Supercharge your AI with VAT Tax Validator. Stop billing with invalid tax IDs.

Claude

ChatGPT

Cursor

Gemini

Windsurf

VS Code

JetBrains

Vercel

See Vinkius in Action

Works with every AI agent you already use

…and any MCP-compatible client

Connect to your AI in seconds.

VAT Tax Validator checks if a tax ID is valid for B2B invoicing globally. This MCP Server runs strict, local mathematical algorithms against European and international VAT/Tax numbers.

It stops your agent from generating illegal invoices or drafting fraudulent contracts by proving the number's structure and checksum instantly.

What your AI can do

Validate vat

Checks a given tax number string against country-specific algorithms to confirm if the VAT or Tax ID format and checksum are correct.

Validate European VAT Numbers

Checks the format and checksum of Value Added Tax numbers across all EU countries.

Check International Tax IDs

Validates tax identification formats beyond the EU, supporting a wider range of global corporate identifiers.

Enforce B2B Compliance

Ensures that any tax ID used by your agent for invoicing or contracts is structurally sound before proceeding with a payment action.

Ask an AI about this

Compatible AI Apps

OAuth 2.0 Compatible

Claude

ChatGPT

Cursor

Gemini

VS Code

JetBrains

Vercel

Zendesk

+ any other MCP app

Included with Plan

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AI Agent

VAT Tax Validator MCP Server: 1 Tool for Financial Compliance

Validate any global or EU tax ID against mathematical standards before your agent processes payments, invoices, or contracts.

Make your AI actually useful.

Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.

Start using VAT Tax Validator on Vinkius

Validate Vat

Checks a given tax number string against country-specific algorithms to confirm if the VAT or Tax ID format and checksum are correct.

Connect to your AI in seconds. Security and governance baked right in.

Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.

Claude AI

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL:

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.

Start a conversation

Open a new chat. The VAT Tax Validator integration is available immediately — no restart needed.

Antigravity

Configure Agent Environment

Open your Antigravity agent's workspace configuration or mcp-servers.json file.

Bind the Endpoint

Add the Vinkius endpoint URL to your agent's MCP connections list:

"mcp_servers": {
  "vat-tax-validator": {
    "serverUrl": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
  }
}

Provide your secure token in place of [YOUR_TOKEN_HERE] to ensure your agent requests are authenticated.

Execute

Start your Antigravity session. The agent will autonomously discover and utilize the VAT Tax Validator tools with full Vinkius guardrails applied.

VS Code Copilot

⚡

One-Click Install (Recommended)

In your Vinkius Dashboard, simply click the Add to VS Code button for this server. We'll automatically configure your local workspace.

Or configure manually

Open MCP Settings

Open VS Code, press Ctrl/Cmd + Shift + P, and search for GitHub Copilot: MCP Servers.

Add Server Config

Add the Vinkius endpoint configuration to your mcp-servers.json file:

"vat-tax-validator": {
  "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
}

Ensure you replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.

LangChain

Install Dependencies

Install the LangChain MCP adapters for your environment:

pip install langchain-mcp-adapters

Connect the Server

Use the SSEClient in LangChain to connect to the Vinkius managed endpoint:

from langchain_mcp_adapters.client import SSEClient

# Connect to Vinkius
client = SSEClient(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
tools = client.get_tools()

CrewAI

Define the Tool

Load the Vinkius MCP tools into your CrewAI agents:

from crewai import Agent
from mcp_crewai import MCPTool

# Connect securely to Vinkius
vinkius_tools = MCPTool(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")

# Assign to Agent
researcher = Agent(
    role='Data Researcher',
    tools=vinkius_tools.get_all()
)

Execute Task

Run your CrewAI process. The agent will autonomously route tasks to the Vinkius managed server.

Choose How to Get Started

Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.

Build Your Own

Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.

Import from OpenAPI, Swagger, or YAML specs
Create Agent Skills with progressive disclosure
Deploy to edge with MCPFusion framework
Built in DLP, auth, and compliance on every call
Real time usage dashboard and cost metering
Publish to catalog or keep private

Start building

Make Your AI Do More

Start with VAT Tax Validator, then connect any of our 5,000+ other servers whenever your AI needs more. One click, no limits.

Use this MCP plus 5,000+ others, all in one place
Add new capabilities to your AI anytime you want
Every connection is secured and compliant automatically
Track usage and costs across all your servers
Works with Claude, ChatGPT, Cursor, and more
New servers added to the catalog every week

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by JS VAT. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

VINKIUS INFRASTRUCTURE

Cloud Hosted

Managed infra

V8 Isolated

Sandboxed per request

Zero-Trust Proxy

No stored credentials

DLP Enforced

Policy on every call

GDPR Compliant

EU data residency

Token Compression

~60% cost reduction

Your data is protected. See how we built it.

Works with Claude, ChatGPT, Cursor, and more

The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.

This connection provides 1 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.

International billing shouldn't require three different compliance checklists.

Today, getting ready for an international invoice means consulting separate rulebooks: one for France, another for Italy, and yet a third for the UK. If your agent uses simple pattern matching, it has to juggle these rules manually—and it'll make mistakes.

With this MCP Server, you hand the tax ID to `validate_vat`. It handles all the math behind the scenes. You get a single, clean result that proves compliance across multiple countries without you writing a million lines of conditional logic.

VAT Tax Validator MCP Server: Verify Tax IDs & Compliance

Before this tool, the process was linear: gather data -> manually check rules -> wait for human review to confirm validity before calling Stripe. This bottleneck stalls entire billing cycles.

Now, `validate_vat` runs instantly as a synchronous step in your agent's workflow. The validation happens right there in the pipeline, stopping invalid data immediately and letting you move straight to action.

Support 24/7 support@vinkius.com ↗

Security Vinkius Trust Center ↗

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What your AI can actually do with this

The validate_vat tool checks a tax number string against country-specific algorithms, confirming whether a VAT or Tax ID format and checksum are mathematically correct. When you need to process B2B invoices or draft contracts, relying on simple pattern matching won't cut it; this server runs strict, local mathematical validation.

You should know that LLMs often hallucinate these checks, which is risky when your agent uses the data for legal documents or invoicing. This MCP stops that problem dead in its tracks by running validations against native V8 math functions—it gives you certainty.

When you feed this server a tax number and specify the country, the validate_vat tool doesn't just look at the letters; it runs an offline checksum check using algorithms specific to that region's tax structure. Your agent gets a clean result telling you if the ID is mathematically sound—no guesswork involved.

If you're dealing with European commerce, this server handles EU VAT numbers. It checks both the required format and the mathematical checksum across every single country in the Union. This means your agent can confidently generate invoices knowing those VAT numbers are valid for cross-border payments.

For global operations, the tool validates tax identification formats that go way beyond the EU scope. You're talking about supporting a wider array of international corporate identifiers. It handles structures from various jurisdictions so you don't have to build separate validation logic for every corner of the globe.

The whole point is enforcing B2B compliance. Before your agent executes a payment action or finalizes an invoice, you can ensure that every tax ID used is structurally sound. If it fails the check—if its checksum is off or its format is wrong—your workflow stops immediately, preventing you from generating illegal invoices or drafting fraudulent agreements.

This mechanism allows your AI client to treat tax validation like a hard mathematical truth, not just a text pattern. It's about proving the number works, period.

Built · Hosted · Managed by Vinkius VAT Tax Validator - Check Tax ID Compliance

Server ID 019e3906-400a-7090-b2f6-ece4faf74b97

Vinkius Inspector

Compliance Grade A+

Score 100/100

Report View Report ↗

Here's how it actually works

The bottom line is you get a reliable pass/fail answer based on mathematics, not fuzzy logic or pattern matching.

Feed the MCP Server the tax number and required country code (if applicable).

Your AI client calls the validate_vat tool, which executes the necessary country-specific mathematical validation.

The server returns a structured result indicating whether the ID passed the checksum test.

Who is this actually for?

The Accounts Payable Specialist who gets flagged by finance for incorrectly structured foreign invoices. The DevOps Engineer building automated B2B billing pipelines. Legal Operations staff who need to verify tax IDs on international contracts before they are signed.

Tax Accountant

Uses the tool to audit incoming transaction data, ensuring every foreign supplier provides a mathematically valid VAT number.

Billing Operations Manager

Integrates validate_vat into invoicing workflows (like Stripe or Xero) so that any attempt to create an invoice with bad tax data fails instantly.

Compliance Analyst

Runs batch checks on client lists of international partners to proactively identify and flag non-compliant tax IDs before a contract is drafted.

What Changes When You Connect

Avoid generating illegal invoices. By running validate_vat, your agent verifies the checksum of every European VAT number before calling an invoicing system like Stripe or Xero.

Cut compliance risk instantly. You don't have to trust general AI pattern matching; this tool uses strict, local mathematical algorithms to confirm tax ID validity.

Process diverse global data types. The validator handles both standard EU VAT IDs and other international corporate Tax IDs in one call.

Build reliable workflows. Your agent can check a list of 100 supplier IDs against validate_vat and only proceed with the batch if compliance is met.

Save time on audits. Instead of manually cross-referencing country tax rules, you pass data through validate_vat for an instant pass/fail report.

See it in action

01 01

Drafting a Cross-Border Invoice

A billing agent is creating an invoice for a supplier in Germany. Instead of proceeding, the agent first calls validate_vat with the German tax ID. The tool returns 'valid,' and the agent can safely proceed to create the record in Stripe.

02 02

Cleaning Up Supplier Data

The compliance team pulls a spreadsheet of 500 international supplier IDs. They pipe this list through validate_vat using a script, which immediately flags all non-compliant records for human review before onboarding.

03 03

Contract Drafting Check

A legal agent is generating an agreement that requires tax ID proof. The agent first uses validate_vat on the client's provided numbers. If it fails, the agent stops drafting and asks for a corrected number, preventing contract failure.

04 04

Automated Data Import

When importing records from an external ERP system into your database, the data pipeline runs validate_vat on every tax field. Only mathematically valid IDs are accepted, keeping your core data clean and compliant.

The honest tradeoffs

Using basic regex for validation

Anti-pattern

Assuming that if a number starts with 'GB' and has 12 digits, it must be valid. This is easily fooled by random strings that fit the pattern but are mathematically incorrect.

The Fix

Don't trust patterns. Call validate_vat instead. It runs the actual country-specific checksum algorithm for a guaranteed result.

Relying on LLM knowledge

Anti-pattern

Asking an agent to 'check if this VAT ID is valid' and trusting the conversational response. The agent might confidently hallucinate a correct answer.

The Fix

Always force validation through validate_vat. It provides the hard, mathematical proof you need, not just plausible text.

Using generic data validation libraries

Anti-pattern

Using an open-source library that validates tax IDs but doesn't account for specific country changes or updates. The check fails when local rules change.

The Fix

Use the specialized validate_vat tool, which is built on native V8 algorithms and keeps up with current compliance standards.

When It Fits, When It Doesn't

You MUST use this server if your agent's output affects financial records, invoices, or legal contracts. If you are dealing with any tax ID (VAT, GST, etc.), the risk of using an unvalidated number is too high to ignore.

Don't use it if all you need is simple formatting—for example, just checking if a field contains only letters and numbers. In those cases, basic type-checking is fine. However, if that data needs to be used in any cross-border financial action, validate_vat is non-negotiable.

Questions you might have

Does VAT Tax Validator support all European countries? +

Yes, it validates VAT numbers across all major EU countries using native V8 algorithms. It also supports certain international tax ID formats beyond the standard EU scope.

What happens if I pass an invalid number to `validate_vat`? +

The tool returns a structured JSON result, explicitly marking 'valid' as false and providing details about why the checksum failed. Your agent can read this error directly.

Can I use `validate_vat` for US tax IDs? +

While its core strength is EU VAT, the tool supports validating various international corporate Tax ID structures beyond just European standards.

Is using `validate_vat` faster than checking manually? +

Absolutely. It runs algorithmic checks in milliseconds, eliminating the need for human intervention or complex multi-step API calls to multiple regional databases.

How does `validate_vat` perform its algorithmic checks? +

It uses country-specific mathematical modulus algorithms. These aren't just format checks; they verify the number's internal consistency, which is required for proper B2B compliance.

What types of tax identifiers can `validate_vat` process? +

The tool validates both standard European VAT numbers and general international corporate Tax IDs. It handles various regional standards beyond just the EU format.

What input format should I use when calling `validate_vat`? +

You must pass the tax number as a raw string to the function. Your agent or client framework handles the necessary data type processing for validation.

How do I interpret the output JSON from `validate_vat`? +

The resulting JSON object provides explicit boolean and country context. You can use fields like 'valid' and 'country' to programmatically determine if an invoice can proceed.

Does it connect to VIES API? +

No, it checks the mathematical format (checksum) local. This guarantees sub-millisecond validation without network dependency.

Which countries are supported? +

All European Union member states (GB, DE, FR, IT, ES, etc).

Does it validate corporate names? +

No, it purely validates the mathematical format of the VAT number itself.

Connect to your AI in seconds.

Validate vat

VAT Tax Validator MCP Server: 1 Tool for Financial Compliance

Make your AI actually useful.

Validate Vat

Connect to your AI in seconds. Security and governance baked right in.

Claude AI

Open Claude Settings

Add Custom Connector

Start a conversation

Claude Code

Open your terminal

Add the MCP Server

Start coding

Cursor

One-Click Install (Recommended)

Open Cursor Settings

Add New Server

Use in Composer

Antigravity

Configure Agent Environment

Bind the Endpoint

Execute

VS Code Copilot

One-Click Install (Recommended)

Open MCP Settings

Add Server Config

Windsurf

One-Click Install (Recommended)

Open Windsurf Settings

Add Server Endpoint

LangChain

Install Dependencies

Connect the Server

CrewAI

Define the Tool

Execute Task

Choose How to Get Started

Build Your Own

Make Your AI Do More

Works with Claude, ChatGPT, Cursor, and more

International billing shouldn't require three different compliance checklists.

VAT Tax Validator MCP Server: Verify Tax IDs & Compliance

What your AI can actually do with this

Here's how it actually works

Who is this actually for?

What Changes When You Connect

See it in action

Drafting a Cross-Border Invoice

Cleaning Up Supplier Data

Contract Drafting Check

Automated Data Import

The honest tradeoffs

Using basic regex for validation

Relying on LLM knowledge

Using generic data validation libraries

When It Fits, When It Doesn't

Questions you might have