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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,194 companies indexed · Last updated: today
DirectoryFinance & InsuranceFiduciary OfficesWinterthurSusanna Keller GmbH
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Susanna Keller GmbH

Summary

About the company

The core activity of Susanna Keller GmbH is the needs-based relief in the areas of accounting and trust services, including services such as accounting, budgeting, business planning, start-ups, investment applications, planning accounting, corporate loans and administration. The company also offers training, individual assistance and support in these areas to relieve customers and enable them to have more time for business development and customer care.

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Offering

Products & services

Industry:Fiduciary Offices
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Accounting
Accounting for SMEs and sole proprietors, including software setup, chart of accounts, account coding, document management, social security and VAT questions, as well as training for independent implementation.
Year-end accounts – tax-compliant
Tax-compliant year-end accounts for SMEs and sole proprietors, including closing entries, notes, checklists, corrections and support with the preparation of the tax return.
Taxes: Tax return
Tax return for individuals, sole proprietors and legal entities; tax representation, clarification of deductions, depreciation and conversion topics.
Payroll accounting: Salary administration
Payroll statements for hourly and monthly wages, AHV and withholding tax reporting, BVG and insurance registrations, salary certificates and integration into the accounting.
Value Added Tax (VAT)
VAT registration, invoicing, sales reconciliation, control, representation with the Federal Tax Administration, as well as selecting the billing method and integration into the accounting.
Budgeting – Business plan
Budgeting and business plan for start-up and expansion, including market analysis, documentation for business loans, projected income statement and funding needs for the first years.
New business – Start-up
Advisory for business start-up, choice of legal form, insurance, VAT obligation, accounting software and accounting training for new companies.
Administration
Administrative support for practices and small businesses, including software selection, invoicing, needs assessment, efficient working and accounting.
Interim management: Head of Finance
Interim finance leadership with quarterly and annual financial statements, projected income statement, budgeting and consolidated reporting in the event of the internal finance responsibility being unavailable.
Reviews

Aggregated rating

Aggregated rating
4
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle44
★TrustpilotSoon
PProvenExpertSoon

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Location

Eisweiherstrasse 107
8400 Winterthur
Opening hours
Mon
08:00 - 11:30, 14:00 - 17:00
Tue
08:00 - 11:30, 14:00 - 17:00
Wed
08:00 - 11:30, 14:00 - 17:00
Thu
08:00 - 11:30, 14:00 - 17:00
Fri
08:00 - 11:30, 14:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-295.634.894
Founded
2018 · 8 years
Last commercial register change
May 14, 2018
Employees
11 to 20

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