Indirect amortization with the 3rd pillar
Indirect amortization with the 3rd pillar is one of the most widely used tax strategies by property owners in Switzerland. By pledging your pillar 3a instead of directly repaying your mortgage, you benefit from a double tax deduction. Here is how this mechanism works and why it can save you thousands of francs.
How indirect amortization works
The principle is simple: instead of paying money to your bank to reduce your mortgage (direct amortization), you pay that money into your pillar 3a, which is pledged with the bank as security.
- You take out a pillar 3a and pledge it with your mortgage bank
- Each year, you make your 3a contributions (max. CHF 7,258 in 2026 for an employee with 2nd pillar)
- Your mortgage remains at the same level: you do not repay it directly
- At retirement or contract maturity, the 3rd pillar capital is used to repay part of the mortgage
The double tax deduction
The main advantage of indirect amortization is the double tax deduction:
Deduction 1: 3a contributions
Your annual payments to the 3rd pillar (up to CHF 7,258) are fully deductible from your taxable income. This applies whether or not you pledge your 3a.
Deduction 2: Mortgage interest
Since your mortgage remains higher (no direct amortization), the interest you pay is higher and therefore the tax deduction is greater.
Numerical comparison: direct vs indirect
Let us take a concrete example to illustrate the difference. Assumptions: property at CHF 800,000, initial mortgage of CHF 640,000 (80%), mortgage rate of 2%, marginal tax rate of 35%, 3a contribution of CHF 7,258/year over 20 years.
Direct amortization
| Item | Annual amount | Tax impact |
|---|---|---|
| Annual amortization | CHF 7,258 | Not deductible |
| Mortgage interest (average) | CHF 11,350 | Deductible: -CHF 3,972 |
| 3a contribution | CHF 0 (no remaining budget) | - |
| Annual tax saving | CHF 3,972 |
Indirect amortization
| Item | Annual amount | Tax impact |
|---|---|---|
| Direct amortization | CHF 0 | - |
| Mortgage interest | CHF 12,800 | Deductible: -CHF 4,480 |
| 3a contribution (pledged) | CHF 7,258 | Deductible: -CHF 2,540 |
| Annual tax saving | CHF 7,020 |
Indirect amortization advantage: +CHF 3,048/year
Over 20 years, this represents an additional tax saving of approximately CHF 60,000. The exact advantage depends on your canton, your tax rate and the mortgage rate.
Pledging in practice
Pledging is a contract between you, your 3a institution and your mortgage bank. Here are the key points:
- The capital stays in the 3a: You do not withdraw it; it continues to grow and benefit from tax advantages
- The bank has a guarantee: In case of default, the bank can access the pledged capital
- You continue contributing: Your annual payments fund the pledged 3rd pillar
- At maturity: The capital is used to repay the 2nd rank mortgage
Documents required for pledging
- Pledging contract (provided by the bank)
- Insurance policy or 3a account certificate
- Spousal consent (if married)
- Mortgage contract
Bank or insurance 3rd pillar for indirect amortization?
Both types of 3rd pillar can be used for indirect amortization, but they have different characteristics:
| Criterion | Bank 3a | Insurance 3a |
|---|---|---|
| Payment flexibility | Free (0 to max.) | Fixed mandatory premium |
| Death/disability coverage | Not included | Included |
| Return | Variable (funds, account) | Guaranteed (+ potential surplus) |
| Early cancellation | No penalty | Significant penalties |
The bank 3rd pillar is generally recommended for indirect amortization due to its flexibility. The insurance 3rd pillar may be relevant if you want death/disability coverage linked to your mortgage. To compare, see our free quote service.
Points of attention
- Withdrawal tax: When the pledged 3rd pillar is used to repay the mortgage, a capital benefits tax is due. Plan the staggering with multiple accounts.
- Imputed rental value: The higher mortgage does not reduce the taxable imputed rental value of your property.
- Rate changes: If mortgage rates increase significantly, the interest cost may exceed the tax advantage. Stay vigilant.
- Changing banks: Pledging can complicate switching mortgage banks. Check the transfer conditions.
When to switch from indirect to direct amortization?
Indirect amortization is not necessarily the best solution throughout the life of your mortgage. Several situations may justify switching to direct amortization or a mixed approach:
Approaching retirement
As you approach the reference age (65), banks generally require the mortgage to be reduced to a maximum of 65% of the property value. If your mortgage exceeds this threshold, direct amortization may become necessary. Moreover, at retirement, your income decreases and affordability is recalculated: high mortgage costs could be problematic.
If your marginal tax rate decreases
If your income decreases (switching to part-time, spouse stopping work), your marginal tax rate drops. The tax advantage of indirect amortization is directly proportional to this rate. With a marginal rate below 25%, the double deduction advantage diminishes noticeably and direct amortization may become more attractive.
When 3a capital reaches a high level
If you have several large 3a accounts, withdrawing all of them at retirement will generate significant capital benefits tax. In this case, it may be wise to withdraw one or more 3a accounts for direct amortization, spreading the tax burden over several years. To learn more about this strategy, see our page on 3rd pillar tax deduction.
Impact of interest rate changes on the strategy
The level of mortgage rates plays a determining role in the choice between direct and indirect amortization. Recent years have shown that rates can change rapidly, altering the financial equation.
Low rate environment (1% to 2%)
When mortgage rates are low, the cost of maintaining a higher mortgage is limited. Interest paid is low, but remains deductible. In this context, indirect amortization is generally very advantageous: the double tax deduction (3a contributions + mortgage interest) amply compensates for the additional interest. This was the prevailing situation in Switzerland between 2015 and 2022.
Moderate rate environment (2% to 3.5%)
With moderate rates, indirect amortization remains advantageous for taxpayers with a high marginal tax rate (30% and above). However, the difference with direct amortization narrows. It is recommended to regularly recalculate the net advantage taking into account your current tax situation.
High rate environment (above 3.5%)
If mortgage rates rise sharply, the additional cost of the higher mortgage may exceed the tax advantage. In this case, direct amortization or a mixed solution becomes preferable. It is important to note that the tax-deductible rates are the rates actually paid, not a theoretical rate. If your mortgage is at a fixed rate, switching to direct only makes sense at contract renewal.
Practical tip: At each renewal of your mortgage, ask your bank or advisor to recalculate the net advantage of indirect amortization versus direct. This analysis takes into account the new rate, your tax situation and the remaining duration of your mortgage.