Taxation and pension provision in Switzerland: what remains, what is changing, and why planning has never been so crucial

For years, the range of tax-deductible tools available to Swiss taxpayers was relatively generous. Deductible mortgage interest, buy-ins into the second pillar, contributions to pillar 3a, and staggered withdrawal of pension capital: these were well-established mechanisms handled with precision by tax specialists and wealth advisers. But this range is shrinking, and the tightening is accelerating.

With the gradual disappearance of certain tax advantages and the increasing complexity of the rules, planning one’s pension and tax situation has never been more essential to protect wealth and optimise savings. Here is an overview of the options available.

Real estate taxation: a lever that is now (strongly) limited

The deductibility of passive interest, particularly mortgage interest, as well as maintenance costs, has long represented a significant tax advantage for Swiss property owners. By deducting these expenses from taxable income and from the rental value, they could substantially reduce their tax burden, especially at higher marginal tax rates.

Following the recent vote on the reform of property taxation, the abolition of mortgage interest deductibility is now confirmed. The logic is straightforward: by ending the taxation of this imputed income, the reform also removes its counterpart. For households that structured their planning around this lever, the impact is tangible, and adaptation is now required.

Pillar 3a: a must, but early withdrawals are less advantageous than expected

Pillar 3a remains one of the few retirement savings instruments offering an immediate tax deduction. Every franc contributed reduces taxable income up to the legal annual ceiling. Nothing has changed in this respect.

However, discussions around the possibility of making retroactive contributions into pillar 3a have seen several reversals. The original proposal was generous: it allowed the buy-back of up to ten years of missed contributions, within the maximum contribution limit applicable to self-employed individuals without a pension fund. This would have been a significant opportunity for taxpayers who had neglected or delayed funding their third pillar. The version finally adopted is much more restrictive: only years from 2025 onwards are eligible for retroactive buy-ins, significantly reducing the scope for those hoping to compensate for long-standing gaps in the past.

What remains: buy-backs in the second pillar

In this context of gradually shrinking tools, buy-ins into the pension fund remain one of the most attractive levers for employees and self-employed individuals. The principle is simple: if your pension assets are lower than what you would theoretically be entitled to based on your salary trajectory, you can fill this gap through voluntary contributions, which are fully tax-deductible. For taxpayers subject to high marginal tax rates, the tax savings can be substantial.

A recent positive development is worth highlighting: both the Council of States and the National Council have rejected the proposed increase in taxation on lump-sum withdrawals from the second and third pillars. Such a measure would have significantly reduced the attractiveness of the entire pension system, both for LPP buy-ins and for private pension savings via pillar 3a

The Bürgin motion: a reform targeting high incomes

Adopted by the National Council last March, this motion aims to halve the maximum insurable salary, from CHF 907,200 to CHF 453,600 in 2025. The argument is that the current ceiling allows tax-deductible buy-ins reaching millions, thereby diverting the system from its original pension purpose towards pure tax optimisation for very high incomes.

For the vast majority of employees and self-employed individuals, this new ceiling would remain more than sufficient, corresponding to the salary level of a federal councillor. But for senior executives, business owners or commodity traders who have built their wealth strategy around substantial buy-ins, the window of opportunity would close significantly. The motion is supported by the Federal Council and has already been debated in parliament. To be continued.

Individual taxation: marital optimisation will become more complex

The shift towards individual taxation introduces an additional layer of complexity. Today, married couples are taxed jointly. Individual taxation is intended to address this, but it will also make planning within couples more complex. However, this remains uncertain, as the Centre party has proposed a federal popular initiative for fair federal taxation for married couples, which has been maintained. The Swiss will therefore vote again on this issue, which could still change the outcome. If each spouse is taxed separately, the question of who should make pension buy-ins, in which pension fund, and at what time becomes strategic. It is no longer enough to optimise the household’s overall deductions: trade-offs must be made between respective marginal tax rates, individual pension gaps, institutional rules, and differing retirement horizons. A high-earning spouse may benefit more from a large buy-in, but what if their pension fund conditions are less favourable than those of their partner? Which criterion should ultimately prevail?

Plan now, and plan properly

The conclusion is clear: as optimisation tools diminish and rules become more complex, personalised planning takes on its full importance.

A few recommendations to get started:

-          Contribute regularly to your pillar 3a whenever possible;

-          Make use of pension buy-ins while current rules still allow it, while respecting standard constraints, notably the three-year blocking period between a buy-in and a lump-sum withdrawal;

-          Stagger withdrawals of pension capital over several tax years;

-          For couples, before the introduction of individual taxation reform, analyse which individual situation justifies prioritising a buy-in, and in which institution.

Pension provision and taxation have never been static topics in Switzerland. But the pace of legal change today is unusually fast. In this context, postponing reflection means risking leaving valuable opportunities on the table that may be difficult to recover.