Retroactive buy-back for pillar 3a: the 2026 innovation
This is one of the biggest innovations in Swiss pension planning in years. Since 1 January 2026, it is possible to retroactively buy back gap years in pillar 3a. A unique opportunity to strengthen your retirement savings and tax deductions.
What is it about?
Until the end of 2025, pillar 3a contributions not made in a given year were permanently lost. If you had not contributed the maximum amount (or nothing at all), it was impossible to make up for this shortfall.
Since 1 January 2026, the law now allows you to retroactively fill years where you did not contribute the maximum. In concrete terms, you can make an additional payment -- called a "buy-back" -- for each gap year of the last 10 years. This buy-back is tax-deductible and comes in addition to your regular contribution for the current year.
Conditions for the retroactive buy-back
To benefit from the retroactive buy-back, several conditions must be met:
1. Be eligible for pillar 3a in the year of the buy-back
You must exercise a gainful activity subject to AHV/OASI in 2026 to be able to make a buy-back. It is not enough to have had the right to 3a in the past; you must also have it at the time of the buy-back.
2. Have had the right to 3a during the gap year
You can only buy back years during which you were entitled to contribute to pillar 3a. If you did not have a gainful activity subject to AHV/OASI during a given year, that year cannot be the subject of a buy-back.
3. Years from 2025 onwards
Important: only gap years from 2025 onwards can be subject to a buy-back. Years prior to 2025 are not eligible. This means that the first effective buy-back will be possible in 2026 for the gap year 2025, and that the full scope of the measure (10 years back) will only be reached in 2035.
4. Maximum 10 years back
The buy-back period is limited to the last 10 years. In time, you will therefore be able to buy back up to 10 gap years simultaneously, representing a considerable additional contribution potential.
5. Have contributed the full amount for the current year
You must first have made your maximum regular contribution for the current year before making a buy-back. The buy-back cannot substitute for the current contribution.
How much can you buy back?
The buy-back amount corresponds to the difference between the 3a limit in force during the gap year and the amount actually contributed that year:
- If you contributed nothing: maximum buy-back = limit of that year (e.g. CHF 7 258.- for 2025/2026)
- If you contributed partially: maximum buy-back = limit - amount contributed
- One buy-back per gap year: you can only buy back one year per payment
Practical example for 2026
Jean, an employee, did not contribute to pillar 3a in 2025. In 2026, he can:
- Make his regular 2026 contribution: CHF 7 258.-
- Make a buy-back for the year 2025: CHF 7 258.-
- Total deductible in 2026: CHF 14 516.-
With a marginal rate of 30%, Jean saves approximately CHF 4 354,8.- in taxes instead of CHF 2 177,4.- -- double the usual saving.
Projection: the 10-year potential
In time, when the measure has reached full maturity (in 2035), an employee could potentially buy back up to 10 gap years:
| Number of gap years | Possible buy-back (cumulative) | Potential tax saving (30% rate) |
|---|---|---|
| 1 year | CHF 7 258.- | ~CHF 2 177.- |
| 3 years | CHF 21 774.- | ~CHF 6 532.- |
| 5 years | CHF 36 290.- | ~CHF 10 887.- |
| 10 years (maximum) | CHF 72 580.- | ~CHF 21 774.- |
The buy-back is limited to one gap year per payment. The exact amount depends on the limit of each year and the amount already contributed.
Optimisation strategy for the retroactive buy-back
Spread buy-backs over several tax years
Rather than buying back all your gap years in a single year, it may be more tax-efficient to spread buy-backs over several years. This allows you to benefit from the deduction in the highest tax brackets each year, rather than saturating the deduction in a single year.
Prioritise high-income years
Make your buy-backs in years when your taxable income is highest. The higher your marginal tax rate, the more advantageous the deduction.
Combine with the regular contribution
In 2026, you can combine your regular contribution of CHF 7 258.- and a buy-back of CHF 7 258.- for the year 2025 (if it was a gap year), for a total deduction of CHF 14 516.-. This is an exceptional tax opportunity.
Who is affected?
The retroactive buy-back potentially concerns a large number of people:
- Young professionals who did not start contributing at the beginning of their career
- People who went through difficult periods (unemployment, illness) during which they could not contribute
- Self-employed persons whose income fluctuates and who have not always contributed the maximum
- Cross-border workers who discovered the advantages of pillar 3a late
- Anyone who has not systematically contributed the maximum amount
How to proceed?
- Identify your gap years: request from your 3a provider(s) a statement of contributions made each year since 2025.
- Calculate the buy-back potential: for each year, calculate the difference between the limit at the time and the amount contributed.
- First make your regular 2026 contribution: the buy-back can only be made after reaching the current year's limit.
- Make the buy-back: pay the buy-back amount into your 3a account, specifying that it is a buy-back for the gap year concerned.
- Keep the supporting documents: retain the provider's certificate for your tax return.
The retroactive buy-back for self-employed persons
Self-employed persons without a pension fund benefit from an even greater buy-back potential, since their annual limit can reach CHF 36 288.-. The buy-back of a single gap year can therefore generate a considerably higher tax deduction.
Act now
The retroactive buy-back is a major opportunity to strengthen your pension planning and optimise your taxes. If you do not yet have a pillar 3a, discover how to open a 3rd pillar. Otherwise, request a personalised quote to assess your buy-back potential and set up the optimal strategy.