Card Payment Costs for Market Traders and Events
Compare seasonal card-payment costs using trading days, quiet months, equipment and the connectivity needed at each pitch.
The short answer
For markets and events, calculate the full trading year rather than multiplying one busy month by twelve. Fixed subscriptions can continue between events. Include readers, connectivity and any required software, then compare the actual sales pattern.
In this guide
Start with the event calendar
List expected events and realistic sales for each. Separate repeat markets from occasional larger festivals, and identify whether the same devices serve every event or several teams trade at once.
A plan that saves money during the busiest month may still cost more over the year if subscriptions continue through inactive periods. Ask whether pausing or cancelling is allowed, when it takes effect and whether a new term starts when you return.
Count card sales only, and keep pitch rent, travel and stock costs in the wider event budget. They affect profitability but should not be confused with the cost of accepting payment.
A seasonal comparison
Fictional seasonal trader. Six active months produce £5,000 card sales each, followed by six months with no sales. Offer A is 1.6% with no monthly fee. Offer B is 1% plus £20 every month.
| Annual component | Offer A | Offer B |
|---|---|---|
| Processing on £30,000 | £480 | £300 |
| Twelve monthly fees | £0 | £240 |
| Annual total | £480 | £540 |
B saves £10 during each active month but costs £60 more over the full year. If the contract genuinely allowed charging for active months only, B would instead total £420. That alternative must be confirmed, not assumed.
Check the equipment at the actual pitch
- Confirm mobile coverage and any Wi-Fi limitations at the venue.
- Choose the necessary phone-based or standalone device arrangement.
- Plan charging, battery capacity and a practical backup.
- Check how receipts are issued and how several volunteers or staff access the system.
- Ask the provider what offline operation, if supported, permits and what risk remains.
SumUp’s card-machine material describes different portable setups. Compare the requirements of the device you are considering, including whether it needs another phone or tablet and a separate connection.
Keep one-off and recurring costs separate
Record reader purchases, accessories and any required software. If several traders share an event, clarify who owns each account and receives the funds. Do not assume an account intended for one business can collect for unrelated sellers.
Use the actual tariff for your card mix. An event attracting overseas visitors may have a different processing profile from the weekly local market. If there is a per-payment charge, count completed transactions rather than items sold.
Add refund handling and settlement conditions to your questions. Those details matter when an event is cancelled or customer orders are fulfilled later.
Compare over the period you will trade
Use the seasonal card payment cost calculator to enter twelve individual months, including inactive periods. Compare actual monthly cost totals or a simple tariff, then add annual and future one-off costs only where they are not already included. The main calculator remains useful for a representative-month comparison.
Start with pay-as-you-go versus monthly plans, then review SumUp versus Square using your own equipment requirements. Include all months for which you are contractually committed.
Common questions
Should I multiply my best market month by twelve?
No. Use a realistic trading calendar, including quiet and inactive months and any fixed charges that continue.
Can I assume the subscription stops when I stop trading?
No. Check cancellation or pause terms, notice and billing dates in the agreement.
Put your own figures to work.
Use the free calculator to organise your costs and keep a report. If something is unclear, you can ask for a free initial review.
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Sources and how to use this guide
Primary references checked on 15 October 2026:
Worked examples are original fictional scenarios, not customer results, market averages or provider quotations. Unless stated otherwise, they use a consistent VAT basis and include only the costs listed. Provider prices, eligibility and terms can change. Check your written agreement before deciding.
Our guides explain costs and comparison methods. They do not rank the whole market or claim hands-on product testing. Source links are references, not a claim of partnership. Read the calculation method and limitations, or about the service.