How APRA Buffers, HEM and Rental Shading Really Limit Your Next Loan

APRA’s serviceability buffer, the Household Expenditure Measure (HEM) and rental income shading are the three main levers lenders use to decide whether you can afford your next geared purchase – and how much you can borrow.

For most Australian borrowers, lenders must (1) test your repayments at 3% above the actual rate (APRA buffer), (2) assume at least a minimum level of living expenses (HEM), and (3) only count 70–80% of rental income on investment properties (rental shading). Together, these rules often cut your “real” borrowing power far below what your spreadsheet shows.

This guide explains those rules in plain English, shows worked examples, and gives you a one‑week action plan to improve your position before you buy or refinance.

APRA’s buffer, HEM and rental shading work together to decide how much you can borrow.

1. Why these three tests matter so much for geared investors

If you hold – or plan to hold – more than one property, APRA buffers, HEM and rental shading are not technical side issues. They are the lending decision.

Every lender has its own flavour of credit policy, but almost all of them in Australia now work inside the same framework:

1. APRA buffer – most banks must add 3 percentage points to the actual interest rate and test if you can still afford principal and interest (P&I) repayments on all relevant debts.
2. HEM – they must compare your declared living expenses to an ABS‑based benchmark (Household Expenditure Measure) and use the higher number.
3. Rental shading – they only count a portion (commonly 70–80%) of current or proposed rent when working out your income.

These settings are especially important if you:

• Own a home and want to keep it as an investment when upgrading
• Already have 1–3 investment properties and want another
• Are self‑employed or have lumpy income
• Are looking at higher‑yielding but riskier assets to push serviceability

If you haven’t read it yet, pair this guide with our broader explainer, “Bank Rules, Buffers and Borrowing Power for Geared Property Investors” – that article zooms out on the full serviceability model, while this one zooms in on the three most important levers.

2. APRA’s 3% serviceability buffer – what it is and how it bites

2.1 The rule in plain English

Since late 2021, APRA has generally expected banks to test new home loans at least 3 percentage points above the actual rate you’ll pay (there are narrow exceptions for some non‑bank and specialist lending).

So if a lender is offering you 6.00% today:

• Your actual contract rate might be ~6.00% p.a. (variable)
• Your assessment rate might be 9.00% p.a. principal and interest

The bank then reruns your entire financial life at 9% P&I on home and most investment debt, plus shading your rental income. If the numbers don’t work at 9%, they don’t lend – even if you feel comfortable at 6%.

2.2 Why APRA uses a buffer at all

APRA’s job is financial stability, not helping you buy one more townhouse.

The buffer is there to:

• Allow for future rate rises without borrowers getting into distress
• Force lenders to factor in income shocks and cost‑of‑living pressure
• Stop the market from running too hot whenever rates are temporarily low

This matters even more now that the 2026–27 Budget and the negative gearing reforms will reduce after‑tax cashflow for many new established properties bought after 12 May 2026. If your numbers only just work at today’s rates and with today’s tax rules, you’re walking into a tightening vice.

2.3 How the buffer changes your borrowing power – worked examples

Let’s compare borrowing capacity at different buffers for a simple scenario.

Assumptions (illustrative only, not advice):

• Couple with one child, gross combined income: $200,000 p.a.
• No other debts, modest credit cards
• Actual interest rate: 6.00%
• 30‑year P&I term
• Lender uses a basic version of HEM and a 3% buffer

*Illustrative only – each lender’s calculator is different.

A shift from a 2% to a 3% buffer can easily cut borrowing power by $150–200k for a typical dual‑income household.

For geared investors with existing debts, the impact is often larger because those existing loans are also tested at the higher rate and as P&I, even if they’re currently interest‑only.

2.4 Existing loans are tested at higher P&I rates too

Most major lenders will:

• Take all existing housing debt (home and investment)
• Convert repayments to principal & interest over the remaining term (or a minimum of 25–30 years)
• Apply the buffered assessment rate

If you have:

• Home loan: $900k, 6.00% IO, 5 years IO remaining, 25 years total term
• Two investment loans: each $600k, 5.90% IO, 25 years remaining

The bank may test these at around 9% P&I over the remaining terms, which can turn what feels like a manageable real‑world portfolio into a tight assessed position.

3. HEM – the quiet benchmark that caps your borrowing power

3.1 What is HEM?

HEM stands for Household Expenditure Measure. It’s a statistical benchmark of typical living costs for different household types in Australia. It’s built from ABS and other data and updated periodically.

Each lender has its own version and margin above HEM, but the core principle is the same: your living expenses cannot be assessed below their HEM benchmark for your profile.

3.2 How banks use HEM in serviceability

In every application, the lender will:

1. Ask you to break down your living costs (food, utilities, insurance, childcare, etc.)
2. Map you against their HEM tables (by income band, marital status, dependants)
3. Use the higher of:
   • Your declared expenses, or
   • Their HEM figure (including any internal buffers)

Lenders also compare HEM to your income to make sure the numbers are realistic. If you declare expenses far below HEM, expect questions.

3.3 Indicative HEM levels (very rough)

Each bank’s HEM differs, and they change over time. But to give a feel, here’s an indicative range (not a live figure, just an example).

*Illustrative only – real figures vary by lender, income, region.

If your real spending is lower, the bank may still use HEM. If your spending is higher, they’ll normally use your higher real expenses.

3.4 HEM and ‘lifestyle creep’

For higher‑income professionals and business owners, the HEM floor often isn’t the issue – your real expenses are.

Common expense categories that quietly hammer capacity:

• Private school fees and childcare
• High insurance bundles
• Multiple streaming, subscription and app services
• Uber, dining out, travel and retail spending

Some expenses can be reduced quickly before an application. Others (like school fees) are durable and lenders will fully count them.

For detailed strategies on managing income and expenses from a tax and lending perspective, see “How Negative Gearing, Dividends and Business Income Shape Your Loans”.

4. Rental income shading – why your rent never counts 100%

4.1 What ‘shading’ means

Rental shading is simply a conservative haircut on your rent.

Most mainstream lenders:

• Start with actual rent received or a valuer’s rental estimate
• Deduct 20–30% to allow for vacancies, costs and risk
• Use the remaining 70–80% as assessable income

As referenced in earlier pieces like our article on upgrading and keeping your existing home, lenders commonly count only 70–80% of rent when assessing serviceability for multi‑property borrowers.

4.2 Why lenders shade rental income

Rental shading is designed to recognise that gross rent is not your free cashflow. It has to cover:

• Vacancies and reletting
• Property management and landlord insurance
• Repairs and maintenance
• Rates, water, strata and other holding costs
• Income shocks in downturns

From the bank’s perspective, this is part of making sure your portfolio can survive beyond the glossy spreadsheet phase.

4.3 Worked example: how shading changes the numbers

You’re buying a townhouse with expected rent of $800 per week.

• Gross annual rent: $800 × 52 = $41,600
• Lender shading at 80%: $33,280 used in the calculator
• Monthly income used: ~$2,773

If your actual non‑property income is tight, that missing $8,320 of “ignored” rent can easily trim $50–100k+ from your borrowing capacity.

Shading is even more impactful when you own multiple properties. Every rental is partially ignored, while every dollar of debt is fully counted at the buffered rate.

4.4 When lenders shade more heavily

Some lenders may shade more aggressively where:

• The property is in a high‑risk postcode (e.g. high‑density towers, oversupplied pockets)
• The asset is specialty or non‑standard (student accommodation, short‑stay, NRAS, certain co‑living models)
• The rent is short‑stay or Airbnb‑style and not on a long lease

This is where portfolio design matters. In some cases a more “boring” long‑term rental at a slightly lower headline yield can deliver more bank‑tested income than a flashy short‑stay arrangement.

For a worked example of keeping your old unit as an investment when upgrading – where shading, buffers and reclassification all collide – see “Should You Keep Your Old Zetland Unit as an Investment Property?”.