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Search for the cheapest POS system and you will find a lot of $0 headlines. Almost none of them are wrong, exactly, and almost none of them are the real number either. The software is free because the processing is not.
This article works out what a small restaurant actually pays, and then covers the options that are genuinely cheap rather than cheap-looking.
Work out your real cost first
The formula that matters is simple:
Monthly cost = software fee + (monthly card volume × processing rate) + hardware amortised over its life
For a small restaurant taking $25,000 a month on card, at a fairly typical 2.6% plus 15¢ per transaction across roughly 900 transactions, processing alone is about $785 a month. A $0 software plan and a $69 software plan differ by less than 9% of that.
| Monthly card volume | Processing at 2.6% | Processing at 2.4% | Annual difference |
|---|---|---|---|
| $15,000 | ~$390 | ~$360 | ~$360 |
| $25,000 | ~$650 | ~$600 | ~$600 |
| $40,000 | ~$1,040 | ~$960 | ~$960 |
| $60,000 | ~$1,560 | ~$1,440 | ~$1,440 |
Figures exclude per-transaction fees and are rounded for illustration. The point is the shape, not the decimals: a fifth of a percent on your rate is worth more than most software plans, every single year.
The four ways to run a POS cheaply
1. Free tier from a major vendor
Square and Toast both offer $0 software tiers. This is the lowest-friction option and it works. You pay for it through a higher processing rate, and you accept that your POS and your processor are the same company for as long as you stay. For a small restaurant with modest card volume, the maths is often perfectly reasonable. See our Square vs Toast comparison for the trade-offs.
2. Free and open-source software
Open-source POS software is free in a more literal sense: no software fee, no vendor tie, and the source code is available. Floreant POS has been downloaded over 122,000 times and runs on Windows, Mac, Linux and Raspberry Pi. Siiopa is aimed at smaller single-terminal shops and installs in minutes.
The trade-off is support. There is no account manager. You configure it, and if something breaks at 8pm you are troubleshooting it or paying someone hourly. For an owner-operator who is comfortable with computers, this is the cheapest genuine option available. Our guide to free POS software for restaurants covers what to expect.
3. Paid software, independent processor
The often-overlooked middle path: pay a modest software fee for a system that does not lock you to one processor, then negotiate your merchant account separately. This is more work up front and it is usually the cheapest option at volume, because you can re-quote your processing every year or two without changing your POS.
4. Buy used hardware, run free software
Terminals, printers and cash drawers hold up well and appear regularly on the second-hand market when restaurants close or upgrade. Pairing refurbished hardware with free software is the lowest-capital route into a working system. Check our POS hardware guide for what to inspect before buying used.
What "cheap" costs you
It would be dishonest to present the free options as free of downside. Realistically:
- Support is on you. Free software has community forums, not a support line. Budget either your own time or an hourly IT contact.
- Setup takes longer. Expect a day or two to configure menus, printers and tax properly, versus a few hours with a guided commercial onboarding.
- Integrations are fewer. Delivery platform integrations and loyalty programmes are where paid systems earn their fee.
- You own the backups. Nobody else is protecting your sales history. Set this up on day one, not after the first hard drive failure.
Hidden costs that make a "cheap" system expensive
Three costs routinely appear after the decision is made, and none of them show up in a pricing comparison:
Per-transaction fees on small tickets
A 15¢ per-transaction fee is trivial on a $60 dinner bill and brutal on a $3.50 coffee. At 400 coffees a day, that flat fee alone is roughly $1,800 a year, and it is invisible in a headline percentage rate. Cafes and quick-service operations should weight the flat fee far more heavily than the percentage.
Monthly minimums and PCI fees
Merchant accounts frequently carry a monthly minimum, a PCI compliance fee, a statement fee and an annual fee. Individually they are small. Together they often add $30–$60 a month that no comparison table mentions. Ask for a full fee schedule in writing, not a rate.
The cost of switching later
If your POS locks you to one processor, the cost of a bad rate is not just this year’s difference. It is that difference compounded for as long as it takes you to replace the entire system. That is the real reason processor independence is worth paying a small software fee for.
A worked example
A 30-seat neighbourhood restaurant does $28,000 a month on card across roughly 950 transactions. Compare two realistic setups over three years:
| Free tier, bundled processing | Free software, own merchant account | |
|---|---|---|
| Software | $0 | $0 |
| Processing rate | 2.6% + 15¢ | 2.3% + 10¢ (negotiated) |
| Monthly processing | ~$871 | ~$739 |
| Monthly account fees | $0 | ~$40 |
| Setup effort | A few hours | One to two days |
| Three-year total | ~$31,356 | ~$28,044 |
The gap is roughly $3,300 over three years, on a restaurant that is not large. It comes almost entirely from 0.3% on the rate and a slightly better per-transaction fee — not from the software, which was free in both columns. Scale the volume up and the gap scales with it.
What we would actually recommend
- Under $10,000 a month in card volume: take a free tier from a major vendor, or run free open-source software if you are technically comfortable. Processing differences are too small to justify effort.
- $10,000–$40,000 a month: this is where it starts paying to control your own processing. Free or low-cost software with an independent merchant account is usually cheapest over three years.
- Above $40,000 a month: negotiate. At this volume processors will compete for you, and a POS that lets you switch is worth real money. Do not sign anything multi-year on subsidised hardware.
Whichever tier you are in, the single highest-value thing you can do is re-quote your card processing once a year. It takes an afternoon and it is usually worth more than every other cost saving in this article combined. If you want to see how the pieces connect, our guide to POS system software covers what the system should be doing for you day to day.