An interest-free promotion has a deadline. The useful question is not just "What is the minimum payment?" but "What payment clears this purchase, with its fees, before the promotional rate ends?"
Moneysmart's interest-free guide explains that these purchases are often linked to a store or credit card. The retailer introducing the offer may not be the lender. Fees can still apply, and minimum repayments may leave a balance when the promotion ends.
Copy the deal into a five-line record
Before accepting, record the purchase amount, promotion end date, fees during the promotion, repayment rules and the rate or charges that apply afterwards. Identify the actual credit provider and keep the contract, not just the store's advertisement.
Also ask how payments are allocated if the account has more than one purchase. An older balance or a new non-promotional purchase can complicate what looks like a simple instalment arrangement. Use the lender's written explanation for your account rather than assuming every payment reduces this particular purchase.
Calculate a clearance payment
Here is an illustration, not a finance offer. Assume a $2,400 purchase, a 24-month promotion, a $10 monthly account fee, no other spending or fees, and payments allocated first to that monthly fee and then to this purchase:
- Principal needed each month: $2,400 / 24 = $100.
- Monthly fee: $10.
- Payment to clear on these assumptions: $110 a month.
- Total paid: $110 x 24 = $2,640.
If you paid $60 a month under those same assumptions, only $50 would reduce the purchase each month. After 24 payments, $1,200 of the purchase would remain. The actual agreement might allocate payments differently, so check its rules before using this calculation.
This is why a zero promotional interest rate can still involve a dollar cost. It is also why a payment labelled "minimum" is different from a payment designed to clear the balance.
Run a monthly end-date check
Our suggested routine is to record the remaining promotional balance after each statement, then divide it by the number of payments left before expiry. Add fees you still need to cover. If the result has risen beyond your budget, contact the credit provider early rather than leaving the decision to the final month.
Moneysmart notes that a lender does not have to remind you when the interest-free period ends. Set your own reminder before expiry, allowing time for the final payment to be processed and confirmed. Check the next statement for residual fees or balances.
Keep new spending separate in the comparison
Moneysmart warns that other purchases on a linked card may not receive the promotional rate. If you are comparing this deal with a personal loan, compare the total payments, fees and end date for the same purchase amount. Do not compare a store's minimum payment with a fully amortising loan repayment as though they finish at the same point.
Our comparison rate explainer covers a different part of loan comparison. For an interest-free promotion, the first job remains specific: know which balance the promotion covers, when it ends and what payment clears it. If the item is an eligible essential and you meet the criteria, also check No Interest Loans.
