KSeF e-Invoicing: How to Set It Up in Ovoko – Ovoko.com

Starting April 1st, 2026 the National e-Invoicing System (KSeF) became mandatory for many businesses in Poland. To stay compliant and continue using the Ovoko built-in invoice generator, you should add your KSeF token directly to your account settings. This article explains what KSeF is, what you need to do, and answers the most common questions.

1. What is KSeF?

KSeF (Krajowy System e-Faktur) is Poland's National e-Invoicing System, operated by the Polish Ministry of Finance. It is a centralised platform for issuing, receiving, and storing VAT invoices in a structured XML format. Once registered in KSeF, every invoice your business issues is automatically submitted to and recorded by the ministry.

2. Is KSeF mandatory for my business?

As of April 1st, KSeF became mandatory for many businesses operating in Poland. If your company is VAT-registered in Poland, you are likely required to issue invoices through KSeF. We recommend checking with your accountant or tax advisor to confirm your specific obligations.

3. How do I generate my KSeF token?

You can generate your KSeF token through the official Polish Ministry of Finance portal. If you are unsure how to do this, please refer to the official KSeF documentation or ask your accountant for assistance.

4. Do I need to change anything in my Ovoko account?

Yes. To continue issuing compliant invoices through the Ovoko built-in invoice generator, you need to connect your account to KSeF by adding your KSeF token in your settings. Without this step, invoices generated by Ovoko will not be submitted to the National e-Invoicing System.

5. What do I need before setting up KSeF in Ovoko?

Before you begin, make sure you have:

A valid VAT number (NIP) saved in your Ovoko account — KSeF registration is not possible without it.
Your KSeF token — you can generate this in the KSeF portal.

Important: If your company's NIP is not yet saved in your Ovoko account, please add it before proceeding with the KSeF setup.

6. How do I add my KSeF token in Ovoko?

Follow these steps to connect your account to KSeF:

Go to Settings → Invoicing.
Paste your KSeF token into the configuration field.
Click Verify Token.
Click Save to apply the changes.

Once saved and verified, your Ovoko account is connected to KSeF and ready to automatically submit invoices.

7. What happens after I configure my KSeF token?

Once configured, every invoice generated through the Ovoko built-in invoice generator will be automatically submitted to the National e-Invoicing System. The structured XML file for each invoice will be registered with the Polish Ministry of Finance — no manual submission needed on your part.