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Wage taxation under the double tax treaties (DTT)

BFH-Insights

The treatment of wages under German double tax treaties essentially follows the regulations of Art. 15 of the OECD Model Convention 2025. Only the state of residence is entitled to tax such income, “unless the employment is performed in the other contracting state.” The regulations in paragraph 2 of Art. 15 then establish exceptions to the source state’s competing right to tax. In this context, the Federal Tax Court has now once again had to rule on a treaty override (Sect. 50d(9) of the Income Tax Act). In cases of substantive errors, however, it can (unfortunately) also “change course” beforehand.

Dr Martin Weiss

| 7 min read | 31 Mar 2026

Transitional issues in inheritance tax and constitutional law

BFH-Insights

The Inheritance and Gift Tax Act is currently the subject of controversy due to political debates as well as pending decisions by the Federal Constitutional Court. The decision preannounced on the Federal Constitutional Court’s website in case 1 BvR 804/22 specifically concerns the new inheritance tax law, which had been implemented following the Federal Constitutional Court’s 2014 decision (Federal Constitutional Court, judgment dated Dec. 17, 2014, file number 1 BvL 21/12). The Federal Tax Court has now ruled in favor of the tax authorities in a judgment addressing temporal application issues arising from the transition to the new law (judgment of Nov. 20, 2025, file number II R 7/23).

Dr Martin Weiss

| 7 min read | 30 Mar 2026

2026 Annual Preview: Tax Law in the Spotlight of the Federal Constitutional Court

Tax Law 2026 – Constitutional Developments

The Federal Constitutional Court publishes an annual list of “planned decisions for the year 2026.” Among the numerous cases are six decisions related to tax law. Particular focus is placed on the constitutional assessment of Sect. 8c of the Corporate Income Tax Act in the context of the acquisition of more than 50 percent of the shares in a corporation, as well as a landmark decision on the inheritance tax benefits under Sect. 13a and 13b of the Inheritance and Gift Tax Act.

Dr Martin Weiss

| 4 min read | 27 Mar 2026

Determination of the profit threshold for the investment deduction (“Investitionsabzugsbetrag”) (Sect. 7g of the Income Tax Act)

Tax

The question of how to determine “profit” is relevant in several areas of income tax law. In ad-dition to the assessment basis “profit” in Sect. 2(2) sent. 1 no. 1 of the Income Tax Act, such questions arise particularly in Sect. 4(4a) of the Income Tax Act, Sect. 34a of the Income Tax Act, but also with regard to the investment deduction (“Investitionsabzugsbetrag”) of Sect. 7g(1–4), 7 of the Income Tax Act. In this regard, the Federal Tax Court has now ruled that off-balance-sheet adjustments must also be taken into account when determining this “profit threshold”.

Dr Martin Weiss

| 9 min read | 20 Mar 2026

Supplementary taxes on income tax and their procedural peculiarities

BFH-Insights

The corporate income tax and income tax are both subject to the “solidarity surcharge”. In addition, church members face an additional income tax burden in the form of the church tax, which in turn reduces the income tax liability as a fully deductible special expense (“Sonderausgabe”; Sect. 10(1) no. 4 of the Income Tax Act). These taxes also present procedural challenges, as a new Federal Tax Court (“Bundesfinanzhof”) ruling (file number X R 28/22) demonstrates.

Dr Martin Weiss

| 5 min read | 13 Mar 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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