In 2019, Deloitte faced a dilemma. Their consultants in Hungary needed to adapt to sudden tax law changes, but their existing systems were insufficient. ALLWIN stepped in to upgrade their tax calculator tool, starting with Hungary and later expanding to the Czech Republic.

The need

As a global audit, financial and tax advisory firm, Deloitte has over 300,000 consultants working in 150 global territories. However, when tax laws underwent changes, the consultants in Hungary faced challenges in adapting to the new requirements. Despite the limitations of Deloitte's existing software, ALLWIN came to the rescue, offering a tailor-made solution to address the issue at hand.

Business goals

Deloitte accountants needed to submit tax returns for expats deployed to Hungary. And while they had access to tax calculation software, it couldn’t configure the sudden rate changes associated with new changes to social tax laws. Deloitte’s goal was to find a development partner to reconfigure these rate and legal changes and improve their processes.


ALLWIN began the project by conducting a thorough assessment of systems, applications, tax laws, and requirements.

Following this, a team of six skilled software developers collaborated closely with tax experts and lawyers to understand the intricacies of the existing tool.

With a commitment to an agile methodology encompassing continuous testing, pipelining, and upgrading, our consultants successfully developed a customized process that effectively addressed Deloitte's unique business needs.

Azure DevOps

ALLWIN used Microsoft’s integrated online platform to consolidate systems into an Azure environment. And with the code base and continuous delivery pipelines based in Azure DevOps, our developers began testing,
and using pipelines to upgrade systems.

Upgraded GES
(Global Employer Services)
calculation tool

Our team developed Deloitte’s existing tax calculation tool to align with Hungarian tax requirements. This included integrating a data export functionality with the National Tax and Customs Administration website.

Expert Panel

ALLWIN amassed an expert team of local tax, legal and advisory consultants to support with testing and development. And through a process of continuous feedback with the group, we designed and built new calculations into the enhanced software. Using the expert skills of this group, we carried out a rigorous process of testing to optimize functionality.

Continuous Improvement

To ensure high usability for Deloitte staff, members of our team led on a review of workflows and processes. This included designing a set of questions to test usability.

Our team also ensured the successful submission of individuals’ tax reports to local authorities. Plus, we optimized the uploading of data files to the accounting authority’s website.

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Deloitte Hungary's partners welcomed our upgraded software as a reliable and effective tool for calculating and submitting tax returns for their clients.

By integrating all software onto Azure DevOps, we created the optimal environment to test, develop and upgrade their existing tax calculation tool. Through collaboration with experts, we developed automated workflows, improved usability, and ensured compliance with tax and financial authorities.

This success led to expanding our services to Deloitte in the Czech Republic. By consulting with local experts, we customized the software to align with the Czech Republic's financial systems, providing a comprehensive solution for Deloitte in both countries.

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