At a glance
Percentage of attempted Square payments that failed (issuer-declined, fraud-flagged, terminal-rejected). The complement of success rate. POS card-present declines are rare (<1%); Square Online declines run 4, 8% on healthy traffic. Spikes signal issuer-side fraud filters, BIN-range issues, 3DS friction, or terminal hardware problems.
Calculation
Calculated automatically from your Square data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.Worked example
7-day window for a US Square merchant running POS + Online:- Online at 7.5% is at the upper edge of healthy. The 4, 8% range is normal CNP traffic; >8% triggers the alert.
- POS at 0.6% is very healthy. Card-present declines are nearly always genuine (insufficient funds, lost / stolen, expired). Above 2% suggests terminal connectivity or a chip-reader fault.
- 9 cancellations on Square Online. These are NOT in this card; they live in the cancel-rate metric. Most are 3DS abandons.
- Cash App Pay at 2.4% is high for that channel. Block’s filters are typically tight.
Sibling cards merchants should reference together
Reconciling against the vendor’s own dashboard
Where to look in the Square Dashboard:Reports → Transactions with status filter “Failed”. Compare the count to the same window’s “Completed” count.Common divergences:
Cross-connector reconciliation: Stripe and Square decline rates for the same business diverge typically by 1, 3pp due to acquirer routing differences. Compare
stripe.stripe_decline_rate for the multi-rail view.
Known limitations / merchant FAQs
“Decline rate spiked overnight, what to check first?” Opensqu_top_decline_reasons. Common patterns: (1) issuer-side fraud filter wave (cluster of CARD_DECLINED from one BIN), (2) bad-traffic ad campaign, (3) Square Risk tightened.
“POS decline rate at 3%, why?”
Above 2% on POS is a hardware or connectivity flag. Likely candidates: chip reader needs replacement, Wi-Fi unstable at the till, NFC antenna interference.
“Are 3DS abandonments declines?”
No. 3DS-abandon is CANCELED and tracked in squ_threedsecure_abandon_rate. Issuer-rejected 3DS challenges are FAILED and count here.
“My subscription rebill failures, do those count?”
Yes. Each failed rebill is one decline. Square Subscriptions retries over 3, 7 days; recoveries flip to COMPLETED and stop counting.
“Why is Square Online decline higher than my chip + tap?”
CNP has more issuer + 3DS + Square Risk evaluation. CP is mostly procedural. The 5, 8 percentage point gap is universal.
“Cash App Pay declines, do those have unique reasons?”
Yes. Insufficient Cash App balance, expired linked card, Block buyer-side risk decline.
“My multi-location merchant has very different rates per location, normal?”
Yes. Locations in different states or different demographics see different traffic quality.