Step 2 of 4 · ProjectsBy jurisdiction

9 open source tax projects for Hungary.

Every project on the list for Hungary, grouped by kind. Global tools have a page of their own. Entries without a warning come first in each group; the labels mark what to check.

9 projects7 maintained7 on the map7 jurisdictions + globalFacts checked 6 Oct 2026

Browse these by tax area

Corporate tax VAT & indirect Cross-cutting

APIs

8 projects

Validation, rates, filings and registries you can call directly.

Mews.Fiscalizations.NET libraries that report e-invoices and receipts to six countries' fiscalisation systems, by a hotel vendor.APIAT · DE · ES · HU · IT · SE

NAV DCC-APISchemas and Java models of the Hungarian tax authority's DAC9 (GloBE return), DAC8 and CARF exchange API.APIHU · EU

NAV eRECEIPTPublic repository of Hungary's e-receipt (eNyugta) cash-register system: developer docs, XSDs and examples.APIHULicence unknown

NAV eVATPublic repository of Hungary's eVAT system: M2M interface docs, schemas and example XML for the VAT return.APIHULicence unknown

NAV M2MSchemas, example XML and Swagger specifications for machine-to-machine form submission to Hungary's NAV.APIHU

NAV Online InvoicePublic repository of Hungary's Online Invoice real-time reporting system: schemas, docs and examples.APIHU

NAV Online Cash Register logfilePublic repository of the service that downloads Hungarian online cash-register log files.APIHUInactive since 2023

NAV SAF-T HUPublic repository of the Hungarian SAF-T project: schemas and documentation, last changed in 2020.APIHUInactive since 2020

Automations

1 project

Reusable workflows for provisions, reconciliations and compliance runs.

NAV M2M XML editorJava desktop app for NAV M2M forms: XSD-based editing, validation and multi-form processing.AutomationHU

Labels mark what to check before you rely on an entry: inactive or archived code, demos, paid services and unclear licences. Only maintained projects for companies and tax authorities appear on the map. Search and filter the whole list.

Missing a project? Add it to the list.

Submit a project

Next · Step 3 of 4The gapsThe activities with no open project yet, and the partly covered ones, with what to build on.