Zeller and Square are the two names most Australian small businesses weigh up when they want simple card payments without a bank contract. Both are pay as you go, both skip monthly fees and lock-ins, and both ship hardware you can be trading on the same day. The difference comes down to the rate you pay, whether you can route debit taps to a cheaper network, and how much else you want the provider to do. Plans and pricing checked July 2026, and every figure below is pulled live from our pricing database.
Pricing and rates compared
Zeller's headline is a flat 1.4% in person, including on American Express at the same 1.4%, which undercuts Square's 1.6%. On a typical month of card takings that gap puts money back in your pocket before you count anything else, so a cafe or shop that takes most payments at the counter will usually pay less with Zeller. The calculator above turns that rate gap into a dollar figure for your own volume.
Online flips the comparison into a maths problem. Zeller charges 1.7% + $0.25 per transaction, while Square charges a flat 2.2%. There is a break even order value: above it Zeller is cheaper, below it Square's no fixed fee structure wins because the fixed 25 cent component hurts small baskets. The two providers cost the same at an order value of about $50, where Zeller's 0.5% rate saving exactly offsets its 25 cent fee. Above $50 Zeller pulls ahead, below it Square does. The calculator above lets you set your in person and online split and your average transaction so you can see which way your own numbers fall. Both providers refund chargebacks for free, so that is not a deciding factor between them.
What the rate gap means in dollars
Take a cafe putting $20,000 a month through the terminal. At Square's 1.6% that is $320 a month in card fees. At Zeller's 1.4% it is $280, a saving of $40 every month, or about $480 a year, for exactly the same transactions. The gap scales linearly: at $50,000 a month the difference is $100 a month, and at $10,000 it is $20. Least-cost routing on Zeller's debit taps, covered below, can widen that gap further.
Online, the maths depends on basket size. Zeller's rate plus fixed fee beats Square's flat rate once the order value clears about $50, so the percentage saving outweighs the fixed fee. A store full of small orders leans Square online; larger average orders lean Zeller. The calculator above does this arithmetic for your own volume and split, using the current rates from our database.
Least-cost routing: a Zeller-only cost lever
One difference the headline rates hide is least-cost routing. When a customer taps a debit card, the payment can travel over the international Visa or Mastercard network or over Australia's own eftpos network, and eftpos is usually the cheaper of the two for the merchant. Zeller supports least-cost routing and sends eligible contactless debit taps down the cheapest available network automatically. Square does not give merchants that routing control in Australia.
For a business where a large share of takings are debit tap and go, which covers most cafes, bakeries, convenience stores and grocers, that routing can pull Zeller's effective rate below its 1.4% headline on those transactions, a saving Square cannot match at any volume. If your customers mostly tap debit cards rather than credit, this alone can decide the choice. If they mostly pay by credit card, or a phone wallet loaded with a credit card, routing has less to work with and the headline rates matter more.
Who each one is built for
Zeller is the Australian all rounder. Alongside the terminal you get a free business transaction account and card, so it doubles as light banking, which appeals to owners who want their takings, account and card in one place at the lowest counter rate. Our full Zeller review breaks down the account and hardware in detail.
Square is the ecosystem play. The same account runs a free online store, invoicing, payment links, appointments and a full POS, so a business that sells across a counter and online, or wants one system for everything, gets more from Square even at the slightly higher in person rate.
Which fits a cafe, a retail shop, or a market stall
For a cafe or restaurant, Zeller's flat 1.4% on every card including Amex usually wins, because hospitality takes nearly everything at the counter, Amex acceptance without a rate penalty matters to diners, and least-cost routing quietly trims the debit taps. For a retail shop that also sells online, Square's combination of free online store, inventory and POS often justifies the premium over Zeller's counter rate. For a market stall or mobile business starting out, Square's cheap entry reader is the lowest-risk first step, and you can switch later because neither provider locks you in. You can also weigh both against every option in our full Australian payment provider comparison, and our POS system comparison covers the till side of that decision.
Hardware and terminals
Zeller's terminal is a full standalone device with its own screen and receipt options, and it costs current pricing. It works on its own, with no phone or tablet required. Square's tap to pay reader is the cheapest way in at current pricing, but it pairs to a phone or tablet running the Square app rather than standing alone. That is the trade off: Square is cheaper to start, while Zeller feels more like a dedicated till out of the box and needs no second device. Square also sells its own standalone Terminal and Register hardware higher up the range if you outgrow the reader. Both offer local Australian support, and neither charges a setup fee or a PCI compliance fee.
Australian support and settlement
Both are built for Australia and settle to an Australian bank account, with next business day settlement as standard. Zeller settles into its own bundled business account, which is part of why it appeals to owners wanting banking and payments together. Both provide local support, and neither ties you to a fixed term, so switching later is low risk. Settlement timing and support quality are close enough that they rarely decide the choice on their own.
Switching and getting started
Because there is no contract either way, moving is simple: order the hardware, create the account, and start taking payments, usually within a day. If you are leaving a bank terminal, keep it active for a short overlap so you are never without a way to take cards, then return it once your new device is settling reliably.
Pros and cons for this matchup
Zeller wins on the in person rate at 1.4%, Amex parity at the same rate, least-cost routing on debit, and the bundled business account, but starts dearer on hardware. Square wins on the cheapest entry reader and a far deeper online and POS ecosystem, but its 1.6% in person and flat 2.2% online cost more for counter heavy, larger ticket businesses, and it has no least-cost routing.
The verdict
If you take most payments at the counter and want the lowest rate, least-cost routing on debit, and a built in business account, Zeller is the pick. If you sell online as well as in person, or you want one provider for your store, invoices and POS, Square's ecosystem makes it the better all rounder despite the slightly higher in person rate. Set your real split and average transaction in the calculator above to confirm which is cheaper for you.