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.
Square, Toast and SumUp are fully locked. Clover devices are permanently tied to the processor that provisioned them. Lightspeed charges about $400/month to use a third-party processor, and Shopify adds 0.6–2% per sale if you don't use Shopify Payments. JET POS and other open systems work with any processor, with no lock-in.
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 nothing to bargain with. 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.
- Be wary of 'free' hardware. It's almost always subsidized 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.