Honesty box payment systems: cash, QR codes, card machines and apps compared
By CharlenePublished 9 min read
For a roadside egg stand, the best honesty box payment system is usually a cash tin plus a QR code that takes card payments on the customer’s own phone. For a lockable farm shop with regular local customers, a system where the customer is known before they pay (an app that opens the door, or a self-checkout behind access control) loses far less stock. A standard card machine left on the counter looks like the obvious upgrade, but it is built for staffed tills and is the weakest fit for unattended selling.
Whatever you choose, keep cash as a fallback. UK Finance reports that cash made up only 8% of UK payments in 2025, down from 45% in 2015, yet only 29% of over-65s were registered for a mobile wallet, against 65% of all adults (UK Finance, August 2026). A lot of honesty box customers are exactly that older, rural group.
What counts as an honesty box payment system?
An honesty box payment system is any way for customers to pay for goods at an unstaffed stall or shop without a seller present. The options run from a locked cash tin, through bank transfer details, QR codes and card readers, to self-checkout kiosks and shop apps. They differ in three ways: how much stock leaves unpaid for, how much counting and checking you have to do, and how easy paying is for the customer.
There is no legal requirement in the UK to use a till for a small farm-gate stall. You do need records of what you take, for tax (more on that below).
The six options
1. The cash tin
A tin is cheap, everyone understands it and there are no fees. The problems are just as familiar: you only ever count what is in the tin, not what should be in it, the tin itself gets stolen, and someone has to empty it daily, keep change in it and bank the takings. If the tin is the part that keeps disappearing, our article on honesty box theft goes through what actually helps.
2. Bank transfer details
A sign with your sort code and account number costs nothing to put up, though some business accounts charge for incoming payments. In practice few people stand at a stall typing in eight digits and a sort code. Reconciling it is also fiddly: you get a column of “EGGS” references and have to match them to what left the shelf. It works as a third option on the sign, but rarely as the main one.
3. A QR code to a payment page
The customer scans a code on the sign, a payment page opens, they choose the item or enter an amount and pay with Apple Pay, Google Pay or a card. There is nothing to charge and nothing to steal apart from the laminated sign.
The best-known UK service built for this is honestybox.app. As of September 2026 it charges 5% per transaction plus Stripe fees of 1.5% + 20p, with no hardware or monthly fee (honestybox.app). Its own example: on a £5 sale you pay about 53p in total and keep £4.47. That is roughly 10.5% on small sales, because the fixed 20p weighs heavily on a box of eggs. On a £20 basket the total is £1.50, or 7.5%.
You can build something similar yourself with a payment link from Stripe, SumUp or a similar provider and a printed QR code, which cuts the platform fee but means you set up and maintain the page. Either way payment is still voluntary: nothing checks that the person who took the jam actually paid.
One practical warning: stick the code on firmly and check it regularly. Pasting a fake QR code over a real one is a known scam, and an honesty box sign is an easy target.
4. A card machine at the stall
A basic reader is cheap to buy. SumUp’s pay-as-you-go rate in the UK is 1.69% per in-person card payment, or lower rates on its £19-a-month Payments Plus plan (SumUp pricing). The PayPal Reader (formerly Zettle) costs £29 excluding VAT for a new business, with 1.75% per card transaction (Zettle pricing). Fees as of September 2026.
Neither reader is sold as an unattended device. They are designed for a trader who keys in the amount and hands the reader over. At an honesty box the customer has to enter the price themselves, the reader needs charging and a signal, and a small device worth tens of pounds is sitting unattended on a shelf. We could not find a published policy from SumUp or PayPal on unattended use, so ask before you rely on it. Other providers are explicit: Stripe says its standard readers are for attended and semi-attended settings and offers one separate device for unattended ones (Stripe Support). Purpose-built unattended terminals exist, the kind fitted into vending machines, but they cost considerably more and usually come through a vending supplier.
5. A self-checkout kiosk
A screen with a scanner and a built-in card terminal, often in a timber housing by the door. The customer scans or selects items and pays by card or phone. You get proper per-product sales data, which helps with stock and pricing. Costs run well above the other options (hardware, installation, a software subscription and terminal fees), and prices are rarely published, so get several quotes and ask what happens when it breaks on a Saturday. A kiosk does not stop theft on its own: anyone who doesn’t scan doesn’t pay. It works best with a door that only opens for known customers.
6. Paying in the shop’s own app
The customer downloads the shop’s app, uses it to open the door, picks or scans items and pays before leaving. Because they identified themselves to get in, you know who was in the shop and when. Customers know that too, and it does more to make them pay than any sign. (It is also what we are building Hylle to do: a branded app per shop, with door access and payment on the phone, no till or card machine.)
Passing trade won’t install an app for one jar of honey, and you pay a software subscription plus payment fees. For a stall taking a few hundred pounds a month it is overkill.
Comparison table
Indicative, based on published fees as of September 2026. Hardware costs are rough ranges.
| Option | Upfront cost | Per-transaction cost | Admin for you | Theft risk | Customer friction |
|---|---|---|---|---|---|
| Cash tin | Under £50 (tin, lock, fixing) | None, but banking cash may cost | High: emptying, counting, change, banking | High: goods and the tin | Low with cash, impossible without |
| Bank transfer details | None | Depends on your bank | Medium: matching references | Medium: voluntary | High: typing sort code and account |
| QR payment page | None (honestybox.app) or set-up time | honestybox.app: 5% + 1.5% + 20p | Low: sales listed | Medium: voluntary | Low |
| Card machine | £29–£100-ish | SumUp 1.69%, PayPal Reader 1.75% | Medium: charging, signal, watching it | Medium to high: device can go | Medium: customer keys in amount |
| Self-checkout kiosk | Thousands (quote) | Terminal fees plus software | Low, apart from maintenance | Medium | Low |
| Shop app with access | Software subscription | Payment provider fees | Low | Low: customer is known | Low for regulars, high for passers-by |
What the fees look like on an egg box by the lane
These are illustrative figures, not an average. Say a stall makes 80 sales a month at £5 each, so £400.
- With honestybox.app: 5% (£20) plus Stripe at 1.5% + 20p per sale (£6 + £16) comes to £42 a month, about 10.5%.
- With a SumUp reader on pay-as-you-go: 1.69% of £400 is £6.76 a month, plus the reader, and the risk that it walks.
- With a cash tin only: nothing in fees, but if one sale in ten goes unpaid you lose £40 a month.
On small sums the unpaid sales cost about as much as the most expensive fee option. So a QR code pays for itself if it converts even a few would-be non-payers who had no cash on them.
What about tax?
Card and QR payments leave a clear record, which makes your accounts easier to keep and to check. If the stall is a side-line rather than part of an existing farm business, the trading allowance applies: up to £1,000 of gross trading income a year is tax-free. Above that you must register for Self Assessment, by 5 October after the end of the tax year (gov.uk: tax-free allowances). If you claim the allowance you cannot also deduct actual expenses, so a stall with high feed or packaging costs may be better off claiming expenses. For a farm, the stall’s takings simply belong in the farm accounts. This is general information, not tax advice.
In Ireland the same payment options exist, priced in euro, and Revenue has its own rules on side income, so check the Irish price pages and Revenue guidance rather than using the UK figures above.
Which system suits which set-up?
For a roadside stand with a handful of lines and a few hundred pounds a month, a cash tin plus a QR code for card payments is enough, and you are unlikely to earn back the cost of anything more.
Where theft keeps happening, consider a vending machine with lockers that only open after payment. That is a bigger investment, and our comparison of farm vending machines and honesty shops sets out the costs.
A lockable farm shop with regulars from the village is better off with a system where the customer is identified, through an app that also opens the door or a kiosk behind access control. You pay more each month, but you can open longer hours and you know who was in.
If you get a lot of walkers and holidaymakers, keep a second route open alongside any app, card or cash, because not everyone will download an app for one visit, and plenty of them will be over 65.
Whichever system you pick, count stock weekly for the first three months and compare it with what came in. That figure tells you what the system really costs. If you are still at the planning stage, the rest of the decisions are in our guide to starting an unstaffed shop.