Best Mobile Card Machine for Small Business 2026

Small businesses that trade on the move face a payment problem most fixed-location shops never think about: connectivity. Whether you are working a market stall in a field, visiting clients at their homes, or running a mobile catering van, your card machine must work reliably away from a fixed broadband line. The reader also needs a battery that lasts a full working day, because there is rarely a convenient socket nearby.

Who Is This Page For?

This page is for small businesses that take card payments away from a fixed premises. That includes market traders, mobile beauticians, personal trainers, dog groomers, mobile caterers, tradespeople collecting payment on site, and anyone else who needs a card reader that works wherever they are, not just where the Wi-Fi is. If you run a fixed-location shop and want a countertop terminal instead, the best card machine for small business parent page covers a wider set of options.

Compare Card Fees is a free, independent advisory service that has helped UK businesses find better card payment deals since 2012. We cover around 90% of the UK's leading card payment providers. No provider pays to be featured.

Connectivity and Battery: The Two Things That Actually Matter When You Trade Off-Site

A mobile card reader that works perfectly in your living room can become unreliable in a field, a marquee, or a car park with weak 4G signal. Most compact readers connect via Bluetooth to your phone and piggyback on your phone's mobile data. That means your reader's performance depends entirely on your phone's signal, not the reader itself. If your phone drops to two bars, transactions can slow or fail. Some traders carry a dedicated 4G SIM device as a backup hotspot. It is an extra cost, but one failed transaction at a busy food market during the lunch rush costs more than a spare SIM card.

Battery life is equally concrete. Square's card reader is quoted at around eight hours of use. SumUp's Air reader is quoted at around 500 transactions per charge. Real-world performance is usually a little lower than manufacturer specs, particularly in cold weather. For a market trader working a 10-hour Saturday, that matters. Check recent user reviews on Trustpilot and app stores for the specific reader, not just the headline spec on the provider's website. A reader that dies at 3pm on a busy day is a business problem, not just an inconvenience.

Fee Comparison: Best Mobile Card Machines for Small Business

Our Top Pick for Mobile Small Businesses: SumUp

SumUp wins for most mobile small businesses because it directly addresses the two real constraints: it works via Bluetooth to your phone (so it goes wherever you go), and the SumUp One plan at 0.99% per transaction is the most competitive published pay-as-you-go rate available from a major UK provider. At £10,000 in monthly card turnover, SumUp One costs £99 in transaction fees plus £19 subscription, totalling £118. Square at 1.75% on the same volume costs £175. That is a £57 monthly saving, or around £684 a year, for a trader doing consistent volume.

The SumUp Air reader is compact enough to fit in a jacket pocket, which matters when you are setting up a gazebo at a craft fair or carrying equipment to a client's home. The app works on both iOS and Android and does not require a monthly software subscription for basic sales tracking. Settlement is typically the next business day into your nominated UK bank account.

The honest weakness: SumUp's customer support has attracted mixed reviews. Phone support is not always easy to reach quickly, and if your reader develops a fault mid-market-day, you may not get a fast resolution. Keep the SumUp app's keyed-entry option as a backup. Keyed transactions cost 1.69% (on pay-as-you-go) rather than the contactless rate, but taking payment is better than losing the sale entirely. Read the full SumUp review on Compare Card Fees for a complete breakdown of its plans and hardware.

Runner-Up Options

Square: Best for Very Low-Volume or Seasonal Mobile Sellers

Square charges 1.75% per UK card transaction with no monthly fee and a one-off £19 reader cost. For a mobile business that only takes card payments occasionally, say a photographer who collects a final payment on delivery a few times a month, Square makes more sense than SumUp One. You are not paying £19 a month for a subscription you barely use. The Square Point of Sale app also includes basic inventory and reporting tools at no extra cost, which suits sole traders who want simple records without a separate accounting subscription. The higher per-transaction rate becomes the trade-off as volume grows. See the full Square review on Compare Card Fees for hardware options and payout timing.

Zettle by PayPal: Best If You Already Use PayPal for Online Sales

Zettle charges 1.75% per transaction with no monthly fee, matching Square's rate. Its hardware has a strong reputation for reliability, and the Zettle app is well-regarded for stock management. The specific reason to consider Zettle over Square as a mobile trader is PayPal integration. If you already invoice clients via PayPal or sell through an online shop that uses PayPal as a checkout, consolidating your in-person and online payments under one login simplifies your reconciliation at month end. The honest downside is that there is no published volume discount. A mobile business doing £5,000 a month in card sales pays 1.75% indefinitely. SumUp One's 0.99% rate will beat Zettle on cost at any meaningful volume. Read the Zettle review on Compare Card Fees for a full picture of its features and limitations.