Payments · Flat-Rate Processors
Square Review
Flat-rate payments and POS, the default for small service businesses
Quick verdict
Square is best for Solo and low-to-mid-volume service businesses that want the simplest possible setup with predictable flat-rate pricing and free hardware. Flat-rate is the most expensive model at higher volume; 2026 online-rate increase; known for fund holds/account freezes on flagged accounts.
Rates & pricing
Flat-rate. In-person 2.6% + 15¢ (free plan); online/invoice 3.3% + 30¢; keyed/card-on-file 3.5% + 15¢. Paid plans ($49/mo and $149/mo per location) lower in-person rates to 2.5% and 2.4%. No monthly fee on the free plan.
Pricing model: flat rate · Monthly fee: $0 (free plan); $49 or $149/mo for lower rates
Affiliate disclosure: No confirmed affiliate program — we currently earn nothing from Square.
About Square
Square is the default payment processor for small service businesses — a flat-rate, no-monthly-fee system that's genuinely easy to set up, with free card readers, invoicing, and a POS app that works out of the box. Founded in 2009 in San Francisco, it removed the friction of traditional merchant accounts (no application gauntlet, no statements full of mystery fees) and made card acceptance something a solo contractor can turn on the same day.
For trades, Square's appeal is simplicity and ubiquity: predictable flat rates, free hardware to start, built-in invoicing with card-on-file, and tight ties to the broader Square ecosystem (banking, payroll, loans). Many FSM tools also integrate with it. In-person cards run 2.6% + 15¢ on the free plan, with paid plans ($49/$149 per month per location) buying lower in-person rates for higher-volume shops.
The trade-offs are cost at scale and a recent rate hike. Flat-rate pricing is the most expensive model once you process meaningful volume — interchange-plus (Helcim) or subscription pricing (Stax) usually beats it above roughly $10K-$25K/month. And in January 2026 Square raised free-plan online/invoice rates from 2.9% + 30¢ to 3.3% + 30¢ (a 14% increase), which drew criticism and matters for contractors who invoice a lot online. Square is also known to hold or freeze funds on accounts it flags as risky. For a low-to-mid-volume shop that values simplicity, Square is the easy default; high-volume shops should price-compare the alternatives.
How it works
You sign up online with no traditional merchant-account application, get free or low-cost card readers, and can accept payments the same day — in person (tap/dip/swipe), online, via invoices, or keyed/card-on-file. Pricing is flat-rate per transaction with no monthly fee on the free plan, so what you see is what you pay; paid plans lower in-person rates. Money typically lands in your bank in 1-2 business days (or instantly for a fee). Square also bundles invoicing, a POS app, and add-ons like banking, payroll, and capital loans, and integrates with many field-service tools, so a contractor can run payments and adjacent tasks in one ecosystem.
Pros & cons
What works
-
Easiest setup in payments
No merchant-account application or underwriting gauntlet — sign up online and accept cards the same day with free or cheap hardware. For a solo contractor, that frictionless start is the whole appeal.
-
Predictable flat-rate pricing, no monthly fee
Flat rates with no monthly fee on the free plan mean no mystery statements or hidden line items. You always know your cost per transaction, which is rare in payments.
-
All-in-one ecosystem
Invoicing, POS, card-on-file, plus optional banking, payroll, and capital loans live in one ecosystem, and many FSM tools integrate with Square — convenient for a small shop that wants fewer vendors.
-
Free hardware and invoicing
A free mobile reader and built-in invoicing (with saved cards for recurring/maintenance billing) cover the core needs of a service business without extra cost to start.
-
Ubiquitous and trusted
Square is a known, widely-trusted brand, so customers recognize it and contractors can find help, integrations, and documentation easily.
What doesn't
-
Most expensive model at volume
Flat-rate is the priciest pricing model once you process real volume. Above roughly $10K-$25K/month, interchange-plus (Helcim) or subscription pricing (Stax) typically beats Square materially — model your effective rate.
-
2026 online rate increase
In January 2026 Square raised free-plan online/invoice rates from 2.9% + 30¢ to 3.3% + 30¢. For contractors who invoice heavily online, that 14% jump is a real cost increase worth reacting to.
-
Fund holds and account freezes
Square is known to hold or freeze funds on accounts its risk system flags, sometimes with little warning. For a contractor depending on cash flow, an unexpected hold is a serious risk.
-
Paid plans to get better rates
Lower in-person rates require the $49 or $149/month plans. Once you're paying monthly for rate reductions, it's worth comparing against interchange-plus or subscription processors.
-
Less suited to high-ticket invoicing
On big-ticket jobs (HVAC replacements, roofs), a percentage-based flat rate gets expensive fast. ACH or interchange-plus/subscription models save meaningfully on large invoices.
Features & integrations
Key features
Integrations
Frequently asked
What are Square's payment processing fees?
On the free plan: in-person 2.6% + 15¢, online/invoice 3.3% + 30¢ (raised from 2.9% + 30¢ in January 2026), and keyed/card-on-file 3.5% + 15¢. Paid plans ($49/mo and $149/mo per location) lower in-person rates to 2.5% and 2.4%. There's no monthly fee on the free plan.
Is Square the cheapest payment processor for contractors?
Only at low volume. Flat-rate pricing is simple but the most expensive model as you scale — above roughly $10K-$25K/month in card volume, interchange-plus (Helcim) or subscription pricing (Stax) usually saves meaningful money. Square wins on simplicity, not on price at scale.
Does Square hold or freeze funds?
It can. Square is known to hold or freeze funds on accounts its risk system flags, sometimes with little warning, which is a real cash-flow risk for contractors. If you process large or irregular amounts, it's worth understanding Square's risk policies and keeping a backup processor or buffer.
Should a contractor use Square or process payments through their FSM?
Many FSM tools (Jobber, Housecall Pro) have built-in payments at similar flat rates, which keeps everything in one system. Square makes sense if you want a standalone, ubiquitous processor with a POS and ecosystem, or if your FSM's payment rates are higher. Compare effective rates and where you'd rather manage payments.
Is Square good for big-ticket jobs?
Less so. On a $15,000 HVAC or roofing invoice, a 3.3% online card fee is ~$495 — so for high-ticket work, ACH (bank transfer) or a cheaper processing model saves real money. Square supports ACH and invoicing, but high-ticket contractors should weigh interchange-plus or subscription processors that lower the percentage cost.