Honestly for the first go around, I'd just get a tax advisor to do it or speak to the tax office. We chose the regional firm that provide an annual tax change update to the local branch of the Homeowners association, so absolutely not the cheapest and it cost about CHF 1,000, but with spending about CHF 450k in total on a complete renovation, we wanted to make sure we got it right regarding what could be claimed and what was classed as maintenance/repairs and what was value-adding. They were well worth the fee. In hindsight it may have made sense to push anything that was judgement based towards value-improving, as the marginal rate on capital gains is higher than the marginal rate on income tax in SZ, but hey ho.
Nevertheless, based partly on our experience and a general understanding of the rules...
- boiler repair (parts and installation) YES
- bank transfer and postage fees relating to deposit and notary fees - NO
- notary fees and taxes - NO
- lawyer fees relating to the purchase - NO
- sundry decorating items - like paint, or screws - YES
- tools used for DIY repairs and renovations - NO
- Replacing the chimney - YES
- Delivery charges for materials used for renovation - PARTLY - renovation suggests improvements i.e. value adding. Only the part relating to like for like replacement deductible now
- Life insurance required by the mortgage provider - Probably as part of your overall insurance tax deduction
- Building insurance, - NO
- civil responsibility insurance - NO
- Chimney inspection, gas appliance inspection, electrical installation inspection UNSURE
- electrical appliances (I understand a washing machine replacement is deductible) - YES if like for like replacement, partly if upgrades, value adding if new e.g. you didn't have a steamer before
- coproperty owner monthly charges to the maintenance fund - NO this is actually an asset until spent