Force posts (no matching auth) and chip fallback (magstripe on chip-capable cards) are showing up as real dollars this cycle.
(Part 3 of 5 in the Mastercard Spring 2026 Package series)
Force Post Transaction Fee. $0.09 per transaction on clearing transactions submitted without an approved authorization (per Fiserv Spring 2026 Card Brand Updates). Mastercard assesses the fee on first presentment clearings that can't be matched to a preceding auth.
Where this hits. Flows where authorization and clearing are decoupled. Hospitality with delayed clear. MOTO with batched submissions. Some B2B and marketplace flows. Force posts happen when an auth was missed, expired, or processed off-network and the clearing came through anyway. For most acquirer books, this is recoverable through either ops hygiene or pricing/pass-through adjustments.
Mastercard/Maestro Fallback Avoidance Fee. 0.10% on fallback transactions where a chip-capable card is used at a chip-enabled terminal but the transaction is completed using the magnetic stripe instead of the chip (per Fiserv Spring 2026 Card Brand Updates). The "card had a chip, terminal had a chip, transaction ran on the magstripe anyway" scenario.
Where this hits. Portfolios with aging POS hardware. Fuel stations, small retail, restaurants that haven't refreshed terminals in years. Ten basis points on a busy fallback-prone merchant compounds quickly.
Both fees are billed to the acquirer. Both are recoverable through merchant-side action.
This week, for acquirers and ISOs.
- Pull force post transaction counts by merchant from the April and May cycles. Identify the top 20 contributors. Look at whether the issue is auth-clear matching automation, expired auth windows, or off-network clearings finding their way back in.
- Pull fallback transaction counts by terminal where you can get the data. Identify aging hardware. Decide pass-through, terminal refresh push, or absorption per merchant.
For both fees, the merchant conversation is easier than usual because the operational fix is concrete. Replace a terminal. Tighten an auth-clear window. The fee disappears, it doesn't just get recovered.