Calculator

Second mortgage borrowing capacity

Quick answer
A second mortgage borrowing capacity calculator shows how much additional debt a property can support behind an existing first mortgage at a combined LVR you choose. On a $1,000,000 property with a $500,000 existing first mortgage, an illustrative 80% combined LVR leaves $300,000 of capacity before costs. The 80% is an example input, not an Archer policy limit. Enter your property value, first mortgage balance and combined LVR below.
Inputs
Illustrative additional debt capacity before costs
$400,000
At a 80% combined LVR.
Existing first LVR
53.3%
First balance / value
Total debt at this combined LVR
$1,200,000
Value x combined LVR
Combined LVR with the additional debt
80.0%
(First + additional) / value
Assumptions
  • Combined LVR is the first mortgage balance plus the additional debt, divided by the property value.
  • The property value is your estimate. A lender relies on its own valuation.
  • The combined LVR is the figure you enter. It is illustrative, not an Archer policy limit.

Illustrative estimate only, based on the inputs and assumptions shown. This is not a quote, credit approval or commitment to lend. Actual interest, fees, repayments and terms may differ. Costs not included are listed below.

Costs not included
  • Lender fees, including establishment and any other fees
  • Valuation, legal and settlement costs
  • Government charges and registration fees
  • Default interest, default fees and enforcement costs
  • Interest capitalised into the loan, which reduces the capacity shown
Run this as a live scenario →

How private credit sizes a second mortgage

The combined position is what matters. Lender adds the existing first balance and the proposed second, divides by the property value, and tests it against its own limit for the security type. Limits differ by lender, product and security.

Why borrowers use a second instead of refinancing

Two patterns. The existing first carries terms worth keeping, a fixed rate locked below variable, an offset facility with a material balance, a long-dated commercial facility on terms the borrower would not get today. Or full refinance would fail current bank serviceability rules even though the equity position is strong. Both point to a second mortgage behind the first. Detail on second mortgage loans.

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