Selling at record prices: how the property gains tax works

How the taxable gain is determined

The basic formula is simple: what is taxed is the difference between the sale proceeds and the so-called investment costs. Investment costs include the original purchase price, value-enhancing investments – an extension, the first installation of a heat pump or an attic conversion, for example – plus costs connected with the sale such as estate agent fees or listing costs. Value-preserving maintenance, by contrast, is not counted, as it could already be deducted from income tax on an ongoing basis. Distinguishing between value-enhancing and value-preserving work is demanding in individual cases and one of the most frequent points of dispute in the assessment procedure.

Holding period: discounts and surcharges

Almost all cantons reward long ownership and penalise quick resales. Anyone who has owned a property for only a few years often pays a speculation surcharge on top of the ordinary tax. Conversely, the tax falls as the holding period increases – depending on the canton, by up to 50 percent or more after 20 to 25 years. The specific tariffs, reductions and thresholds vary considerably from canton to canton; sometimes a few months make a noticeable financial difference. Before a planned sale it is therefore worth checking your canton’s holding-period thresholds: sometimes waiting is worth real money.

Tax deferral through replacement purchase

Anyone who sells their permanently and exclusively owner-occupied home and reinvests the proceeds within a reasonable period – in practice usually around two years – in an owner-occupied replacement property in Switzerland can defer taxation of the gain. Important: the deferral is not an exemption. The latent tax travels with you and falls due when the replacement property is eventually sold without a further replacement purchase. The tax is also deferred in cases of inheritance, advance inheritance and gifts, as well as transfers between spouses in connection with matrimonial property law – here too, the recipient takes over the latent tax burden.

Often overlooked in practice: a partial replacement purchase is also possible. If only part of the proceeds is reinvested, the tax can be deferred proportionately, depending on the amount reinvested; the details are regulated differently by the cantons. Timing the purchase of the replacement property cleverly relative to the sale also avoids expensive bridge financing – the sequence of transactions should therefore be clarified early with your bank and the tax authority.

Receipts: the underestimated savings potential

Every value-enhancing investment you cannot document effectively increases your taxable gain. The invoice for the conservatory from 2009, the statement for the conversion in 1998 – such documents are worth their weight in gold when you sell. We recommend that owners keep a property dossier: all invoices for conversions and extensions, building specifications, plans and transfer documents in one place, ideally digitised. This pays off twice – not only for the property gains tax, but also with a view to the 2029 reform of home-ownership taxation, which reorganises the tax treatment of maintenance and investments.

Planning the sale means planning the taxes

Timing the holding period, compiling the investment costs cleanly, considering a replacement purchase: with the property gains tax, preparation determines the net proceeds. Because tariffs and practice vary greatly between cantons, blanket recipes are out of the question – what works in one canton may fall flat in another. An individual calculation before the decision to sell creates clarity and prevents the tax bill from spoiling the pleasure of the price achieved. As your real estate and fiduciary partner, we support you from the valuation and marketing through to the tax return after the sale.