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Federal Tax Court judgement: First ruling on the deduction ban under section 4i of the Income Tax Act

BFH-Insights

Interest deduction in German income tax law is surrounded by numerous prohibitions and restrictions. Once the business-related nature of the expense has been established (section 4(4) of the Income Tax Act [Einkommensteuergesetz–EStG]), the interest limitation rule (section 4h Income Tax Act, section 8a Corporate Income Tax Act [Körperschaftsteuergesetz–KStG]) and the trade tax add-back under section 8 no. 1 of the Trade Tax Act [Gewerbesteuergesetz–GewStG], among other things, must be observed. There are further restrictions from section 4(4a) of the Income Tax Act for “special situations”. In a cross-border context, the Federal Fiscal Court [Bundesfinanzhof–BFH] has now ruled for the first time on the “anti-double-dip” rule contained in section 4i of the Income Tax Act (file ref. IV R 36/23).

Dr Martin Weiss
| 9 min read | 03 Sep 2026

Federal Tax Court judgement: Treatment under treaty law of trade tax for partnerships

BFH-Insights

For income tax purposes, partnerships are treated as transparent as far as income tax and corporate income tax are concerned. By contrast, they only incur trade tax if there is a trade or business as defined by Income Tax Act [Einkommensteuergesetz–EStG] (section 2(1) sentence 2 of the Trade Tax Act [Gewerbesteuergesetz–GewStG]), but then in its entirety (section 15(3) no. 1 Income Tax Act). This tax is then also owed by the partnership itself (section 5(1) sentence 3 Trade Tax Act). In a cross-border context, double taxation treaties (DTTs) must frequently be included in the considerations, and concerning all types of income tax as well. In the context of the Germany-Switzerland DTT the Federal Fiscal Court [Bundesfinanzhof–BFH] has handed down another decision in the area of shipping (file ref. IV R 32/23).

Dr Martin Weiss
| 6 min read | 03 Sep 2026

Federal Tax Court judgement: Taxation of the takeover profit on upstream mergers doubtful under EU law

BFH-Insights

“Transfer profit” [Übernahmegewinn] is one of the four types of profit concerning which reorganisation tax law provides rules on how they come about and on their income tax treatment. In the case of reorganisations into a partnership, the keyword “elimination of acquisition costs” (section 4(6) sentence 6 of the Reorganisation Tax Act [Umwandlungssteuergesetz–UmwStG]; section 18(2) sentence 1) is frequently discussed under section 4(4) and following of that Act (most recently Federal Fiscal Court [Bundesfinanzhof–BFH] judgement of 28 May 2026, file ref. IV R 3/23). Increasingly, however, doubts are also being raised about the income tax treatment of the takeover profit that arises when corporations are reorganised into other corporations (section 12(2); section 19(1)). The tenth chamber of the Federal Fiscal Court has now expressed doubts with regard to the EU Merger Directive (2009/133/EC; section 1(5) no. 1 of the Reorganisation Tax Act) in an order for reference to the European Court of Justice (Art. 267(3) TFEU; file ref. X R 27/22).

Dr Martin Weiss
| 9 min read | 02 Sep 2026

Annual Tax Act 2026: The planned changes to the Income Tax Act

Annual Tax Act 2026 – changes in income tax law

On 12 August 2026, the Federal Cabinet adopted the draft of an Annual Tax Act 2026 [Jahressteuergesetz 2026–JStG 2026]. The legislative procedure is intended to be concluded before the end of the year. What is being implemented is legislative need dictated by technical considerations, in particular adaptations to European Union law and responses to the case law of the Federal Fiscal Court [Bundesfinanzhof–BFH]. One focus lies in income tax law: Of particular practical relevance are the first statutory rules on the allocation of the purchase price for developed properties (section 6f of the draft Income Tax Act [Einkommensteuergesetz–EStG]), the halving of the relevant period for the first place of work [erste Tätigkeitsstätte] and the increase in the exemption threshold for waiving the deduction of tax at source in section 50c of the Income Tax Act. In addition, the ministerial draft [Referentenentwurf] of an “Income Tax Reform Act 2027” [Einkommensteuerreformgesetz 2027–EStRefG 2027] gives rise to a possible change to the income tax rate schedule (section 32a of the Income Tax Act).

Dr Martin Weiss
| 14 min read | 01 Sep 2026

Münster Fiscal Court expresses doubts on constitutionality of interest on suspended tax liabilities for the years 2014 to 2018

Tax law | Interest on suspended tax liabilities

Interest charged on suspended tax liabilities (suspension interest) of 0.5% per month, i.e. 6% per year, might (already) be unconstitutional for interest accrual periods from 2014 to 2018. Münster Fiscal Court reached this conclusion in its decision dated 3 June 2026 (9 V 583/26), thereby granting a stay of enforcement in respect of the interest assessment notices in question. For the period from 2019 to April 2021, the Federal Fiscal Court (BFH) had already expressed serious doubts about the constitutionality of suspension interest in another case (decision of 24 October 2024, VI B 35/24).

Dr Gerrit Bartsch
| 7 min read | 01 Sep 2026
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Press releases

Grant Thornton increases annual revenue to EUR 264 million in financial year 2024/25

11 Mar 2026

The audit and advisory firm Grant Thornton in Germany ended the 2024/25 financial year on September 30, 2025, with consolidated revenue of EUR 264 million (up 6 percent on the previous year). The Audit & Assurance division recorded particularly strong growth with an increase of 14 per cent compared to the previous year.

Grant Thornton Germany wins Martin Biegel for the new position of CFO/COO

09 Feb 2026

Martin Biegel joined the Senior Leadership Team of the audit and advisory firm Grant Thornton Germany in February as the new Chief Financial Officer/Chief Operating Officer (CFO/COO) and in this role will actively help drive the firm’s strategic development.

Grant Thornton Germany and Cinven enter into strategic partnership

13 Oct 2025

The Equity Partners of Grant Thornton AG Wirtschaftsprüfungsgesellschaft (“Grant Thornton Germany”) have approved the strategic partnership with international private equity firm Cinven. This marks a key milestone for the transaction initially announced on 10 September 2025, which is expected to close in the first quarter of 2026. The partnership further strengthens Grant Thornton Germany’s position as a leading, trusted service provider in the German audit and advisory market, ushering in its next phase of growth.

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