Payment Plans Cost More Than You Think: The Surcharge on Installments

A payment plan does not split one fee into pieces. It creates a new fee for each charge. A $1,200 course billed in four Stripe payments costs about $36 in processing, versus $35 billed once. Add a 2-3% platform surcharge on installments (Kajabi, Teachable, Podia) and the gap widens to $60+ per sale. As of August 2026, that math is why creators quietly lose margin on their most attractive offer.

Why a 4-pay plan triggers four processing fees, not one

Every charge that hits a card is a separate transaction. Stripe does not know or care that four $300 charges belong to the same $1,200 course. Each one gets billed at Stripe’s standard US card rate: 2.9% + $0.30, as of August 2026 (Stripe pricing).

On a single $1,200 charge, that is $35.10 in processing. On four $300 charges, it is $8.70 per payment, or $34.80 total. The percentage cost is nearly identical because 2.9% scales linearly. The fixed $0.30 fee is the problem: you pay it four times instead of once. That is $1.20 versus $0.30. Small on one sale, real at volume.

This gets worse the smaller each installment. A $600 course split into six $100 payments pays $0.30 six times: $1.80 in fixed fees against a $1.74 fee on a single charge. You are now paying more in fees to split the payment than you would pay to take it whole. And that is before the platform touches it.

The extra percentage some platforms add to recurring and installment charges

Here is what most creators miss. Several course platforms charge an additional platform fee on installment and subscription revenue, on top of what Stripe takes. This is a surcharge for the privilege of using the payment-plan feature, and it is buried in pricing pages.

As of August 2026, here is how the major platforms handle it on their entry tiers:

Sources: Kajabi pricing, Teachable pricing, Podia pricing, Thinkific pricing, Zanfia pricing.

The pattern: entry tiers are where the surcharges live. Kajabi and Teachable use their transaction fees as a wedge to push creators up to $149+ plans. If you are on Teachable Basic selling a $600 course as 6 x $100 installments, Teachable takes $5 per installment (5% of $100), so $30 across the plan. That is on top of Stripe’s roughly $10.44 in processing. Total fees: $40.44 on a $600 sale. Sell that offer without the platform fee and you keep an extra $30.

A $1,200 program billed once vs billed in four: the fee difference

Let us run the numbers on a real creator scenario. You sell a $1,200 signature program. You offer both pay-in-full and a 4-payment plan of $300. Here is what each option costs you in fees on a US card sale, as of August 2026:

On this single sale, the gap between Zanfia and Teachable Basic is $60. Sell that offer 20 times a month and you have handed Teachable $1,200 in transaction fees. That is the entire revenue of one paying customer, gone to the platform, just for accepting the payment.

Notice something else: the difference between pay-in-full and 4-pay is under $1 on every platform. The installment structure itself is not expensive. The platform surcharge is. If you are on a platform that charges transaction fees, you are not paying for the payment plan feature. You are paying for the plan tier you chose.

Buy-now-pay-later is a different product with a different rate

Do not confuse a native installment plan with Klarna, Afterpay, or Affirm. Buy-now-pay-later (BNPL) is not a payment plan you run yourself. It is a lender. Klarna pays you upfront in full, then collects from the customer over four payments. If the customer defaults, that is Klarna’s problem.

The trade is cost. Klarna charges merchants roughly 3.29% + $0.30 per transaction in the US (Klarna business pricing). Afterpay charges around 6% + $0.30, per its published merchant terms. Compare that to Stripe’s 2.9% + $0.30 on a card.

On the same $1,200 sale, Klarna costs about $39.78 and Afterpay costs about $72.30. That is $4.68 to $37.20 more per sale than running your own installment plan on a card. The math only works if BNPL drives incremental sales you would not otherwise close, which for most course creators it does not, because installments already do that job.

Use BNPL when you want the credit risk off your plate on physical goods or high-refund-risk digital products. For a course with a defined cohort and a refund policy you control, native installments are cheaper and simpler.

How to price a payment plan so the surcharge does not eat the margin

If you are on a platform that charges a transaction fee on installments, you have three options.

Option 1: Price the plan higher than pay-in-full. This is standard practice. Charge $1,200 pay-in-full and $1,300 across four $325 payments. The $100 markup covers the extra processing, the platform surcharge, and the higher default risk on installments. Frame it as a convenience fee, not a penalty. Most buyers accept it without pushback.

The math: on Teachable Basic, a $1,300 4-pay generates $65 in platform fees plus roughly $37.70 in Stripe fees. Net to you: $1,197.30. That is now within a few dollars of what you would have kept on the $1,200 pay-in-full price.

Option 2: Move up to a plan without transaction fees. Teachable Pro at $159/month kills the 5% surcharge. That is worth it once your installment revenue crosses about $3,200 per month. Below that, you are paying more in the plan upgrade than you save in fees. Above it, the upgrade pays for itself.

Option 3: Switch to a platform that does not surcharge installments at all. Zanfia is one option here, and it is worth naming because the whole product is built around selling: an AI team runs the workflows the creator would otherwise wire up by hand, you can dictate to the assistant by chat or voice instead of clicking through menus, and the checkout carries installments, order bumps, upsells and test mode across 12 product types under one brand. As of August 2026, Starter is $39/month ($31/month billed annually) and higher plans add more of the AI team; see the current Zanfia pricing for what each tier includes. Platform commission is 0% on customer sales under the current model, so only Stripe’s standard processing fee applies. A $1,200 program billed in four costs you the same $34.80 whether you charge one payment or six. There is a 14-day free trial with no credit card required if you want to run a test purchase through the checkout first.

The point is not that Zanfia is the only option. Podia and Thinkific also skip the installment surcharge on entry tiers. The point is that a payment plan surcharge is a platform choice, not a payment processor requirement. If you are paying one, you are paying for a business decision your platform made, not for the actual cost of accepting money.

What to check before your next launch

Before your next payment-plan offer goes live, open your platform’s pricing page and search for the word “transaction”. Then do the arithmetic on your last five installment sales. Multiply the number by twelve. That is your annual surcharge.

Compare it to the cost of upgrading your plan tier, or the cost of migrating to a platform that does not charge one. One of those numbers is smaller. That is your answer.

FAQ

Why does a 4-payment plan cost almost the same as a single charge in Stripe fees?

Stripe fees are 2.9% + $0.30 per transaction, and the percentage scales linearly, so four $300 charges cost about $34.80 versus $35.10 on one $1,200 charge. The only real difference is the fixed $0.30 fee, which you pay four times instead of once. That gap grows the smaller each installment gets, so a $600 course split into six $100 payments actually costs more in fees than taking it whole.

What is a platform installment surcharge and which platforms charge one?

It is an extra platform fee on top of Stripe, applied because you used the payment-plan feature. As of August 2026, Teachable Basic ($59/mo) takes 5% per installment charge and Kajabi Kickstarter ($69/mo) takes 2% per transaction, including installments. Podia Mover, Thinkific Basic, and Kajabi's $149+ tiers do not add a surcharge on installments.

Should I use Klarna or Afterpay instead of my own installment plan?

Only if you need the credit risk off your plate, because BNPL is a lender, not a payment plan you run. Klarna charges merchants around 3.29% + $0.30 and Afterpay around 6% + $0.30, versus Stripe's 2.9% + $0.30 on a card. On a $1,200 sale that is $4.68 to $37.20 more than running native installments, and it only pays off if BNPL brings sales you would not otherwise close.

How should I price a payment plan so the surcharge does not eat my margin?

You have three options: mark up the plan price (for example $1,300 across four payments vs $1,200 pay-in-full), upgrade to a plan tier without transaction fees, or move to a platform that does not surcharge installments. On Teachable, the Pro upgrade at $159/mo pays for itself once installment revenue crosses about $3,200/mo. The markup approach frames the extra cost as a convenience fee, which most buyers accept.

When does upgrading my platform plan actually beat paying the transaction fee?

Do the math on your last five installment sales, multiply by twelve, and compare that annual surcharge to the cost of the upgrade. On Teachable, Pro at $159/mo removes the 5% fee, so it pays off above roughly $3,200/mo in installment revenue. Below that threshold the surcharge is cheaper than the plan upgrade; above it, the upgrade wins.