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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryFinance & InsuranceFiduciary OfficesRomanshornSidler Treuhand AG
Sidler Treuhand AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of Sidler Treuhand AG is to provide comprehensive services in the following areas: * Consulting and support for companies and private individuals in business management matters * Accounting, including bookkeeping and financial and accounting services * Tax matters, including tax planning, tax returns and representation before authorities * Personnel administration, including payroll processing and personnel recruitment * Audits, including financial statement audits and reporting * Asset management, including real estate and asset management The company positions itself as a generalist and offers its customers a comprehensive range of services to meet their business management, tax and financial needs.

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Offering

Products & services

Industry:Fiduciary Offices
✓ Offered
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Sidler Treuhand AG

11
Business management consulting
Decision support and bases for making choices on financial, commercial and personnel matters, from company formation to succession arrangements.
Accounting
Organisation, management and closing of bookkeeping, as well as partial or complete relief in finance and accounting.
Tax advisory
Tax planning, tax returns, representation before authorities, as well as objections and appeals against decisions of the tax authorities.
HR administration
Processing payroll data, preparing wage certificates and payroll reports for AHV, SUVA and BVG, as well as personnel recruitment.
Audits
Statutory audit mandates, financial statement audits, reporting, expert assessments and analyses.
Estate divisions and execution of wills
Carrying out estate divisions and execution of wills within the scope of supplementary fiduciary services.
Real estate and asset management
Management of real estate and assets as a supplementary or support fiduciary service.
IT consulting and services
Consulting and services in the IT sector as supplementary support for mandates and projects.
Project handling
Handling of projects as a supporting service for business and private clients.
Marketing support
Support with marketing activities within the framework of supplementary fiduciary and consulting services.
Arrangement of financing
Arrangement of financing as a supporting service.
Trust & reputation

ranQ Trust Score of Sidler Treuhand AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Sidler Treuhand AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Sidler Treuhand AG scores 85.5 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Sidler Treuhand AG scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).83.322%
Sidler Treuhand AG scores 0.3 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.0.34%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sidler Treuhand AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

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Location

Alleestrasse 20
8590 Romanshorn

At a glance

Legal form
Corporation
UID
CHE-107.098.443
Founded
1991 · 35 years
Last commercial register change
July 3, 2018
Employees
1 to 10
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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