2026 Pillar 3a Buy-In: Who Can Fill a 2025 Gap, and at What Cost?

Last updated: November 15, 2025 — This article is for informational purposes only and does not replace personalized tax or retirement planning advice.

Box — Sources and legal references

- Legal basis for the 3a buy-in: art. 7a of the Ordinance on Tax Deductions for Contributions to Recognized Pension Plans (BVV 3; SR 831.461.3), introduced by the amendment of November 13, 2024 (Official Compilation AS 2024 698), which entered into force on January 1, 2025. Consolidated text of BVV 3: Fedlex, SR 831.461.3. Federal Council press release of November 13, 2024 regarding this amendment: official admin.ch press releases. - First buy-in-eligible year: under art. 7a para. 1 BVV 3, only a gap recorded from the year the new article entered into force (2025) can be bought back, and only starting the following year (2026) at the earliest. This interpretation is reflected in the FSIO's information sheet on tied individual pension provision: FSIO – Pillar 3a, legal basis. - Annual 3a ceilings by status: set each year by the FSIO under art. 7 BVV 3 and published in its annual press release on occupational and tied pension values for the following year. For 2025 and 2026 amounts, see the press release FSIO – 2026 values for occupational and tied pension provision as well as the annual FTA notice on pillar 3a deductions: FTA – Direct Federal Tax, tied pension provision. - 2nd pillar (BVG) buy-in: governed by art. 79b of the Federal Act on Occupational Retirement, Survivors' and Disability Pension Plans (BVG; SR 831.40) and art. 60a of its implementing ordinance (BVV 2; SR 831.441.1). Art. 79b para. 3 BVG explicitly prohibits any lump-sum withdrawal within three years of a buy-in. - Taxation of 3a capital upon withdrawal: art. 38 of the Federal Direct Tax Act (DBG; SR 642.11) for the federal portion, and cantonal implementing provisions of art. 11 para. 3 of the Tax Harmonization Act (StHG; SR 642.14) at the cantonal level.

These references are provided for informational purposes; since the cited texts and press releases may be amended or relocated, please check the version in force on [Fedlex](https://www.fedlex.admin.ch/), the [FSIO](https://www.bsv.admin.ch/bsv/fr/home/prevoyance-vieillesse/vorsorge3.html) website, or the [FTA](https://www.estv.admin.ch/estv/fr/accueil/impot-federal-direct/impot-federal-direct.html) website, or with your 3a foundation before making any binding decision.

For a long time, pillar 3a operated under a strict rule: it was impossible to make up for a year with no contribution. Each tax year stood alone, with no way to offset a shortfall. This rigidity penalized self-employed people with irregular income, part-time employees, or anyone going through a professional transition period. This changes with the 2026 pillar 3a buy-in, a new development that finally allows a contribution gap to be filled retroactively. In practical terms, starting in 2026, it becomes possible to pay in an additional amount to "catch up" on 2025 if that year was not contributed to at the maximum level. This section explains the origin of this mechanism, its legal framework, and why it changes the game for private retirement planning in Switzerland.

What is the pillar 3a buy-in, and since when has it been possible?

Contrary to a common misconception, the pillar 3a buy-in does not stem from the AHV 21 reform, but from the introduction of art. 7a into the Ordinance on Tax Deductions for Contributions to Recognized Pension Plans (BVV 3), through the amendment of November 13, 2024 (AS 2024 698), which entered into force on January 1, 2025 (see the Sources and legal references box above for the exact links).

In concrete terms, the retroactive pillar 3a allows a taxpayer to pay, in a given year, an additional amount intended to compensate for an incomplete contribution from a previous year. This option did not exist before art. 7a BVV 3 entered into force: each contribution year was final, with no possibility of catching up.

2026 is the first year this possibility becomes concrete. Art. 7a para. 1 BVV 3 indeed limits the buy-in to gaps recorded from the year the new article entered into force, i.e. 2025, and specifies that this buy-in can only take place starting the following year. 2025 is therefore the first period for which a gap can be filled, with the buy-in payment occurring at the earliest in 2026.

Two concepts must be clearly distinguished:

• The ordinary annual payment: this is the standard contribution made each year, within the limit of the ceiling in force (with or without a 2nd pillar).
• The 3a buy-in: this is an additional payment, made after the fact, to fill a year in which the ceiling was not reached, within the framework set by art. 7a BVV 3.

The 3a contribution gap typically originates from several common situations:

• partial income, for example at the start of self-employed activity;
• a career interruption, such as maternity leave, a period of unemployment, or training;
• voluntary or involuntary under-contribution, due to a lack of available liquidity that year.

This new right therefore addresses a very concrete issue: allowing people who have experienced income irregularities to make up their tax-advantaged savings capacity, without being permanently penalized. If you are also considering an [early withdrawal of pillar 3a](/retrait-anticipe-pilier-3a/) for a property purchase, keep in mind that the two processes follow separate rules.

What are the conditions for buying back pillar 3a years in 2026?

The pillar 3a gap buy-in cannot be improvised: art. 7a BVV 3 sets out precise conditions that determine who can benefit from it and under what circumstances. For the exact legal wording, refer to the consolidated text of BVV 3 on Fedlex and the explanations from the FSIO.

Income subject to AHV contributions during the relevant year

To buy back 2025, art. 7a para. 1 BVV 3 requires having received income subject to AHV contributions during the relevant year. Without gainful employment, it is impossible to justify a contribution gap: the buy-in assumes that a contribution could have been made, but was not made in full. Partial salary, modest self-employed income, or irregular income are sufficient, as long as they are certified by AHV affiliation (general information on ch.ch, AHV contributions).

Having first paid the maximum contribution for the current year

Another condition set by art. 7a BVV 3: before filling the gap for 2025, the maximum 3a contribution for the current year must have been paid for 2026. The buy-in therefore comes as a supplement, never as a replacement for the ordinary annual payment. The exact ceiling for 2026 is set by the FSIO and published in its annual press release on occupational and tied pension values: it is recommended to consult this dated document, or your 3a foundation, before calculating your buy-in capacity.

A strict time limit

Only years following the entry into force of art. 7a BVV 3 (January 1, 2025) are eligible. It is not possible to go back before 2025: by design, the article grants no retroactive effect beyond that date, meaning earlier gaps cannot be filled through this mechanism.

Exclusion cases

Finally, certain situations exclude the buy-in, in accordance with art. 7a BVV 3:

• total absence of AHV-subject income during the relevant year;
• people with no gainful employment (pensioners, unemployed students);
• years prior to 2025, not covered by the new mechanism.

These conditions outline a strict framework, designed to target genuine professional gaps rather than to open up a generalized tax catch-up mechanism.

How do you calculate your pillar 3a contribution gap?

Before considering a buy-in, a precise gap calculation must be established. This step relies on a simple comparison: the amount actually paid in 2025, versus the 2025 pillar 3a ceiling that applied according to professional status, as published by the FSIO for that year.

Comparing payments and the legal ceiling

The method is straightforward: subtract the total paid in 2025 from the maximum ceiling authorized that year. The difference constitutes the buy-in-eligible gap. As a simplified illustration: an employee who paid in CHF 4,500 while the 2025 ceiling published by the FSIO was a fixed amount (see the FSIO press release on 2025 values for the exact figure in force) would have a gap corresponding to the difference between these two amounts.

Checking bank or insurance certificates

Each payment made into a 3a account or policy results in an annual 3a certificate, issued by the bank or insurer. This document shows the exact amount paid during the calendar year. It must be compared against the legal ceiling published by the FSIO to establish the gap objectively, rather than relying on a rough estimate.

Employees and self-employed: different ceilings

The calculation varies depending on status:

The exact amounts (fixed figures and percentages) are published each year by the FSIO under art. 7 BVV 3; consult the annual press release on pension values before any final calculation. An employee without a pension fund or a self-employed person must recalculate their own ceiling, proportional to their income, before determining the actual gap.

Required documents

To build a solid file, you need to gather:

• the AHV salary certificate for the relevant year;
• the 3a certificates from each bank or insurance institution;
• the AHV statement confirming contributions actually paid;
• a copy of the 2025 tax return, if it already mentions 3a payments.

These documents will make it possible to justify the gap to the pension institution at the time of the buy-in.

What is the maximum amount that can be bought back, and at what tax cost?

The maximum buy-in amount strictly corresponds to the gap calculated above: the difference between the legal ceiling for the missed year (set by the FSIO under art. 7 BVV 3) and the amount actually paid. It is not possible to buy back more, even if financial capacity would allow it. This cap, enshrined in art. 7a BVV 3, prevents the mechanism from being diverted for purely tax-optimization purposes.

A tax deduction on the same basis as an ordinary contribution

The buy-in benefits, in principle, from the same tax deduction as a standard pillar 3a payment, under art. 33 para. 1 let. e DBG for direct federal tax. It reduces taxable income for the year in which it is made, not for the year being bought back. For the exact rule applicable in your canton, refer to your [cantonal tax administration](/fiscalite-cantonale-suisse/) or to our guide on Swiss cantonal taxation.

Numerical examples (illustrative simulation)

Simplified example, not personalized tax advice. Actual marginal rates depend on income, family situation, and canton of residence; use an official tax calculator for a reliable estimate.

These figures, purely illustrative, show that the tax savings depend directly on the marginal rate, which is itself linked to income and the cantonal tax scale.

Variations by canton

The tax impact of a buy-in varies significantly from one canton to another, due to the progressive tax scales specific to each jurisdiction (cantonal application of the StHG). Rather than putting forward generic amounts, it is preferable to simulate the exact impact via your tax return or an official cantonal calculator (several cantons, including Geneva, Vaud, and Zurich, offer online simulators on their cantonal tax administration websites) before deciding on the amount to buy back.

Pillar 3a buy-in vs. pillar 2 (BVG) buy-in: what are the differences?

The BVG buy-in and the pillar 3a buy-in pursue the same goal — filling a pension gap while reducing taxes — but their rules differ significantly. The provisions applicable to the 2nd pillar fall under art. 79b of the Federal Act on Occupational Retirement, Survivors' and Disability Pension Plans (BVG) and art. 60a of its implementing ordinance (BVV 2); see the texts on Fedlex – BVG, SR 831.40 and Fedlex – BVV 2, SR 831.441.1. Understanding this difference allows for an informed choice between the two mechanisms.

Note on the evolution of the mechanism: as of now, only 2025 is buy-in eligible (in 2026), in line with the initial scope of art. 7a BVV 3. In subsequent years, new gap years will mechanically be added as the mechanism applies over time — without, however, allowing one to go back before 2025 under the current text.

This table offers an educational summary; the exact regulations of your pension fund always take precedence for the 2nd pillar. The major difference lies in the time depth involved: a BVG buy-in allows you to catch up on several decades of missing contributions, sometimes for substantial amounts, whereas pillar 3a, for now, only allows catching up limited to the previous year.

Combining both is possible

In principle, nothing prevents combining a 3a buy-in with a BVG buy-in during the same tax year. A taxpayer could thus buy back their 2025 pillar 3a gap while also making a BVG buy-in with their pension fund in 2026. The two deductions would add up and reduce taxable income accordingly, subject to each fund's specific rules (art. 79b BVG, art. 60a BVV 2) and provided that available liquidity allows it. To learn more about this topic, see our [dedicated article on the 2nd pillar (BVG) buy-in](/rachat-2e-pilier-lpp/).

Impact on capital and withdrawal

A BVG buy-in strengthens occupational pension capital, which is often larger than that of pillar 3a, with a generally more significant tax impact upon withdrawal given the amounts involved. The 3a buy-in, more modest in scale, remains a targeted supplement but can be combined with other 3a accounts opened in parallel.

Pillar 3a buy-in or free investment: which option is more profitable?

The question arises as soon as the taxpayer has available savings. On one hand, the buy-in offers an immediate potential tax deduction. On the other, a free investment — securities account, index fund, or real estate — retains full liquidity, with no lock-up constraint.

Frozen liquidity: the price of the tax advantage

A buy-in turns an available sum into liquidity frozen until retirement, except for early release grounds (purchase of a primary residence, permanent departure from Switzerland, self-employment). This rigidity is the main risk: it is impossible to respond to an unexpected financial need without heavy costs or formalities. For details on early withdrawal cases, see our [guide on early withdrawal of pillar 3a](/retrait-anticipe-pilier-3a/).

Return simulation over several time horizons

The return on a 3a account essentially depends on the interest paid by the foundation, which varies by institution (check directly with your 3a foundation or via an independent comparison site such as moneyland.ch), or on the performance of a securities-based 3a. The table below is a simplified simulation, based on the assumption of a single payment of CHF 5,000 compounded over time, excluding fees and intermediate taxation:

Over the long term, a dynamic investment can significantly outperform the initial tax gain from the buy-in, especially at a 6% return — but this scenario also carries a risk of capital loss, which is absent from a standard 3a account.

Deferred taxation: pillar 3a's advantage

Taxation upon withdrawal of pillar 3a remains a strong argument: under art. 38 DBG and the cantonal implementing provisions of the StHG, the withdrawal tax is calculated separately from income, at a reduced rate, unlike the gains from a free investment, which may be subject to wealth tax each year depending on the vehicle chosen. For the precise rules applicable in your canton, see our page on [cantonal taxation in Switzerland](/fiscalite-cantonale-suisse/).

A pragmatic trade-off

The buy-in is convincing for profiles close to retirement or with a high current tax burden. Free investment appeals to younger taxpayers with a long time horizon and a higher risk tolerance. A combination of both is often the most balanced strategy.

Special cases and practical steps for making your buy-in in 2026

Certain situations change the usual buy-in rules and deserve particular attention before making a payment.

Self-employed people without a 2nd pillar

The buy-in for a self-employed person follows a different ceiling: up to 20% of net income from gainful activity, with an annual maximum amount significantly higher than that of employees affiliated with a BVG plan, in accordance with art. 7 BVV 3. The gap calculation is then based on this expanded ceiling rather than the standard fixed amount, which complicates the assessment without the help of a comparison tool or tax advisor.

Returning from expatriation

Someone returning from living abroad cannot fill gaps for years spent outside the country: art. 7a BVV 3 requires AHV-subject income for the relevant year, a condition that can only be met since returning to Switzerland with effective AHV affiliation. Years spent abroad are therefore excluded from the calculation, even for Swiss nationals. See our [content dedicated to retirement planning for expatriates in Switzerland](/prevoyance-expatries-suisse/) to learn more about this point.

Interaction with an early withdrawal

An early withdrawal for the purchase of a primary residence, or a permanent departure from Switzerland, interrupts the reference period used to calculate the gap: it is no longer possible to buy back years prior to that withdrawal. Only gaps arising after the new payment are taken into account, in line with the logic of art. 7a BVV 3 and the FSIO's explanations of its practical application.

Concrete steps with your bank or insurer

The process involves contacting your bank or insurer, requesting a gap certificate if available, then making the transfer before the deadline set by your foundation for the 2026 tax year. This year-end deadline is generally communicated directly by 3a foundations in their year-end client communications (see for example the information published each autumn by VIAC, Finpension, or Swisscanto); this is a standard foundation practice rather than a deadline set by federal legislation. As a precaution, it is best to make the transfer before mid-December to account for year-end banking delays.

Tax return and supporting documents

For the tax return, the foundation's annual certificate is generally sufficient: it states the amount paid and must be attached to the return to validate the deduction from taxable income under art. 33 para. 1 let. e DBG. The precise filing procedures are available on the website of the FTA – direct federal tax or your cantonal tax administration.

FAQ: pillar 3a buy-in in 2026

Is the pillar 3a buy-in mandatory?

No. It is a purely voluntary process, undertaken solely at the initiative of the holder of the 3a account or policy. No one can be penalized for choosing not to fill a gap, and no automatic reminder is provided for under art. 7a BVV 3 or sent by foundations or insurers.

Is the buy-in permanently lost once the deadline has passed?

The text of art. 7a BVV 3 does not provide for a mechanism carrying forward an unfilled gap beyond the year following the one in which it arose: a 2025 gap not bought back in 2026 can no longer be bought back later under this legal basis. Hence the importance of planning ahead rather than waiting until the last quarter — though it is still worth checking with the FSIO or your foundation in case of doubt about the application rules at the time of your request.

Who is entitled to benefit from the buy-in in 2026?

Anyone who received AHV-subject income during the year affected by the gap can, in principle, claim the buy-in under art. 7a BVV 3, whether an employee, a self-employed person, or, under certain conditions, a person with no gainful employment affiliated with AHV through a working spouse. The absence of AHV income for the relevant year automatically excludes any buy-in for that period. For an official check of your situation, AHV/IV offers general information on ch.ch.

Can a 3a buy-in be combined with a BVG buy-in in the same year?

Yes, in principle. The two mechanisms operate independently — one governed by art. 7a BVV 3, the other by art. 79b BVG — each with its own ceiling and tax rules (see the dedicated section above). A taxpayer can therefore consider buying back 2nd pillar years while also filling a pillar 3a gap, subject to the limits set by each system and their overall financial capacity.

Conclusion: planning your 3a buy-in before the end of 2026

The 2026 pillar 3a buy-in follows a precise logic set out in art. 7a BVV 3, not a last-minute improvisation. Two conditions structure the entire mechanism: having received AHV-subject income during the 2025 year affected by the gap, and having already paid the maximum 2026 contribution into one's 3a account or policy. Without this second point, no retroactive buy-in is possible, regardless of the account holder's personal situation.

Beyond these eligibility criteria, the appeal of the buy-in lies in its dual function. On one hand, it strengthens individual retirement savings by filling an uncontributed year, resulting in potentially stronger retirement capital over time. On the other, it generates an immediate tax deduction under art. 33 para. 1 let. e DBG, often more advantageous than a standard free investment, which offers no equivalent tax relief on entry. This combination of retirement planning and tax benefits remains the central argument in favor of the buy-in, provided the taxpayer's financial situation allows it without straining liquidity.

However, ceilings, supporting documents, and payment procedures vary depending on the foundation and the canton. It is therefore essential to verify these elements directly with your bank, insurer, or cantonal tax administration before proceeding — all figures mentioned in this article are indicative and should be confirmed via the official sources cited in the box at the beginning of the article (Fedlex, FSIO, FTA). A misinterpreted gap certificate or an incorrectly calculated ceiling can jeopardize the expected deduction.

The end of the year marks an important deadline for the transfer: find out precisely from your foundation about the value date used for the 2026 tax year. Banking deadlines tighten in December, making any tax optimization harder to secure at the last minute.

The simplest approach is therefore to contact your bank or 3a insurer now, request a simulation of the buy-in amount, and plan the transfer before mid-December. This forward planning avoids technical refusals and ensures the intended tax effect for the current year. To go further, also see our content on [early withdrawal of pillar 3a](/retrait-anticipe-pilier-3a/), [2nd pillar (BVG) buy-in](/rachat-2e-pilier-lpp/), and [cantonal taxation in Switzerland](/fiscalite-cantonale-suisse/).