1. Establish the funds you can use
Keep a reserve for expenses and unexpected costs. Distinguish making a new 3a contribution, stopping a contribution and withdrawing existing assets. For a 3a insurance policy, check commitments, charges and cover before changing payments. Reducing contributions is not a universal strategy for financing panels.
2. Assess each option’s tax effects
The FSIO explains that 3a contributions are deductible within applicable limits, benefits are taxed and assets are not freely accessible. Solar expenditure follows different conditions. Confirm eligible expenses, grants to account for, tax year and any carry-forward for your building and canton. Do not assume identical effects or a full deduction for every project.
3. Calculate the full solar result
Separate installed cost, confirmed grants, avoided purchases and feed-in revenue. Include maintenance, finance, losses and replacements. Use monthly generation and your hourly consumption. Gross savings divided by investment do not establish a net return. Test lower feed-in tariffs, changed consumption and higher costs.
4. Compare risks and time horizons
For 3a, use the actual account, portfolio or policy terms, including charges and investment risk. For solar, consider how long you will own the building, faults, roof work and tariffs. A system guarantees neither recovery of its cost in a higher resale price nor constant income. Compare retirement resources after tax.
5. Have a withdrawal assessed before ordering
Ask the 3a institution whether the specific work can be financed, which documents it requires and which tax and contractual consequences apply. Compare savings and borrowing as well. Catch-up 3a contributions introduced in 2026 for gaps from 2025 are conditional: confirm eligibility rather than assuming every missed contribution can be recovered.