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4. Submitting online invoicing data

If you work through OCTO, we issue invoices to OCTO on your behalf every 2 weeks through self-billing, so you don't have to deal with invoicing.

Our proprietary, internal invoicing system automatically prepares invoices after each payment cycle and sends them to you (or directly to your accountant if you've set it up that way) via email.

From August 1, 2025, every issued invoice must immediately be entered into NAV's online system, so we are also preparing our invoicing system for this task.


IMPORTANT: From August 01, 2025, only professionals who have a valid NAV online invoice connection can receive tasks through the OCTO app!


In order for us to submit invoices to NAV's online system on your behalf, we need your help too!

To create API keys, please follow these steps.

(IMPORTANT: if you have already registered in NAV's online invoice system, skip the first step, log in and create a new technical user):


Registration

  1. Go to NAV's online invoice page: https://onlineszamla.nav.gov.hu/home
  2. Click the 'Login' button, log in as Primary user
  3. Read the data protection notice and check the box
  4. Select taxpayer registration
  5. Log in with your Ügyfélkapu credentials
  6. Complete client registration: provide your personal data and your 10-digit tax identification number
  7. Under registration type, select whether you are a business organization or sole proprietor (individual)
  8. Upon successful representation rights verification, the previously chosen username appears, then password entry and confirmation is required
  9. Then provide your email address, phone number, and contact language
  10. After successful registration acceptance, the main page appears


Creating a new technical user

  1. Go to the 'Users' page
  2. Select the 'New user' panel and click on the 'Technical user' option
  3. To finalize adding the technical user, provide any password
  4. Check the 'Invoice management' and 'Invoice queries' options
  5. Click the 'Save' button and the technical username is automatically created
  6. By clicking the 'Key generation' button at the bottom of the 'Details' tab, you can create the XML signing and XML exchange keys


Submitting data

  1. Go to the 'Online invoice data request' page: http://wolt.me/online-szamla-adatok
  2. Fill in your data
  3. Using 'Ctrl c & ctrl v', copy the technical user, the provided password, XML signing and XML exchange keys


Help:

https://onlineszamla.nav.gov.hu/technikai_kerdesek_valaszok

https://www.youtube.com/watch?v=IiGARAozR4Y&feature=emb_title


ATTENTION:

We cannot accept existing online invoice registration data (registration data from számlázz.hu and other invoicing programs are not suitable). You must create a new technical user and submit that data!



Updated on: 02/09/2025

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