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The APRA 3% serviceability buffer explained

APRA - the Australian Prudential Regulation Authority - requires authorised deposit-taking institutions to assess every home loan applicant’s ability to repay at the current rate plus 3 percentage points. This is the “serviceability buffer” and it has existed at 3% since November 2021 (raised from 2.5%).

Why the buffer exists

The buffer is a stress test. If you can afford repayments at 9.10% when the actual rate is 6.10%, the lender has confidence you can survive a rate cycle that moves against you without defaulting. The buffer’s job is to prevent another 2008-style lending excess - and, post-COVID, to prevent households over-extending during the low-rate period.

How it changes your borrowing capacity

A 3% buffer translates to roughly a 25-30% reduction in borrowing power relative to what the actual rate would support. On a $1,000,000 “raw” capacity, the buffer gives you about $700,000-$750,000.

When the RBA cut rates by 100 bps in 2025, the buffer stayed at 3%, which meant:

  • Actual rate: -100 bps
  • Stressed rate: -100 bps (the cut flows through to both)
  • Stressed repayment: meaningfully lower
  • Serviceability improved, but not by 100 bps worth

The buffer is additive, so rate changes flow to both sides. The proportional improvement from a rate cut is smaller than the headline suggests.

APRA’s other tools

The 3% buffer is one of three main APRA levers:

1. Loan-to-income caps. APRA has soft-capped DTI at 6x, meaning lenders are scrutinised if too many new loans are above that threshold. High-income borrowers can still go to 7-8x but lenders need to justify it.

2. High-LVR lending limits. APRA monitors the share of each lender’s new loans above 90% LVR. Banks that breach the guidance attract additional oversight.

3. Interest-only caps. IO is capped at 30% of new lending. Most lenders now only offer IO on investment loans.

When APRA might change the buffer

The buffer is reviewed periodically. Historical movements:

  • 2014: introduced at 2%
  • 2019: raised to 2.5%
  • November 2021: raised to 3%
  • No change since

APRA has publicly stated that 3% is calibrated for a “normal” interest rate environment. If rates stabilise for 18-24 months, expect a review. Industry submissions in early 2026 have argued for a 2.5% buffer.

Planning around the buffer

Three practical takeaways:

  1. Don’t count on the buffer falling. Even if APRA reduces it, the decision is probably 12 months away.
  2. Clean up your other debt first. Reducing credit card limits and paying off car loans boosts capacity at current rates without relying on APRA.
  3. Talk to a broker about non-APRA lenders. A narrow set of lenders (non-bank, private) aren’t APRA-regulated and can apply a smaller buffer. Rates are higher, but for marginal cases the extra capacity is the difference between yes and no.