How Much Can I Borrow With Bad Credit in Australia?

A borrowing capacity calculator doesn't reduce its answer because you have bad credit — it uses a neutral, mid-range interest rate to work out what your income can service, regardless of your score. What bad credit actually does is push up the rate you'll be offered once you apply for real, and it's the higher repayment on that real rate — not the capacity figure itself — that eats into what you can genuinely afford.

The number you're seeing isn't adjusted for your score

Here's something that surprises a lot of people: a borrowing capacity calculator doesn't actually know your credit score reduces what you can safely borrow — because in the underlying calculation, it doesn't ask. Capacity tools like this one assess what you can afford using a neutral, middle-of-the-road interest rate, on the basis that capacity is a question about your income and expenses, not your credit history.

That's not a flaw — it's a deliberate design choice, because borrowing capacity and creditworthiness are genuinely two different questions. But it does mean the headline number you see isn't automatically smaller because you have a low score. What actually happens is more specific, and worth understanding before you rely on that number.

Two separate questions, one easy mix-up

It helps to keep these apart in your head: "how much can I afford to repay each month?" is an income-and-expenses question. "What rate will I actually be offered?" is a credit-history question. A borrowing capacity calculator only answers the first one. Treating its output as if it already accounts for the second is where the surprise at application time comes from.

What bad credit actually changes: the rate, not the ceiling

Your credit score determines the interest rate band you'll realistically be offered. The wider that band, the bigger the repayment on the same loan amount — and it's the repayment, not your score, that gets tested against your income in the affordability calculation.

Non-homeowners: add 2 percentage points to both ends of every band above.

Why the calculator can't just use your real rate automatically

In principle, a capacity tool could ask for your credit score and adjust the rate accordingly. Most don't, including the neutral, middle-of-the-road estimate used here — mainly because the exact rate a lender offers depends on more than the score alone, and giving a false sense of precision is worse than being clearly approximate. A borrowing capacity result is typically calculated using a rate somewhere in the middle of the table above — a reasonable estimate for an average applicant, but not your actual rate if your score sits in one of the lower bands.

Worked example: same loan, different real rate

Take a $20,000 loan over 5 years. At a neutral, mid-range rate around 13%, the monthly repayment works out to roughly $455. Now compare that to the rate a borrower in the 500–649 band would realistically be offered — around 19% for a non-homeowner — where the same $20,000 loan costs closer to $519 a month.

That's an extra $64 a month for the exact same amount borrowed. If your income and expenses only left, say, $70 of buffer room in the original calculation, that gap alone can be the difference between an application that clears affordability and one that doesn't — even though the "capacity" figure never changed.

The takeaway: bad credit doesn't lower your borrowing ceiling in the capacity calculation itself. It raises the cost of borrowing, and that higher cost is what actually eats into your real affordability.

A second example, further down the scale

Push the same $20,000 loan to the under-500 band — a 22% rate for a non-homeowner — and the repayment climbs to roughly $560 a month, over $100 more than the neutral estimate. At that gap, a loan amount that looked comfortably affordable on the capacity calculator can move into "won't pass affordability" territory once the real rate is applied, without your income or expenses changing at all.

Why this matters more the closer you are to your limit

If there's plenty of daylight between what you want to borrow and your calculated capacity, a rate difference of a few percentage points usually won't change the outcome. But if you're borrowing close to your ceiling, the gap between the neutral rate used in a capacity estimate and the real rate a lower score attracts can be exactly what pushes a borderline application from affordable to not.

This is also why two people with identical income, expenses, and requested loan amount can get genuinely different outcomes — the one with the stronger credit score is paying less for the same money, which leaves more room in their monthly budget.

It compounds with everything else in the affordability formula

Your rate isn't the only thing pushing against your residual — credit card limits are counted at 3.5% of the total limit per month regardless of the balance, and existing debts and rent or mortgage are all in the same calculation. A weaker rate from bad credit lands on top of whatever those other commitments already take up, which is why applicants with several factors working against them at once tend to see the gap between "capacity" and "what's actually affordable" widen the most.

What to actually do about it

1. Check your real rate first. Use the loan repayment calculator with your actual Equifax score to see the rate band and repayment you'd realistically be offered — not the neutral estimate.
2. Re-run your affordability at that real repayment. If the higher repayment pushes your residual close to zero or negative, that's a sign to borrow less, not to assume the capacity figure still holds.
3. Work on the score before the amount, if you have time. Moving from the 500–649 band into 650–699 or higher can meaningfully lower your real rate — see How to Improve Your Credit Score for a Personal Loan for what actually moves the number.
4. Consider a smaller amount or a longer term. Both reduce the monthly repayment, which gives you more buffer against a higher real rate.

If your score is close to a band boundary

Scores near the edge of a band are worth a second look before you apply. Someone at 645 is one tier away from the meaningfully better rates starting at 650 — and a small, achievable change (clearing a small default, waiting a few weeks after a recent hard enquiry drops off, paying down a credit card balance) can be enough to cross that line before you commit to an application at the worse rate.

Check your actual capacity with your real numbers on the borrowing capacity calculator, then confirm the real repayment cost with the loan repayment calculator before you rely on either number alone.