The LPP buy-in (2nd pillar): tax advantage and rules

What is an LPP buy-in?

A buy-in means voluntarily paying money into your pension fund to fill a 'gap': the difference between the capital you have accumulated and the capital you could have accumulated with a full career. Gaps arise from a salary increase, years abroad, part-time periods or arriving late in Switzerland.

The maximum amount you can buy in is shown on your pension-fund certificate (your 'buy-in potential'). This extra capital increases your future pension or LPP lump sum.

The tax advantage of a buy-in

This is the main appeal: the amount paid in is fully deductible from your taxable income in the year of the contribution. The tax saving equals the amount bought in multiplied by your marginal tax rate, which can be very large for high earners.

In short: you move money from your taxes into your pension, while increasing your retirement capital. The higher your tax rate, the more attractive the buy-in.

The rules and limits to know

Two important rules frame buy-ins. First, the 3-year lock-up: after a buy-in, the corresponding capital cannot be withdrawn as a lump sum for three years, otherwise the tax advantage is clawed back. So anticipate your buy-ins if you plan a lump-sum withdrawal.

Second, if you have withdrawn funds to buy your home (under home-ownership promotion), you must first repay that withdrawal before you can make deductible buy-ins.

Staggering buy-ins: the winning strategy

Because income tax is progressive, buying in a large sum in a single year has a decreasing tax return. Spreading buy-ins over several years, typically the 5 to 10 years before retirement, maximises the total tax saving.

The right timing depends on your income, your buy-in potential and your planned retirement date. RetirePlan quantifies this trade-off precisely.

The buy-in in your planning

A buy-in is not an isolated decision: it interacts with your pension-versus-lump-sum choice, your withdrawal strategy and your cantonal taxation. Well planned, it improves both your retirement income and your tax bill.

RetirePlan models your buy-ins within the overall projection: it shows how much to buy in, when, and the net effect on your retirement and your taxes.

Frequently asked questions

What is an LPP buy-in?

It is a voluntary payment into your pension fund to fill your provision gaps. It increases your 2nd-pillar capital and is deductible from your taxable income. The maximum amount is shown on your LPP certificate.

What is the tax advantage of an LPP buy-in?

The amount bought in is fully deductible from taxable income in the year of the contribution. The tax saving equals the amount multiplied by your marginal rate, and is larger the higher your income.

Can you withdraw an LPP buy-in as a lump sum?

Yes, but not before three years: after a buy-in, the corresponding capital cannot be withdrawn as a lump sum for three years, otherwise the tax advantage is clawed back. So you must plan ahead.

Should you stagger your LPP buy-ins?

Usually yes. Because tax is progressive, spreading buy-ins over several years before retirement maximises the total tax saving compared with a single large contribution.