Pillar 3a 5-Account Strategy: How to Build Your 3a Right from Day One

By Thierry Borgeat, CFA & Co-Founder · Reviewed by Patrick Rissi, CFA and Florian Jauch, CFA · Updated May 2026 · 10 minute read

You're starting your Pillar 3a — or you've already been saving on a single account for years. In both cases, you are making the most important structural decision of your retirement planning right now: across how many accounts do you spread your contributions? Those who enter retirement with a single account quickly forfeit CHF 6'000 to CHF 20'000 in tax — money that can be saved with two clicks at the provider and a small routine. This article shows you how the 5-account strategy works, when you should build it up, what the rotation logic looks like — and what to do if you start late.

Why 5 accounts are better than 1

The answer lies in the tax system — more precisely: in the progressive taxation of lump-sum withdrawals. Anyone who withdraws their 3a assets in a single year lands in a higher progression bracket than someone who spreads the same amount over 5 years. Concretely: on CHF 500'000 in one year, you pay around CHF 37'500 in the city of Zürich. On 5 × CHF 100'000 over 5 years, only 5 × CHF 4'600 = CHF 23'000. A saving of CHF 14'500 — purely through temporal distribution.

But: you can only withdraw a Pillar 3a account as a whole — never partially. If your entire assets sit on a single account, they must come out in a single year. The number of your accounts thus equals the maximum number of years you can stagger over.

The savings are not linear — the biggest jump occurs between 1 and 2 accounts, because that's where the largest progression step lies. Nevertheless: every additional account brings a noticeable improvement. Why not 10 accounts then? Because you can only withdraw them within the 5-year window before AHV retirement age — so earliest from 60, latest by 70. A maximum of 5 accounts makes sense in this time span. More accounts = more administrative effort without additional benefit.

We explain the withdrawal phase in detail in the companion article: Pillar 3a Staggered Withdrawal Over 5 Years. This article here focuses on the savings phase — what you should be doing today.

The rotation strategy explained

You open 5 separate 3a accounts and distribute your annual contribution rotating across them: Year 1 to Account A, Year 2 to Account B, ..., Year 5 to Account E, Year 6 back to Account A. This way all 5 accounts receive the same number of contributions over the years — and grow to roughly the same size.

Each account receives exactly one contribution per 5-year cycle. After 35 years of rotating contributions (age 30 to 65), each account has received 7 contributions in total.

Alternative: feed all 5 accounts simultaneously

There is an alternative to rotation: you can also distribute your annual CHF 7'258 across all 5 accounts simultaneously — so CHF 1'452 per account per year. Both strategies lead to similar end balances, with small differences depending on the provider (minimum balances, fee structures, booking effort).

In practice, rotation is easier to manage — one booking per year instead of five. We recommend it as the default approach.

Worked example: Lukas starts at 30

Lukas is 30, freshly in his engineering job, lives in the city of Zürich. He decides to make the maximum 3a contribution from now on — following the 5-account strategy. Assumptions: annual contribution CHF 7'258, average return 4% (securities-based 3a, long term).

The magic: the only thing Lukas did differently was opening five accounts instead of one. No better strategy, no higher return, no additional risk. Pure structural optimisation.

What if I only start at 45?

Reality: Few Swiss people start their 3a in a structured way at 25. Many opened a single account at 30, 35, or 40 and have stoically contributed there since. Maybe at their main bank, maybe with an insurance company. What if you only realise late that the structure is suboptimal?

The bad news: existing accounts cannot be split. The money on the old large account stays together and must be paid out in a single year.

The good news: you can run new accounts in parallel from today. Even a late multi-account strategy brings a noticeable saving. Let's look at three realistic late-starter scenarios:

Even at 55 it's still worth switching to a multi-account structure. You immediately open 2-3 new accounts, contribute CHF 7'258 to them annually from now on, and withdraw these in the final 2-3 years before retirement in a staggered manner. The old large account you then withdraw in the retirement year itself.

One provider or multiple?

This question splits the financial community. Both camps have good arguments.

Pro: one provider

• Simple administration: one app, one login, one overview
• Consistent strategy: all accounts in the same investment strategy is feasible
• Lower total effort: one booking for the annual max contribution
• Volume discount: some providers tier fees by total assets

Pro: multiple providers

• Real diversification: bankruptcy of one provider only affects you partially (although 3a assets are legally protected — see point below)
• Strategy mix: e.g. 3 accounts in securities (for growth) + 2 accounts in cash/defensive (for stability in withdrawal phase)
• Provider-switch flexibility: if one provider raises fees, you only need to move the affected accounts

The reality: safety is (almost) the same

3a foundations are legally separate from the bank's assets. In a bank's insolvency, your 3a balance remains protected — it is not part of the bankruptcy estate. Therefore, diversification for pure safety reasons is less critical than for free assets.

The most important aspect is the investment strategy: 5 accounts, all at the same bank, all 100% in cash, bring you no added value beyond the tax savings from staggering. Those who really use the strategy mix:

• Different investment strategies (cash + securities allocations)
• Different TER and cost structures
• Different provider philosophies (passive vs. active, bank vs. app vs. asset manager)

If you want to make a well-founded provider choice, read our detailed Pillar 3a Comparison 2026 and our guide on choosing a provider (Bank, Insurance or App).

Cash or securities per account?

Over a 35-year savings phase, the investment strategy decides more about your final assets than the 5-account structure. Anyone who contributes CHF 7'258 annually to a classic 3a savings account at 0.5% has around CHF 285'000 after 35 years. Anyone who puts the same money into a securities-based 3a at 5% average return reaches CHF 680'000 — over CHF 395'000 more.

The glide-path question

Should one become more defensive as retirement approaches? There are two approaches:

The academic literature (keyword: glide path studies, Vanguard Research) shows: for most savers, Approach 1 is the better choice. The complexity of Approach 2 only pays off if you really want to squeeze the optimum out of the last 5 years — and even then the difference in end balance is manageable.

Typical mistakes in the savings phase

1. Only a single 3a account. The most common mistake. Prevents any staggering — you must withdraw everything in one year.
2. 5 accounts all at the same bank with the same strategy. Brings nothing but administrative effort. If 5 accounts, then at least 2 different investment strategies.
3. Cash instead of securities. Forfeits several hundred thousand francs in returns over 30 years. Securities-based 3a is now available with every serious provider.
4. Not maximising the maximum contribution. Anyone contributing only CHF 5'000 instead of CHF 7'258 annually gives up around CHF 750 in tax savings per year — that's CHF 22'500 over 30 years.
5. Contribution at year-end instead of beginning. Anyone contributing in January instead of December gains 11 months of compound interest. Over 35 years = several CHF 1'000.
6. Not contributing annually. "I don't have time this year" — and the tax saving is gone. Standing orders solve the problem.
7. Not retroactively contributing missed years. Since 2025, retroactive contributions have been possible — up to 10 years back. Anyone not using this gives up significant amounts (→ 3a Retroactive Contributions 2026).
8. Switching providers every few years. Anyone switching providers every 5 years accumulates transfer costs and administrative effort. Stability beats minor optimisation.

What you should do now

Frequently asked questions: 5-account strategy