See whether Shop Pay Installments still pay after the extra fee.
Paste the Shopify Payments card rate and the Shop Pay Installments
rate from a payout. The table keeps the same ticket, then blends a
month at the share of checkouts that actually use installments, and
shows the extra orders you need for that mix to match turning
installments off.
Order, rates and mix
Card vs Shop Pay Installments
$—
extra fee on an installment checkout
Card profit
Installment profit
Extra installment fee
Monthly extra at this share
Break-even conversion lift
Same order, two payment paths
Path
Rate
Fees
Profit
Vs card
Both rows use the Shopify Payments path — Shop Pay Installments is not a PayPal checkout. The monthly extra applies the installment share to volume. Transparent arithmetic from your inputs — not Affirm’s or Shopify’s current rates.
What this checks
Merchants search “Shop Pay Installments merchant fee” because the
installment rate looks expensive next to a 2.9% card. The missing
piece is mix. Most checkouts still pay with a card or Shop Pay; only
a share uses installments. A 3-point gap on 15% of orders is a
smaller monthly hole than the sticker rate, and a small conversion
lift can cover it.
How much extra does Shop Pay Installments cost the merchant?
Shop Pay Installments is usually a higher Shopify Payments rate than a regular card or Shop Pay card checkout. Enter the installment rate from a payout or the Shop Pay Installments line in admin — this page does not publish Affirm's or Shopify's live schedule. The extra fee is that rate gap on the order total, including shipping charged.
When do Shop Pay Installments still pay?
They pay when extra conversion covers the extra fee on the share of checkouts that use installments. This calculator shows the extra fee on one ticket, the blended month at your installment share, and the lift (extra orders) needed to match turning installments off at the same volume. Type extra monthly orders if you already see a lift.