Filing your tax return costs time and nerves. The Aargau tax office leaves little room for interpretation, but offers some very attractive changes and higher deductions for the 2025 tax period. That makes it all the more important to know your legal options — and to use the statutory maximums in full. Our approach to your financial planning is simple: you pay only what you actually owe.
We have analysed the five most effective deductions and show you how to use them well.
Prefer to keep your head clear? Before you work through eTAX AARGAU yourself, take a look at our dedicated landing page for the Aargau tax return. There you will find everything about our smooth, fully digital process.
1. Insurance & Health Insurance Premiums
Your private premiums for health, accident, life, or annuity insurance — and savings interest — are deductible as a lump sum. Canton Aargau raised these allowances for 2025.
Maximum deduction (married):
- CHF 7,200 for cantonal and communal tax.
- CHF 3,700 for direct federal tax.
Maximum deduction (other taxpayers):
- CHF 3,600 for cantonal and communal tax.
- CHF 1,800 for direct federal tax.
The FIN tip: For direct federal tax, this deduction increases if you have not contributed to a pension fund or Pillar 3a (to CHF 5,550 for married couples or CHF 2,700 for singles). Federal tax also offers an additional CHF 700 per child.
More info: Comprehensive guide to Swiss insurance deductions
2. Job-Related Education and Training Costs
The tax authorities reward investment in your education. Canton Aargau raised the deduction significantly for 2025. You can deduct self-paid costs for job-related training and continuing education (provided you do not yet hold a Secondary II qualification).
Maximum deduction:
- CHF 18,000 for cantonal and communal tax.
- CHF 13,000 for direct federal tax.
The FIN tip: What counts is the date you pay. Because the cantonal deduction is now a generous CHF 18,000, you can often write off even very expensive courses in a single tax year.
More info: How to deduct education costs — a practical guide
3. Pillar 3a (Restricted Private Pension)
The classic of tax optimisation. Contributions to approved Pillar 3a solutions reduce your taxable income directly.
- Maximum deduction (with pension fund): CHF 7,258.
- Maximum deduction (without pension fund): 20 % of net earned income, up to CHF 36,288.
The FIN tip: Spread your 3a balance across up to three accounts. That lets you withdraw the funds in stages later and break the tax progression on payout. We recommend a maximum of three accounts to avoid questions from the tax office about possible tax avoidance. Important: factor in future pension fund withdrawals when you plan.
More info: Pillar 3a maximum amounts and investment strategies
4. Pension Fund Buy-In (2nd Pillar)
Voluntary buy-ins into your pension fund are fully deductible and noticeably reduce your taxable income.
Maximum deduction: limited by your individual coverage gap (see your current pension certificate).
The FIN tip: Mind the statutory three-year lock-up period. If you withdraw capital from your pension fund within three years of a buy-in (e.g. for home ownership), the tax office will reverse the deduction in a subsequent assessment. A withdrawal and a recent buy-in rule each other out.
More info: Pension fund buy-ins: building wealth and saving tax in one move
5. Third-Party Childcare Costs
If your children (under 14) are looked after externally, you can deduct those costs. New from 2025: Aargau has raised the deduction significantly and made it independent of the parents' work pensum.
Maximum deduction (per child):
- CHF 25,000 for cantonal and communal tax.
- CHF 25,800 for direct federal tax.
The FIN tip: The former 10 % cut for living expenses is fully dropped from 2025. What matters is that the costs are provable (receipts!) and directly connected to your work, education, or incapacity to work.
More info: Childcare and taxes in Switzerland
Canton comparison
Where does Aargau stand in the Swiss comparison?
At a glance: maximum cantonal deductions side by side.
Insurance premiums (married, cantonal)
Education & training costs (cantonal)
Third-party childcare per child (cantonal)
Your Path to a Smooth Tax Return
Filing on your own takes time and carries the risk of errors. If you want clarity and peace of mind, we handle it for you. Our expert team analyses your situation and delivers your tax return ready to file.
Profit from our modern approach: no paperwork, clear communication, transparent flat rates. Go directly to the FIN landing page for the Aargau tax return .
Sources and Further Information
The tax guidance is based on the official 2025 Canton Aargau tax return guide (PDF) . General information is available from the Cantonal Tax Office of Aargau .