Home Loan Serviceability Buffer Calculator Australia

See how lenders assess your loan at rate plus the APRA buffer.

Loan amount$Interest rate%Serviceability buffer%Loan termyears

—assessed repayment / month

—actual repayment / month

—assessed rate

—extra buffer amount / month

APRA guidance requires lenders to assess your ability to service a home loan at your actual rate plus a serviceability buffer (currently typically 3 percentage points), so you can still afford repayments if rates rise. This affects how much a lender will approve — it isn't the rate you'll actually pay.

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About the Home Loan Serviceability Buffer Calculator

Australian lenders don't just check whether you can afford a home loan at today's interest rate — APRA (the Australian Prudential Regulation Authority) requires them to also assess whether you could still service the loan if rates rose. This calculator shows both figures: your actual monthly repayment, and the higher 'assessed' repayment lenders use to test your borrowing capacity.

How it works

Assessed rate = your actual/advertised interest rate + the serviceability buffer.
Actual repayment is the standard principal-and-interest monthly repayment calculated at your real interest rate.
Assessed repayment is the same loan and term, calculated at the higher assessed rate — this is the figure lenders use to decide whether you qualify.
The difference between the two shows the extra monthly buffer your income needs to be able to cover, in the lender's eyes, even though you won't actually pay it unless rates rise.

Assumptions and behaviour

The default 3.0% buffer reflects APRA's long-standing guidance (in place since October 2021) that lenders assess new borrowers at the loan's interest rate plus a minimum 3 percentage point buffer.
Assumes a standard principal-and-interest loan repaid monthly over a fixed rate for the full term.
Individual lenders may apply their own buffer or additional serviceability rules on top of the APRA minimum — this calculator shows the standard buffer test, not a specific lender's full assessment.

Limitations

This is not a full borrowing capacity or loan approval calculation — actual serviceability assessments also factor in your income, other debts, living expenses (often using a benchmark like the HEM), dependants, and the lender's own credit policy.
APRA's buffer setting can change over time — confirm the current minimum buffer with your lender or broker.
Doesn't account for fees, offset accounts, or interest-only periods.

Privacy

The calculation runs entirely in your browser. Nothing is uploaded or stored.

Frequently asked questions

Is this serviceability buffer calculator free?

Yes — free, no sign-up, no limits, runs in your browser.

What is the APRA serviceability buffer?

It's a minimum margin (currently typically 3 percentage points) that APRA requires lenders to add to a loan's interest rate when assessing whether a borrower can afford the repayments, to build in a safety margin for future rate rises.

Will I actually pay the higher assessed rate?

No. The assessed rate is only used by the lender to test your borrowing capacity — your actual repayments are based on your real interest rate.

Does every lender use the same buffer?

APRA sets a minimum expectation, but individual lenders can apply the same or a higher buffer, and combine it with their own income and expense assessment rules. Check with your lender or broker for their specific policy.

Is my data uploaded?

No. Everything runs locally in your browser; nothing is sent or stored.

Written by Lakshay Kumar(TechLakshay)

A QA Automation Engineer by trade, Lakshay's real passion is untangling complex problems into simple, working solutions — which is exactly why FreeMyTask exists. On Instagram, he channels that same instinct into helping 26,000+ content creators with SEO education, motivation, and hands-on query solving.

Last updated: August 22, 2026