Swiss Voters Face Uncalculated Costs in Marriage Tax Initiative

On November 29, Swiss voters will decide on the popular initiative "Yes to fair federal taxes for married couples," submitted by The Centre party to retain joint taxation for married partners at the federal level. Federal authorities estimate that the proposal could cause annual tax revenue shortfalls ranging between 680 million and 3 billion Swiss francs, depending on how the final tax structure is designed.

During parliamentary deliberations on the initiative, lawmakers evaluated 13 distinct tax models. Only one model matched the cost profile of the individual taxation system approved by parliament, while the remaining twelve options created higher losses for the government and imposed additional tax burdens on middle-income households. Because Swiss cantons receive 21.2 percent of direct federal tax revenue, decreases in federal receipts will directly affect cantonal revenue.

Efforts to eliminate the tax penalty for married couples date back to a Federal Supreme Court ruling in 1984. A 2016 initiative by the party failed narrowly at the ballot box, but the Federal Supreme Court annulled the result in 2018 due to incorrect official information distributed prior to the vote. Parliament subsequently mandated the Federal Council in 2020 to draft an individual taxation law, which was accepted in a spring 2026 referendum after ten cantons, The Centre, and the Swiss People's Party challenged the original statute.

Cantonal governments remain divided over the proposed constitutional amendment. Thurgau Finance Director Urs Martin of the Swiss People's Party supports the initiative, stating that it would spare cantons from a complex operational transition to individual taxation. In contrast, Basel-Stadt Finance Director Tanja Soland of the Social Democratic Party warned that running joint taxation at the federal level alongside individual taxation at cantonal and municipal levels would cause severe administrative disruption.

While formal legislation and preparation for individual taxation are already established, the exact details of The Centre's initiative remain open. Key variables, including specific tax tariffs, deduction limits, and offset mechanisms for unmarried taxpayers, will only be determined by parliament if voters approve the initiative on November 29.

Written by Thomas Nussbaumer thomas.nussbaumer@alpineweekly.com