Switching from Square to a merchant account is worth it when your customers mostly pay with cheap cards, and far less so when they pay with premium rewards cards. That is the part the "switch once you hit $10,000 a month" rule leaves out. Square charges everyone 2.6% + 15 cents in person on its Free plan, whatever card is used. A regulated debit card costs about 0.05% + 22 cents wholesale, and a Visa Signature Preferred card costs 2.10% + 10 cents. Same Square fee, very different overcharge.
This post runs the numbers on Visa's April 2026 interchange table, so you can see which side of that line your business sits on before you take a sales call. If you want the maths for your current statement first, our guide on how to calculate your effective rate does that in five minutes. Square's full rate card is on our Square fees page.
What are you actually paying on Square?
On Square Free you pay 2.6% + 15 cents for tapped, dipped or swiped cards, 3.3% + 30 cents for online and invoice payments, and 3.5% + 15 cents for keyed cards. Those are from Square's own fee page, checked on 2026-09-28. Square Plus drops in-person to 2.5% + 15 cents and online to 2.9% + 30 cents for $49 a month per location. Square Premium drops in-person to 2.4% + 15 cents for $149 a month per location.
At least one page ranking for this question still quotes Square at 2.6% + 10 cents. That was the old rate. At 15 cents, the fixed part of the fee alone is 1.5% of a $10 sale.
What Square does not charge matters just as much. Its fee page lists no fees for PCI compliance, chargebacks, account inactivity or early termination, so a lower rate elsewhere is not automatically a lower bill.
Why the answer depends on your card mix
A flat rate overcharges cheap cards and undercharges expensive ones. With interchange-plus, you pay the card's wholesale cost plus a fixed markup, so your bill follows your customers' cards.
The wholesale costs come from Visa's interchange table effective April 18, 2026. Debit cards from big banks are capped by federal rule at 21 cents + 0.05% (the current text of Regulation II), plus 1 cent for fraud prevention. Debit cards from small banks and credit unions are exempt and cost 0.80% + 15 cents in retail. Rewards credit cards cost the most.
Here is one $40 in-person sale. The "wholesale" column adds Visa's assessment, which Paya lists at 0.13% of debit volume and 0.14% of credit volume. The two merchant account columns use published pricing: Helcim at interchange + 0.40% + 8 cents with no monthly fee, and Stax at interchange + 8 cents, before its subscription.
| Card on a $40 sale | Square Free | Wholesale cost | Helcim | Stax (before subscription) |
|---|---|---|---|---|
| Regulated debit (big bank) | $1.19 | $0.29 | $0.53 | $0.37 |
| Exempt debit (small bank or credit union) | $1.19 | $0.52 | $0.76 | $0.60 |
| Traditional rewards credit | $1.19 | $0.82 | $1.06 | $0.90 |
| Visa Signature Preferred credit | $1.19 | $1.00 | $1.24 | $1.08 |
| Visa Infinite (spend qualified) | $1.19 | $1.08 | $1.32 | $1.16 |
Read down the Helcim column. On debit, Square costs about 66 cents more per sale. On a premium rewards card, Square is 5 to 13 cents cheaper. Stax costs less per sale but adds a $99 to $199+ monthly subscription.
One more wrinkle works in a small business's favour. Visa runs a Small Merchant fee program for merchants with up to $280,000 a year in Visa consumer credit sales, and its standard in-person credit rate is 1.29% to 1.88% + 10 cents instead of 1.51% to 2.30% + 10 cents. Ask any processor whether your volume qualifies. It lowers every credit row above.
Where most small businesses sit
The Federal Reserve publishes what debit actually costs. In its 2024 figures, 63.9% of Visa debit transactions were on covered (capped) cards, with an average interchange of $0.22, or 0.44% of an average $49.83 sale. Square Free charges $1.45 on that same $49.83 sale. That gap is what the owner's bank meant in the thread below when it pitched "debit card savings."
If you key in a lot of cards
Keyed-in sales are where Square costs the most. Manual entry and card on file are 3.5% + 15 cents on every Square plan. Card-not-present interchange is higher than in person, but not by that much. On a $100 keyed sale:
| Card on a $100 keyed sale | Square (any plan) | Helcim (0.50% + 25 cents) | Saving per sale |
|---|---|---|---|
| Regulated debit | $3.65 | $1.15 | $2.50 |
| Other consumer credit (Visa Product 1) | $3.65 | $2.88 | $0.77 |
| Traditional rewards credit | $3.65 | $3.03 | $0.62 |
| Visa Infinite (spend qualified) | $3.65 | $3.59 | $0.06 |
If you take phone payments from repeat customers, the cheaper fix may not be a new processor at all. Square invoices by ACH bank transfer cost 1% with a $1 minimum, capped at $10 on Plus and Premium. On a $1,500 order that is $10 on Plus or Premium, or $15 on Free, against $52.65 keyed. The same logic is in our look at what ACH should cost.
Not sure which rows of those tables your customers land on? Send us your Square transaction export. We sort your sales by card type and entry method and tell you, in writing, what the same month would have cost on interchange-plus.
What does switching save at $1 million a year?
At about $1 million a year in $40 in-person sales, switching from Square Free list rates to Helcim's lowest published tier saves roughly $2,400 to $11,200 a year, depending on the card mix. That range is the whole debate in one line.
The number comes from the owner who started the r/PaymentProcessing thread "Merchant Account: Denied by Bank." He runs two storefronts, processes "just under 1 million per year" on Square, and wrote that his bank said a merchant account "could save me as much as 7k per year in fees." A processor rep replied that he had "regularly saved businesses running about a mil a year north of $10k per year."
Both figures are plausible. Here is our maths, with two illustrative card mixes:
| Scenario ($40 average in-person sale) | Debit-heavy (60% regulated debit, 40% traditional rewards) | Rewards-heavy (20% regulated debit, 80% Signature Preferred) |
|---|---|---|
| $30,000 a month, Helcim | about $336 a month saved ($4,036 a year) | about $71 a month saved ($853 a year) |
| $30,000 a month, Stax after its $199 tier | about $257 a month saved | about $8 a month lost |
| $30,000 a month, Helcim, if you qualify for Visa Small Merchant rates | about $363 a month saved | about $124 a month saved |
| $1 million a year, Helcim | about $11,210 a year saved | about $2,370 a year saved |
These apply Visa rates and Visa's assessment to every card and ignore Mastercard, Amex and volume discounts: they show the spread, not your bill. That owner had also negotiated his Square rate down, so his real saving would be smaller.
His second store is "almost entirely keyed in over the phone," and he said the rate was "killing an already thin margin business." For that store, the keyed table above matters more than the in-person one.
Should you ask Square for a better rate first?
Yes, if you process more than $250,000 a year. Square's pricing page says businesses over that line can "talk to our team to see if you're eligible for custom pricing and processing fees." A counter-offer from Square costs you no hardware, no retraining and no new contract.
Go in with a written quote from a real processor, your last three months of volume by entry method, and your average sale. Our notes on negotiating processing rates were written for Toast, but the order of moves is the same: get the competing quote first, and ask for the markup in writing.
Is Square Plus or Premium worth it for the lower rate?
Only at higher volume per location. Using Square's published rates:
| Upgrade | Rate cut | Monthly cost per location | Break-even on fees alone |
|---|---|---|---|
| Free to Plus, in person | 0.1% | $49 | $49,000 a month in-person sales |
| Free to Plus, online and invoices | 0.4% | $49 | $12,250 a month online sales |
| Free to Premium, in person | 0.2% | $149 | $74,500 a month in-person sales |
Plus and Premium include other features that may be worth paying for, but on fees alone most single-location shops under $49,000 a month in person will pay more. The owner in the r/PaymentProcessing thread "Done with Square" was told his $20 plan was ending and he would be moved to the $49 plan automatically. Square's General Terms allow it: "We reserve the right to change any Subscription Fee upon reasonable advance notice."
What a merchant account costs that Square does not
A merchant account swaps one flat fee for a lower rate plus a list of other costs, and those are where a good-looking quote goes wrong. Before comparing rates, price these:
- Monthly or subscription fees. Stax runs $99 a month up to $150,000 a year, $139 from $150,000 to $250,000, and $199 or more above that. Helcim publishes no monthly fee.
- Contract, auto-renewal and early termination. Square charges no early termination fee. Helcim advertises "No contracts, leases, termination fees or cancellation fees." Many bank and ISO agreements are not like that.
- PCI, statement, annual and "infrastructure" lines. Square charges no PCI fee. The new lines owners are finding on statements are covered in what the fees on a merchant statement mean.
- Chargeback fees. Square charges none. Merchant accounts often charge per dispute, which matters if you handle chargebacks regularly.
- Hardware. Square readers run Square's processing. In the r/smallbusiness thread "Avoid Square at all costs," one commenter noted that Clover lets you use a different processor, "you're not LOCKED IN to both like how you are with Square."
- Markup changes. Interchange-plus is only as good as the "plus." Check whether the processor can raise it on notice.
A tip from a Merchant Maverick explainer is worth repeating: "be careful if a sales representative from a merchant account service provider offers you a discount on the standard published interchange rates." Interchange is set by the card networks. A rep who offers to discount it is discounting something else.
Approval, reserves and holds
Square lets almost anyone start taking cards and does its risk review afterwards. A merchant account reviews you first. That is the trade.
The owner in the "Denied by Bank" thread was turned down, with no reason given, citing poor credit after a divorce and a fraud conviction "over a decade ago." The replies were useful on two points. One commenter said the felony "isn't a problem if you aren't MATCH listed," and that his processing history should count for more than his credit. Another advised against sending out lots of applications at once. Both are commenters' views, not rules, but they match how underwriting works: a clean history with one chargeback in seven years is a strong file.
The thread shows one more hazard: of the 12 replies we fetched, 8 were reps offering help by DM. Get any quote as a written fee schedule, not a chat.
Square can hold money too. A Square seller wrote on the Square Community forum that with "$100k sales per month" and "annual refund of $1700," Square told them it would hold "$120k-$150k," a 30% reserve for 120 days. A merchant account does not make holds impossible; it moves the review to the start. If you are already dealing with one, see what to do when a processor holds funds.
Check your own numbers: the 3-question test
Open your Square Dashboard and pull the last three months. Then answer these:
- How many of your payments are debit? Square's transaction export shows card brand and entry method. If debit is half your transactions or more, the gap is large.
- What share is keyed or card on file? Anything above about a fifth of volume at 3.5% + 15 cents is worth fixing, whether by switching or by moving repeat customers to ACH invoices.
- What is your monthly volume and average sale? Below roughly $10,000 a month, a monthly fee or subscription can eat the saving. Small average sales make the per-transaction fee matter more.
Then, with a quote in hand:
- The markup is written as interchange + X% + Y cents, not a "qualified" rate.
- Every monthly, annual, PCI, statement and chargeback fee is listed.
- The term, auto-renewal and termination terms are in writing.
- You know what the new hardware costs.
- You have asked Square for its custom rate (over $250,000 a year).
- You have priced your last full month on both options, line by line.
For the line-by-line step, the effective rate method is the one to use on the new statement after you switch, too.
Got a quote and a Square export? We price your last month on both, flag the fees in the quote that Square does not charge, and tell you in writing whether switching saves money after hardware and contract terms.
Square vs merchant account, head to head
Square
Best for: new businesses, seasonal or low-volume sellers, and shops where most customers pay with premium rewards cards. Pricing: 2.6% + 15 cents in person, 3.3% + 30 cents online, 3.5% + 15 cents keyed on Square Free; Plus $49 and Premium $149 a month per location (Square). Square is a payment facilitator: you process under Square's account, with instant sign-up and one rate for every card. The point of sale, hardware and processing come as one package. Pros: no underwriting to start, no PCI, chargeback or termination fees, predictable pricing. Cons: overcharges debit and keyed sales, subscription fees can change on notice, holds come after the fact. Our verdict: the right default until your card mix makes the flat rate expensive.
Merchant account (interchange-plus)
Best for: businesses doing $10,000 to $30,000 a month or more, debit-heavy customers, or a lot of keyed sales. Pricing: interchange plus a markup; for example Helcim at 0.40% + 8 cents in person, or Stax at 8 cents plus a $99 to $199+ subscription (Helcim, Stax). You get your own merchant account after underwriting, and your cost follows each card's wholesale rate. Pros: much cheaper on debit and keyed sales, costs are visible line by line, more choice of hardware and software. Cons: approval can fail, contracts vary a lot, and the extra fees can wipe out the saving. Our verdict: worth it when the 3-question test says so and the quote survives the checklist.
| Square | Merchant account | |
|---|---|---|
| Getting started | Minutes, no underwriting upfront | Application, credit check, statements |
| Debit card sale | Same rate as credit | Near wholesale (about 0.05% + 22 cents) |
| Premium rewards card | Same flat rate | Can cost more than Square |
| Keyed sales | 3.5% + 15 cents | Card-not-present interchange + markup |
| Monthly fees | $0, $49 or $149 per location | $0 to $199+ depending on provider |
| Contract | None | Varies: check term and termination |
| Holds | After the fact | Underwritten upfront, still possible |
Choose Square if you process under about $10,000 a month, most customers use rewards cards, you value the all-in-one POS, or you cannot pass underwriting today.
Choose a merchant account if debit or keyed payments are a big share of your sales, you are above $250,000 a year and Square will not come close on custom pricing, and the written quote holds up once every fee is counted.
Deeper answers
Does the $10,000 a month rule hold up?
Roughly, for debit-heavy shops. A processor in r/smallbusiness put it as "if you process more than $10,000 a month, Square is expensive compared to a full fledged merchant account." At $10,000 a month on a no-monthly-fee plan, a debit-heavy mix saves around $110 a month in our scenario. A rewards-heavy mix saves around $24. The rule is a starting point; your card mix is the answer.
What if my debit cards are from credit unions?
Then the saving is smaller. Exempt debit costs 0.80% + 15 cents in retail on Visa's table, about $0.52 wholesale on a $40 sale against $0.29 for regulated debit. Square still costs more on those cards, but by about 43 cents a sale on Helcim's rates, not 66.
Can you do this yourself?
Yes, most of it. Pulling your Square export, counting debit and keyed share, and asking Square for custom pricing is an afternoon's work. Comparing a quote is harder, because the fees that decide it are spread across a fee schedule, an application and a terms page. That is usually where owners stop being sure. It fits the wider pattern in where small businesses lose money: no one line is big, and the total is.
If you are a contractor weighing larger tickets, payment processing for contractors covers ACH caps and big-invoice maths. To compare Square with other providers, our processing fees table lists 15 of them, and more on payouts is in the getting paid hub.
How to decide
Start with your card mix and keyed share, not the volume rule. If your customers mostly pay by debit or you key in a lot of cards, a merchant account at an honest interchange-plus markup will likely save real money. If they mostly use premium rewards cards, ask Square for a custom rate and stay unless the written quote clearly wins once every fee is counted.