Pain points of VAT number validation – and why tax teams are feeling the pressure

For tax professionals, validating VAT Registration Numbers (VRNs) isn’t optional. In many jurisdictions worldwide, including across the EU, it’s a legal requirement.

Yet despite this, many organisations, even globally recognised brands, still struggle to get it right.

Why? Because VRNVAT Registration Number identifies a taxable business or non-taxable legal entity that is registered for VAT. validation sounds simple in theory, but in practice it’s anything but.

We’ve gathered 4 of the biggest pain points tax professionals are facing and how we can resolve them.

“Tax owns the compliance, but not the data”

This is probably the biggest issue we see.

Tax professionals are ultimately accountable for compliance, but they don’t usually own the data. VRNs are captured and maintained by multiple teams – onboarding, accounts payable, procurement, IT, sometimes even separate master data teams.

That means:

• Data lives in multiple systems
• Formats are inconsistent
• Updates don’t always flow through
• And no one really owns the full end-to-end process

Tax teams are responsible for the outcome, but they’re relying on data and systems they don’t control. That mismatch between responsibility and ownership creates risk, even when everyone is trying to do the right thing.

“Fixing at scale is hard”

Many organisations still rely on manual processes to validate VAT numbers. Staff members often have to manually check VAT numbers one by one on tax authority portals.

It technically works but it’s slow, error-prone and completely unsustainable.

“Checking every 3 months is unrealistic”

VRN data isn’t static. Numbers can change, be revoked, or become invalid over time. That means validation isn’t a one-off exercise; it needs to be continuous. Trying to manage that manually, especially across multiple jurisdictions, quickly becomes unmanageable.

“Where’s the proof?”

Even when checks are being done, another problem often emerges during audits: proving it.

If your process involves jumping between different tax authority portals, taking screenshots, and saving files locally, you end up with fragmented evidence that’s hard to maintain and even harder to retrieve under pressure.

When auditors ask:

• When was this VRN checked?
• What was the result at the time?
• Has it been revalidated since?

Those answers need to be clear, consistent, and defensible.

What’s the worst-case scenario?

The risks of getting VRNs wrong are far from theoretical.

Worst-case consequences include:

• Denied VAT recovery
• Financial penalties and interest charges
• Costly audits
• Reputational damage
• Increased scrutiny from tax authorities

In some jurisdictions, businesses may even face joint and several liability or accusations of facilitating VAT fraud – if they cannot demonstrate adequate due diligence.

Add ViDAViDA or 'VAT in the Digital Age', is an EU initiative proposed by the European Commission that seeks to modernise and harmonise VAT processes for member states, by embracing new technologies. It is aimed at updating processes for the management of VAT, and reduce the VAT gap and fraud. The proposal also aims to address challenges in the area of VAT raised by the development of the platform economy. into the mix…

With initiatives like ViDA (VAT in the Digital Age), the rise of e-invoicingElectronic invoicing - widely referred to as e-invoicing - is the exchange of a digital document between a supplier and a buyer. E-invoices are issued, transmitted and received in a structured data format that enabled automatic and electronic processing. They contain data in a machine-readable format so that an AP system can read an invoice without manual data entry, leading to faster and more efficient invoicing., and increasing scrutiny of transactional data, tax authorities now expect:

• Real-time or near-real-time validation
• Consistent, high-quality data
• Clear audit trails and controls

The margin for error is shrinking fast.

Resolving the pain

We didn’t build this tool because we thought it was a nice-to-have.

We built it because we were seeing the same problems again and again:

• Fragmented ownership of VRN data
• Manual, inconsistent validation processes
• Lack of audit trails
• Legacy systems that weren’t designed for today’s compliance requirements

LimeLyte® Entity Manager was designed to give tax teams a central place to validate, monitor, and manage VRNs – whether that’s through bulk uploads, continuous revalidation or provide clear audit trails.

You can choose between the full standalone platform, ERPEnterprise resource planning (ERP) is a type of software that organisations use to manage main business processes. plug-ins, or APIs that integrate directly into existing systems.

Want to see how it works in practice?

If any of this sounds familiar, the easiest way to understand how LimeLyte® Entity Manager helps is to see it in action.

Book a demo to walk through the platform, see how VAT number validation works at scale, and explore how it fits into your existing systems and processes.