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NAV Online Számla

Ask your AI about your NAV invoices, in plain language

What is it for?

The NAV connector connects to the Hungarian Tax Authority's Online Invoice system. With a technical user login it can read invoice data, export XML, and verify VAT numbers, all through your AI agent in plain language.

onlineszamla.nav.gov.hu

Screenshot of the NAV Online Számla interface

/ use cases

What can you do with it?

No coding, no API docs. Just plain English.

📋

Monthly overview in seconds

Ask your AI: "Summarize September's incoming invoices broken down by VAT rate", done.

🔍

VAT number validation

Before invoicing a new partner: "Check VAT number 12345678-9-01", instant validation.

💰

Outstanding invoice tracking

"Which of my invoices haven't been acknowledged by NAV yet?", instant list with explanations.

📤

XML export for accountant

"Export October-December invoices as XML", it saves the file for you too.

/ tools

Available Tools (9)

Every tool can be invoked in natural language through your AI assistant.

read-only

Query (7)

These tools only read: they fetch data and never change anything.

query_taxpayer
Query taxpayer information from NAV by tax number. Returns company name, address, VAT status.
claude >Check VAT number 12345678
query_invoice_data
Get full invoice data by invoice number. Returns complete invoice details.
claude >Show me invoice INV-2024-001
query_invoice_digest
Search invoices with filters. Returns paginated invoice summaries by date range or original invoice number.
claude >List last month's incoming invoices
query_invoice_check
Check if an invoice exists in NAV system.
claude >Does invoice INV-2024-050 exist in NAV?
query_invoice_chain_digest
Query the modification chain of an invoice (original + all modifications/stornos).
claude >Show modification history of invoice INV-2024-001
query_transaction_status
Check the processing status of a previously submitted invoice transaction.
claude >What is the status of transaction TX-123?
query_transaction_list
List transactions within a date range.
claude >List all NAV transactions from this week

write

Actions (2)

These tools create or modify data. Query tools are always available; write tools can be toggled in the connector settings.

manage_invoice
Submit invoice data to NAV (create, modify, or storno). Accepts BASE64-encoded invoice XML.
claude >Submit this invoice XML to NAV
manage_annulment
Submit technical annulment for invoices.
claude >Annul invoice INV-2024-099 for technical error

/ examples

How to use your AI

Copy any of these commands into your AI assistant:

claude > List my incoming invoices from last month in NAV

claude > Summarize my 2024 outgoing invoices by VAT rate

claude > Check VAT number 12345678-9-01

claude > Which invoices haven't been acknowledged by NAV yet?

claude > Export all invoices from 2024 Q4 as XML

/ setup

3 steps and you're done

Add your NAV Online Számla credentials, copy the MCP URL, and your AI agent can query your data instantly.

No credit card. No hidden fees. Free tier stays free.