Bank leverage ratio: formula and interpretation

The US Tier 1 bank leverage ratio is approved Tier 1 capital divided by average total consolidated assets after applicable deductions. It compares capital with a defined asset base without using the risk-weighted asset denominator of a risk-based capital ratio. A supplementary leverage ratio uses a separate total leverage exposure measure, so the ratio's full name matters.

Choose the denominator before using the formula

Tier 1 leverage ratio = Approved Tier 1 capital / Approved adjusted average total consolidated assets

Adjusted average total consolidated assets = Average total consolidated assets minus applicable reported deductions

The Federal Reserve's capital ratio rule specifies the ordinary leverage calculation and separately defines the supplementary leverage calculation. Use the denominator supplied by the bank's approved reporting process rather than deciding which accounting balances to deduct yourself.

The key distinction is the exposure base. A Tier 1 risk-based capital ratio uses risk-weighted assets. The leverage calculation below uses adjusted average assets. A bank can therefore show different movements in the two ratios even when both share the same approved Tier 1 numerator.

This is different from an assets-to-equity multiple, despite the shared word leverage. The Office of Financial Research's bank measure definitions distinguish an accounting leverage multiple from the reported Tier 1 leverage ratio. Keep the direction of each fraction visible in management reports.

The rows to request from the workbook

Start with one row per reporting entity and quarter. Bring approved Tier 1 capital, average total consolidated assets, the applicable deduction total and the final adjusted denominator. Carry the period, currency, units, source schedule and approval version with those figures.

If your file also contains supplementary leverage exposure, keep it in a separate labeled column. Do not combine it with the ordinary adjusted-asset denominator. If the file contains only period-end assets, request the approved average rather than treating the closing balance as an average.

The capital-reporting owner should confirm that the numerator and denominator belong to the same reporting perimeter. A holding-company numerator over a bank subsidiary's asset base can produce a mathematically correct percentage that answers no valid reporting question.

A US bank example, step by step

An illustrative US commercial bank provides the following approved amounts. Its reporting team has already determined the averaging basis and applicable deductions. All amounts are USD, and both quarters cover the same reporting entity.

Show ratios to two decimal places and retain full precision in the calculation. With capital in B2, average assets in C2 and deductions in D2, calculate adjusted average assets in E2:

=C2-D2

Then calculate the leverage ratio in F2:

=B2/E2

Format F2 as a percentage and fill both formulas down. September's adjusted denominator is $8,600,000,000 minus $200,000,000, giving $8,400,000,000. Dividing $630,000,000 by that amount gives 7.50%.

Capital increases by $30,000,000, but adjusted average assets increase by $600,000,000. The ratio falls by 0.19 percentage points, calculated from the unrounded closing ratio minus the unrounded opening ratio. That movement requires an explanation of both balances, rather than a statement that capital has fallen.

Change one input to explain the movement

Hold June's adjusted asset base fixed and replace only capital. The resulting variation separates the numerator effect before the denominator changes.

All bridge movements are calculated before rounding. The rounded movements may not add to the rounded net change, so retain the underlying values in the workbook. The bridge states its order: capital first, denominator second. Changing the order would change the allocation between steps, while leaving the net movement unchanged.

The middle row shows that capital growth by itself would have raised the ratio. The reported average asset increase offsets that benefit. Ask the reporting owner for the documented asset movement, averaging detail and any changes in deductions before attributing the decline to business activity.

Keep supplementary leverage separate

Suppose the same bank separately supplies approved total leverage exposure of $10,500,000,000 for September. That figure is an additional approved input; it is not derived from the ordinary leverage table.

The supplementary result is $630,000,000 divided by $10,500,000,000. The different percentage comes from a different denominator, not a change in capital. Whether that measure applies to a particular institution is a separate reporting determination for its responsible team.

Checks that prove the result

First, tie average assets and deductions to their approved schedule. Their subtraction must recover the approved adjusted denominator. Then tie Tier 1 capital to the corresponding reported capital total for the same entity and quarter.

The final identity uses the unrounded quotient: (630,000,000/8,400,000,000)*8,400,000,000 = 630,000,000. It must recover the numerator. Compare the calculated percentage with the reported ratio using the report's stated rounding convention.

Also inspect the imported display format. The FFIEC's Call Report download guidance flags certain capital ratios displayed as decimal fractions. A decimal fraction and its percentage display represent the same underlying value; they should not be treated as different observations.

Where it goes wrong

• Using closing assets instead of the approved average. Quarter-end growth or contraction can make the substitution materially misleading.
• Reusing risk-weighted assets. That creates a risk-based capital calculation, not this leverage measure.
• Subtracting deductions again. If the supplied denominator is already adjusted, do not deduct the same amount twice.
• Mixing ordinary and supplementary exposure bases. Preserve the ratio name and denominator definition together through every comparison.
• Treating the example as a regulatory verdict. A calculated ratio does not establish applicable requirements or certify compliance.

The total capital adequacy ratio provides another capital perspective. For earnings sensitivity rather than regulatory capital, use bank operating leverage. For debt against earnings, the gross leverage ratio addresses a separate calculation.

Compare your leverage workbook in Covirage

Bring a file or Google Sheet with approved Tier 1 capital, adjusted average assets and any separately reported leverage exposure. Covirage maps the columns; its tools compute and check the supplied ratios and period movements, while the external AI model explains the results with every figure traced to its rows. Create a free Covirage account in about a minute, then set up your business and bring a sample of your own data.

See Covirage for commercial banking for the broader reporting context.