Aargau Income Tax Service

Aargau Income Tax Service – Cross-Border & Private Clients

We support clients resident in canton Aargau with Swiss income and wealth tax filings, typically in cases involving substantial assets, holding structures and cross-border obligations to the US or Germany. This page outlines our Aargau-specific service scope and fixed-fee packages.

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Service scope for Aargau income tax

For clients residing in canton Aargau, we handle income and wealth tax returns at cantonal and municipal level, with a clear focus on complex and cross-border profiles. Typical elements of an Aargau mandate include:

Aargau income tax return (canton & municipality)
Annual wealth tax calculation and reporting under Aargau rules
Equity compensation (RSUs, stock options, carried interest, bonus shares)
Investment income, structured products, foreign bank and brokerage accounts
Self-employment, partnership interests and holding/management companies
Coordination with US and/or German returns – foreign tax credits, treaty application and timing

For technical background on Aargau income tax and cross-border topics, see the Aargau section of our Swiss Income Tax Guide . Wealth tax specifics for canton Aargau are covered in the Aargau Wealth Tax Hub .

Aargau income tax packages & pricing (Swiss side)

The packages below describe our Swiss-side work for canton Aargau via Sesch TaxRep GmbH. Where US or German returns are required, these are prepared and invoiced separately by Sesch USA LLC and/or Sesch Group GmbH Wirtschaftsprüfungsgesellschaft. All Swiss-side fees are in CHF and exclude VAT.

Package	Typical profile	Scope (Swiss side)	Fee (CHF)
Aargau Complex Swiss Only Income & wealth tax (no foreign filings)	Resident in canton Aargau Significant salary/bonus and/or investment income Portfolio, real estate and wealth tax exposure No parallel US or German tax return	Aargau income tax return (canton & municipality) Wealth tax calculation and annual return Reporting of pensions, deductions, investment and property income Assessment review and response to straightforward tax office queries	From CHF 1’100 to CHF 1’900 Depending on income level, number of accounts and asset complexity.
Aargau–US Cross-Border Swiss + US individual returns	Aargau resident with US citizenship/green card Salary/bonus, equity compensation, global portfolios Swiss and foreign bank/brokerage accounts; possible PFIC/FBAR/FATCA issues	All items from the Aargau Complex Swiss Only package Swiss-side coordination with US returns (foreign tax credits, treaty positions) Income and asset mapping for US reporting in cooperation with Sesch USA LLC	Swiss side: CHF 1’500 – 2’300 US return prepared and invoiced separately by Sesch USA LLC (typically from USD 1’800).
Aargau–Germany Cross-Border Swiss + German individual returns	Aargau resident with German tax ties (residence history, income or assets) Employment, pension, investment or business income between Switzerland and Germany	All items from the Aargau Complex Swiss Only package Application of the Germany–Switzerland tax treaty on the Swiss side Coordination with the German return on sourcing and double tax relief Joint review with Sesch Group GmbH Wirtschaftsprüfungsgesellschaft	Swiss side: CHF 1’500 – 2’300 German return invoiced separately (typically from EUR 1’500).
Aargau Private Client Plus Advanced cross-border / entrepreneur	Entrepreneurs, partners or significant shareholders Holding or management companies in Aargau and abroad Multi-jurisdiction income (dividends, carry, partnership income, interest)	Tailored Aargau income and wealth tax planning and returns Coordination with corporate, holding or partnership structures Integrated cross-border planning with US/German advisors Extended support for tax audits, rulings and complex authority queries	Swiss side: from CHF 2’600 Custom quote depending on structure, entities and jurisdictions involved.

After an initial consultation and review of your situation, we will confirm the most suitable Aargau package and provide a written fixed-fee quote before starting any work.

How the Aargau income tax process works

1. Discovery call

A 20-minute call to clarify your residence in canton Aargau, your income sources, asset structure and any US or German tax connections. We confirm that your case fits our cross-border and private client focus.

2. Engagement & onboarding

You receive a joint engagement pack clearly separating:

The Aargau income and wealth tax mandate with Sesch TaxRep GmbH
Where applicable, the US mandate with Sesch USA LLC and/or the German mandate with Sesch Group GmbH Wirtschaftsprüfungsgesellschaft
Data protection, information sharing and billing principles

3. Unified intake & secure upload

We use a single intake questionnaire and secure document portal for all jurisdictions. Salary statements, bank and portfolio reports, pension documents, equity compensation data and real estate details are collected once and allocated internally to the Swiss, US and German teams.

4. Draft returns & cross-border alignment

The Aargau team prepares draft income and wealth tax returns, while the US and/or German teams prepare their filings. We coordinate sourcing, foreign tax credits and treaty positions so that all returns are consistent and defensible.

5. Review, sign-off & filing

We walk you through the key Aargau figures (taxable income, net wealth, effective rates) and how they interact with US or German outcomes. After you approve, we file the Aargau returns electronically or by post and monitor assessments and deadlines.

6. Invoicing

Separate invoices are issued by each legal entity (Swiss, US, German). On request, we can align billing in CHF, USD or EUR and provide an overview of the total engagement cost.

Who we typically work with in Aargau

Executives with international roles and equity compensation packages
US citizens/green card holders or German taxpayers living in canton Aargau
Entrepreneurs, partners and significant shareholders with cross-border structures
Families with substantial portfolios, holdings or property and wealth tax exposure

Purely domestic Aargau salary-only cases without cross-border or wealth tax complexity are generally outside our core focus and better served by mass-market providers.

Talk to an Aargau income tax specialist

If you are resident in canton Aargau and your situation involves cross-border elements or significant assets, we are happy to discuss the appropriate package and next steps in a complimentary 20-minute discovery call.

Book your free consult