OO ‑ EU Tax exemption vs Tax Rex ‑ Sales Tax Automationfor Shopify (2026)
OO ‑ EU Tax exemption and Tax Rex ‑ Sales Tax Automation address distinct tax compliance challenges for Shopify merchants. OO ‑ EU Tax exemption focuses on simplifying VAT compliance for businesses selling to other EU businesses (B2B) within the European Union, automating VAT ID validation and tax exemption during checkout. Its key strengths lie in its focus on EU VAT regulations, automation of VAT exemption, and claimed ease of use and customizability, designed to improve B2B sales efficiency. Tax Rex, in contrast, targets US sales tax complexities, offering solutions for sales tax reporting, automated filing, and economic nexus tracking for US states. Tax Rex aims to simplify the multifaceted sales tax requirements of the US market, helping merchants manage filing deadlines, and state registration requirements. While both apps share a 5/5 rating, Tax Rex has significantly more reviews (91) compared to OO ‑ EU Tax exemption (6), indicating a potentially larger user base and wider adoption. Therefore, the appropriate choice depends entirely on the geographical market served by the merchant and the specific tax regulations that need addressing.
At a Glance
OO ‑ EU Tax exemption
6 reviews
Tax Rex ‑ Sales Tax Automation
91 reviews
Detailed Overview
OO ‑ EU Tax exemption
VAT ID validation & automatic tax exemption, boosting merchant efficiency and European B2B sales!
Key Features
- Automatic EU Tax exemption
- VAT validation via the official VIES platform
- Fully translatable and customizable
- Easy to install and use
- Extensive integration options (e.g. for invoices)
Tax Rex ‑ Sales Tax Automation
US State Sales Tax return Reports & Automated Filing for your store. Easy, Accurate & Time Saving!!!
Key Features
- Timely Autofile: Ensure on-time tax return filings while you focus on business
- Accurate Tax Reports: Precise sales tax reports tailored to state's requirements
- Economic Nexus Alerts: Stay informed on new state nexus thresholds
- Effortless State Registration: Simplified new state registration for compliance
- Ability to Ignore orders imported from Marketplaces like Amazon, Ebay, etc
Feature Comparison
| Rating | 5/5 | 5/5 |
Rating OO ‑ EU Tax exemption5/5 Tax Rex ‑ Sales Tax Automation5/5 | ||
| Reviews | 6 | 91 |
Reviews OO ‑ EU Tax exemption6 Tax Rex ‑ Sales Tax Automation91 | ||
| Target Market | EU-based merchants selling B2B within the EU | US-based (or selling into the US) Shopify merchants |
Target Market OO ‑ EU Tax exemptionEU-based merchants selling B2B within the EU Tax Rex ‑ Sales Tax AutomationUS-based (or selling into the US) Shopify merchants | ||
| Tax Focus | EU VAT exemption for B2B sales | US State Sales Tax reporting and filing |
Tax Focus OO ‑ EU Tax exemptionEU VAT exemption for B2B sales Tax Rex ‑ Sales Tax AutomationUS State Sales Tax reporting and filing | ||
| Key Automation | Automatic VAT ID validation and tax exemption at checkout | Automated sales tax return filing and economic nexus monitoring |
Key Automation OO ‑ EU Tax exemptionAutomatic VAT ID validation and tax exemption at checkout Tax Rex ‑ Sales Tax AutomationAutomated sales tax return filing and economic nexus monitoring | ||
| Geographic Scope | European Union | United States |
Geographic Scope OO ‑ EU Tax exemptionEuropean Union Tax Rex ‑ Sales Tax AutomationUnited States | ||
| Core Functionality | EU VAT compliance | US Sales Tax Compliance |
Core Functionality OO ‑ EU Tax exemptionEU VAT compliance Tax Rex ‑ Sales Tax AutomationUS Sales Tax Compliance | ||
| Ease of Use (Claimed) | Easy to install and use | Easy, Accurate & Time Saving |
Ease of Use (Claimed) OO ‑ EU Tax exemptionEasy to install and use Tax Rex ‑ Sales Tax AutomationEasy, Accurate & Time Saving | ||
Our Verdict
The choice between OO ‑ EU Tax exemption and Tax Rex depends entirely on the merchant's target market and tax compliance needs. If you are a Shopify merchant selling B2B within the European Union and need assistance with VAT ID validation and exemption, OO ‑ EU Tax exemption is the clear choice. Its focus on EU regulations and VAT automation directly addresses this need.
Conversely, if your business is based in the US, or sells extensively into the US market, and struggles with the complexities of US state sales tax reporting and filing, then Tax Rex is the more suitable option. Its features are designed specifically to navigate US sales tax laws, including economic nexus monitoring, automated filing, and generating accurate reports.
Common Questions
Which app is better for a merchant selling both in the EU and US?
Neither app comprehensively covers both EU VAT and US Sales Tax. A merchant selling in both regions would need *both* apps (or a combination of apps) to cover all their tax compliance requirements.
Does OO - EU Tax exemption handle all types of VAT?
Based on the description, it focuses on VAT exemption for B2B sales within the EU. It doesn't mention broader VAT management for all sales types.
Can Tax Rex help me understand where I have economic nexus?
Yes, Tax Rex includes an economic nexus dashboard to help merchants stay informed about state nexus thresholds.
Are both apps easy to set up?
Both apps claim to be easy to use, but user experience can vary. OO ‑ EU Tax exemption states 'Easy to install and use'. Tax Rex describes itself as 'Easy, Accurate & Time Saving!!!'.
Which app is better for saving time?
Both apps claim to save time. OO ‑ EU Tax exemption automates VAT validation. Tax Rex automates report creation and filing. The better time-saver depends on which aspect of tax compliance is more time-consuming for the merchant.
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