Background
#Anyone planning a photovoltaic system in Aargau should not look at the tax logic only when filling in the tax return.
The cantonal factsheet on property maintenance covers energy-saving and environmental investments, the choice between actual costs and the flat-rate deduction, and self-borne costs after subsidies. At the same time, Aargau guidance explains that feed-in credits can be taxable, while solar power used directly and simultaneously by the owner is not taxed.
For owners this means: quote, incentive application, invoices, electricity credits and self-consumption belong in the same project file from the start.
For your roof
What the deduction means for your home
The report for your address combines the one-off payment, cantonal incentives and tax deduction, with net investment and payback.
Free and non-binding · no unsolicited calls
Rather talk directly? +41 78 615 90 58
What drives the economics
#The most important distinction is: existing building or new-build. The Aargau factsheet applies the deduction practice to private property and distinguishes energy and environmental measures in existing buildings from non-deductible capital or value-increasing costs. The tax question therefore belongs early in project planning, especially if roof renovation, extension or replacement construction coincides with the PV system.
Incentive contributions reduce the tax-relevant cost base. The factsheet states that for subsidised measures only the costs borne by the taxpayer can be deducted. For PV projects this means: Pronovo one-time remuneration and any municipal contributions must be documented separately from the gross quote, final invoice and payment records.
Actual costs and the flat-rate deduction are a choice per tax period and property. The Aargau factsheet describes the flat-rate deduction as an alternative to actual costs; anyone wanting to claim large PV invoices must prove them with receipts and must not mix that logic with an additional flat-rate deduction.
Battery storage, contracting and mixed projects need their own review. The Aargau factsheet treats contracting differently if the contractor remains owner of the system, and it does not list first-time battery installation in the same blanket way as the PV system itself. Anyone combining storage, wallbox, roof renovation and PV should have invoices separated cleanly.
Electricity revenues are not the same as self-consumption. Aargau guidance explains that credits for the full amount of energy delivered to the grid constitute taxable income; solar power consumed directly and simultaneously by the owner is not taxed. Monitoring and billing data help make this distinction traceable later.
The process in six steps
#Tick off for your project
Before the quote, clarify the building case
existing private property, new-build, replacement construction, condominium ownership, rented property or business assets. This classification determines which tax logic can be reviewed at all.
Structure quote and invoice so they are tax-readable
have PV system, electrical work, scaffolding, roof work, battery, wallbox, planning, fees and any roof renovation shown separately where possible. This makes later assessment easier and avoids blanket mixed line items.
Document incentives separately
keep the Pronovo application, payment confirmation and any further contributions. For tax purposes, the gross investment alone is not decisive; what matters is which costs were actually borne after contributions.
Choose the deduction method consciously for the tax year
actual costs with receipts or flat-rate deduction. For larger PV investments, the comparison matters; the definitive assessment belongs in the tax return or with the competent tax office.
Separate electricity revenues and self-consumption continuously
save feed-in credits, grid-operator statements and monitoring data. This keeps it traceable which electricity went to the grid and which was consumed directly in the building.
Have special cases checked before filing
contracting, battery storage, condominium ownership, tenant electricity models, business assets, roof renovation or replacement construction can change the classification. A general guide is not enough here.
Checked for your roof, not just read up on
What the deduction means for your home
The report for your address combines the one-off payment, cantonal incentives and tax deduction, with net investment and payback.
Free and non-binding · no unsolicited calls
Rather talk directly? +41 78 615 90 58
Frequently asked questions
#Sources
#The responsible authorities are decisive. Always verify binding details – amounts, deadlines and conditions – for your specific property against the current status of the respective authority.