Square and Helcim are the two names that come up first when a Canadian small business outgrows pen-and-paper pricing — and they could not be more different under the hood. Square charges one flat rate for everything, no monthly fee, no contract, start-today simplicity. Helcim, the Canadian processor, charges interchange-plus — the card networks' wholesale cost plus a fixed markup — with automatic discounts as your volume grows. The question is never which one is "better." It is where your volume and your debit mix sit.
Two pricing models, one decision
Square's model is aggregation: your sales go through Square's master merchant account, and you pay a single percentage on every transaction. Helcim gives you a dedicated merchant account in your own business's name and passes the wholesale interchange cost straight through. That structural difference drives every dollar below.
| Square | Helcim | |
|---|---|---|
| In-person credit | 2.5% | Interchange + 0.40% + $0.08 |
| In-person Interac debit | 0.75% + 7¢ | Interchange + markup (per-tap cents) |
| Online | 2.8% + 30¢ | Interchange + 0.50% + $0.25 |
| Manually entered | 3.3% + 15¢ | Card-not-present interchange + markup |
| Monthly fee / contract | $0 / none | $0 / none |
| Card reader | $69 (contactless + chip) | $129 (card reader) |
| Account model | Aggregator (Square's account) | Dedicated merchant account |
The debit-tax gap most comparisons skip
Here is the line that decides it for a huge share of Canadian merchants. Interac debit costs pennies wholesale — a few cents per tap. Helcim passes that through plus its markup. Square Canada prices in-person debit at 0.75% + 7¢. On a $45 sale, Square's debit line is about $0.41; Helcim's is roughly $0.08 in markup plus pennies of wholesale. Every debit tap on Square hands the provider a margin that interchange-plus does not.
A debit-heavy store — coffee shops, quick-service, convenience — can pay more on debit than on credit under flat-rate pricing without ever noticing, because the statement shows one blended line. Pull your last statement and divide total fees by card volume separately for debit and credit. The debit number is usually the surprise.
Worked math: where the $10,000/month crossover comes from
The setup: $10,000/month in card sales, $45 average ticket (~222 transactions). Mix: 60% credit, 40% debit.
Square: credit $6,000 × 2.5% = $150. Debit: $4,000 × 0.75% = $30, plus 89 × $0.07 = $6.23 → ~$36. Total: ~$186/month.
Helcim: credit wholesale on the mix averages near 1.35% ($81) + 0.40% markup ($24) + 133 × $0.08 ($10.64) → ~$116. Debit: 89 taps at markup $0.08 plus pennies of wholesale → ~$12. Total: ~$128/month.
The gap: roughly $58/month — about $700 a year. At $25,000/month the same math opens to roughly $145/month, or ~$1,740 a year. Below $10,000 the annual gap is a few hundred dollars — real money, but the kind Square's zero-friction start can justify. Above it, the interchange-plus advantage compounds with every tier of Helcim's automatic volume discounts.
Aggregator vs dedicated merchant account
The pricing math is only half the decision. Square processes through its own master account — you are a sub-merchant. That is why onboarding takes minutes, and it is also why accounts can be frozen by an algorithm: a Winnipeg tree-service owner described his account closed after his first client payment, with funds held 90 days despite providing every document Square asked for. Review patterns across Trustpilot, G2 and Capterra repeat the theme: hard-to-reach support and slow resolutions when something goes wrong.
Helcim issues a dedicated merchant account in your business's name. Underwriting takes longer, but your funds are not pooled with thousands of other merchants and a risk algorithm cannot sweep them. Helcim's verified merchants on SoftwareAdvice rate value-for-money 5/5, and SelectHub's aggregation puts user satisfaction at 88% across 54 reviews. TechRepublic's 2026 review scored Helcim 4.58/5, citing pricing transparency and account stability as its top marks.
Who fits whom
- Choose Square if you are starting out, processing under ~$10,000/month, value same-day setup, and your debit mix is light. Predictability beats optimization at low volume.
- Choose Helcim if you process over ~$10,000/month, run debit-heavy, or want a dedicated merchant account with statements you can audit line by line.
- Check the debit line first. Whatever you choose, separate debit from credit on your current statement before you sign — it is the number most likely to change your answer.
- Re-run the math at $25K. Businesses that start on Square often stay past the point where interchange-plus would save them four figures a year. Put a calendar reminder at your current run-rate doubled.
A note from the audit desk: neither provider in this comparison uses long-term contracts, which is genuinely rare in this industry — but contract length and termination fees are still the silent killers everywhere else. Wherever a contract exists, double-check the exit terms before you sign.
A note on steps: this is a buying-decision guide, not a repair procedure — the numbered framework above is the actionable part, and there is no settings path to click through.
FAQ
Is Helcim actually cheaper than Square?
Above roughly $10,000/month in card volume — yes, consistently, and the gap widens with volume because of Helcim's automatic tier discounts. Below that, the annual difference is a few hundred dollars and Square's instant setup has real value.
Why does my debit mix matter so much?
Interac debit costs pennies wholesale. Flat-rate pricing bills it at a percentage — Square Canada charges 0.75% + 7¢ in person — while interchange-plus passes through the per-tap cents. Debit-heavy stores overpay the most on flat-rate.
Can Square freeze my funds?
Square's aggregator model means your sales flow through Square's account, and its risk systems can and do freeze or close accounts — merchant reviews document 90-day holds. A dedicated merchant account (Helcim, Moneris, and most traditional acquirers) does not pool your funds this way.