What it means
A lender who takes second position on a property only gets paid after the first lender is made whole, so the total borrowing against the asset matters far more to them than their own slice does. The combined loan-to-value ratio captures that total in one number, expressed as a percentage of value.
A 90% ratio means only 10% of the property's value stands between the lenders and a loss. The ratio drives approval decisions, pricing and insurance requirements.
Conventional residential lending often caps the first mortgage at 80% of value, while home equity products may take the combined figure to 85% or 90% for strong borrowers, with rates rising as the number climbs. Above certain thresholds a borrower may be required to pay mortgage insurance, or the application may simply be declined.
Business owners meet the same ratio when they borrow against commercial premises or against their own home to fund a company. A second charge behind an existing mortgage is cheap to arrange compared with unsecured borrowing, but only if the combined figure stays inside the lender's appetite.
Working out the number in advance saves a wasted application. Two details trip people up.
Most lenders use the lower of appraised value and purchase price for a recent transaction, and most count the full credit limit of a home equity line rather than the drawn balance, on the grounds that the borrower could draw the rest tomorrow. Some documents label that stricter version the high combined loan-to-value ratio, and it is almost always the number underwriting relies on.
The ratio is also a moving target because property values move. A borrower who was comfortable at 78% when values were rising can find themselves at 92% after a market correction, which affects refinancing options even though the loans themselves have not changed.
That is why lenders re-check value at every material event rather than trusting the original appraisal.
In practice
Real-world examples.
Example
A homeowner with a $400,000 property and a $260,000 mortgage applies for a $60,000 line of credit for a kitchen refit. The combined figure comes to $320,000 against $400,000, or 80%, which sits comfortably inside the lender's 85% ceiling and the application proceeds at standard pricing.
Example
The owner of a small dental practice wants a second charge over the clinic building to fund new equipment. The building is valued at $1,200,000 with a $700,000 first mortgage outstanding, so a $200,000 second charge would give a combined ratio of 75% and the lender approves it at a modest premium over the first mortgage rate.
Example
A buyer structures a purchase with an 80% first mortgage, a 10% second mortgage and a 10% deposit to avoid mortgage insurance. The combined ratio is 90%, so the second mortgage carries a noticeably higher rate to compensate the lender for sitting behind the first.
Formula
Calculation
CLTV = (Total of all loans secured by the property / Appraised value of the property) x 100
A house is appraised at $500,000. The owner has a first mortgage with a balance of $320,000 and a home equity line with a limit of $60,000 that is fully drawn.
Total secured borrowing = $320,000 + $60,000 = $380,000
CLTV = $380,000 / $500,000 = 0.76, or 76%
For comparison, the loan-to-value ratio on the first mortgage alone is $320,000 / $500,000 = 64%. A lender working to an 85% ceiling would still allow further borrowing of $425,000 - $380,000 = $45,000 against this property.Case study
Seen in the real world.
Lakeside Cabinetry is an invented joinery business used for illustration. Its owner needed $80,000 to buy a computer-controlled cutting machine and assumed the family home, valued at $600,000 with a $390,000 mortgage, offered plenty of room. On the face of it the first mortgage alone was 65% of value.
The lender's underwriter added an existing home equity line with a $50,000 limit, of which only $12,000 was drawn. Counting the full limit, total secured borrowing was $390,000 + $50,000 + $80,000 = $520,000, a combined ratio of 87% against the 85% ceiling. The application failed by a margin the owner had not seen coming.
In this fictional resolution the owner cancelled the unused portion of the equity line, reducing its limit to $12,000. Total borrowing fell to $482,000, a combined ratio of 80%, and the machine was financed at the rate originally quoted.
Watch out
Common mistakes.
- Counting only the drawn balance on a home equity line. Most underwriting uses the full available limit, so an unused facility can quietly block a new application.
- Using an estimate from a property website as the value. Lenders work from a formal appraisal or the purchase price, whichever is lower on a recent sale, and online estimates routinely sit above both.
- Ignoring charges that are not mortgages. Tax liens, contractor liens and judgement charges all sit against the property and are counted in the total, sometimes ahead of the mortgage lender.
Questions
People also ask.
Is a higher or lower combined loan-to-value ratio better?
Lower is better for the borrower, because it means more equity in the property, wider lender choice and cheaper pricing, while a high ratio narrows the options and raises the rate.
How does the combined ratio differ from the loan-to-value ratio?
The loan-to-value ratio covers a single loan, usually the first mortgage, whereas the combined version adds up every loan secured on the same property before dividing by value.
Does a falling property market change the ratio?
Yes, because the denominator falls even though the loan balances do not, so a borrower can drift above a lender's threshold without borrowing another cent.
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