Tax ID Number Validation: How to do it right & avoid tax risks
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Not validating Tax ID Numbers (TINs) leads to unnecessary financial risk. However, while tax professionals know that TIN validation is fundamental to tax compliance, it can be extremely cumbersome to perform.
Join Fonoa as they elaborate on why TIN validation is crucial and debate the age-old question of Build vs. Buy. They’ll be joined by Karina Ozer, Tax Manager, Data and Tech Strategy from Booking.com to moderate the debate – and offer insights into her own tax ID validation journey.
You’ll learn how to:
- Overcome challenges around TIN validation
- Manage TIN validation globally (beyond VAT & VIES)
- Weigh the pros/cons of Building and Buying
Fonoa’s team has built TIN validation solutions at leading technology companies, and they will share the good, the bad, and the ugly.
If your company is validating tax numbers – which you probably are – this is a must-watch.
Speakers
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Visit Karina’s LinkedInTax tech expert with 15+ years in Indirect Taxes, specializing in data and technology. Passionate about tax transformation, automation, and data-driven compliance.

Visit Alexander’s LinkedInFonoa's Tax Evangelist & Director of Tax Tech. Former Head of Tax Tech at Uber. Based in Croatia, passionate about global tax solutions, and that’s why he decided to join Fonoa.

Visit Rob’s LinkedInFonoa's Chief Tax Officer, ex-Head of EMEA Tax at Uber, with extensive tech consulting experience in US and EMEA. Based in Bucharest & Amsterdam.