Why is it das Ehegattensplitting?

Ehegattensplitting is a compound noun, and German compounds take the article of their last word: das Splitting. So it’s das Ehegattensplitting.

Sense 1
das

Meaning

[1] In the Federal Republic, possible form of even distribution of family income to both spouses to reduce income tax

[1] In der Bundesrepublik mögliche Form der gleichmäßigen Verteilung des Familieneinkommens auf beide Ehegatten zur Reduzierung der Einkommenssteuer

Examples

[1]

[1]

Declension

1 Singular Plural
Nominativ das Ehegattensplitting —
Genitiv des Ehegattensplittings —
Dativ dem Ehegattensplitting —
Akkusativ das Ehegattensplitting —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary