A customer taps a $20 card payment at your counter. The money reaches your business account later, but a portion of that sale has already been allocated across the payments system. For merchants asking what are interchange fees, they are one of the underlying costs of accepting card payments – and one reason the rate on your monthly statement deserves a closer look.
Interchange is not usually a separate bill you pay directly. It is commonly built into your merchant service fee, alongside other charges. That can make it hard to see whether your payment provider is offering a competitive deal or adding more margin than necessary.
What are interchange fees?
Interchange fees are wholesale fees paid between the financial institutions involved in a card transaction. In a typical card payment, the merchant’s payment provider or acquiring bank pays an interchange fee to the cardholder’s issuing bank. The issuing bank is the bank that gave your customer their debit or credit card.
That fee helps fund parts of the card system, including processing transactions, managing fraud risk and providing credit where a customer uses a credit card. The exact interchange amount is set according to card scheme rules and can vary significantly by transaction type.
For a business owner, the practical point is simple: interchange is a genuine cost within card acceptance, but it is not the full cost. Your provider may also charge scheme fees, processing margins, terminal rental and other fees depending on your agreement.
Where interchange sits in a card payment
A card payment involves more parties than most customers realise. Your customer uses a card issued by their bank. The transaction travels through a card scheme, such as Visa, Mastercard or eftpos, and is accepted through your acquirer or payment provider. Your business receives the sale amount less the applicable merchant fees.
The interchange fee flows between the acquiring side and the cardholder’s issuing bank. Scheme fees are separate charges associated with using the card network. Your payment provider then adds its own charge for supplying payment acceptance, settlement, support, terminals and related services.
This is why a single rate can conceal several moving parts. A quote that looks low at first glance may exclude terminal rental, have different rates by card type, or be tied to a contract that makes changing later more difficult.
Why interchange fees vary
There is no single interchange fee for every card payment. The cost can depend on the card, transaction and how the payment is accepted. A tap payment from an Australian debit card may have a different underlying cost from a premium credit card, a corporate card or an overseas-issued card.
Common factors include whether the payment is debit or credit, domestic or international, in person or online, and consumer or commercial. Card-present payments at your café, salon or retail shop are generally assessed differently from card-not-present online payments because the fraud and processing profile differs.
Card scheme rules and interchange categories can also change over time. That means a rate that suited your business two years ago may not be the best fit now, especially if your mix of debit, credit and international cards has shifted.
Debit card routing can affect your costs
In Australia, some debit cards can be processed through more than one available network. The route selected can influence the cost of a transaction and the customer experience at the terminal.
The best routing approach depends on your provider, terminal setup, customer card mix and commercial agreement. It is not as simple as choosing the lowest theoretical cost on every transaction. Reliability, settlement, acceptance and your point-of-sale compatibility still matter. However, it is worth asking your provider how debit transactions are routed and whether you have a choice.
How interchange affects your merchant service fee
Many small businesses are quoted a simple percentage, such as one rate for all card transactions. This is known as a blended rate. It is easy to understand and forecast, which can be useful for a business that values certainty and has modest payment volume.
Under a blended model, your provider estimates the expected cost of interchange and scheme fees across your transactions, then includes its margin in one rate. The trade-off is transparency. You may not know how much of that rate is interchange, how much is scheme cost and how much is provider margin.
Other agreements use interchange-plus pricing, sometimes written as IC++. Under this model, interchange and scheme fees are passed through at their applicable amounts, while the provider charges a disclosed margin on top. For a higher-volume business or one with a varied card mix, this can offer a clearer view of where money is going.
Neither model is automatically better. A straightforward blended rate can be competitive and easier to manage. Interchange-plus can be valuable when it is genuinely transparent and the added margin is reasonable. The right comparison is the total annual cost for your actual transaction profile, not the headline label on a quote.
The costs to check beyond interchange
Focusing only on interchange can lead you to miss fees that materially affect your bottom line. When reviewing a payment-processing offer, look at the complete cost of acceptance, including these four areas:
- Merchant service fee or provider margin, whether charged as a percentage, a fixed amount per transaction or both.
- Card scheme fees, which may be included in the quoted rate or charged separately.
- Terminal costs, including rental, purchase, replacement, mobile connectivity and PCI-related charges where applicable.
- Contract terms, including minimum monthly fees, notice periods, exit fees and pricing changes after an introductory period.
For a busy venue, a small difference in the effective rate can add up across a year. But the lowest advertised rate is not always the lowest total cost. A terminal that does not work properly with your POS, slow support during a service rush, or a difficult rollout can cost more than a few basis points in fees.
How to read your payment statement
Start with the total value of card payments processed in a month, then compare it with your total payment costs. Divide total fees by total card sales to find your effective rate. This gives you a more useful benchmark than looking at one line item in isolation.
Next, check whether your statement separates domestic debit, domestic credit, premium, commercial and international cards. Look for scheme fees, terminal rental, monthly service fees and charges that do not appear in the original headline rate.
If your provider offers a blended rate, ask what it includes. If it offers interchange-plus pricing, ask for the provider margin and a clear explanation of which scheme fees are passed through. You should also confirm whether GST is included in quoted figures and whether any minimum fees apply.
A good comparison uses several months of statements, not a single quiet or unusually busy month. Seasonal businesses, restaurants with weekend peaks and retailers with holiday trading can otherwise get a distorted result.
Can you pass interchange costs on to customers?
Interchange itself is not generally the amount you should use to calculate a card surcharge. Australian surcharging rules focus on your cost of accepting the payment type, not just one component of that cost. Charging more than your permitted cost of acceptance can create compliance issues.
If your business applies a surcharge, make sure it is based on accurate payment cost data and displayed clearly to customers before they pay. Consider the commercial side as well. A surcharge may recover costs, but it can affect customer perception, particularly for lower-value purchases.
Some businesses choose not to surcharge and instead focus on reducing their underlying merchant rates. Others use a carefully calculated surcharge as part of their pricing approach. It depends on your margins, customer expectations and the types of payments you accept.
Turning fee detail into a better decision
Interchange fees are unavoidable within many card transactions. Excessive provider margins, unnecessary terminal charges and restrictive contract terms are not. The opportunity is to separate the unavoidable wholesale costs from the parts of your payment bill that can be negotiated or changed.
Before switching, confirm your current contract conditions, your terminal and POS requirements, settlement timing, support arrangements and whether your new provider can keep your business trading throughout the transition. A cheaper rate is only a real saving if the change is practical for your team.
PaiCompare can help Australian merchants compare payment costs against providers that suit their transaction profile, then coordinate the switch without adding unnecessary admin to the job. The most useful next step is to put a recent statement beside a clear quote and ask one direct question: what am I really paying to take each card payment?
