Simple eInvoicing
From January 1st, 2026, eInvoice fiscalization becomes mandatory. Our system makes it simple and legally compliant.
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Legal obligations - who, what, and when
See which user groups are subject to mandatory eInvoice fiscalization and when the new regulations take effect.
VAT payers (B2B Companies)
As of January 1st, 2026, all VAT-registered businesses must fiscalize eInvoices in real-time through an authorized intermediary. With our system, this process is automated – no paperwork, no legal guesswork.
SMEs and Freelancers
Starting in 2026, you'll be required to receive eInvoices from your suppliers, and from 2027, issue them as well. Our solution helps you handle both easily, without extra steps or unnecessary complications.
B2C invoice issuers
From September 1st, 2025, all invoices – regardless of payment method – must be fiscalized, including card payments, bank transfers, and others. Our system enables you to handle it quickly, automatically, and in full compliance.
Accounting offices and bookkeepers
Your clients will need to receive and issue eInvoices starting in 2026, and you’ll need access to their fiscalized documents. With our system, everything is in one place – clear, secure, and ready to process.
Tiers and Pricing
Choose the tier that is right for you and your business
*price may vary on project requirements
*price may vary on project requirements
Why choose us?
More than just a tool – stable, scalable, and fully ready for Fiscalization 2.0
What our clients say
A very easy-going approach, listening to our requests and comments without taking them personally.
All deliveries were delivered on time and in the expected quality. The Gauss team had no trouble fitting into our management style and effectively communicating with our team members.
Gauss Development was able to finish the deliverables in a timely manner and in the expected quality. The end-users were pleased with the results. The team is skilled and experienced when it comes to intercompany cooperation.
Gauss Development was able to deliver all the outputs with minimal errors and on time. Their project management is great and they regularly hit deadlines. The team communicates using Cisco, WebEx, Cisco Meeting Virtual rooms, and their proprietary platform.
The entire process was very straightforward; Gauss did not complicate things more than necessary. They were very patient in explaining everything that was outside of our domain. We understood each other easily, which is not often the case when marketing and IT sectors come together. They were accessible and quick in their responses.
Gauss team actively contribute to different scenarios and technical approaches to system requirements, utilizing corporate standards to address challenges related to both development and business processes. Gauss is friendly and service-oriented, but also stringent when it comes to performance and delivery, whether it's our own team or Gauss employees.
Our initial goal was to get an initial solution off the ground. We ended up with a comprehensive reporting platform that enabled us to evolve our market offering from survey reporting to bespoke automated assessments and automated consulting. This was enabled by good modular design and the continuity Gauss Development could offer.
Working in partnership on a project was a positive experience. We had no problems with the Gauss team in terms of communication and collaboration. The team brought valuable expertise, especially in terms of software development, and we appreciated their commitment to ensure the success of the project.
Gauss is the best design and development company I've ever worked with. In fact, I'm working with them on more brands. I cannot recommend this company enough. You will love working with them. They're fairly priced and extremely talented. No matter what I need, whether it's an app, a website, or a proprietary software solution, the only choice is Gauss.
They did basically, everything I imagined. Whether it is the redesign, mobile application, web development, hosting transfer, you name it. It is a delight to work with them because they are truly dedicated to the client's vision. I am happy to say I am going to continue to work with them.
We finished a successful project along with a partner and Gauss. Now we have great ongoing cooperation with Gauss for updates, and all necessary support for our app. We were very satisfied with their service and overall quality of the final product.
Collaborating with Gauss so far has been a highly positive experience. They have proven to be a reliable partner for both past and future projects.
We are extremely satisfied with the work Gauss has done for us. They are actually part of our team, working diligently and professionally on building an excellent product that meets the needs of our customers. They communicate well and have a highly skilled team, making them capable of addressing the requirements of our product.
We have been collaborating with Gauss for an extended period of time. With their flexibility, we were able to expand our team with their programmers. There was no distinction among the programmers; they worked closely together as a team. Gauss has a skilled, experienced, and reliable team that you can rely on.
We have a close collaboration with Gauss. Their team has helped us in developing new websites and features for six different websites. Gauss has provided us with the opportunity to directly engage with their highly skilled team of programmers. We highly recommend this company as a development partner.
Their big plans and ideas are impressive. Web shop sales practically blossomed, becoming the top seller among seventeen Ferivi stores.
They were top professionals in their work.
I must express my admiration for their direct, amiable, and transparent approach.
We have been treated like a strategic partner.
I particularly liked their communication, their way of working, and the job they did.
Thanks to Gauss, the product has been effective and easy to use on a daily basis.
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Got a project in mind? Let's talk business!
Schedule a meetingFrequently asked questions
Fiscalization of all B2C invoices is mandatory from September 1st, 2025, regardless of payment method. As of January 1st, 2026, all VAT payers must fiscalize eInvoices in real-time.
Yes. From 2026, receiving eInvoices is mandatory, and from 2027, issuing them as well. Our Start package covers both – hassle-free.
Start is ideal for small businesses and sole traders – it includes sending, receiving, and fiscalizing eInvoices plus a basic archive. Pro adds advanced modules for documents, projects, CRM, and team collaboration.
Yes. Our system supports integration with leading intermediaries, including Moj-eRačun and FINA eInvoice..
Absolutely. Invoices are stored according to regulations – with fiscal codes, digital signatures, and a minimum 11-year archive.
Yes – demo and consultation are free and non-binding. Setup typically takes 1 to 3 business days, and you can start using the Start package the same day.
