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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryFinance & InsuranceFiduciary OfficesBaselTestor Treuhand AG
Testor Treuhand AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The company provides comprehensive services in the areas of corporate consulting, tax consulting, trust, accounting, personnel administration, property management and auditing. The core activity of the company is to support companies and private individuals in managing and controlling their financial and legal affairs. This includes, among other things, the preparation of tax returns, the conduct of due diligence reviews, the management of accounting and personnel administration, as well as the creation of financial and liquidity plans.

AI-generated
Offering

Products & services

Industry:Fiduciary Offices
✓ Offered8
Financial auditing
Financial audits for annual and group financial statements, limited and ordinary audits under Swiss accounting law and Swiss GAAP FER, including audits of pension institutions, special audits and voluntary audits.
Tax consulting
Tax consulting from simple tax returns to complex restructurings, including comprehensive and qualified tax advice, tax rulings and support for assessment procedures.
Business consulting
Business consulting for company formations, reorganisations, mergers, demergers, restructurings, succession planning and liquidations, as well as for organisation, internal control systems (ICS), group structures and management.
Fiduciary services
Fiduciary services for accounting, personnel administration, property management and private matters, including bookkeeping, payroll accounting, VAT reporting and administrative tasks.
Accounting
Bookkeeping internally or on site, general and subsidiary ledgers, VAT reporting, annual and interim financial statements, consolidations, budgeting, reporting and cash-flow planning.
Personnel administration
Payroll accounting, payslips and salary statements, social security and withholding tax reporting, employer controls, employment contract consulting and permits.
Property management
Management and letting of properties, property accounting, rent and heating cost statements, as well as support for tenants, tradespeople and authorities.
Private individuals
Guidance for private individuals and families in executorships, inheritance divisions, advance directives/mandates for personal care and support, as well as in communities of heirs and co-ownership inheritance arrangements.
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4.1/5

Testor Treuhand AG

Trust & reputation

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

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

Testor 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%
Testor Treuhand AG scores 89.3 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.70.07%
Testor Treuhand AG scores 85.0 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).85.022%
Testor Treuhand AG scores 51.4 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 35.51.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Testor 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

Holbeinstrasse 48
4051 Basel
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-102.155.312
Founded
2005 · 21 years
Last commercial register change
July 14, 2026
Employees
11 to 20
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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