What is a PRRO and how to connect it in 2026

Software fiscal registrars (PRRO) have become the standard for most Ukrainian businesses. If you are opening a store, café, or online business in 2026, you need to sort out the PRRO before making your first sale. In this article, we explain in simple terms: what it is, how it differs from a hardware fiscal registrar, how to choose a service, and how to connect step by step without facing fines.

What is a PRRO in simple words

A PRRO is a program that performs the functions of a cash register. It generates fiscal receipts and transmits sales data directly to the servers of the State Tax Service (STS) via the internet. Instead of a physical cash register, you use a smartphone, tablet, laptop, or POS terminal with the application installed. Each receipt receives a fiscal number from the STS, and the buyer can verify it in the Electronic Cabinet using a QR code.

The legal basis is Law of Ukraine No. 265/95-VR on the use of fiscal registrars in the field of trade and orders of the Ministry of Finance, in effect as amended for 2024-2026. A PRRO has the same legal force as a traditional cash register and likewise obliges you to comply with cash discipline.

Who is required to use a PRRO

Since 2022, the requirement to use a fiscal registrar or PRRO has extended to almost all sole proprietors who are single tax payers, except for group 1 and certain types of activity. If you accept payment in cash or by card for goods or services, in the vast majority of cases you need a PRRO. This applies to stores, cafés, hairdressers, auto service shops, online stores, and even mobile trade.

PRRO vs. hardware fiscal registrar: key differences

Cost. A hardware fiscal registrar costs from 6000 to 15000 UAH plus service center maintenance. Many PRRO services have a free plan or cost from 0 to 300 UAH per month.
Registration. A hardware fiscal registrar must be physically taken to a service center. A PRRO is registered online through the Taxpayer's Electronic Cabinet in just a few minutes.
Flexibility. A PRRO works on any device with internet access. You can have several registers at one location without additional equipment.
Internet dependence. A PRRO requires connectivity, but it has an offline mode: you can work without internet for up to 36 consecutive hours and no more than 168 hours per month; receipts are transmitted once the connection is restored.
Servicing. A hardware fiscal registrar requires a service center contract; a PRRO does not.

Overview of popular PRRO services

Checkbox

One of the most popular services in Ukraine. It offers a convenient app for Android and iOS, a web cabinet, and an API for integration with accounting systems and online stores. It suits both a single location and a chain. There is a free trial period and monthly billing. Its strengths are stability and broad equipment support.

Vchasno Kasa

A product of the Vchasno ecosystem that integrates well with electronic document management. It suits businesses already using Vchasno.EDO. Convenient for retail and the service sector, it has a clear interface and flexible pricing.

SmartKasa

A solution focused on easy setup and operation from a smartphone. It is often chosen by small stores, sole proprietors, and mobile traders thanks to minimal equipment requirements — a phone with internet is enough.

How to choose a PRRO service

Business type. For a takeaway café, a smartphone with SmartKasa is enough. For a supermarket, you need PRRO integration with a POS system and a barcode scanner.
Number of registers. Check how each additional register is billed.
Accounting integration. If you keep your books in BAS or 1C, choose a service with a ready-made API or integration module.
Equipment support. Whether it works with your fiscal printer, cash drawer, and scanner.
Technical support. How quickly you will get help if the register goes down during peak hours.

Step-by-step PRRO setup

Obtain a qualified electronic signature (QES). A QES from a bank, Diia.Signature, or an accredited center will work.
Register your business unit. In the Taxpayer's Electronic Cabinet, submit form 20-OPP with the details of your point of sale.
Register cashiers. Submit a notification about the persons who have access to the PRRO.
Register the PRRO itself. Submit an application using form 1-PRRO — the STS will assign a fiscal number.
Install the application. Download the service of your choice, log in with your QES, open a shift, and process the first test receipt.

Common mistakes

Forgetting to close the shift at the end of the day — this is a violation of cash discipline.
Not tracking the offline mode limit and exceeding 168 hours per month.
Not submitting the Z-report because they mistake a PRRO for a simple calculator.
Not giving the receipt to the customer — substantial fines are provided for this.

At SIRIUS, we help you choose a PRRO for your business and set up integration with your cash register, scanner, and BAS or 1C accounting system. We will handle registration with the STS, train your cashiers, and provide support. Get in touch — you will save time and avoid fines.