EU VAT Brain: Primary Registration and Reverse Charge Controller
The Opportunity
Advanced EU VAT logic that respects fulfillment origin and lets merchants set a primary registration for cross-border B2B reverse charge. It validates VAT IDs, determines correct tax treatment even with multiple registrations, and applies zero-tax where eligible.
"EU merchants registered in multiple countries cannot force reverse charge when shipping cross-border from a single fulfillment location; Shopify often applies destination VAT because a local registration exists, causing incorrect taxation."
Market Validation
Detailed Analysis
Proposed Solution
A tax app that lets merchants designate a primary fulfillment registration per location, validates buyer VAT via VIES, and applies reverse charge when goods move cross-border and criteria are met. It overrides tax using Shopify’s tax app platform where supported, or applies per-order tax-exempt logic with robust evidence records and compliant invoicing.
Target Audience
EU B2B merchants with multiple VAT registrations fulfilling from a single country (e.g., DE warehouse serving CZ customers).
Competitive Landscape
Exemptify, Sufio, Quaderno, Avalara AvaTax (Plus), VAT Validation apps
Implementation Notes
Leverage Shopify Tax Platform/Functions when available to supply per-order tax results; otherwise implement VAT-ID capture via Checkout UI extension, validate in real time against VIES, and determine tax rules using merchant-defined primary registration tied to fulfillment origin; for unsupported checkouts, create draft-order or cart-based exemptions and add reverse-charge notes; store audit evidence (VAT ID, validation timestamp, IP/geolocation, shipping docs); support OSS/IOSS mappings; add invoice generation with reverse-charge wording; handle edge cases (multi-location fulfillment, partial shipments) and provide reporting/reconciliation exports.
Evidence from Merchants
Real quotes from Shopify community forums
"CZ B2B customer with valid CZ VAT ID should qualify for reverse charge (DE→CZ cross-border), but Shopify applies CZ local VAT instead because a CZ registration exists."
Key Pain Points
Issues with VAT application for cross-border transactions.
criticalMentioned by 1 merchants
Impact: Potential loss of revenue due to incorrect VAT charges.
Market Metrics
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