Swiss Income Tax Service

Swiss Income Tax Service

Swiss Income Tax Service – Cross-Border Focus

We specialise in Swiss income tax for complex and cross-border cases, typically involving Switzerland and the US or Germany. We do not operate a mass-market Swiss-only tax return service – our work is focused on integrated, high-end mandates.

Who this Swiss income tax service is for

Our Swiss income tax service is designed for clients with complex or cross-border profiles, not for standard, purely domestic returns. Typical situations include:

  • Swiss residents with US or German tax obligations (citizenship, residence, source income)
  • Executives with equity compensation (RSUs, stock options, ESPPs) and international reporting
  • Entrepreneurs and shareholders with cross-border business interests
  • Clients with significant assets and parallel wealth tax considerations

Straightforward Swiss-only returns without cross-border elements are generally not taken on as stand-alone mandates. In selected cases (for example, inheritance tax clients or entrepreneurs), we may prepare domestic returns as part of a broader engagement – but this is not positioned as a public, mass-market service.

How our cross-border Swiss income tax process works

We handle Swiss income tax together with the relevant foreign returns through a single, coordinated process, while keeping legal entities and insurance strictly separate:

  • Switzerland: Sesch TaxRep GmbH – Swiss income and wealth tax, canton-level filings.
  • United States: Sesch USA LLC – US federal and state individual income tax, FBAR/FATCA.
  • Germany: Sesch Group GmbH Wirtschaftsprüfungsgesellschaft – German income tax and related advisory.

Step 1 – Initial consult (20 minutes, free)

We clarify residency, citizenship, income sources, cantons involved and whether US or German tax obligations apply. The goal is to confirm that your case fits our cross-border focus and identify the relevant jurisdictions.

Step 2 – Joint engagement letter

You receive a single engagement package with clearly separated sections:

  • Swiss engagement with Sesch TaxRep GmbH (Swiss law, Swiss insurance).
  • US engagement with Sesch USA LLC and/or German engagement with Sesch Group GmbH Wirtschaftsprüfungsgesellschaft, where applicable.
  • Common terms on data protection, information sharing and project management.

Step 3 – Unified intake and document upload

We use one intake questionnaire and one secure document space for all jurisdictions. Information on salary, bonuses, equity compensation, bank accounts, portfolios and real estate is captured once and then allocated internally to the Swiss, US and/or German teams.

Step 4 – Coordinated preparation of returns

The Swiss team prepares income and, where relevant, wealth tax returns at canton level. The US and German teams prepare foreign returns with full visibility of the Swiss figures to manage foreign tax credits, treaty questions and timing differences. We coordinate internally so that positions are consistent across countries.

Step 5 – Joint review and filing

You receive a consolidated summary explaining how income and assets are treated in each jurisdiction and how double taxation is avoided or mitigated. We then proceed with e-filing or submission by post, and can also assist with assessments and follow-up queries from the tax authorities.

Step 6 – Invoicing

Even though the process is integrated, invoices are issued separately by each legal entity (Swiss, US, German). On request, we can align billing in CHF, USD or EUR and provide an overview so that you see the total cost of the engagement at a glance.

Wealth tax is normally handled within the same Swiss engagement. For details, see our Swiss Wealth Tax Service.

Cantonal Swiss income tax service pages

The concrete service packages and indicative fees for Swiss income tax are outlined on canton-specific service pages. Select your canton below to view thresholds, filing paths and our fixed-fee packages.

Canton Income tax service page
Aargau Aargau – Income Tax Service
Appenzell A.Rh. Appenzell Ausserrhoden – Income Tax Service
Appenzell I.Rh. Appenzell Innerrhoden – Income Tax Service
Basel-Landschaft Basel-Landschaft – Income Tax Service
Basel-Stadt Basel-Stadt – Income Tax Service
Bern Bern – Income Tax Service
Freiburg Freiburg – Income Tax Service
Geneva Geneva – Income Tax Service
Glarus Glarus – Income Tax Service
Graubünden Grisons – Income Tax Service
Jura Jura – Income Tax Service
Lucerne Lucerne – Income Tax Service
Neuchâtel Neuchâtel – Income Tax Service
Nidwalden Nidwalden – Income Tax Service
Obwalden Obwalden – Income Tax Service
Schaffhausen Schaffhausen – Income Tax Service
Schwyz Schwyz – Income Tax Service
Solothurn Solothurn – Income Tax Service
St. Gallen St. Gallen – Income Tax Service
Thurgau Thurgau – Income Tax Service
Ticino Ticino – Income Tax Service
Uri Uri – Income Tax Service
Valais Valais – Income Tax Service
Vaud Vaud – Income Tax Service
Zug Zug – Income Tax Service
Zürich Zürich – Income Tax Service

If your canton page is not yet live, we can still provide full Swiss income tax support – the page will be added over time, but the underlying service is already available.

Talk to a Swiss cross-border income tax specialist

In a complimentary 20-minute discovery call, we clarify your residency, cantons involved and cross-border links, and outline the appropriate canton-specific service package for your Swiss income and wealth tax filings.

Book your free consult