What it means
Banks fund themselves mostly with other people's money, so the slice funded by shareholders is what stands between a bad year and a failure. The capital reserve ratio puts a number on that slice, comparing capital and retained reserves against the deposit base the institution supports.
It is easy to muddle this ratio with the cash reserve requirement, which is a completely different idea. Cash reserves are liquid funds a bank must keep with the central bank to meet withdrawals, whereas capital reserves are a solvency measure showing who ultimately bears losses.
The ratio matters commercially because it caps growth. If a bank must keep capital at 6% of deposits, every $1 of extra capital allows roughly $16.67 of extra deposits, so a bank running near the floor cannot expand its lending book until it earns or raises more capital.
Outside banking, the phrase carries a second and simpler meaning. A capital reserve on a company balance sheet is a reserve created from non-trading gains, such as a profit on selling a property or a share premium, which company law usually stops the business paying out as a dividend.
Analysts read the ratio alongside the quality of what sits behind it. A comfortable percentage built on retained profits is far more reassuring than the same percentage propped up by revaluation gains that could reverse in the next downturn.
In practice
Real-world examples.
Example
A building society reports a capital reserve ratio of 11% and uses it in its annual report to reassure savers that it is more conservatively funded than the sector average. Its marketing team quotes the figure alongside its credit rating in deposit advertising.
Example
A credit union approaching its regulatory floor pauses a planned branch expansion and retains its full surplus for two years instead of distributing it to members. The retained surplus rebuilds capital and restores lending headroom.
Example
A bank's board reviews the ratio quarterly and finds it has slipped from 9% to 7.5% purely because a successful deposit campaign brought in new savings faster than profits could keep pace. Growth in deposits, not losses, turns out to be the pressure on the ratio.
Think of it
“Capital reserve ratio shows how much cushion you're keeping against capital for safety.
Formula
Calculation
Capital reserve ratio = capital and reserves / total deposits x 100
A regional bank holds $72,000,000 of capital and reserves and looks after $900,000,000 of customer deposits. Its capital reserve ratio is $72,000,000 / $900,000,000 = 0.08, or 8%.
Suppose the supervisor sets a minimum of 6%. With $72,000,000 of capital, the largest deposit base the bank could support is $72,000,000 / 0.06 = $1,200,000,000, so it has headroom of $1,200,000,000 - $900,000,000 = $300,000,000 of deposit growth before it must raise more capital.
Now assume the bank writes off $18,000,000 of bad loans. Capital falls to $72,000,000 - $18,000,000 = $54,000,000, and against the same $900,000,000 of deposits the ratio drops to 6%, exactly on the regulatory floor and with no room left for growth.Case study
Seen in the real world.
The following is a fictional, illustrative scenario. Kestrel Mutual Savings, an invented regional deposit taker, spent three years promoting a market leading savings rate and grew its deposit book by roughly 40%. Profits grew far more slowly, since the attractive rate squeezed its margin.
Its capital reserve ratio drifted from a comfortable 10% down to 6.4%, uncomfortably close to the 6% floor in this illustrative example, and the supervisor asked for a remediation plan. The fictional board had to withdraw the headline savings rate, cut its distribution to members and sell a small commercial loan portfolio to shrink the balance sheet.
The lesson drawn by Kestrel's imaginary directors was that rapid deposit growth consumes capital just as surely as losses do, because the denominator of the ratio grows while the numerator stands still.
Watch out
Common mistakes.
- Confusing the capital reserve ratio with the cash reserve requirement, which measures liquidity held at the central bank rather than the ability to absorb losses.
- Reading a high ratio as automatically good, when an unusually high figure can also mean the institution is failing to put its capital to work.
- Assuming the ratio only falls when losses occur, when fast deposit growth can push it down just as effectively.
Questions
People also ask.
What counts as capital for this ratio?
Ordinary share capital, retained profits and disclosed reserves, with regulators applying detailed rules on which other instruments qualify.
Why do regulators set a floor at all?
Because banks fund themselves largely with customer money, and without a minimum cushion the cost of failure falls on depositors and ultimately on taxpayers.
Does a non-bank company have a capital reserve ratio?
Not in the regulatory sense, though the term capital reserve still appears on company balance sheets to describe gains that cannot be paid out as dividends.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%