Mobile customers do not need a perfect checkout. They need one that is clear, quick and easy to complete on a small screen.
The biggest checkout problems are usually straightforward: unexpected costs, too many steps, limited payment options, slow or awkward mobile pages, and error messages that do not explain what went wrong. Any one of these can interrupt a purchase when a customer is already close to paying.
For ecommerce businesses, improving ecommerce payments is therefore not only about adding another payment method. It means looking at the whole journey from basket to confirmation and removing avoidable reasons a customer stops.
Baymard Institute’s 2026 US checkout research found that, excluding shoppers who were browsing, common reasons for cart abandonment included high extra costs, lack of trust, forced account creation and a checkout that felt too long or complicated. While these figures aren’t UK-specific or limited to mobile shoppers, they are useful indicators of where checkout friction often appears.
1. Unexpected costs appear too late
A customer may be happy with the product price and still abandon the purchase when delivery charges, taxes or other fees appear at the final stage.
Baymard’s 2026 research found that 40% of surveyed US shoppers who abandoned for reasons other than simply browsing cited extra costs such as shipping, tax or fees as a reason.
The lesson for ecommerce businesses is not that every charge must disappear. Delivery and other legitimate costs are part of many online purchases.
The problem is surprise.
On mobile, where customers have less screen space and may move quickly through the journey, important cost information can be easy to miss. Make delivery charges, minimum-order requirements and other unavoidable costs visible as early as practical. If the final total changes, the customer should understand why before paying.
A useful test is simple: if a shopper reaches the payment stage, will the amount due match what they reasonably expected a few steps earlier?
2. The checkout asks customers to do too much
A long checkout can make a simple purchase feel like an administrative task.
Customers may be asked to create an account, choose a password, provide information the business doesn’t actually need, move through several pages, and repeatedly confirm details. On a phone, every additional field means more tapping, typing and opportunities to make a mistake.
Baymard’s 2026 abandonment data found that 18% of relevant respondents cited being required to create an account, while 17% cited a checkout that was too long or complicated. Its checkout guidance also recommends making guest checkout easy to find rather than forcing account creation before purchase.
This does not mean businesses should never encourage customer accounts. An account can make future orders easier and support useful features such as order history. But checkout is usually the wrong moment to make registration an obstacle.
Review every field in your mobile checkout and ask whether you genuinely need it to process the order. If account creation is useful but not essential, let customers create one without blocking the purchase.
3. The payment options do not match how customers already pay
Mobile shopping should not end with a payment experience designed mainly for desktop users.
A customer who regularly uses a digital wallet may prefer not to find their physical card and type a long card number, expiry date and security code into a phone. If the only available method creates more effort than the customer expected, the final payment step becomes harder than it needs to be.
UK Finance reported in August 2026 that 65% of UK adults were registered for at least one mobile payment service in 2025, up from 57% in 2024. Cards accounted for 64% of all UK payments in 2025. Those figures do not mean every ecommerce business should offer every wallet or payment method. Still, they show how established mobile and card-based payment behaviour has become in the UK.
The right payment mix depends on your customers, average order value, products and payment provider. Review your checkout data rather than adding options simply because they exist. The aim is to give customers useful choice without turning the payment screen into a crowded list.
For businesses reviewing their ecommerce payments, cards and digital wallets should be considered together as part of the wider checkout experience, not as completely separate journeys.
4. The mobile checkout is slow or awkward to use
A checkout can be logically simple and still be frustrating if the page is slow, buttons are difficult to tap or content moves around while it loads.
Google’s current Core Web Vitals guidance measures three aspects of user experience: loading performance, responsiveness and visual stability. It recommends a Largest Contentful Paint of 2.5 seconds or less, Interaction to Next Paint of 200 milliseconds or less, and a Cumulative Layout Shift score of 0.1 or less at the 75th percentile of page loads.
Those measures are technical, but the customer experience behind them is easy to understand. A payment button should respond when tapped.
The checkout shouldn’t jump when the customer tries to select an option. Important information should not take so long to appear that the page feels broken.
Test the actual checkout on several mobile devices rather than relying only on how it looks in a desktop browser. Complete a purchase yourself using mobile data, not just fast office Wi-Fi. Pay attention to loading, keyboard behaviour, field sizes and whether the customer can comfortably review the order before paying.
5. Error messages leave customers guessing
Something will occasionally go wrong during checkout. A postcode may be incomplete, a required field may have been missed, or a payment may not go through.
The problem gets worse when the customer is told only that there is an “error”.
W3C accessibility guidance says that when an input error is automatically detected, the affected item should be identified and the error described in text. That principle is useful beyond accessibility compliance: customers need to know what went wrong before they can fix it.
Instead of a vague message such as “Payment unsuccessful”, give the customer useful information where it is appropriate and safe to do so. If a form field needs attention, identify it clearly. Keep information already entered wherever possible rather than making the customer start again.
For payment failures, the exact message available may depend on the payment provider and reason for the decline. The checkout should still make the next step clear, whether that means checking entered details, trying another available payment method or contacting the business for help.
A better mobile checkout removes reasons to stop
Not every abandoned basket can be recovered. Some customers compare prices, save products for later, or change their minds.
The part ecommerce businesses can influence is unnecessary friction.
Start by completing your own checkout on a phone and looking for the five problems above. Are unexpected costs appearing late? Are you asking for information you do not need? Can customers use payment methods that suit mobile shopping? Does the checkout load and respond reliably? And if something goes wrong, does the customer know what to do next?
Improving ecommerce payments often comes down to those practical details. The easier it is for a customer who has already decided to buy to complete the final steps, the less likely the checkout is to become the reason they leave.
