Cart abandonment: the technical half of the fix

The numbers, sourced

Baymard Institute, the most-cited checkout research body, puts average cart abandonment at 70.22% across 50 studies. Roughly 42% of those are "just browsing" and unrecoverable. The rest have named causes, and here is the part marketing emails cannot fix: the top reasons are technical and design decisions. Extra costs appearing late (40%), delivery too slow (20%), no trust at the card step (19%), forced account creation (18%), long or complicated checkout (17%), site errors or crashes (17%). A checkout that ships in the bottom half of those numbers pays the abandonment tax every day, and no email sequence out-recovers a checkout built to leak. The checkout-emergency page handles the day it fully breaks; this is the standing fix.

The fix list, mapped to the reasons

• "Extra costs too high" → show the full cost early. A shipping estimator on the product page or in the cart, before checkout. Surprise shipping is the single largest fixable abandonment cause, and hiding it to look cheaper is a decision to lose the sale later.
• "Long/complicated checkout" → cut the form to the bone. Baymard's testing puts an ideal checkout at 12–14 form elements (7–8 fields); the average US store shows 23.48. Every field is a decision someone abandoned: address autocomplete, sensible defaults, no "company" field on consumer stores, payment inside the checkout, not a redirect tour.
• "Forced account creation" → guest checkout, always. Offering account creation after purchase costs nothing and removes the 18%.
• "Didn't trust the site with card info" → visible trust, real signals. Recognized payment marks, a clean TLS padlock (no mixed content, the mixed-content fix applies), the return policy visible at the card step, and a checkout URL that stays on-domain.
• "Site errors/crashed" → the store gets tested after every change. The 17% who hit errors did not imagine them: expired certificates, broken payment webhooks, theme JavaScript throwing on mobile. The payment-failure triage and a post-change checkout test are the standing discipline.
• "Not enough payment methods" → wallets where the buyers are. Express wallets (Apple Pay, Google Pay, PayPal, UPI for India) remove the entire card form for the segment that uses them, the highest-leverage single addition on mobile.

The measurement half

Fixes without funnel data are vibes. The checkout gets instrumented step-by-step (view cart → begin checkout → shipping → payment → purchase), abandonment per step measured, fixes aimed at the largest leak first, and each step re-measured after, the same before/after discipline as every emergency on this site. Platforms differ: Shopify's checkout is largely platform-owned (the fixes live in shipping settings, apps and express wallets, the Shopify page covers the boundary); WooCommerce's checkout is fully yours and every fix above is direct work (the WooCommerce page). Honest boundary: this is the technical half, merchandising, pricing and copy are the other half. But a store losing 70% at checkout does not have a marketing problem first; it has a checkout problem. Bring the funnel numbers, the fix list prices itself.