Cheapest Online Payment Processing for Small Businesses in Australia

Isabella runs a stationery and gift-wrap store out of a shopfront in Brisbane’s West End, with an online store that now does more business than the shop itself. Her average sale is small — a set of greeting cards here, a $12 washi tape bundle there — but her volume is enormous, sometimes 40 or 50 orders a day during the lead-up to Christmas and Mother’s Day. She’d always assumed that because her margins were thin, the answer was simple: find the gateway with the lowest advertised percentage rate, and switch.

So she did. She moved from her original provider to one advertising a headline rate nearly a full percentage point lower. Three months later, her processing costs as a share of revenue hadn’t dropped — they’d gone up. The new gateway’s rate card had a flat fee bolted onto every transaction that her old provider didn’t charge, and on a $12 sale, that flat fee did more damage than the lower percentage ever saved her. Isabella had optimised for the wrong number.

The Real Cost of “Cheap”: Why the Headline Rate Is Only Half the Answer

Every gateway pricing page leads with the same kind of number — “1.75% + 30c,” “1.6% + 30c,” “2.2%” — and it’s natural to read that as a ranking. But a processing fee is really two separate variables bolted together: a percentage that scales with the size of the sale, and (usually) a flat fee that doesn’t care how big or small the sale was. Depending on your average order value, either one of those variables can dominate your total cost, and a gateway that looks expensive on the rate card can be the cheapest one you could have chosen — or vice versa.

Meet the Contenders: The Lowest-Cost Gateways for Australian Small Businesses in 2026

Rather than one universal “cheapest” gateway, small businesses in Australia today have a genuine shortlist of low-fee, no-lock-in options, each built around a slightly different pricing philosophy. Figures below are current published online/card-not-present rates at the time of writing, exclusive of GST unless stated — always confirm current pricing directly with the provider, since rates and promotions do shift.

eWAY: The Flat-Rate Veteran Built for Predictability

eWAY charges Australian merchants a flat domestic online rate of roughly 1.5% plus 25 cents, regardless of whether the card is Visa, Mastercard or American Express — a detail that quietly saves money for any small business that takes a meaningful share of Amex. There’s no monthly fee and no lock-in contract, though a modest annual PCI compliance fee applies. For a business with a moderate-to-high average order value and a mostly domestic customer base, it’s consistently one of the cheapest options on the market.

Pin Payments: Simple, Local, and Free of Surprises

Pin Payments prices domestic cards at around 1.6% plus 30 cents, with no monthly fees and no setup costs. It won’t out-feature the bigger players, but for a small store that wants one predictable number and a pricing page that doesn’t need reading twice, it remains one of the leanest options available.

WooPayments: Stripe’s Rails, Priced Competitively for WooCommerce Stores

Built natively into WooCommerce and running on Stripe’s global infrastructure, WooPayments charges roughly 1.75% plus 30 cents on domestic cards, with no monthly fee. It’s a strong low-cost default for a new-to-mid-size store, provided your customer base is mostly domestic — the international and currency-conversion add-ons are where the cost climbs.

Square: The Percentage-Only Option That Rewards Low-Value Sales

Zeller: The Challenger Undercutting Everyone on Invoicing and Virtual Terminal Payments

Airwallex: Cheapest for the Small Business Already Juggling Multiple Currencies

Airwallex prices domestic cards from around 1.65% plus 30 cents, with a currency conversion markup of roughly 0.5% on major currencies — noticeably tighter than most competitors. It’s rarely the cheapest option for a purely domestic small business, but for one sourcing stock overseas or selling into more than one currency, the combination of competitive card rates and a low FX markup can beat every gateway on this list once total currency costs are counted, not just the checkout fee.

PayPal: Not the Cheapest, But Sometimes Worth the Premium

PayPal’s domestic rate of around 2.9% plus 30 cents is the most expensive of the mainstream options covered here, and it should rarely be your only gateway on cost grounds alone. Where it earns its place is as a secondary option layered on top of a cheaper primary gateway, converting hesitant first-time shoppers who trust the PayPal login more than an unfamiliar checkout form. Treat it as a conversion tool, not your cost-optimisation strategy.

Small But Mighty: Why Your Average Order Value Decides Which Gateway Is Actually Cheapest

Here’s the calculation Isabella wishes she’d done before she switched providers. Take a $12 sale — one of her typical washi tape bundles — and run it through three different fee structures:

eWAY, at 1.5% plus 25 cents: $0.18 + $0.25 = $0.43, an effective rate of 3.6% on that sale.
Pin Payments, at 1.6% plus 30 cents: $0.19 + $0.30 = $0.49, an effective rate of 4.1%.
Square, at a flat 2.2% with no fixed fee: $0.26, an effective rate of exactly 2.2%.

On that $12 sale, Square — the gateway with the “highest” headline percentage on this list — is actually the cheapest, because there’s no flat fee dragging the effective rate up on a small transaction. Now run the same three gateways against a $180 sale, the kind of order value a homewares or furniture retailer might see:

eWAY: $2.70 + $0.25 = $2.95, an effective rate of 1.64%.
Pin Payments: $2.88 + $0.30 = $3.18, an effective rate of 1.77%.
Square: $3.96 flat, an effective rate of 2.2%.

The ranking has completely flipped. At $180, eWAY is now clearly the cheapest, and Square — the winner on the $12 sale — is the most expensive of the three. Neither gateway is objectively “cheaper.” The honest answer is that the cheapest gateway is a function of your average order value, and any business shopping on headline percentage alone is comparing the wrong number for its own business.

The practical takeaway: pull your last three months of sales data and calculate your genuine average order value, not a guess. If it sits below roughly $20-$25, weight your comparison toward flat-percentage, no-fixed-fee pricing like Square’s. If it sits comfortably above $50-$60, a low-percentage-plus-flat-fee structure like eWAY’s or WooPayments’ will usually win outright.

The Costs That Don’t Show Up on the Rate Card

A genuinely cheap gateway can still turn expensive once you look past the headline transaction fee, and small businesses are the ones who feel this most, because a fixed cost that’s trivial for a large retailer can be a meaningful chunk of margin for a store doing a few thousand dollars a month.

Watch for monthly minimum processing fees, common on some traditional bank merchant facilities, where you’re charged a set amount if your total processed volume doesn’t clear a threshold in a given month — a real risk for a seasonal business with quiet months. Watch for chargeback and dispute fees, typically charged per disputed transaction regardless of whether you win or lose the dispute, which reward a business that keeps its refund policy generous and its fraud screening tight. Watch for PCI compliance fees, an annual or quarterly charge some providers levy to cover the cost of card-data security compliance — usually modest, but worth confirming up front rather than discovering on your first invoice. And watch for early termination or account-closure fees on any provider that asks you to sign a fixed-term contract; every gateway named in this guide is currently no-lock-in, which is precisely why they dominate the small-business shortlist over legacy bank merchant facilities that still favour contracts.

None of these costs are dishonest, exactly — they’re usually disclosed somewhere in the terms. But “somewhere in the terms” is not the same as “on the page you compared before signing up,” and a genuinely cheap gateway is one where you’ve checked all four before committing, not just the transaction rate.

Beyond the Rate Card: Negotiating Your Way to a Lower Rate as You Grow

Most of the flat, published rates in this guide are exactly that — a flat rate, quoted publicly, with limited room to move for a business processing a few thousand dollars a month. That changes once your volume grows. Providers built around interchange-plus or cost-plus pricing, like Airwallex and some enterprise tiers of the bigger gateways, will negotiate their margin down once your monthly processed volume reaches a level worth retaining as a customer for — often somewhere in the tens of thousands of dollars a month, though the exact threshold varies by provider and is rarely advertised.

If you’re approaching that kind of volume, it’s worth the ten-minute phone call: ask your current provider directly what rate they can offer at your actual volume, and get a competing quote from at least one alternative gateway before you accept the first number. Providers would rather retain a growing merchant at a slightly thinner margin than lose the account entirely, and that leverage only exists if you actually ask.

Why “Cheapest” Just Became a Permanent Decision, Not a Pass-Through One

For a small business, this makes the gateway decision this guide walks through considerably higher-stakes than it used to be. A 1-percentage-point difference between two gateways used to be something you could shrug off with a surcharge line. From October, it’s a permanent line inside your margin on every single sale, for as long as you keep that provider — which is exactly why doing the average-order-value maths above, and checking the hidden costs, is worth an afternoon of your time rather than a five-minute glance at a pricing page.

Your Decision Framework: Which Gateway Is Actually Cheapest for Your Business?

Work through these questions in order, using your own numbers rather than a competitor’s or a case study’s. Each one narrows the field.

Question 1: What is your genuine average order value, calculated from real sales data?

Not a guess — pull the actual number from your last three months of transactions. Liam, who runs a small print-on-demand poster shop with an average sale under $20, should be weighting his comparison toward Square’s flat percentage. Olivia, whose furniture restoration business averages $220 a sale, should be weighting hers toward eWAY or WooPayments’ lower percentage plus flat fee.

Question 2: Are you invoicing clients directly, or running a full e-commerce checkout?

A service-based business like Ethan’s bookkeeping practice, which sends clients an online invoice rather than running a storefront, is better served comparing Zeller’s virtual terminal pricing than a full e-commerce gateway built for cart-based checkouts.

Question 3: How much of your revenue is genuinely international, or in a foreign currency?

If your answer is under 5%, don’t let a multi-currency-focused provider’s pricing distract you from the domestic rate that matters most. If it’s meaningfully higher, like Ava’s homewares business sourcing stock from three overseas suppliers and selling into two export markets, Airwallex’s tighter FX markup is likely to outweigh a marginally lower domestic card rate elsewhere.

Question 4: What monthly volume are you actually processing — and is it enough to negotiate?

If you’re processing a modest, steady monthly volume, take the best published flat rate and move on; negotiation rarely moves the needle at that scale. If you’re approaching real volume, like Mason’s growing homewares brand now clearing six figures a month, it’s worth the phone call before you accept any provider’s default rate.

Question 5: Have you actually checked for monthly minimums, chargeback fees and PCI charges — or just the headline rate?

Before you sign anything, ask each shortlisted provider directly for all four numbers: the transaction rate, the monthly minimum (if any), the chargeback fee, and the PCI compliance fee. A gateway that won’t give you a straight answer on all four is telling you something about how it prices the rest of its business too.

Compliance Still Sits With You, Whichever Gateway You Choose

Your Gateway Cuts Domestic Costs — Your Supplier Payments Are a Separate Battle

Everything in this guide is aimed at shaving basis points off what you pay to accept a customer’s card. But for a growing number of Australian small businesses — particularly the ones importing stock, as Ava’s homewares example above does — the bigger cost isn’t what you’re charged to accept payments, it’s what you lose converting Australian dollars into the currency your overseas suppliers actually get paid in. Every gateway fee you’ve optimised in this guide can be undone several times over by an unfavourable FX rate on the other side of your ledger.