Calculating Capital Gains Tax on Real Estate: Here’s How

Are you looking to sell your apartment or house and wondering how much the capital gains tax will be? If so, you’re not alone. Capital gains tax is one of the most significant cost factors in Real Estate sales and is often underestimated by many owners.

The good news: Not all of the profit from the Sales is subject to tax. Various value-enhancing investments and transaction costs can be deducted from taxable income. However, it is essential that these expenses can be substantiated with supporting documentation.

What is property gains tax?

Real estate gains tax is levied when a property is sold at a profit. It taxes the difference between the original purchase price and the subsequent sales proceeds.

The tax burden can vary depending on the canton and how long the property is held. In many cantons, those who own their property for many years benefit from lower taxes than owners who engage in Sales after only a short time.

How is the property gains tax calculated?

The calculation is generally performed according to the following formula:

Selling Price

• original purchase price
• Value-enhancing investments during the holding period
• Eligible incidental sales expenses and brokerage fees

= taxable capital gain on real property

Property gains tax is then calculated based on this taxable profit.

A simple math example

Let’s say you bought your condominium in 2012 for CHF 850,000. In 2026, you sell the condo for CHF 1,350,000.

During the period you owned the property, you made the following investments:

• New kitchen: CHF 80,000, of which 50% (CHF 40,000) is counted as an increase in value
• Sunroom: CHF 50,000 (100% increase in value; there was no sunroom before)

In addition, there is a real estate agent’s fee of CHF 35,000 for Sales.

The calculation is as follows:

Selling price: CHF 1,350,000

minus purchase price: CHF 850,000

minus value-enhancing investments: CHF 90,000

minus incidental sales expenses: CHF 35,000

= taxable capital gain on real estate: CHF 375,000

The effective tax rate is then calculated based on cantonal regulations and the holding period.

What expenses are generally tax-deductible?

Many homeowners are needlessly throwing money away here.

Some of the most common tax-deductible investments include:

• Additions and Expansions
• Conservatories
• Attic Conversions
• New kitchens or bathrooms that significantly increase property value
• Energy-Efficient Renovations
• Facade or insulation measures
• Solar Power Systems

Various incidental sales costs can also be taken into account. These include, for example, real estate agent commissions, advertising costs, or certain fees related to the sale.

Why Missing Receipts Can Be Costly

In practice, the biggest challenge often lies not in the calculation itself, but in the documentation.

Many homeowners don’t sell their property until ten, twenty, or even thirty years have passed. During that time, they’ve made numerous investments—a new kitchen here, a sunroom there, and perhaps a major Renovation later on.

However, it is not uncommon for the relevant invoices and documents to have been lost over the years. Investments that cannot be substantiated are often not recognized—or only partially recognized—by the tax authorities. This increases taxable income and, consequently, property gains tax.

Anyone planning for Sales should therefore gather all available documents as early as possible. These include invoices, construction statements, quotes from contractors, building permits, and other documents that provide evidence of value-adding investments.

It pays to plan ahead

Property gains tax cannot be avoided. However, it can be calculated correctly and optimized through comprehensive documentation.

The sooner owners review their documents and prepare for the Sales, the easier it is to estimate the financial implications. At the same time, this provides clarity on what net proceeds can actually be expected after the Sales.

Are you planning to sell a property?

Calculating and filing property gains tax requires experience and a careful review of all relevant documents. That’s why a specialized team of experts at Ginesta Immobilien is here to assist you.

We’ll help you gather the necessary documents, review value-enhancing investments, and, if you wish, handle the preparation and filing of your real estate gains tax return. This way, you’ll have a clear picture early on of your estimated tax liability and expected net proceeds.

Would you like to know what selling price your property could fetch today and what factors influence your capital gains tax? Contact us for a no-obligation consultation.

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