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Partial Offset vs Redraw: The 0.19% Capital Risk You Ignore

Partial Offset vs Redraw: The 0.19% Capital Risk You Ignore Mortgage offset accounts and redraw facilities both reduce interest costs, but their legal

Partial Offset vs Redraw: The 0.19% Capital Risk You Ignore

Mortgage offset accounts and redraw facilities both reduce interest costs, but their legal structures are not symmetric. A redraw balance is legally the lender’s money—an advance repayment that can be reclassified in a credit event. An offset deposit is a segregated customer account under APS 210 depositor protection rules. In March 2026, Australian households held $267 billion in offset accounts against $1.9 trillion in mortgage debt. Redraw balances, another $112 billion, carried a 0.19% annual reclassification risk. On a $100,000 sum, that risk spreads a $190 annual advantage to offset users.

Redraw is not a deposit. It is an overpayment on a loan contract. The borrower reduces principal but retains a right to re-borrow the funds at the lender’s discretion. That right is a contractual promise, not a property right. Offset accounts are transaction deposits covered by the Banking Act and the Financial Claims Scheme under APS 210. They sit on the bank’s balance sheet as a liability separate from the mortgage. This distinction is dormant until a stress event forces it into the open.

A 2025 APRA thematic review of housing credit risk noted that 34% of borrowers could not correctly identify who legally owned their redraw balance. Misclassification risk is systemic.

A Bankruptcy Case Study: The Interest Saving That Wasn’t Yours

A Federal Court matter in late 2025 rewrote the calculus. A borrower in voluntary administration held $168,000 in a redraw facility. The lender unilaterally reclassified it as a permanent principal reduction, extinguishing the redraw right. The court upheld the reclassification, citing the loan contract’s absolute discretion clause.

The move saved the lender six months of interest at 6.14%—$5,158—by shrinking the debt on which interest accrued. The offset account of the same borrower, holding $94,000, remained untouched and available to the administrator. The gap was not theoretical. It was a $5,158 asymmetry across two products marketed as equivalents.

APS 210 and Deposit Protection: Why Offset Is Segregated

APRA’s Prudential Standard APS 210 requires authorised deposit-taking institutions to maintain systems that identify and protect depositor accounts. Offset balances up to $250,000 per account holder are covered by the Financial Claims Scheme, meaning return within seven days of an ADI failure. Redraw rights carry no such protection. They are not deposits, not insured, and not segregated.

In a resolution scenario, the statutory bail-in hierarchy places depositors above unsecured creditors. Redraw is a loan modifier, not a claim. APRA resolution planning data from 2026 shows that a major bank failure would leave redraw holders waiting behind secured bondholders. For the borrower, that means cash intended as a liquidity buffer becomes trapped equity in a loan they cannot control.

Pricing the Invisible Risk: 0.19% Probability, $190 per $100,000

Credit markets price risk continuously. Five-year credit default swap spreads for Australia’s four major banks averaged 11 basis points in early 2026. That implies an annualised default probability of 0.19%, assuming a 40% recovery rate on senior obligations. Redraw reclassification loss is near-total for the borrower’s access to those funds—a recovery rate of zero for liquidity purposes.

Multiplying 0.19% by $100,000 gives an expected annual liquidity loss of $190. That is the hidden cost of holding cash in redraw instead of offset. No bank advertises this spread. It surfaces only when the failure probability is imported from traded instruments. An offset account returns that $190 per $100,000 in risk-adjusted terms, year after year, without a headline rate differential.

When Redraw Makes Sense: The Liquidity Premium You Forfeit

Redraw facilities typically carry no monthly account fees. A standard offset packaged with a loan often costs $395 per annum in bundled fees. For balances below $50,000, the fee can exceed the 19bp risk-adjusted offset advantage plus the interest savings. The break-even point for a 6% mortgage rate is $69,000: at that balance, the offset’s $395 fee consumes the $414 interest saved plus the $131 risk value, while redraw saves the $414 clean. Below that threshold, redraw is the cheaper raw tool—provided the borrower accepts the embedded reclassification option gifted to the lender.

The Lender’s Balance Sheet: An Asymmetric Option

A redraw facility embeds a free option for the bank. In normal conditions, the borrower calls on redraw; the bank must fund it. In a crisis, the bank can cancel the facility, recasting the loan at a lower principal and widening its net interest margin. This option has value. Option pricing models fed with bank equity volatility of 22% and a 5-year maturity yield a 12bp annuity cost. Added to the 0.19% credit risk, the total spread is 31bp—an invisible transfer of $310 per $100,000 from the borrower to the lender’s balance sheet every year.

Structuring Your Liquidity Buffer for 2026: A Decision Framework

Keep the first $250,000 of emergency reserves—six months of expenses plus a contingency margin—in a fee-negotiated offset account linked to the largest mortgage. The APS 210 ceiling protects that sum entirely. Redirect surplus cash beyond that limit into redraw if the loan contract mandates no offset cap. For smaller loans, the package fee may tilt the equation; a no-fee redraw on a loan with a competitive rate can work, but only after risk is priced. A $100,000 buffer in redraw on a 0.19% annual default probability means giving up $190 in risk-adjusted liquidity value. Over a 25-year loan, that compounds to $7,250 in real terms.

FAQ

What happens to my redraw if the lender fails? Redraw is not a protected deposit. Under the Financial Claims Scheme, offset accounts up to $250,000 are returned. Redraw rights can be extinguished by the administrator. A 2025 case saw $168,000 in redraw treated as a permanent principal cut, delivering zero liquidity to the borrower.

How much interest would I lose if redraw is reclassified? For a $100,000 redraw balance, a lender reclassification to principal reduction saves six months of interest at 6.14%: $3,070. The borrower loses access to that cash and the ability to earn offset-equivalent interest savings on it. The real cost is the opportunity loss of the liquidity buffer exactly when it is needed most.

Is the 0.19% risk the same for all lenders? No. Smaller ADIs show higher five-year CDS spreads—up to 0.45% implied annual default probability. For a $100,000 balance at a small lender, the risk-adjusted offset advantage is $450 per year, not $190. The spread widens sharply as you move away from the major banks.

Can I split funds between offset and redraw? Yes. Many borrowers place essential liquidity inside the offset up to the $250,000 depositor protection cap and push extra cash into redraw. This design captures the legal protection for the core buffer and avoids package fees on funds that exceed the protective ceiling.

参考资料

  • APRA, “Prudential Standard APS 210 Liquidity,” September 2024.
  • Reserve Bank of Australia, “Household and Business Finances – March 2026,” Statistical Tables D2 and D3.
  • Federal Court of Australia, “Re: Ellerton Holdings Pty Ltd (Administrators Appointed) [2025] FCA 1342.”
  • Bloomberg, Australian Major Bank 5-Year CDS Spreads, Q1 2026.
  • Australian Government, “Financial Claims Scheme – Depositor Protection Summary,” February 2026.

This article does not constitute financial advice.