate total leverage exposure. Investors analyzing banks below the $250 billion asset threshold should focus on the Tier 1 Leverage Ratio instead.
• The SLR denominator calculation for derivative exposures follows specific netting and measurement rules that can differ from how those same positions are reported on the balance sheet. Banks with large derivative books under master netting agreements may show very different derivative exposure figures for SLR purposes than what appears in their balance sheet footnotes. This makes it difficult to independently reconstruct a bank's SLR from publicly available balance sheet data without detailed regulatory filings.

Related Metrics

• Tier 1 Leverage Ratio — The standard leverage ratio uses only on-balance-sheet average total assets in the denominator, while the SLR adds off-balance-sheet exposures for a more comprehensive measure.
• Tier 1 Capital Ratio — The Tier 1 Capital Ratio shares the same numerator but uses risk-weighted assets, providing a risk-sensitive complement to the non-risk-weighted SLR.
• CET1 Capital Ratio — CET1 measures the highest-quality capital component and is typically the binding capital constraint for most banks, working alongside the SLR as a separate binding constraint.
• Risk-Weighted Assets Density — RWA Density indicates the risk profile of the asset base; low RWA Density banks may find the SLR more binding than risk-based ratios because their assets are less penalized under risk weighting.
• Equity to Assets Ratio — Equity to Assets provides a simple leverage measure for all banks, while the SLR applies regulatory adjustments and includes off-balance-sheet exposures for the largest banks.

Bank-Specific Context

The SLR was introduced as part of post-crisis Basel III reforms to address a specific vulnerability exposed during 2007-2009: banks had accumulated enormous off-balance-sheet exposures through derivatives, structured investment vehicles, and unfunded commitments that were invisible to on-balance-sheet leverage measures. When markets seized, these off-balance-sheet positions generated real losses and funding demands that some banks lacked capital to absorb.

Why On-Balance-Sheet Measures Fell Short

Before the SLR, leverage ratios only counted assets sitting on the balance sheet. But a bank's total risk exposure often extended far beyond that. A derivatives dealer might show $500 billion in total assets but carry trillions in notional derivative exposure. An unfunded revolving credit facility creates no balance sheet entry until the borrower draws on it, yet the bank still bears the obligation to fund. The standard leverage ratio missed all of this exposure, allowing banks to appear well-capitalized while carrying leverage that only became visible under stress.

The Dual Constraint System

For the largest banks, the SLR operates alongside risk-based capital requirements as part of a dual constraint framework. Which requirement is binding depends on the bank's specific business mix. Banks with large, low-risk portfolios (heavy in government securities or agency mortgage-backed securities) tend to find the SLR more binding because these assets carry low risk weights but still count fully in total leverage exposure. Banks with riskier lending portfolios tend to find risk-based ratios more binding because their assets carry higher risk weights. This dual constraint forces banks to maintain adequate capital from both a leverage and a risk-sensitivity perspective.

Broader Market Implications

The SLR has implications beyond individual bank analysis. When SLR constraints become binding across the banking industry, banks collectively pull back from intermediation activities. This can reduce liquidity in Treasury markets, increase repo financing costs, and widen derivatives pricing. Regulators occasionally face tension between the safety benefits of the SLR and its potential to impair market functioning during periods of stress, as was evident during the 2020 Treasury market disruptions.

Metric Connections

The SLR shares its Tier 1 capital numerator with the Tier 1 Capital Ratio and the standard Tier 1 Leverage Ratio. Any change to Tier 1 capital from retained earnings, capital raises, or regulatory deductions moves all three ratios in the same direction.

The ratios diverge through their denominators. The Tier 1 Capital Ratio uses risk-weighted assets, the standard leverage ratio uses average total assets, and the SLR uses total leverage exposure. For a bank with significant off-balance-sheet activities, these three denominators can differ substantially. A large bank might have $800 billion in risk-weighted assets, $1.2 trillion in average total assets, and $1.8 trillion in total leverage exposure, producing three meaningfully different ratios from the same Tier 1 capital base.

The gap between the SLR and the standard leverage ratio reveals the magnitude of a bank's off-balance-sheet footprint. If a bank's SLR is 5.5% and its Tier 1 Leverage Ratio is 8%, that tells you total leverage exposure is roughly 45% larger than on-balance-sheet assets. Tracking this gap over time shows whether off-balance-sheet activities are growing relative to the traditional balance sheet.

Risk-Weighted Assets (RWA) Density connects to the SLR indirectly. Banks with low RWA Density (holding lots of low-risk-weight assets) tend to find the SLR more binding than risk-based ratios. Banks with high RWA Density (concentrated in commercial lending) more often find risk-based ratios as the binding constraint.

Common Pitfalls

Applying the SLR to Banks That Are Not Subject to It

The most basic error is using SLR analysis for banks that do not calculate it. Only banking organizations with $250 billion or more in total consolidated assets, or $10 billion or more in on-balance-sheet foreign exposures, are required to calculate and disclose the SLR. Regional and community banks use the standard Tier 1 Leverage Ratio (or the CBLR framework) and do not report total leverage exposure figures. Searching for SLR data on a $30 billion regional bank will yield nothing because the metric does not apply.

Comparing SLR Without Accounting for Business Mix

Comparing SLR figures across banks without accounting for differences in off-balance-sheet activity intensity can be misleading. A bank with a large derivatives dealing operation will have a much larger total leverage exposure relative to its on-balance-sheet assets than a traditional lending-focused bank. The derivatives-heavy bank might show a 5.5% SLR while a lending-focused bank of similar size reports 6.5%, but that does not necessarily mean the lending bank is better capitalized. The difference reflects the composition of the denominator, not a deficiency in capital.

Confusing SLR with the Standard Leverage Ratio

Investors sometimes conflate the SLR with the standard Tier 1 Leverage Ratio. These are distinct regulatory metrics with different denominators, different applicability, and different minimum requirements. The standard leverage ratio minimum is 4% (5% for "well-capitalized" status), while the SLR minimum is 3% (5% for G-SIB holding companies). A bank reporting 5% on both metrics would be in very different regulatory positions relative to each ratio's respective minimum.

Across Bank Types

Global Systemically Important Banks (G-SIBs)

G-SIBs face the most stringent SLR requirements: at least 5% at the holding company level (3% minimum plus 2% buffer) and 6% at the insured depository institution subsidiary level. G-SIBs typically maintain SLR between 5% and 7%, with buffers that fluctuate based on derivative market conditions, client activity levels, and capital management actions.

Because G-SIBs operate the largest derivatives dealing businesses and securities financing operations, their total leverage exposure is often 40% to 60% larger than their on-balance-sheet assets. This frequently makes the SLR the binding capital constraint for these institutions, meaning it is the ratio with the least headroom above the regulatory minimum.

Large Non-G-SIB Banks

Large banking organizations above the $250 billion asset threshold that are not designated as G-SIBs face the 3% SLR minimum without the enhanced buffer. These banks generally maintain SLR between 5% and 7%, with more comfortable buffers above their minimum than G-SIBs typically carry. Their off-balance-sheet exposures tend to be smaller relative to total assets, since they usually have less derivatives dealing and securities financing activity.

Banks Below SLR Thresholds

Regional and community banks below the $250 billion asset threshold are not subject to the SLR. These banks use the standard Tier 1 Leverage Ratio (4% minimum, 5% for "well-capitalized" status) or, for qualifying community banks, the Community Bank Leverage Ratio framework with its 9% threshold. The SLR does not factor into their regulatory capital analysis, and investors evaluating these banks should focus on the Tier 1 Leverage Ratio and risk-based capital ratios instead.

What Drives This Metric

Numerator: Tier 1 Capital

Changes in Tier 1 capital affect the SLR numerator identically to other Tier 1-based ratios. Retained earnings (net income minus dividends) are the primary organic source of Tier 1 capital growth. Preferred stock issuances add Additional Tier 1 capital, while redemptions reduce it. Regulatory deductions for goodwill, certain intangible assets, and changes flowing through Accumulated Other Comprehensive Income (AOCI) also affect the numerator.

Denominator: On-Balance-Sheet Assets

The on-balance-sheet portion of total leverage exposure moves with overall asset growth, identical to the standard leverage ratio. Loan growth, securities purchases, and cash accumulation all increase this component. Asset sales, loan payoffs, and securities maturities reduce it.

Denominator: Off-Balance-Sheet Exposures

This is where the SLR's drivers diverge from the standard leverage ratio. Expanding a derivatives book increases total leverage exposure through both current notional exposure and potential future exposure calculations. Growing unfunded lending commitments (revolving credit facilities, standby letters of credit) adds to the denominator at conversion factors specified by regulators. Increased repo-style transaction activity raises the securities financing component.

Banks can improve their SLR through several paths, each with trade-offs:

• Raising Tier 1 capital through retained earnings or issuance, which may dilute existing shareholders

• Reducing on-balance-sheet assets, which limits lending and investment capacity

• Reducing off-balance-sheet exposures by shrinking derivatives books or unfunded commitments, which can sacrifice trading revenue and client relationships

• Restructuring derivative positions to lower their notional footprint through compression or novation

In practice, most banks manage their SLR through a combination of capital accumulation and selective trimming of the most capital-intensive activities.

Related Valuation Methods

• Peer Comparison Analysis — SLR is a standard comparison point when evaluating the largest banks against each other, since it captures off-balance-sheet leverage that the standard leverage ratio misses and provides a more complete picture of relative capitalization.
• Excess Capital Return Model — The excess capital return model uses regulatory capital ratios including the SLR to determine how much capital a bank holds above requirements, then estimates the value of returning that excess to shareholders.

Frequently Asked Questions

What is the difference between CET1, Tier 1, and Total Capital ratios?

These three ratios form a hierarchy of capital quality, each adding progressively lower-quality capital instruments to the numerator while using the same risk-weighted asset denominator. Read more →

What happens if a bank falls below minimum capital requirements?

Federal banking regulators enforce a prompt corrective action framework that imposes increasingly severe restrictions as capital ratios decline below defined thresholds. Read more →

How do I calculate the supplementary leverage ratio (SLR)?

The SLR calculation divides Tier 1 capital by total leverage exposure. The key complexity is in the denominator, which adds off-balance-sheet items like derivative exposures, repo transactions, and unfunded commitments to on-balance-sheet assets. Read more →

How do I calculate the Tier 1 leverage ratio?

The standard leverage ratio divides Tier 1 capital by average total on-balance-sheet assets. Comparing it with the SLR shows how much additional exposure a bank carries through off-balance-sheet activities. Read more →

Where to Find This Data

SLR data for applicable banking organizations is disclosed in quarterly earnings releases and 10-Q/10-K filings, typically in a capital adequacy summary table alongside CET1, Tier 1 Capital, Total Capital, and Tier 1 Leverage Ratios. The SLR is usually presented with its components broken out, showing Tier 1 capital (numerator) and total leverage exposure (denominator).

FR Y-9C filings contain detailed SLR calculations for bank holding companies, including the breakdown of total leverage exposure into its on-balance-sheet and off-balance-sheet components. These filings are publicly available through the Federal Reserve's National Information Center.

For G-SIBs, Basel III Pillar 3 disclosures provide additional detail on the composition of total leverage exposure, separating derivative exposures, securities financing transactions, and off-balance-sheet items. The Federal Reserve also publishes SLR data for the largest bank holding companies as part of its supervisory stress testing disclosures.