Match of postman and software

Must the delivery-service provider match the provider offered by my accounting software?

Short answer

No. The delivery-service provider is selected through the Slovak Financial Administration portal independently of the accounting or invoicing software used. Choosing the provider already integrated with the software may simplify automation, but neither the law nor Peppol requires the two suppliers to match. If different suppliers are chosen, confirm whether their combination supports automatic exchange, export and import, or an API integration; availability varies and was still developing in mid-2026.

It is not a condition

The choice is independent

You choose the postman provider through the FS SR portal, regardless of which accounting software you use.

Same provider

The simplest scenario

e-invoices are delivered directly and automatically to your accounting software without any further setup.

Another provider

It depends on the integration

e-invoices go to this provider; they will go into the software automatically only if there is a ready integration between them.

Verify with both parties

Recommended step

Check with the software supplier and with the postman provider whether there is already a link between them.

Detailed explanation

Selecting a e-invoicing delivery-service provider via the Slovak Financial Administration portal and choosing accounting or invoicing software are two independent decisions — one does not depend on the other. For example, you can use accounting software that has its own certified e-invoice provider, whilst still registering a completely different provider via the Slovak Financial Administration portal. Neither the law nor the technical architecture of Peppol requires such consistency.

The difference lies in how the received e-invoice actually reaches you. If the provider registered in the Central Metadata System (SMP) for your company registration number (IČO) matches your software’s e-invoicing delivery-service provider, delivery is usually direct and automatic without any further configuration. If you choose a different provider, whether the e-invoice is automatically transferred to your software depends on whether a ready-made integration already exists between that specific provider and your specific software — not simply on the fact that they are ‘different’. Several e-invoicing delivery-service providers offer public REST APIs or webhooks for this purpose, through which a connection can be established; in practice, however, this only works where someone (the software supplier, the e-invoicing delivery-service provider, or the accountant themselves) has actually set up this connection. As of mid-2026, support for this varies between individual Slovak accounting systems and is still being developed — some solutions already have a native connection in place, whilst others currently only work via manual XML export/import. It is therefore most reliable to verify a specific combination directly with both the software supplier and the e-invoicing delivery-service provider, rather than relying on general statements such as ‘it always works’ or ‘it never works automatically’.

As set out in the Act

The obligation to arrange for a digital mailbox to receive e-invoices arises from Section 76a of Act No. 222/2004 Coll. on VAT, as amended by Act No. 385/2025 Coll. However, the Act does not stipulate that this provider must be the same as the supplier of the accounting or invoicing software — this is merely a matter of practical integration, not a legal obligation. Nor do the official methodological and information materials of the Slovak Financial Administration on e-invoices mention such a mandatory alignment.

Practical examples

A company uses accounting software with its own mail server and chooses the same provider — e-invoices are delivered directly to the software without any further steps.
The company uses accounting software other than that primarily supported by the e-invoicing delivery-service provider, but there is a ready-made API integration between the two — e-invoices are still delivered automatically.
The company chooses a provider that does not yet have a ready-made connection with its specific software — received e-invoices must be imported into the software manually (export/import) until the integration is completed.

Most common mistakes

“I must use the same provider as the one offered by my software, otherwise I won’t be able to receive e-invoices.” You can receive them in any case — the only question is whether they will be imported into the software automatically, or whether you’ll need to import them another way.
“If I choose a different provider, I’ll always have to download and import invoices manually.” Not necessarily — many providers offer API/webhook integrations, and some provider-software combinations already work automatically; you need to check this for your specific software, rather than assuming either extreme.
“Matching providers is a legal requirement.” It isn’t; it’s merely a recommendation to simplify integration.

Conclusion

The providers do not have to match. Select freely through the Financial Administration portal, but verify the actual integration with both the software supplier and the delivery-service provider.

Legal basis

Act No. 222/2004 Coll. on VAT, Section 76a (as amended by Act No. 385/2025 Coll.)