Pillar 3a — The Tax Deduction Most People Underuse

The shortcut: "I have a 3a, so that box is ticked." Having a 3a and using a 3a are different things. The deduction has a hard annual limit, an unforgiving deadline, and a default configuration that quietly costs six figures over a working life.

The fact pattern

Employed and in a pension fund: you may pay up to CHF 7,258 per year (2026) into Pillar 3a and deduct the full amount from taxable income. Self-employed without Pillar 2: up to 20% of net earned income, capped at CHF 36,288.

At a marginal tax rate of 30% — common for higher-income professionals in many cantons — a full contribution returns roughly CHF 2,200 in immediate tax savings. Every year. Withdrawals are taxed later, but separately from income and at a reduced rate: for most households the arithmetic is decisively positive.

Three ways the deduction gets underused:

1. Too late. The contribution must be credited to the account by the end of December. Every January, people discover their late-December transfer missed the year. The banks' cut-off dates are earlier than yours.
2. Too little. Partial contributions are fine — but unlike some countries' systems, unused allowance is gone forever. (A legal change allows limited retroactive buy-ins for gaps from 2025 onward, under conditions — but relying on repair is a strategy of last resort.)
3. The wrong vehicle. A 3a cash account preserves the tax deduction and forfeits the growth. Over 25 years, CHF 7,000/year at ~0.5% interest versus a globally diversified 3a investment solution at historical equity returns is a difference in the low six figures. The deduction is the headline; the compounding is the story.

Both partners, both allowances

Each employed partner has their own limit. A dual-income household ticking one 3a while the second allowance expires unused is leaving roughly CHF 2,000/year of tax savings behind — the most common version of "we have a 3a" we see.

Multiple accounts — the exit plan

3a capital is withdrawn per account, in full, and taxed at a progressive rate on the lump sum. Splitting savings across several 3a accounts lets you stagger withdrawals across tax years and cantonal rules later. That decision only exists if you make it early — consolidated capital can't be split retroactively.

What are you optimising for?

3a serves several goals — retirement gap, property purchase (funds can be withdrawn or pledged for a primary residence), or the indirect-amortisation strategy for existing owners. Which goal it serves changes how it should be invested: money earmarked for a purchase in three years does not belong in equities; money locked until 65 usually doesn't belong in cash.

Control questions: Did each earner in the household contribute the full allowance last year? Is the money invested or idling in cash — and does that match when you'll need it? Is this year's contribution scheduled before December?