Payments for Martial Arts Studios: What Stripe, Square, and the Big Processors Actually Cost You

The short version: martial arts schools run on monthly tuition — which means recurring billing at stored-card rates, and a fee table where ACH beats every card by 4-5x. On 120 students at $150/mo, the wrong billing setup costs you over $8,000 a year versus ACH. The big processors' generic pages never mention tuition, belt-testing fees, or EFT. Here is what they actually cost a martial arts school. Also see Martial Arts Studios, AI for Martial Arts Studios, and Tech for Martial Arts Studios.

The fee table: tuition is the P&L

Rates checked October 2026. Square: 2.6% + 15¢ in-person, 2.9% + 30¢ online, 3.5% + 15¢ keyed/stored. Stripe: 2.7% + 5¢ in-person, 2.9% + 30¢ online, 3.4% + 30¢ stored; ACH 0.8% capped at $5. Interchange-plus: ~0.3% markup, effective ~2.0% card-present.

$150/mo tuition × 120 students = $18,000/mo:

Stored card (Square 3.5% + 15¢): $648/mo · $7,776/yr

Stored card (Stripe 3.4% + 30¢): $648/mo · $7,776/yr

Stored card (interchange-plus ~2.0% + 10¢): ~$372/mo · ~$4,464/yr

ACH tuition (0.8%, capped): ~$144/mo · ~$1,728/yr

Square versus ACH on the same $18,000 in tuition: a $6,048/yr gap. Per student per year: $64.80 in fees on Square stored-card versus $14.40 on ACH. The tuition row is the entire P&L — everything else is rounding.

$75 belt-testing fee (in-person): Square $2.10 · Stripe $2.08 · Interchange-plus ~$1.50 · ACH $0.60

$300/week summer camp (online invoice): Square $9.00 · Stripe $9.00 · Interchange-plus ~$6.10 · ACH $2.40

The break-even: fix tuition first, argue about cards later

For tuition, ACH wins at every volume — the only question is migration speed. The break-even that matters is the card volume that remains (uniforms, testing fees, retail, camp balances paid by card).

IC+ plans carry ~$10-25/mo in fixed costs. At $3,000/mo in card transactions (testing fees + uniforms + retail): Square in-person costs ~$82.50. Interchange-plus at ~2.0% costs ~$60 + ~$20 = ~$80. Roughly even. At $6,000/mo: Square ~$165; IC+ ~$120 + $20 = ~$140. The flip is around $4,000-6,000/mo in card volume — lower than most businesses, because the tuition already left via ACH and the remaining volume is small.

The honest note: for many schools, the remaining card volume never clears the flip — and that is fine. Flat-rate in-person at 2.6% + 15¢ on $3,000/mo costs $82.50/mo; the IC+ savings would be single digits. Do not chase the card-rate optimization until tuition is on ACH. The $6,048/yr tuition gap is 50x the card-rate debate.

The workflow checklist the big processors fail

Run every processor against this checklist before you sign:

• Recurring tuition billing. Drafted on the 1st, prorated for mid-month enrollments, retry schedules you control. Square's recurring billing runs at stored-card rates (3.5% + 15¢) — the most expensive tuition billing in this guide.
• ACH for tuition. Non-negotiable. 0.8% capped beats every card rate 4-5x. Default every enrollment to bank draft.
• Dunning automation. Day-zero failed-tuition text with a card-update link. Parents are not deadbeats; their cards expire. The text fixes it before it becomes a conversation.
• Belt-testing fees as SKUs. The $75 testing fee must bill automatically off the testing roster — not a sticky note, not a separate invoice someone remembers to send. If the system cannot do this, it is not school software.
• Multi-student family billing. Sibling discounts, one statement per family, one draft. "Two kids, two logins, two drafts" is how families churn.
• Camp and after-school billing. Separate SKUs with separate terms ($300/week camp, monthly after-school) — and pickup authorizations tracked with human verification, never automated.

The honest verdict on each processor

Square — wrong-shaped for tuition. Fine for uniforms and retail at the counter. But tuition at 3.5% + 15¢ stored is the most expensive tuition billing here — $7,776/yr on 120 students versus $1,728 on ACH. Steelmanning Square: zero monthly cost, simplest countertop for a new school's first 90 days.

Stripe — good pipes, no school. Excellent ACH (0.8% capped) and card APIs — but no tuition dunning, no belt-test SKUs, no family billing out of the box. You build the school on the pipes. Custom software material only.

Interchange-plus via a school-savvy provider — the quiet winner for card volume. ~2.0% effective on testing fees, uniforms, and retail, ACH for tuition, real dunning. The catch: you assemble it.

Platform-bundled billing (Kicksite, Zen Planner, etc.) — convenient, inspect the rate. One throat to choke, but check the effective rate on stored tuition — if it is 2.9%+, price it against DIY ACH instead of assuming it is competitive.

Adyen, Chase Payment Solutions, Fiserv, Global Payments, Worldpay — absent. Quote-based enterprise sales, zero school-specific content: nothing on tuition, testing fees, or EFT. Not competing for your business.

How a school actually wires this up: notes from Finix's public docs

ClaroPro pairs bilingual voice-to-enrollment with payments — the same-day enrollment (speak the program, the uniform, the testing schedule; text the agreement; paid before the parking lot) runs on one system.

For the billing plumbing, Finix's public docs map directly onto school needs. Recurring billing primitives for monthly tuition with proration for mid-month enrollments and retry schedules you control; ACH transfers as the default tuition rail at 0.8% capped; tokenized payment instruments for card-on-file uniforms and testing fees; webhooks on failed payments that trigger the day-zero dunning text to the parent; family-level billing constructs (one statement, sibling discounts, one draft); and separate merchant accounts per location so location two's launch does not re-trigger risk review on location one. Standard infrastructure documented at docs.finix.com. Knowing these are commodities is how you judge whether a school platform's billing is real infrastructure or a markup wrapper.

FAQ

Should tuition go on ACH? As many families as possible. A small bank-draft discount moves parents fast — the few dollars you give up save far more in fees.

What about parents who insist on cards? Take the card — an enrolled student at 3.4% beats an empty mat at 0%. Default to ACH first.

Can I surcharge credit cards on tuition? State-dependent and stricter for recurring billing. The ACH discount is cleaner in every state.

How do I handle the parent who disputes three months of tuition? The signed enrollment agreement, the attendance record showing the kid kept coming, and the confirmation texts are your three documents. Processors side with the school that has all three.

Do camp payments need their own setup? Bill them as SKUs with ACH as the default rail — large one-off card charges are exactly what triggers risk holds on flat-rate aggregators.

The order: 1) tuition on ACH with day-zero dunning, this month. 2) Belt-testing and camp fees as automatic SKUs. 3) Interchange-plus for the card volume that remains. 4) Never let tuition chase stay a manual job — it is the most expensive hourly work in the building. Then read Tech for Martial Arts Studios — the platform is where tuition either collects itself or does not.