About us

For over fifteen years, we have been helping our partners navigate the complex world of taxation. We offer more than just advice—we provide real solutions.

We specialize in taxation solutions

K-X Consulting is a 100% Hungarian-owned advisory firm. Our solid professional background has allowed us to become a stable partner to more than 100 domestic and nearly 50 international
companies.

In addition to tax advisory, our key areas of expertise include VAT and international VAT regulations, due diligence and tax audits, and supporting regulatory compliance. In these fields, it is not only up- to-date knowledge we are able to offer but also decades of practical experience.

We plan for the long term with our clients: our goal is not only to ensure compliance but also to create real business value. Companies that turn to us receive personalized advisory and clear professional communication instead of cookie-cutter solutions.

For us, consultancy means more than just interpreting legislation. We strive to think together with financial decision-makers and executives to ensure the best possible business decisions are
made—decisions that support our clients’; long-term objectives.

Meet our team!

Who are we, and why should you work with us?

Zsolt Nyári

Certified Tax Expert, Partner

Katalin Küsselné Lakatos

Senior Tax Manager

Júlia Kosztyó

Tax and Accounting Manager/CFO

Dóra Kardos

Senior Tax Manager

Helga Budayné Flaisz

Senior Tax Manager

Dr. Ivett Deák

Legal Advisor/Tax Manager

Dr. Máté Varga

Tax Manager

Krisztin Antal

Tax Manager

Dr. Tünde Papp

Tax Manager

Tünde Kalmár

Accounting Manager

Koltai Krisztina

Tax Manager

Ágnes Pásztor-Tamás

Tax Advisor

Dr. Szilvia Szakál

Senior Tax Advisor

Viktória Hubai

Senior Tax Advisor

Dr. Tamara Nemes

Tax Advisor

Éva Futakfalvi-Hart

Tax Advisor

Judit Kajtár

Auditor, Accounting Expert

András Attila Barsi

LegalTech Expert

Szilvia Várkonyi

Office Manager

Viktória Leinemann

Office Assistant

András Attila Barsi

LegalTech Expert

Szilvia Várkonyi

Office Manager

Viktória Leinemann

Office Assistant

Take the first step — we’ll take care of the rest.

If you’re not looking for empty answers but expect real solutions, feel free to contact us by filling out the form.

Our goal is to help you navigate risks and opportunities inherent in the tax system while providing practical, tailored solutions that help you achieve your objectives.

Contact Us

Zsolt Nyári

Certified Tax Expert, Partner

My professional career began in 2001 with international audit and consultancy companies. Before launching my own business in 2015, I spent 12 years with Mazars Kft, leaving them as a senior taxation manger. In addition to domestic and international tax consultation projects I was involved with responsibility in due diligence projects, tax audits as well as successful proceedings with domestic and international courts. With regards to the latter, I regard the biggest success of my professional career to be the VAT case (C-563/12) won at the European Court, for which I was the project initiator. I have been delivering presentations at tax conferences for over 10 years, have written a number of professional newspaper articles and blog posts, and have been a regular lecturer at the post-graduate training of certified accountants held by the Education Centre of the Hungarian Chamber of Auditors. Besides Hungarian, I also assist my clients in English and French.

Katalin Küsselné Lakatos

Senior Tax Manager

Between 2008 and 2017, I gained professional experience at international consulting firms, where I provided a wide range of tax advisory services to large corporations within international groups as well as Hungarian SMEs. I initially worked as a Tax Manager and later advanced to the position of Tax Director.

Beyond advisory services, I was actively involved in transfer pricing, tax audits, and the management of numerous tax-related obligations connected to statutory audits. I led compliance teams and successfully represented clients during comprehensive tax inspections and subsequent legal proceedings.

Since 2013, I have regularly delivered presentations at tax conferences, business breakfasts, and both internal and external professional training sessions.

Since 2017, I have been working as a tax expert at K-X Consulting Kft., providing tailored solutions to clients in both Hungarian and English.

Júlia Kosztyó

Tax and Accounting Manager/CFO

After obtaining my qualifications in Economics and Chartered Accountancy, I worked at a number of SMEs, first as an accountant and later as a chief accountant. In the interest of widening my field of expertise I completed my tax advisory qualification in 2008. I worked at Mondelez International group as a tax advisor from 2010; providing comprehensive taxation activities for numerous Hungarian subsidiaries and branch offices. During my career I have worked on a daily basis with a number of accountancy and business operations software programs such as SAP.

In 2018 I joined the K-X Consulting Kft. team on a full-time basis where I am primarily responsible for assisting my clients with questions relating to tax due-diligence, VAT inspections, tax return preparation, bookkeeping and accountancy, and SAP, in order to ensure they receive realistic and applicable solutions for their everyday activities.

Dóra Kardos

Senior Tax Manager

I started my career as a tax consultant in 2011 at Mazars Kft., where as a tax manager I was able to work with Hungarian subsidiaries of international groups of companies. I primarily led multi-tax projects, due diligence, and assisted my clients with tax investigations. I was able to represent Hungary in the international VAT group for several years, where I participated in cross-border VAT projects and planning tasks. Since 2014, I have been regularly published in specialist online journals, giving presentations at tax conferences, international training sessions and workshops. As a lecturer, I am also involved in the training of a certified sales tax experts from the Penta Union. I assist our clients in Hungarian and English.

Helga Budayné Flaisz

Senior Tax Manager

I spent the first 16 years of my carrier at EY Hungary, where I supported local and multinational companies in indirect tax matters as a tax consultant and later as a tax manager. I focused on VAT and green tax advisory, took part in cross-border VAT projects and tax audits, and in consultancy with the authorities, I made presentations at professional events.

In the period between 2016 and 2023, I worked for Andersen first as a tax manager before becoming a senior tax manager. At Andersen I broadened my experience in several fields of taxation in addition to VAT consultancy: I dealt with matters relating to direct taxation, to film and sport incentives, to R&D allowances, and I was involved in restructuring projects. During my work, I was able to co-operate with clients engaged in the manufacturing and trading sector, the automotive industry, the real estate sector, the film and media industry as well as with various sport organisations.

I joined the K-X Consulting team at the beginning of 2023, since when I have been assisting our clients by providing general tax consultancy services in Hungarian and in English.

Dr. Ivett Deák

Legal Advisor/Tax Manager

Until 2004 I worked at PWC, after which I obtained over 10 years of experience at NAV (Hungarian Tax Authority), where I worked in the KAIG (Large and Foreign Taxpayers Special Department). As well as interpreting laws, I also gained widespread experience in the course of numerous tax audit and tax collection procedures and the appeals procedures following these. I obtained experience in court case representation in the field of gambling, and I participated as a supervisory team member in the legislative work in relation to branch restructuring. In 2018 I joined the K-X Consulting team.

I will help our Clients – whether they are domestic or foreign companies – manage any issues that may arise in the course of tax audits or tax related representation. I participate in solving disagreements between tax-payers and the tax authorities as well as professional differences of opinion in the interpretation of the law in any field related to tax law. I am able to assist our clients in both Hungarian and English.

Dr. Máté Varga

Tax Manager

After completing Law University, I worked at the Hungarian Tax Authority from 2005-2011, where I participated in audits of tax-payers and represented the tax authority in taking decisions of appeal and administrative court cases. From 2011 I worked at the Ministry of Finance as a lawyer, deputy head and finally head of department. Among my duties was the preparation and coordination of procedural changes in the law, preparation of provisory tax statement decisions, and preparation of documents relating to the appeals process against NAV decisions. In 2014, I finished my career at NAV with a ministerial award. During my time at the ministry, I was regularly published in professional publications.

The final part of my career before I joined K-X Consulting was spent between 2014-2019 as a legal advisor at the Hungarian National Bank Chamber. As a legal advisor and a legal specialist in environmental protection as well as banking and the stock market, I am capable of responding to my clients’ questions in both English and Hungarian.

Krisztin Antal

Senior Tax Advisor

I graduated in law from the Faculty of Law at ELTE. Since 2021, I have been working in the field of tax law and tax consultancy; firstly at Havasi Law Firm and currently in the team at K-X Consulting. I am primarily involved in solving local business tax, VAT and corporate tax issues, and I often provide assistance in tax and invoicing due diligence.

I am available to assist our clients in Hungarian and English.

Dr. TündePapp

Tax Manager

I have extensive experience as a tax professional and manager. I have recently worked with an accounting firm providing comprehensive tax advisory services to a diverse client base ranging from individuals to large corporations. Tax issues for individuals are a recurring theme in my career, with a particular focus on matters with an international element, as with the spread of digitalisation the mobility of employees is also increasing, which now affects almost all businesses regardless of their size. My expertise extends beyond personal income taxation to social security and VAT, including international tax matters, as well as the specific tax base and tax benefits available under corporate income tax. As a tax manager at Grant Thornton Hungary, I handled personal income tax issues, negotiated contracts and managed teamwork. I also have experience in finding tax optimisation opportunities in the field of royalties and R&D, in which I gained experience at Ayming Hungary Kft. I also spent a significant period of time at KPMG, where I dealt with international tax and social security issues of individuals, and related tax planning options and practical issues.

I joined the K-X Consulting team in January 2024. I have a BAR exam, a chartered accountant qualification and I am a registered tax advisor. I support our clients in Hungarian and English in answering their tax questions and finding tailor-made tax solutions.

Tünde Kalmár

Accounting Manager

I graduated as an economist majoring in finance at the Budapest Business School, I have the qualifications of chartered accountant, tax consultant and IFRS accountant. I started my career in 2008 as audit assistant, where I established my expertise. Following that, I was an accounting group leader at an international company group; my main tasks were bookkeeping according to Hungarian and IFRS rules and the implementation of SAP. Between 2020-2023 I was the professional manager of an accounting office called e-Officium Kft.

At the end of 2023 I joined the team of K-X Consulting Kft, where I am available to our clients in Hungarian, English and German languages for tax due diligence tasks and bookkeeping/accounting issues.

Krisztina Koltai

Tax manager

Having graduated in Economics from Corvinus University of Budapest in 2015, I began my professional career at Mazars Ltd., where I spent ten years. During this time, I obtained my tax advisor qualification and gained extensive experience in VAT and personal income tax compliance. As a tax manager, I participated in numerous complex tax advisory projects involving multiple tax types. I also had the opportunity to coordinate several tax due diligence projects, contribute to cross-border advisory engagements, and support clients during tax audits. In addition, I have attended international tax conferences both as a participant and as a speaker.

I joined the K-X Consulting team in 2025, providing advisory support to our clients in both Hungarian and English.

Ágnes Pásztor-Tamás

Tax Advisor

Having graduated in economics from the University of Pécs in 2005 I started working as a tax consultant at Mazars Ltd., where I was familiarised with all fields of tax. Following this, I spent one and a half years in the Department of Excise Taxes at the Ministry for National Economy, before joining K-X Consulting Kft in 2002.

Currently, I primarily deal with personal income tax and VAT issues. I am able to assist our clients with solutions in Hungarian, English and French.

Dr. Szilvia Szakál

Senior Tax Advisor

I am a law graduate and certified tax advisor with nearly 10 years of experience in the field of indirect taxation. I spent the first 7 years of my professional career at a BIG Four firm, where I gained extensive experience in VAT advisory, compliance processes, tax due diligence, and supporting tax authority audits. In 2023, I had the opportunity to gain international experience: I worked as a senior VAT advisor at a tax advisory firm located in Singapore, where I further deepened my knowledge in the field of taxation. Since 2024, I have been a member of the team at K-X Consulting, where I carry out my work in both Hungarian and English.

Viktória Hubai

Senior Tax Advisor

During my Finance and Accounting studies at Corvinus University of Budapest I completed my internship at Deloitte in 2019 as a tax intern. After the internship, I joined the corporate tax and international tax team as a tax consultant. I continued my career at KPMG. My main responsibilities and tasks were preparation and review of corporate income tax and local income tax returns and calculations, participation in tax due diligences and analyzation of international structures from tax perspective. At Grant Thornton Hungary, I gained experience in working with all types of taxes. In 2024, I joined the K-X Consulting team. I primarily participate in tax advisory, and tax due diligence projects related to corporate tax and local business tax, in both Hungarian and English.

Dr. Tamara Nemes

Tax Advisor

After obtaining my degree in Law, I began my career as a trainee lawyer and worked in law firms. My tax-related career started at BDO in 2021 and I joined K-X Consulting in 2023 since when I have primarily been involved in VAT, extended producer responsibility, and environmental product fee-related tasks, as well as in due diligence projects. In addition, I have participated in writing newsletters and articles. I am at the Client’s disposal in Hungarian and English.

Éva Futakfalvi-Hart

Tax Advisor

I graduated from the Budapest School of Economics as an economist and have qualifications as an accountant and tax advisor. Building on my previous experience as an accountant, I joined the dynamic team of K-X Consulting in September 2024, where I mainly provide support in VAT and personal income tax (PIT) matters. I am ready to assist our clients in both Hungarian and English.

Judit Kajtár

Auditor, Accounting Expert

I started my professional career at Mazars Ltd in 2000 where I was primarily engaged in the audit of Hungarian financial statements and IFRS consolidation packages. In addition, I also participated in due diligence assignments and was responsible for the organisation and execution of various trainings. As a manager, I specialized in the audit of banks and insurance companies. In 2009 I decided to pursue a new challenge and became the finance and accounting director of the Hungarian subsidiaries of the French-Belgian Group in the energy sector (ENGIE, ex GDF SUEZ), where I spent nine years.

Since 2018 I have been working on audits as a registered auditor, and alongside that I am delighted to support the Team of K-X Consulting in due diligence and accountancy consultancy tasks.

András Attila Barsi 

LegalTech Expert

I have an MBA from American, Hungarian and French universities and spent 10 years at an electronic signature authentication provider in commercial, strategic and management positions. My career has seen me assisting a number of businesses in developing strategic products with electronic signatures and remote identification expertise. In 2011, my name was associated with the “IT Project of the Year” award awarded by the IVSZ (Association of IT Companies) for digitisation of the System of Hungarian Bailiff Requests. I am currently a consultant and project manager in a number of Hungarian and international projects. I work numerous with senior managers on strategic digitisation projects where credibility and the legal impact are vital factors. I am also more than willing to offer training or lectures on the subject. I have been working together with K-X Consulting since 2019.

Szilvia Várkonyi

Office Manager

I completed my studies at the College of Commerce, Hospitality and Tourism in the field of Tourism and Hospitality, graduating as an economist. Following that, I took a job at a Conference centre as an event organizer, before moving into the hotel industry as a sales manager, later as a reservations manager. Leaving tourism, I worked for an SAP consulting IT company as an office manager. In addition to administrative tasks, I arranged business trips, corporate events, fire and safety training, and I was the company’s ISO quality management manager.

I joined K-X Consulting Kft in August 2021, where I support the team as an office manager. My main responsibilities are tracking proposals and managing contracts; invoicing; and liaising with the bookkeepers and clients (in English and sometimes German).

Viktória Leinemann

Office Assistant

Currently, I am pursuing my economics studies in commerce and marketing as a correspondence student at Óbuda University. At my previous workplace, I help a position as an administrator, where my responsibilities included maintaining contact with partners and suppliers. In May 2025, I joined the K-X team, where as an office assistant, I actively contribute to the smooth daily operation of the office and support my colleagues’ work through my activities.