ESIR or L-PFR: what you actually need for fiscalization
The difference between ESIR and L-PFR explained simply — what each does, whether you need both, and how to pick a register that ties it all together.
When you start fiscalizing, the first things you hit are two acronyms: ESIR and PFR (usually L-PFR). They sound complicated, but they’re really two halves of one job — one creates the receipt, the other signs it and sends it to the tax office. Here’s the difference in plain language.
What ESIR is
ESIR (the electronic invoicing system) is the program you actually work in — you pick items, quantities and the payment method, and it assembles the receipt. It can be an app on a phone, tablet or computer. It’s the part you look at all day, so speed matters: fewer clicks per receipt means a shorter queue.
What L-PFR is
L-PFR (the local fiscal receipt processor) is the part that fiscalizes the receipt: it signs it with the security element, gives it a unique number and a QR code, stores it and sends it to the Tax Administration. „Local" means it runs on your device, so it works even with no internet — stored receipts go out as soon as the connection returns. There’s also a V-PFR (virtual) that runs in the cloud but needs a constant connection.
Do you need both?
Yes — fiscalization always needs both an ESIR and a PFR, plus a security element. But that doesn’t mean wiring three things together by hand. Good software registers come with it all connected, so you just ring up the sale and the rest happens in the background.
Tezga eKasa is an ESIR built to be fast at issuing receipts, working with an approved PFR — you issue the receipt, and fiscalization, the QR code and sending to the tax office happen on their own. No ten clicks per receipt, no thinking about „who signs what".
Key takeaways
- ESIR creates the receipt, PFR signs it and sends it to the tax office
- L-PFR works offline; V-PFR needs a constant connection
- You always need both + a security element — but a good register ties it together for you
Frequently asked questions
They can. Many software registers include both an ESIR and an L-PFR, so you use them as one whole and never think about the split.
It’s a card or file that signs receipts and identifies you as the taxpayer. Without it the PFR can’t fiscalize a receipt.
What you get with Tezga eKasa
- An ESIR working with an approved PFR — no manual wiring
- Works offline and syncs by itself
- A valid QR code on every receipt
- Guided connection of the security element
Read more
e-Invoicing in Serbia 2026: who must comply, deadlines, and how → The KPO book for flat-rate entrepreneurs: what it is, the 6M limit, how to keep it → Fiscalization for freelancers and service businesses: what you actually need →Try Tezga eKasa free
Fiscal receipts and e-invoices for service businesses — a register that keeps it simple.