Payments for Dental Practices: What Stripe, Square, and the Big Processors Actually Cost You

Your tickets are weird: $200 for a cleaning, $350 for a filling, $1,400 for a crown, $4,500 for an implant, $6,000 for Invisalign. Stripe, Square, Adyen, Chase, Fiserv, Global Payments, and Worldpay priced for coffee shops. What their published rates cost you at real dental ticket sizes — and the workflows their generic pages ignore: card-on-file balances, no-show fees, HSA/FSA cards, and payment plans. Rates checked October 2026. Also see Dental Practices, AI for Dental Practices, and Tech for Dental Practices.

The fee table: what each processor actually charges you

Square (Free plan): 2.6%+$0.15 in-person, 3.3%+$0.30 online, 3.5%+$0.15 stored/keyed. Stripe: 2.7%+$0.05 in-person, 2.9%+$0.30 online, 3.4%+$0.30 card-on-file. Clover (Fiserv): 2.3–2.6%+$0.10 in-person, 3.5%+$0.10 keyed/online. Interchange-plus = 0.3% markup estimates.

$200 cleaning (in-person): Square $5.35 · Stripe $5.45 · Interchange-plus ~$4.10

$350 filling (in-person): Square $9.25 · Stripe $9.50 · Interchange-plus ~$7.10

$1,400 crown (in-person): Square $36.55 · Stripe $37.85 · Interchange-plus ~$28.10

$4,500 implant balance (card on file): Square $157.65 · Stripe $153.30 · Interchange-plus ~$90.10 · ACH (0.8%, capped at $5) $5.00

$6,000 Invisalign (ACH vs card): Square stored $210.15 · Stripe stored $204.30 · ACH $5.00

$210 versus $5 — same $6,000 case. At volume: $80,000/month in card revenue = $960,000/year. Square: ~$25,920/year. Interchange-plus: ~$20,160/year. Difference: ~$5,760/year — a hygienist's monthly salary. Every processor rides on payments infrastructure — companies like Finix build the rails moving card money from your patient's bank to yours.

The row your statement hides: the keyed-in penalty. Card reader dies at checkout and you type the number: Square jumps to 3.5%+$0.15 — the $1,400 crown costs $49.15 instead of $36.55. Keep a backup reader the way you keep backup suction tips.

The workflow checklist the big processors fail

Where dental practices actually lose money:

• Card on file at treatment presentation. The $700 patient portion of the crown gets authorized today, captured when insurance pays. Stripe charges 3.4%+$0.30 and Square 3.5%+$0.15 on stored cards — ~$24 on a $700 balance vs ~$14 on interchange-plus. Neither processor's generic pages mention stored-card rates at all.
• No-show and late-cancel fees. A $50–$75 fee policy only works with a card on file and signed consent. The fee nobody collects is a policy, not a sentence.
• HSA/FSA cards. Dental is HSA/FSA-eligible, and these cards run through your normal terminal — no special setup. January through March is HSA season: patients with fresh balances say yes to treatment plans faster. Market to it.
• Payment plans vs. CareCredit. In-house plans age like milk unless they're auto-billed to a stored card. CareCredit's merchant discount starts around 5.9% for 6-month promotional terms — $82.60 on the $1,400 crown — but it's non-recourse and pays you in two business days. The math: CareCredit costs more than interchange-plus and infinitely less than an uncollected balance.
• Deposits on big cases. 50% down on implants and Invisalign before you order the lab work. A generic payment link doesn't tie the deposit to the treatment plan — your PMS-integrated payments do.
• ACH on big balances. $5 flat on a $4,500 implant balance vs $157.65 stored-card on Square. Offer it at treatment presentation: “card today, or bank transfer and save the fee.” Settles in 3–5 days.
• Refunds cost you twice. Stripe and Square don't return the original processing fee when you refund. That $1,400 crown refund costs you the $36.55 fee on top of returning the money — authorize-and-capture exists precisely to avoid this.
• Dual pricing. Show a cash/check price and a card price. Legal in all 50 states (unlike surcharging, banned in Connecticut and Massachusetts) — the card brands allow it as long as both prices are displayed. The 3% card price funds itself on crowns and implants.

Flat-rate vs. interchange-plus: the break-even at dental tickets

Here's the uncomfortable truth about flat-rate simplicity: with a 0.3% interchange-plus markup, interchange-plus beats Square's 2.6%+$0.15 in-person rate at every dental ticket size. On the $200 cleaning it's $4.10 vs $5.35. On the $1,400 crown it's $28.10 vs $36.55. The gap widens as tickets grow — exactly the direction dentistry is going.

The real break-even question is flat-rate vs. flat-rate on stored cards, because that's where your big balances live. A practice with $30,000/month in stored-card balances pays Square ~$1,050/month in stored-card fees; interchange-plus runs ~$600. That's $5,400/year for the privilege of a simpler statement.

When flat-rate is fine: a startup practice under $15,000/month in card volume, where the $5,000/year gap doesn't cover the hassle of a merchant-account application. When it's not: any practice doing implants, Invisalign, or full-mouth rehab — your average ticket is the thing flat-rate punishes most. Adyen, Chase, Fiserv, Global Payments, and Worldpay are quote-based here: fine if you negotiate the interchange-plus markup in writing, miserable if you sign a tiered plan unread. Ask for the four junk-fee line items by name: statement fee, PCI fee, batch fee, monthly minimum.

The honest verdict on each processor

• Square: fine for a startup practice under $15k/month. Outgrow it when implants and Invisalign enter the picture — the 3.5% stored-card rate is where your margins go to die. No chargeback fees is a genuine plus.
• Stripe: great if your patient payments live online (payment links, online bill-pay). For a dental office it's a developer tool in a payments costume — no dental workflow out of the box.
• Clover/Fiserv: decent countertop hardware, but the 3.5%+$0.10 keyed/online rate punishes exactly the stored-card balances dentistry runs on. Negotiate, or skip.
• Adyen: enterprise; no returned calls under ~$1M/year. Not a dental product.
• Chase, Global Payments, Worldpay: quote-based, bank-led, zero dental guidance. Fine if you negotiate hard and get interchange-plus in writing; miserable if you sign unread.
• PMS-integrated payments (Dentrix Pay, Open Dental's X-Charge, Weave Payments): convenient, Square-priced. Fine for year one — the integration (payments posting straight to the ledger) is worth real money in saved front-desk hours.
• Interchange-plus via an independent ISO: the grown-up answer past $20k/month in card volume.

ClaroPro pairs bilingual voice-to-invoice with payments — the invoice and text-to-pay link leave the operatory before the patient reaches the parking lot.

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

Finix's public docs at docs.finix.com are the blueprint for the workflows above:

Card on file — tokenization. The patient authorizes the post-insurance balance at treatment presentation; you never store the card number. Finix's Tokenization Forms embed a PCI-compliant form in your page or app — the card number lives only inside Finix's iframe, your server gets a token starting with “TK” and creates a Payment Instrument on the patient's Identity via POST /payment_instruments. When the EOB lands, you charge the stored instrument. Account Updater refreshes the card when the bank reissues it — your $700 balances don't die to expired cards.

Deposits without a developer. Payment Links you text the patient — no integration — and Invoices with partial payments. Your 50% deposit on the $4,500 implant: half now, balance later.

Authorize now, capture when insurance pays. POST /authorizations holds funds on the patient's estimated portion — reserved, not taken. EOB arrives: POST /authorizations/{id}/captures. Treatment cancels: POST /authorizations/{id}/void. No charge-and-refund — refunds cost you the original fee on most processors.

Webhooks close the loop. Finix fires an event when the payment settles, so your ledger marks the account paid without anyone checking a bank feed — reconciliation that runs itself.

The catch: Finix is infrastructure: dashboard tools work with no code; API flows need a developer. Test at finix.sandbox-payments-api.com first. And you don't open a Finix account the way you open Square — Finix powers software platforms, so its rails reach you through a provider built on top, the same way your handpieces run on air you didn't compress.

FAQ

Cheapest way to take a $6,000 Invisalign payment? ACH bank transfer — about $5 flat. You wait 3–5 days. Worth $200 of waiting.

Can I surcharge dental patients for credit cards? In most states yes, but it's banned in Connecticut and Massachusetts and the card brands cap it. Dual pricing (a check price and a card price, both displayed) gets you the same math with none of the compliance headache.

Should I offer CareCredit or run in-house plans? CareCredit for anything over ~$1,000 you don't want to chase: ~5.9% merchant discount on 6-month terms, non-recourse, paid in two days. In-house plans only with auto-billing to a stored card — manual plans age like milk.

Do HSA/FSA cards work on my normal terminal? Yes — dental is an eligible expense and the cards run like any other card. No special setup; just make sure your merchant category code is right.

Will switching processors interrupt the practice? Not with a one-week overlap: old account live, new charges on the new one, never cancel before the first deposit lands. Recurring stored-card charges need re-tokenization — plan that migration, don't wing it.

What about the no-show fee — is it legal? Generally yes with signed consent and a card on file, but check your state dental board rules and never bill insurance for it. The fee you can't collect is a suggestion, not a policy.

The processor decision is worth roughly $6,000 a year; the workflow decision (card on file at treatment presentation, no-show policy with teeth, ACH on big balances) is worth more. Collect the patient portion before they reach the parking lot — AI for Dental Practices shows the voice-to-paid checkout. Once a year, run this fee table against your last 12 months of statements — processors count on you never doing the arithmetic. Re-check these numbers yearly.