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Canton Aargau · tax year 2025

Your Aargau tax return, 2025

What Aargau charges on your salary, what each of its 197 communes costs, and where its limits differ from federal law.

Filing app
eTAX AARGAU
Deadline
31 March 2026Employees can file up to 30 June without asking, because Aargau sends no reminder before then; anything later needs a reasoned request to the tax office.
Communes
197Municipal rates from 48% to 127%
Build my guide freeWhat your commune costs

Your commune moves the bill more than you think

The canton levies its tax, then each commune adds its own rate on the same base. These bills come from the federal tax administration's 2025 calculator.

Household
Children
Gross salary

Aarau · capital, 96%

CHF 12’782

Federal CHF 1’705 · Canton CHF 5’940 · Commune and personal tax CHF 5’137

Oberwil-Lieli · lowest rate, 48%

CHF 10’214

Federal CHF 1’705 · Canton CHF 5’940 · Commune and personal tax CHF 2’569 · CHF 2’568 less than Aarau

Mellikon · highest rate, 127%

CHF 14’441

Federal CHF 1’705 · Canton CHF 5’940 · Commune and personal tax CHF 6’796 · CHF 1’659 more than Aarau

  • Federal
  • Canton
  • Commune and personal tax
Estimated income tax in each commune

Hover or tap a commune.

Tap a commune to see its bill.

All 197 communes by municipal rate

Each dot is a commune. Aarau is marked.

50%75%100%125%Aarau 96%

Lowest: Oberwil-Lieli 48%Highest: Mellikon 127%

Income tax figures: federal tax administration calculator, tax year 2025, retrieved 2026-09-16. One earner aged 35, employment income, no wealth, no church tax, and the standard deductions the calculator applies.

Bills for Aarau, Oberwil-Lieli and Mellikon are the calculator's own. Every other commune is scaled from the capital's base tax by that commune's rate, which matched the calculator to within CHF 40 where we checked.

Municipal rates: federal tax administration, tax year 2025. Boundaries: swisstopo.

Where Aargau is not the federal number

Your return is assessed twice, once for cantonal tax and once for federal tax. The same receipt can be worth more on one than on the other.

  • Insurance premiums, single

    AargauCHF 3’600
    FederalCHF 1’800
    Higher in Aargau

  • Insurance premiums, couple

    AargauCHF 7’200
    FederalCHF 3’700
    Higher in Aargau

  • Third-party childcare

    AargauCHF 25’000
    FederalCHF 25’800

    Per child under 14. Meals and board do not count.

    Lower in Aargau

  • Commuting

    AargauCHF 7’000
    FederalCHF 3’300
    Higher in Aargau

  • Second-earner deduction

    AargauCHF 600
    Federalup to CHF 14’100
    Lower in Aargau

Aargau grants this as a flat amount for everyone, whatever your premiums, with no add-on per child.

Deduction limits: Kanton Aargau: Wegleitung zur Steuererklärung 2025, Ziffer 14 (p.27); statute § 40 Abs. 1 lit. g StG via ESTV Kantonsblatt Aargau p.11. www.ag.ch

Deduction limits: Kanton Aargau: Wegleitung zur Steuererklärung 2025, Ziffer 15.0 (p.27); Merkblatt Kinderbetreuungskosten (Stand 1.1.2026). www.ag.ch

Deduction limits: Kanton Aargau: Wegleitung zur Steuererklärung 2025, Ziffer 10.1 (p.22). www.ag.ch

Deduction limits: Kanton Aargau: Wegleitung zur Steuererklärung 2025, Ziffer 16 (p.30). www.ag.ch

Deadline: Kanton Aargau: Wegleitung zur Steuererklärung 2025, 'Terminprobleme?' (p.10); ag.ch 'Steuererklärung einreichen'. Checked 2026-09-20

Let Aargau's limits apply themselves

Upload your documents once. PaperTax applies Aargau's own limits and tells you what to type into each field of eTAX AARGAU. You still submit it yourself.

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