WHICHpos › Guides › Processor lock-in
What is payment-processor lock-in?
The short answer
Payment-processor lock-in means a POS only works with the vendor's own card processing, so you can't shop for a lower rate. It matters because processing is 70–85% of a POS system's lifetime cost — losing the ability to negotiate it costs far more than any monthly software fee.
Fully locked: Square, Toast, SumUp. Clover devices are permanently tied to the processor that provisioned them. Lightspeed charges about $400/month to use a third-party processor. Shopify adds 0.6–2% per sale if you don't use Shopify Payments. No lock-in: JET POS and other open systems work with any processor.
Why lock-in is the costliest fine print in POS
When a POS is locked to its own processing, the vendor sets your rate and you have no leverage. Because the only negotiable layer of a processing fee is the processor's markup, lock-in removes the one cost you could have controlled. At $20,000/month in card sales, even a half-percent difference is about $1,200 a year — and you can't shop for it.
Who locks you in (2026)
| System | Lock-in | What it means |
|---|---|---|
| Square | Full | Hardware and software only run on Square Payments. Flat, non-negotiable rate at small volume. |
| Toast | Full | Toast Payments is mandatory, on a 2-year contract. |
| SumUp | Full | SumUp processing only. |
| Clover | Device-locked | Each device is permanently tied to the processor that provisioned it; switching usually means new hardware. |
| Lightspeed | Penalty | About $400/month surcharge to use a third-party processor instead of Lightspeed Payments. |
| Shopify | Penalty | Adds 0.6–2% per transaction if you don't use Shopify Payments. |
| JET POS | None | Bring any processor; negotiate your own rate. |
How to spot lock-in before you sign
- Ask directly: "Can I use my own payment processor, and what changes if I do?" A penalty or a flat 'no' is lock-in.
- Check whether the hardware survives a switch. Clover devices generally don't; open Android stations do.
- Read the contract for a processing exclusivity clause and an early-termination fee.
- Beware 'free' hardware — it's almost always subsidised by locked, higher-margin processing.
Frequently asked questions
What is payment processor lock-in?
It's when a POS system only works with the vendor's own card processing, so you can't switch processors or negotiate your rate. Square, Toast and SumUp are fully locked; Clover is device-locked; Lightspeed and Shopify charge penalties for third-party processing.
Why does processor lock-in matter so much?
Because processing is 70–85% of a POS system's lifetime cost and the processor's markup is the only negotiable part. Lock-in takes away your ability to shop that markup, which usually costs far more than any monthly software fee.
Which POS systems have no processor lock-in?
Open systems let you bring any processor. JET POS has no lock-in; some other open Android-based systems do too. With these you can negotiate interchange-plus pricing independently of the POS.
Is Clover locked to one processor?
Effectively yes. Clover hardware is provisioned to a specific processor (Fiserv or a reseller) and is permanently tied to it. Switching processors generally means buying new hardware, and reseller contracts often run 3–4 years.
Can I switch processors without changing my POS?
Only on an open POS. If your system is locked or device-locked, switching processors usually means new hardware too. That's why processor freedom is worth checking before you buy, not after.