Why Switzerland’s wealth-inequality picture may be less clear than it appears

Housing values provide the most important correction to the trend in measured inequality. Swiss tax authorities use fiscal property values, and those assessments can remain below market prices for long periods before being updated.

As Swiss house prices rose, the gap between tax values and market values widened. A homeowner’s economic wealth could increase substantially while the value recorded in tax statistics barely moved. That distortion is especially important for middle-wealth households, which hold a larger share of their assets in homes than the very richest households.

The wealthiest households often hold financial portfolios, private companies and other assets that are more fully reflected in tax records. When middle-class housing is under-recorded, the data mechanically assign a larger share of total measured wealth to the top. The resulting increase in inequality can therefore reflect valuation rules rather than a change in who owns Switzerland’s wealth.

The CES ifo paper revalues property at market prices. Once that adjustment is combined with a fuller account of pension assets, the earlier upward trend largely disappears. The finding does not suggest that every canton or household experienced the same housing gains. It shows that national inequality estimates can shift sharply when a major asset class is valued consistently.

For Switzerland, the issue reaches beyond statistics. Property valuation affects wealth-tax bills, political claims about concentration and the perceived fairness of taxing homeowners who may be asset-rich but cash-poor.

The study builds a national picture from detailed data gathered in Bern, then applies statistical reweighting. Switzerland’s federal structure gives researchers rich local information, but it also leaves them working with a fragmented data system.

The underlying observations come from Bern. The researchers reweight those records to reproduce national distributions of taxable income, taxable wealth, age and sex. They then combine the adjusted tax information with pension statistics and market-based property values to construct Distributional National Accounts for 2003 to 2022.

This method improves on a simple reading of federal tax tables, but it cannot remove every uncertainty. The national estimates depend on the assumption that reweighted Bern data capture the country’s joint distribution of income and wealth. The authors acknowledge that this assumption cannot be tested directly with the available information.

That limitation matters when interpreting regional differences. Swiss housing markets, employment patterns and pension profiles vary between urban centres, smaller towns and rural areas. The paper’s result describes the national trend; it does not mean that wealth concentration moved identically in Bern, Zurich, Geneva, Ticino or the mountain cantons.

The broader lesson concerns statistical infrastructure. A country can collect detailed tax information and still miss economically important assets. Better measurement requires linked data on property, pensions, financial holdings and household characteristics, alongside clear disclosure of the assumptions used to combine them.

Switzerland remains highly unequal even if the recent rise in measured concentration fades. The CES ifo estimates place the average wealth of the top 1% at around 500 times the average wealth of the bottom half. The country sits above France on wealth concentration, though below the United States.

The research also records substantial growth in wealth. Real wealth increased by about 3.75% per year from 2003 to 2022, while the private wealth-to-income ratio climbed from 5.6 to 8.5. Wealth therefore became more important relative to income, even as its distribution did not show a clear upward trend after the researchers corrected the data.

Those findings complicate arguments on both sides of Switzerland’s tax debate. Advocates of stronger redistribution can still point to a large gap between the richest households and the bottom half. Opponents of new taxes can cite the absence of a pronounced increase in concentration, but the result does not make existing disparities disappear.

The policy choices will turn partly on measurement. Wealth taxes, inheritance taxes, housing policy and pension reform produce different effects depending on which assets are counted and how they are valued. Tax records remain essential, but they should not be treated as a complete balance sheet for Swiss households.

Future estimates will need more comprehensive asset data and transparent testing of national assumptions. Until then, claims about widening inequality should specify whether they describe taxable wealth or economic wealth.