Skip to content
// WORKED EXAMPLETHE ARITHMETIC A DECISION RESTS ON

Loan to Security Ratio: a Worked Example

Count each asset at what the bank would lend on it.

BY MICHAEL SHANG · SIXTEEN YEARS IN COMMERCIAL BANKING · UPDATED

// THE SHORT ANSWER

A loan to security ratio is the test a bank runs to see whether everything it is owed is covered by everything it holds, once each asset has been marked down to the amount the bank will lend against it. Under 100%, the security covers the exposure on the bank's own reckoning; over 100%, part of the lending is in effect unsecured, and the credit paper has to explain why that is acceptable. The ratio is read on facility limits and contingent exposures, not only on balances drawn, and it moves with every valuation, every new facility and every asset sold.

BASIS  Practitioner judgment from sixteen years in commercial banking, set out in How Bankers Think (Highbank Press, 2026). Every borrower on this site is a composite constructed for teaching, not a client. The market is mid-market commercial lending as practised in New Zealand and Australia; where a convention differs elsewhere, the page says so.

// MAKE THE CALL

Issue 03 — Kauri Dairy Holdings. The patriarch is retiring. The bank hears about the succession plan from the accountant first. Your call first, then the senior banker's.

Read the file →

// 01 — WHAT THE RATIO ASKS

A business loan is meant to be repaid from the business's cash. The security is the second way out: what the bank recovers if the cash stops. Read that way, a valuation is not what an asset is worth to its owner but what the bank would collect by selling it, after a default, without the business that made it useful. A freehold factory loses some of its value in that sale. A specialised machine can lose most of it, and some assets have no buyer at all.

The ratio puts the whole relationship on one line. Every facility the bank has given the customer goes on top: term loans, the overdraft, bonds issued on its behalf, the risk on its hedging lines. Every asset the bank holds goes underneath, each at its lending value. The result says how much of the exposure the security answers for, on the assumptions the bank has chosen. Banks name it differently, as security cover or a security shortfall, but the arithmetic is the same.

// 02 — HOW THE RATIO IS CALCULATED

Lending value of an asset = valuation × lending ratio − debt ranking ahead
Total lending value = sum of the lending values
Loan to security ratio = total exposure ÷ total lending value
Security shortfall = total exposure − total lending value, if positive

Four choices decide the answer. The first is the exposure. A bank commonly counts facility limits rather than balances, because a customer in trouble draws its overdraft to the limit, and counts contingent lines too: a performance bond at its face amount, a foreign-exchange line at a credit equivalent for what the bank could lose on it. The second is the valuation: which valuer, what date, and whether it is market value or a forced-sale value. The third is the lending ratio for each class of asset, set in the bank's own credit policy and differing from one bank to another by asset type, location and how specialised the asset is. The fourth is what ranks ahead: another lender's mortgage, an equipment financier's purchase money security interest in New Zealand or Australia (in the UK such equipment is more often on hire purchase, and not the borrower's to charge), or the preferential claims that rank ahead of a general security over receivables and stock in insolvency.

// 03 — THE EXAMPLE

A timber processor, constructed for this page like every figure in it, has a US$2.4m term loan, an overdraft with a limit of US$0.6m of which US$0.2m is drawn, and US$0.15m of performance bonds issued by the bank. The bank holds a first mortgage over the mill site and a general security agreement over the company. The lending ratios below are the example's, not a market norm or any bank's policy.

Mill site, valued 3.0 × 65% = 1.95
Sawmill plant, valued 1.4 × 35% = 0.49
Eligible receivables 0.8 × 50% = 0.40
Log and timber stock 0.6 × 20% = 0.12
Total lending value = 2.96
On balances drawn: (2.4 + 0.2 + 0.15) ÷ 2.96 = 2.75 ÷ 2.96 = 93%
On limits: (2.4 + 0.6 + 0.15) ÷ 2.96 = 3.15 ÷ 2.96 = 106%

On balances the processor is covered. On limits it is US$0.19m short, which is the reading many banks use, because the undrawn overdraft is the part most likely to be drawn when trading gets hard. Then the file shows that a new saw line, US$0.9m of the plant valuation, was bought on an equipment loan from another financier, which has US$0.3m outstanding and ranks first on that asset, as a purchase money security interest would.

Plant, after the prior charge: 0.49 − 0.30 = 0.19
Total lending value: 2.96 − 0.30 = 2.66
On limits: 3.15 ÷ 2.66 = 118%
Shortfall: 3.15 − 2.66 = 0.49

Nothing in the business has changed between the two readings. What has changed is that the bank has found a creditor ahead of it. Its credit officer now has to decide whether US$0.49m of effectively unsecured lending is acceptable for this processor, on the strength of its cash flow, and on what terms.

// 04 — HOW IT DIFFERS FROM LOAN TO VALUE

A loan to value ratio measures a single debt against the market value of the property behind it. It suits a residential mortgage or a property investment loan, where one asset secures one debt. On the example, the term loan against the mill site alone is 2.4 ÷ 3.0, or 80%, a figure that says nothing about the overdraft, the bonds, the plant or the prior charge. The loan to security ratio takes the relationship instead: every facility on top, every asset underneath, each at its own ratio. A business can have a comfortable LVR on its main property and a shortfall across the relationship, or the reverse.

The name also turns up in Australian margin lending, where at least one lender calls the loan divided by the market value of the share portfolio its loan to security ratio, and others call the same figure an LVR. It is compared with a ceiling built from each holding's lending value. The two readings agree: a margin loan is inside its ceiling exactly when the loan is no larger than the portfolio's lending value.

DEFINED IN ONE PARAGRAPH → · LOAN TO VALUE RATIO → · WHAT YOUR BANK HOLDS AS SECURITY →

// 05 — WHERE IT DECIDES A FILE

A shortfall does not by itself decline a loan, but it changes the file. The credit paper names it and explains what covers it: cash flow strong enough to carry unsecured lending, a guarantee backed by the owner's own property, or a plan to reduce the limits. A larger shortfall may need a more senior approver, a higher margin or a policy exception. The ratio is recalculated at each annual review, when valuations are refreshed and new facilities added, and whenever the customer asks for a partial release to sell an asset.

The ratio also has a limit of its own. It is a liquidation reading, built on prices the bank expects in a sale it hopes not to run, and it says nothing about whether the business can pay. A loan fully covered by security can still be a bad loan, and the lending values are only as good as the valuation date and the assumptions behind each ratio.

FORCED-SALE VALUE → · THE PANEL VALUER → · HOW BANKS APPROVE BUSINESS LOANS →

// SOURCES

The documents the statements on this page rest on. Each was opened and checked when cited.

  1. HM Revenue & Customs, International Manual INTM518010, Thin capitalisation: lending against asset values, lending against assets in general — Lenders discount pledged assets because sale proceeds after default are uncertain, discount plant and machinery heavily and land and buildings less, and rarely lend the full current value of an asset — sections 01 and 02.

// QUESTIONS PEOPLE ASK

What is the difference between LSR and LVR?
A loan to value ratio compares one loan with the market value of one property. A loan to security ratio sets everything the customer owes the bank, usually counted at facility limits, against the security it holds, each asset counted only at its own lending value. LVR is the test for a single property loan; LSR is the test for a business relationship with several facilities and several kinds of security.
What is a good loan to security ratio?
There is no single right level. A ratio under 100% means the security covers the exposure on the bank's own lending values, and a ratio over 100% means part of the lending relies on the business's cash flow alone. Banks set their own lending values, and a lender can be content with a shortfall for a strongly cash-generative business and uneasy with full cover for a weak one. The reasons behind the number matter more than the number.
Does a personal guarantee count as security in the ratio?
Practice varies. Many banks give an unsupported guarantee no lending value, because what it is worth depends on the guarantor's finances when it is called. A guarantee supported by a mortgage over the guarantor's property is different: the property is valued and counted like any other asset, up to the guarantee's limit. Either way, a guarantee can matter to the decision without appearing in the ratio.
What happens if my loan to security ratio goes over 100%?
Usually nothing immediate in a business facility, unless the agreement contains a security value covenant that the new figure breaches. At the next review the bank may ask for more security, a lower limit, a higher margin or a plan to reduce the debt. In an Australian margin loan the effect is faster: once the loan rises past its ceiling, and past any buffer the lender allows, a margin call follows, to be met by repayment, more securities or a sale.

THE IN-TRAY · ONE MINUTE

Make the call on one file.

A short file on the ground this page covers. Every option opens with how far it sits from a senior banker’s read.

THE FIRST QUESTION · THE LOAN · PROTECTION

A term sheet offers three protections: a negative pledge, a quarterly leverage covenant, and monthly management accounts.

Which is likely to show deterioration first?

1 FILES · PICK A CALL ON ANY OF THEM

7 MORE ON THE LOAN · PROTECTION →WHERE DO YOU READ FROM? THE PLACEMENT →