Buying your first home in Australia has always been dependent on two things: interest rates and lending rules. RBA rate changes impact affordability but it’s really the lending rules brought in by banks and regulators that determine how much you can borrow and whether you even get approved.

These rules have changed a lot in the last few years. First-home buyers in 2026 will experience a system that is more supportive in some areas and more strict in others.

This article explains exactly what has changed and how it impacts your borrowing power.

1. Stricter Serviceability Rules (Harder to Borrow than Before)

One of the biggest changes is how banks determine if you can afford a loan.

What’s different:

• Banks now “stress test” borrowers at higher interest rates
• A serviceability buffer is applied by regulators such as APRA
• Banks assess you at a higher rate than your actual loan rate
• You must prove you can still afford repayments if rates rise

Interest rates may have steadied, but banks are still required to stress test for future risk scenarios, limiting borrowing power.

What this means for first home buyers:

• You may qualify for a smaller loan than expected
• High income does not always mean high borrowing power
• Expenses are examined more carefully than before

Even if rates appear stable, banks continue to position for potential future increases.

2. Debt-to-Income (DTI) Limits Are Now Active

The biggest new lending rule is the introduction of debt-to-income limits.

What is DTI?

It compares your total debt to your income.

For example:

• High debt + modest income = high DTI = harder to qualify

What the rule does:

• Banks can only lend a limited portion of loans to high-DTI borrowers
• Large mortgage-to-income ratios are more restricted

What this implies:

• High-income buyers are not immune if loan sizes are large
• Investors and buyers in expensive cities (like Sydney) are most impacted
• First home buyers without existing debt are generally in a stronger position

DTI is now one of the most important approval filters.

3. HECS/HELP Student Debt Rules Have Been Relaxed (But Not Removed)

One of the most significant changes is how lenders treat student debt.

Old approach:

• HECS repayments reduced borrowing power directly
• Treated like any other ongoing expense

New approach:

• Some lenders reduce or ignore HECS impact if it’s close to being paid off
• Smaller balances may be discounted
• Some policies exclude HECS in certain assessments

What it means for first home buyers:

• Graduates now have improved borrowing power
• Younger professionals are less penalised than before
• Policies still vary between lenders

Student debt is less of a barrier than before, but it still matters in some cases.

4. Flexible Deposit Rules (More Support from Government)

Deposit rules have become more flexible due to government support schemes.

Main changes:

• Low deposit options are more accessible
• Some borrowers avoid Lenders Mortgage Insurance (LMI) under guarantee schemes
• More lenders participate in first home buyer programs

What this means:

• Some buyers can enter the market with as little as a 5% deposit
• First home buyers have more entry pathways
• Demand can still increase competition for properties

Saving 20% is no longer the only way in.

5. Living Expense Checks Are Much Tighter

Banks now scrutinise spending behaviour more closely than ever.

What lenders analyse:

• Everyday expenses (food, transport, subscriptions)
• Credit card usage
• Buy now, pay later services
• Consistent savings habits

Why it matters:

Your lifestyle is now part of your loan assessment.

Irregular or high spending can reduce borrowing approval even if income is strong.

6. Ongoing High Interest Rate Stress Testing

Even if real interest rates stabilise, banks still assess borrowers at higher hypothetical rates.

What this means:

• You must prove you can repay at higher “stress” rates
• Borrowing capacity is reduced across the board
• Adds protection against future rate increases

Banks are planning for worst-case scenarios, not current conditions.

7. What It Means for First Home Buyers in 2026

Easier in some respects:

• Stronger treatment of student debt
• More government support schemes
• Low deposit pathways available

More difficult in others:

• Tight borrowing calculations
• Debt-to-income limits
• High cost of living factored into assessments
• Strict affordability stress testing

Real reality:

First home buyers are not excluded, but they are assessed more strictly than in previous years.

Final Conclusions

Lending rules in Australia have changed in multiple directions at once.

• Some changes help buyers enter the market earlier
• Others protect the financial system from risk

This creates a more balanced but stricter lending environment:

• Approval is still possible
• Borrowing capacity is more controlled
• Financial discipline is more important than ever

For first home buyers, success in 2026 is not about timing the market — it’s about understanding how lending rules affect your real borrowing power.