The annual closing period is approaching, and with it the most critical phase of the CIT (corporate income tax) calculation. Although the corporate income tax return deadline for calendar-year taxpayers in 2026 is 1 June 2026, accounting close, tax calculation, and statutory audit processes already begin in February–March for many businesses. At this time, questions that tend to arise “only once a year” come into focus, and any errors in these areas may lead to tax risks, inquiries from the Hungarian tax authority (NAV), subsequent corrections, and significant administrative burdens. Below, we have selected some typical pitfalls related to the CIT calculation and related taxes (e.g. local business tax and innovation contribution), including several special cases that, based on our experience, often pose challenges.
The relationship between IFRS accounting and CIT (corporate income tax)
Although the use of IFRS (International Financial Reporting Standards) is mandatory only in certain industries (e.g. credit institutions), an increasing number of Hungarian companies are choosing to apply them. At the same time, it should not be forgotten that despite preparing IFRS financial statements, tax liabilities must still be determined under the Hungarian Corporate Income Tax Act. This “duality” may involve a number of potential sources of error, so the involvement of an expert is strongly recommended in order to avoid them.
- Deferred tax calculation: one such area requiring particular attention and expertise is the preparation of the deferred tax calculation. While under Hungarian accounting rules the recognition of deferred tax assets and liabilities is optional, under IFRS it is mandatory. Although there are typical temporary differences between accounting and tax rules, there are also numerous special adjustment items whose identification requires years of professional experience in this field.
- Tax effects of IFRS transition: the proper treatment of transition differences related to the adoption of IFRS may also present challenges, and numerous special tax base adjustments may arise in connection with these items in the years following the transition.
Development reserve: CIT savings and its links to local business tax (LBT / HIPA)
The creation of a development reserve is a popular tax-saving tool offering cash-flow benefits, but strict legal and accounting requirements must be met for its application.
- Precondition from a CIT perspective: in order to apply the tax base reduction item, the tied-up reserve must already be available in the year-end financial statements. This requires a decision by the company’s highest decision-making body (members’ meeting or general meeting), as well as the transfer of the amount from retained earnings to tied-up reserve. Both the statutory auditor and the tax authority examine the existence of these conditions when reviewing the lawful use of the tax benefits related to the development reserve.
- HIPA allocation: a critical point is the allocation of the local business tax base in the case of assets financed from the development reserve and for which no tax depreciation may be recognized for CIT purposes. In the case of such assets, special attention is required for the correct asset-based allocation calculation. In addition to creating tax risk, an incorrect calculation and improper allocation may lead to considerable administrative burden and additional costs in subsequent corrections, in proportion to the number of affected municipalities.
Foreign branches: avoiding double taxation
The tax obligations of Hungarian branches of foreign companies are a frequently discussed topic; however, less attention is paid to the tax issues of Hungarian companies that operate foreign branches. It is important to know that such businesses must review not only Hungarian regulations, but also the relevant double taxation treaties.
A key issue to be addressed in this context is the proportional allocation of indirect costs, expenses, and tax base adjustments between the head office and the foreign branch, as well as the rules for crediting tax paid abroad in Hungary. These are generally less widely known, highly specialized tasks that require specific expertise and deserve particular attention, as they involve a number of possible errors.
Local business tax (HIPA) and the permanent establishment dilemma
In connection with local business tax (HIPA), we would like to draw attention to two areas:
- Intermediated services: the deductibility conditions for subcontracted services and intermediated services are among the more frequently discussed topics, yet they still deserve mention. On the one hand, municipal tax authorities pay special attention to these items in tax audits; on the other hand, we regularly encounter misinterpretations and misunderstandings regarding what exactly should be included in the invoice and in the contract. The deduction of improperly documented intermediated services or subcontracted services results in a tax shortfall. In other cases, businesses lose the opportunity to reduce their tax base because they fail to create the necessary supporting documentation, or because, due to uncertainties of interpretation, they do not make use of the tax base reduction option.
- Registration obligation: where a business has multiple locations, it is important to examine actual economic presence. Based on our experience, it regularly occurs that a company registers for local business tax in a municipality where it has no actual permanent establishment (for example, it merely uses logistics services provided by an external partner, but registers the logistics provider’s warehouse as its own permanent establishment). In such cases, however, the given municipality will expect the filing of a tax return and the payment of tax revenue, and in the absence of these it will initiate an audit. If, following the erroneous registration, tax payment was also made, subsequent correction — especially where this affects multiple municipalities and requires the correction of tax base allocation — can create significant administrative burden and additional costs for the business.
Innovation contribution: NAV audit focus and frequent omissions
For large companies, the innovation contribution is not merely a tax payment obligation. Many overlook that although the innovation contribution return is filed through the corporate income tax return form, businesses that become subject to this obligation for the first time also have registration and first-time advance tax return filing obligations. Based on our experience, the tax authority reviews these obligations retrospectively as well and imposes penalties if the business has failed to comply with them.
It is also important to note that from 2022, innovation contribution liability has also extended to Hungarian branches of foreign companies. Ignoring this may result in the accumulation of a significant tax shortfall.
