NAV Online Invoice — Automatic, Real-Time Reporting with Bizonylat
Every Hungarian business must report all invoices to the NAV Online Invoice (Online Számla) system in real time. This has been mandatory since 2021 and applies to sole traders, LLCs, and all other business forms. Bizonylat fully automates this — issue an invoice, and the NAV reporting happens instantly in the background, on every plan including free.
Why is NAV Online Invoice reporting mandatory?
Hungary introduced the NAV Online Invoice system in 2018 to combat VAT fraud and improve tax transparency. Since 1 January 2021, all businesses must report every issued invoice — regardless of value or whether the recipient is a VAT-registered company.
Failure to report, or late reporting, can result in a default penalty from NAV. Automating this process eliminates the risk entirely.
In 2026, NAV is introducing additional validation rules. Bizonylat tracks all regulatory changes and updates the integration automatically — you don't need to do anything.
How automatic NAV reporting works in Bizonylat
- Issue the invoice in Bizonylat — fill in client details, line items, VAT rate, payment terms.
- Automatic validation — the system checks required fields, VAT codes, and invoice numbering before submission.
- Real-time submission to NAV Online Invoice via API.
- Status confirmation — Bizonylat shows whether the submission was accepted or if NAV returned an error (with a plain-language explanation).
- E-invoice delivery to the client by email — simultaneously with NAV reporting.
The entire flow typically takes a few seconds.
NAV changes in 2026 — what to expect
Several regulatory updates are taking effect in Hungary in 2026:
- E-receipt (e-nyugta) mandate — from 1 September 2026, businesses issuing receipts to private customers must report them to the NAV Receipt Registry. See our e-receipt page for details.
- Stricter XML validation — NAV is enforcing more fields in the 3.0 schema. Bizonylat handles this automatically.
- ViDA (EU) — the EU's VAT in the Digital Age package will gradually mandate structured e-invoicing across member states. Hungary is preparing for this transition.
All of these are handled in Bizonylat automatically. You will not need to update any settings.
What if NAV rejects a submission?
If NAV rejects a submission, Bizonylat shows a clear error message explaining the reason. Common causes:
- Missing or invalid tax number on the client record.
- VAT code not valid for the invoice date.
- Expired NAV API token (Bizonylat renews this automatically).
Fixing the issue and re-submitting is typically one click. If you need help, email support is available on all paid plans.
Frequently asked questions
What is the NAV Online Invoice system?
NAV Online Invoice (Online Számla) is Hungary's mandatory real-time invoice reporting system operated by the tax authority (NAV). Since 2021, every business must report all issued invoices to this system, regardless of value.
Does Bizonylat send invoice data to NAV automatically?
Yes. Every invoice issued in Bizonylat is automatically sent to NAV Online Invoice via API, in real time. No manual login, no XML upload required.
Is NAV reporting included in the free plan?
Yes. NAV Online Invoice reporting is included in every Bizonylat plan, including the free one. There is no paid add-on required.
What happens if the NAV API is temporarily unavailable?
Bizonylat queues the submission and retries automatically once the NAV API is back online. Invoice data is never lost.
How soon after issuing an invoice must it be reported to NAV?
The legal deadline is within 4 calendar days of issuance, but Bizonylat reports in real time — so you are always compliant without tracking any deadline.
Can I see whether my invoices have been successfully submitted to NAV?
Yes. Bizonylat shows the NAV submission status for each invoice: pending, successfully submitted, or error (with a description of the issue). You can also verify on the NAV portal at onlineszamla.nav.gov.hu.