BVG buyback — buying into your Swiss pension.

Most expats learn about the BVG buyback years after it would have paid best. The mechanism is simple: you arrived in Switzerland mid-career, your Swiss pension only counts the years it has actually seen, and the law lets you pay in the missing ones — deducting every franc from your taxable income at your marginal rate. For high earners that’s 30–45% of the payment back in the same tax year. Mid-career arrivals routinely hold CHF 50,000–200,000 of this room. Almost none of them know, because the number sits on a document nobody reads: the Vorsorgeausweis.

What an Einkauf actually is.

Swiss occupational pensions (BVG / pillar 2) are capital-funded: your contributions and your employer’s accumulate in your own account inside the Pensionskasse. Retirement-savings contributions only begin from the January after you turn 24 — and only inside a Swiss fund. Every year before your arrival is a year your account never saw.

Article 79b BVG lets you close that gap voluntarily: the Einkauf (buy-in, buyback — the English terms vary, the mechanism doesn’t). You transfer money into your pension fund up to a personal maximum your fund calculates from your salary, age, and missing years. Two things happen: your retirement capital grows, and your taxable income shrinks by the full amount, in the year you pay.

The deduction stacks across all three Swiss tax layers — federal, cantonal, communal — which is why the saving runs at your marginal rate. In high-tax, high-income situations that’s the strongest single-year deduction available to a private individual in Switzerland.

Who has room — and why it’s usually expats.

A Swiss-born professional who joined a pension fund at 25 and never left has little or no buy-in room. The room belongs to people whose Swiss pension history is shorter than their career:

The mid-career arrival is the modal case. Land at 35 with a CHF 150,000 salary, and your certificate quantifies roughly a decade of missing Swiss pension years at today’s salary level — routinely a six-figure buy-in maximum. Salary jumps create room too (your history was saved at lower salaries than your current one), as do gaps — years abroad, career breaks, self-employment without a fund.

The number is not theoretical. It’s printed on your Vorsorgeausweis — the annual certificate your pension fund sends — usually on one line: maximale Einkaufssumme or possible purchase. If you’ve never looked, that line is where this article becomes personal.

The tax math, in plain numbers.

The saving equals your marginal rate times the buy-in. Illustrative, at a 35% combined marginal rate — a realistic band for a six-figure salary in many cantons:

A CHF 50,000 buy-in reduces taxable income by CHF 50,000 and returns roughly CHF 17,500 as tax saved in the same year. The other CHF 32,500 isn’t spent — it moved into your own retirement account, where it compounds tax-sheltered until withdrawal, and is later taxed at the privileged capital-benefit rate rather than as income.

Two refinements make the math materially better in practice:

Spread the buy-ins. One CHF 150,000 payment crushes one year’s income — and part of the deduction lands in lower brackets. Three tranches of CHF 50,000 across three high-earning years keep each deduction working at the top of your marginal band. This is the standard structure we model, not the exception.

Aim the tranches at peak years. Bonus years, exercised options, an unusually strong self-employment year — the buy-in belongs where your marginal rate peaks. The room doesn’t expire quickly; the bracket opportunity does.

The three rules that decide everything.

Buyback or 3a first — the sequencing.

Both are deductible; they’re different sizes and different speeds. Pillar 3a is the small, flexible, every-year lever — CHF 7,258 in 2026, six legal withdrawal grounds, fill it first and annually. The buyback is the large, slow lever: bigger numbers, locked longer, best deployed in tranches against your highest-bracket years.

For most mid-career arrivals the architecture reads: max the 3a every year, then schedule buy-in tranches across peak-earning years — after the three-year calendar is checked against any capital-withdrawal plans, and after the fund itself passes the read. The full pension architecture — where the buyback sits beside the 3a decisions and what late arrival does to your AHV years — is on our third-pillar pages.

The honest answer.

If you arrived in Switzerland mid-career and earn well, the BVG buyback is probably the largest tax lever you hold — and the most likely to be unused. The mechanism is friendly: your own certificate states the room, the deduction runs at your marginal rate, and the money stays yours, compounding for your own retirement.

The discipline is in the three rules — locked capital, the three-year clawback, the fund check — and in sequencing tranches against your best years instead of moving once and hoping. Bring the Vorsorgeausweis; the rest is arithmetic and calendar.