Personal Loan vs Credit Card: Which Is Cheaper for a Big Purchase?

Furniture, a big renovation job, an unexpected bill. When a large expense lands, the two most obvious options are usually a personal loan or your existing credit card. They're not interchangeable, and picking the wrong one can cost you more than you'd expect.

The reason it matters isn't the rate on the day. It's what each product does to your behaviour over the following year. One has a fixed end date built into it. The other has a minimum repayment that shrinks as the balance shrinks, which is a design that rewards patience on the lender's side rather than yours. That difference usually costs more than the rate gap does.

Credit cards

The upside: Instant access, no application process if you already have the card, and if you can pay it off within the interest-free period, it can genuinely cost you nothing extra.

The catch: Once you're past the interest-free window, credit card interest rates are typically well above personal loan rates, and if you're only making minimum payments, the balance can take years to clear while interest keeps compounding.

How the interest-free period actually works

It's conditional, and the condition is the part people miss. The interest-free days generally apply only if you pay the closing balance on your statement in full by the due date. Pay part of it and the benefit usually stops, with interest charged on purchases from the date you made them rather than from the due date.

Cash advances are treated differently again. There's normally no interest-free period on them at all, interest starts immediately, and a fee often applies on top. Using a card at an ATM, or for anything the bank classes as a cash-like transaction, is not the same as buying a fridge with it.

Why minimum repayments stretch out

A minimum repayment is usually calculated as a small percentage of the balance, subject to a floor. As the balance falls, the minimum falls with it, which is why paying the minimum on a large balance can keep you there for years. Your statement is required to show how long it would take and what it would cost if you only ever paid the minimum. That box is worth reading, because it's the clearest number the industry publishes about itself.

Personal loans

The upside: A fixed term, a fixed (or at least clearly structured) repayment schedule, and typically a lower interest rate than a credit card carrying an ongoing balance. You know exactly when it'll be paid off from the day you sign.

The catch: It's a proper application process, so it takes longer to access than tapping a card you already have, and if you pay it off early some lenders charge an exit fee.

A few structural points worth knowing. Personal loans can be secured against an asset or unsecured, and secured is usually cheaper because the lender holds something if it goes wrong. The rate can be fixed for the term or variable, which changes both your budgeting certainty and how freely you can pay it out early. And the loan usually carries fees: an establishment fee at the start and often a monthly account-keeping fee, both of which matter more on a small loan than a large one.

What does the comparison rate tell you?

The comparison rate folds the interest rate and most standard fees into a single percentage, so two loans can be lined up against each other properly. If a lender's comparison rate sits well above their advertised rate, fees are doing work in the background.

It has limits. It's calculated on a standard loan amount and term, so if yours is smaller or shorter, fixed dollar fees hurt proportionally more than the published figure suggests. It also excludes fees that only apply if something happens, such as a late payment or an early payout. The number that settles arguments is the total amount payable over the full term, in dollars. Ask for it.

The real comparison

For a purchase you can genuinely pay off within a card's interest-free period, the card can be the cheapest option. Free credit, essentially. But for anything you'll be paying off over months or years, a personal loan's lower rate usually wins by a wide margin, since credit card interest on a carried balance adds up fast.

Where the card genuinely wins

Beyond the interest-free period, a card has a few advantages worth naming. It's already approved, so there's no new credit enquiry on your file. For a purchase that might be refunded, or a deposit on something that could fall through, a card gives you chargeback options a loan doesn't. And for a cost you're not sure you'll incur at all, drawing only what you need beats borrowing a fixed sum and paying interest on the part you didn't spend.

What about a balance transfer offer?

A promotional balance transfer rate can be a genuine reset if you treat it as a deadline rather than a discount. Three things to check before you take one. What the rate reverts to when the promotional period ends, because that's usually the standard purchase or cash advance rate. Whether a transfer fee applies upfront. And how new purchases on that card are treated, since on many cards your repayments are applied to the transferred balance first, leaving new spending accruing interest the whole time. A transfer that ends with the same balance sitting at the revert rate hasn't achieved anything except a delay.

An illustration of the same purchase both ways

The numbers here are invented, deliberately round and illustrative only. They're not rates or repayments from any lender, and interest is left out on purpose so the structural difference is visible on its own.

Say the expense is $6,000. On a three year personal loan, that's a bit under $170 a month in principal, and the loan ends on a date you can see from the day you sign. Put the same $6,000 on a card and the required payment might start around $120 a month, then fall every month as the balance does. The smaller required payment feels easier, and it's the mechanism that keeps the balance alive.

Now add the fees to the loan side, because they're real. An invented $300 establishment fee plus $10 a month over three years is $660 on top. On a $6,000 loan that's worth knowing about before you compare it to anything. On a $60,000 loan the same fees barely register. Which is exactly why the comparison has to be run on your amount and your term, not on the standard example.

A rough way to decide

• Can you clear it within the interest-free period (usually 45-55 days)? Card, if you're disciplined about it.
• Will it take longer than that to pay off? Personal loan is very likely cheaper overall.
• Is it a one-off large expense rather than ongoing spending? A personal loan's fixed structure tends to suit a single big purchase better than an open-ended card balance.

The honest test on the first one is whether the money is already sitting somewhere, or whether clearing it in full depends on a month going better than most months do. If it's the second, you're choosing the card on optimism rather than arithmetic.

What a lender checks before approving a personal loan

Australian lenders have responsible lending obligations under the National Consumer Credit Protection Act, which means an assessment rather than a formality.

• Your income, its type, and how long you've been earning it
• Your living expenses, assessed properly rather than taken as a round guess
• Existing debts, including other loans and buy now pay later accounts
• Your credit card limits, which are usually counted in full rather than at the balance
• Your credit file, including repayment history and recent enquiries
• What the loan is for, since some purposes are priced or restricted differently
• Whether the loan is secured, and if so, what the asset is

Two of those are worth expanding. Lenders test your repayment at a rate above the one you'd actually pay, so an approval usually lands below what a repayment calculator suggests. And the credit card limit point works against you even when you use the card well, because a large unused limit reduces what you can borrow elsewhere.

Questions worth asking before you choose

Does applying for a personal loan hurt your credit score?

An application is recorded as an enquiry on your file whether or not it's approved, and a run of applications in a short period tends to read as financial stress rather than diligence. Under comprehensive credit reporting your file also carries repayment history, so consistently paying on time does work in your favour over time. The practical approach is to get your position checked against lender criteria before formally applying, rather than applying several times to find out.

Is increasing your credit limit a simpler option?

It's a full application too, with its own assessment and its own enquiry, so it isn't the shortcut it appears to be. It also has a lasting effect, because the higher limit is counted against you in future borrowing assessments even if you never draw on it.

What about buy now pay later?

It shows on your bank statements, so lenders see it whether or not it appears on your credit file, and regular use of several accounts reads as reliance rather than convenience. Missed payments are worse again. If a home loan or car loan is on the horizon, that's worth factoring in before you split a large purchase across four payments.

What to have ready

If you go the loan route, having this together turns a drawn out process into a short one.

• Recent payslips, or two years of returns and financials if you're self employed
• Bank statements for your everyday accounts covering the last few months
• Every debt with its limit, balance and repayment, including buy now pay later
• An honest living expenses figure, built from your statements rather than estimated
• The amount you actually need, and what it's for
• Your own credit report, so nothing in the assessment is a surprise
• The total amount payable quoted in dollars, for every option you're weighing up

The habit worth watching

The real risk with cards isn't the tool, it's the temptation. A large purchase on a card that "you'll pay off soon" has a habit of turning into an ongoing balance that quietly grows. A personal loan forces the discipline of a fixed schedule, which for some people is genuinely the better outcome even if the paperwork takes a little longer upfront.

Run the actual numbers on your specific amount and timeframe. Compare City can show you the total cost of a personal loan versus your card's ongoing interest before you decide.

More on personal loans and debt consolidation.