How Much Can I Actually Borrow? A Plain-English Guide for First Home Buyers

You've been saving, you've been dreaming, and now you're ready to take the first real step. But before you start scrolling through listings, there's one number you need to know: how much will a lender actually let you borrow?

It's a question almost every first home buyer has, and the answer is more nuanced than an online calculator might suggest. This post walks you through the key factors lenders look at when assessing your borrowing capacity — so you can go into the process with realistic expectations and no nasty surprises.

It's Not Just About Your Income

Most people assume borrowing capacity is simply a multiple of your salary. While income is a major factor, lenders look at the full picture of your finances. That means they'll assess:

• Your income — including salary, overtime, rental income, and in some cases government payments (eligibility varies by lender)

• Your expenses — regular living costs, subscriptions, school fees, and anything that comes out of your account each month

• Your existing debts — car loans, personal loans, HECS/HELP debt, credit cards (even ones you don't use), and buy-now-pay-later accounts

• Your dependants — lenders factor in the cost of supporting children or other dependants

  
  

The gap between what you earn and what you spend is called your "net surplus" — and lenders want to see that you'll have enough left over each month to comfortably meet your repayments.

The Stress Test: Borrowing at a Higher Rate

Here's something that surprises a lot of first home buyers. Lenders don't just check whether you can afford repayments at today's interest rate. APRA (the Australian Prudential Regulation Authority) requires lenders to assess whether you could still make repayments if interest rates rose by 3% above your loan rate. This is called a serviceability buffer.

So if your loan rate is 6%, the bank tests your repayments at 9%. It's a safeguard designed to make sure you're not stretched too thin if rates move against you — and it does reduce your maximum borrowing capacity compared to what a basic calculation might show.

What Actually Reduces Your Borrowing Power?

A few things can quietly chip away at how much a lender will offer you:

• Credit cards — Lenders assess your credit limit, not your balance. A $10,000 credit card limit you never use can still reduce your borrowing capacity by tens of thousands of dollars. Consider reducing limits or closing cards you don't need before applying.

• Buy-now-pay-later — Afterpay, Zip, and similar services are increasingly being picked up by lenders as liabilities.

• HECS/HELP debt — This reduces your net income in the eyes of lenders, even though repayments are income-contingent.

• Multiple income sources — Some lenders discount casual or overtime income, which can affect borrowing capacity for workers who rely on it.

  
  

None of these are deal-breakers — but they're worth knowing about well before you apply.

How Much Can You Actually Borrow?

As a rough guide, many lenders will allow you to borrow somewhere between four and six times your gross annual income, depending on your circumstances. But this varies significantly based on your expenses, debts, the size of your deposit, and which lender you go with.

For example, two people both earning $90,000 a year could receive very different borrowing assessments if one has a car loan and a $15,000 credit limit and the other has neither. This is why it's worth understanding your own numbers — not just the headline figure.

It's also worth knowing that different lenders have different appetites. Some are more conservative; others are more flexible with certain income types or living situations. A mortgage broker can compare your profile across multiple lenders to find the one that works best for you.

Getting a Clearer Picture Before You Start

Rather than guessing, there are a few practical steps you can take right now:

1. Review your credit cards and loans — note balances, limits, and monthly repayments

2. Track your living expenses — most lenders will ask for three to six months of bank statements

3. Check your credit file — you're entitled to a free copy via services like Equifax or Illion

4. Look at your HECS balance — this is visible via your MyGov account

   
   

Once you have this together, a mortgage broker can give you a realistic borrowing estimate — one that actually reflects what lenders will offer, not just what a generic calculator spits out.

The Bottom Line

Borrowing capacity isn't a fixed number — it's shaped by your income, your debts, your expenses, and the lender you choose. Understanding the factors that influence it puts you in a much stronger position when you're ready to apply.

The good news? With a bit of preparation, many first home buyers find they can borrow more than they expected — or identify a few quick wins (like reducing a credit limit) that make a real difference.

Want to know where you actually stand? Chat with the Cultivate Financial team — we'll walk you through your borrowing capacity in plain English, with no obligation.

This article provides general information only and has been prepared without taking into account your objectives, financial situation or needs. We recommend you consider whether it is appropriate for your circumstances. It does not constitute legal, tax or financial advice — please seek professional advice for your individual situation.