Cst Causa

What Cst Causa does

Cst Causa (legal entity: cSt causa Steuerberatungs GmbH) is an Austrian boutique tax advisory and business consulting firm headquartered at Börsegasse 12/1 in Vienna's 1st district. Founded in 2006 by Claudia Stadler as a spin-off from PwC, the firm operates as an interdisciplinary group of related entities — cSt causa Steuerberatungs GmbH (tax), cSt Unternehmensberatung und Lohnverrechnungs GmbH (consulting/payroll), cSt Lohnverrechnungs.at GmbH (payroll), and cSt viso Steuerberatungs GmbH (Austrian SMEs and one-person companies) — delivering tax advisory, bookkeeping and financial statement preparation, payroll, business consulting (including restructuring and due diligence), and court-registered mediation services. The firm serves a heterogeneous client base spanning Austrian SMEs (primary segment), international corporate groups requiring cross-border tax work, non-profit organizations, educational institutions, and private individuals including freelancers and high-net-worth clients.

The firm operates a relationship-driven, sales-led go-to-market model with no proprietary technology platform, APIs, or software products. Revenue is generated through professional advisory fees billed on per-engagement or retainer terms; no tiered pricing is publicly disclosed. Distribution is direct and partner-led, supplemented by a network of co-operation partners (legal, auditing, IT, executive search) and the INPACT Global international tax network. The firm describes itself as "österreichweit tätig" (active across Austria) and supports German, English, Hungarian, and Russian-language client interactions, indicating a Central/Eastern European cross-border orientation. No external funding rounds, M&A activity, or AI/ML capabilities are evident in the input.

The firm's competitive position is anchored on partner expertise (PwC/EY heritage, certified mediator and supervisory board credentials), deep institutional knowledge built through long lifecycle client engagements (incorporation through exit), and a one-stop-shop interdisciplinary model. Marketing is executed through a quarterly client magazine ("Impuls"), a tax-tips blog, professional social channels, and Claudia Stadler's personal brand columns in industry press (Sheconomy, Österreich). Headcount is reported at 1–10 in current firmographics (versus ~31 employees as of a 2018 interview), indicating either a contraction or a discrepancy in available snapshots.

Name

Cst Causa

Legal name

cSt causa Steuerberatungs GmbH

Website

https://cst-causa.at

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

1–10 employees

Short description

Cst Causa is a Vienna-based boutique tax advisory and business consulting firm founded in 2006, offering tax, bookkeeping, payroll, consulting, and mediation services to Austrian SMEs, international groups, non-profits, and private clients through a relationship-driven, partner-led model.

Ownership category

akta.pro rank

Product category

Tax Advisory & Business Consulting

NAICS

Offices of Certified Public Accountants (541211), Trusts, Estates, and Agency Accounts (52592)

SIC

Services-Management Services (8741)

akta.pro primary industry

Estate Administration & Probate Services (FSAAANAE)

Keywords

• Tax advisory services
• Business consulting
• Bookkeeping services
• Payroll accounting
• Mediation services

Headquarters

HQ city

Vienna

HQ country

Austria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Others

Revenue model

1. Tax Advisory and Consulting Services: cSt causa generates revenue through professional advisory and consulting fees for tax planning, business consulting, bookkeeping, payroll processing, and mediation services. The firm offers a one-stop-shop model covering the full business lifecycle from incorporation to disposal, with ongoing retainer-based client relationships.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

cSt causa is a Vienna-based Austrian tax advisory and business consulting firm offering a one-stop-shop service portfolio covering payroll accounting, bookkeeping and financial statements, tax consulting (corporate, personal, VAT, succession, cross-border), business consulting (start-up support, restructuring, due diligence), and certified mediation services. The firm supports clients from company incorporation through to disposal/exit, handling authority communications and bureaucratic tasks on their behalf.

Product overview

Cst Causa is a traditional tax and business consulting firm offering professional advisory services, not a software product company. The company provides a unified suite of professional services including Payroll Accounting, Book-keeping & Accounting, Tax Consulting, Business Consulting, and Mediation. These services are delivered as consultative offerings rather than software products or modules, providing clients with comprehensive support from business establishment through ongoing operations and strategic development.

Differentiator

Problem solved

Functional benefit

Products and services

• Payroll Accounting (Personalverrechnung)

Quantifiable outcome

• Clients are accompanied throughout the entire business year, enabling them to focus on strategic business development without administrative distractions.

Named customers5 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Twelve partnerships are on record, tiered core and minor.

• Kojnek & Partner Wirtschaftsprüfungs- und Steuerberatungsgesellschaft mbHcoreStrategic or Co-development PartnerKojnek & Partner is a co-operation partner firm led by managing shareholder Klaus Kojnek. Based in Oberwart, the firm specializes in auditing, tax advisory, and restructuring services, and works in close coordination with cSt causa on client engagements in the Burgenland region of Austria.
• Kronos Advisory GmbHminorStrategic or Co-development PartnerManagement consulting partner represented by Sven Rischko and Mag. Charles J.F. van Erp, offering management advisory services that complement cSt causa's business consulting offerings.
• Karl Koch ConsultingminorImplementation/ SI/ Consulting PartnerPartner for management, reorganization, and organizational development consulting services.
• Consultatio Tax Consultancy & AuditingminorStrategic or Co-development PartnerTax consultancy and auditing firm serving as a cooperation partner for specialized tax and audit engagements.
• Dr. Sabine FischerminorOthersIndividual professional partner offering specialized consulting services.
• Marie-Theres Euler-RolleminorOthersIndividual professional partner referenced on the firm's links page.
• Max SeibaldminorOthersProfessional partner (Vienna artists' copyright association - Bildrecht) referenced on the firm's links page.
• Mag. Christian GraslminorOthersLegal and rights consulting partner (Rechtsconsulting) listed as a cooperation partner.
• Dr. Georg Greindl / Dr. Bettina KöckminorOthersLegal partnership firm (Greindl & Köck) listed as a cooperation partner.
• Doris Hofmeister, Mercuri-Urval AustriaminorStrategic or Co-development PartnerExecutive search and HR consulting partner. cSt causa co-organized a Tax Talk event with Mercuri-Urval featuring Claudia Stadler.
• Manuela Mätzener, Institute for Families and Businesses (ifub.at)minorStrategic or Co-development PartnerPartner specializing in family business consulting, complementing cSt causa's succession planning and family business advisory services.
• INPACT Global NetworkcoreStrategic or Co-development PartnerInternational network of tax experts that cSt causa participates in. The team attended the INPACT Global Conference 2019 in Luxembourg, which focused on European tax law developments.

Scale indicators3 records

Recent moves10 records

Expansion highlights5 records

Broad incumbents

• EY (Ernst & Young) Austria: Austrian arm of the Big Four, where Claudia Stadler also held prior senior roles. Comparable tax, audit, and advisory offerings at much larger scale — key competitor for enterprise mandates and a source of senior talent.
• PwC Austria: Austrian arm of the Big Four and the former employer of cSt causa founder Claudia Stadler. Directly comparable service lines but at enterprise scale; relevant as both competitor for talent and as the firm whose DNA cSt causa is built on.
• KPMG Austria: Austrian arm of the Big Four, offering tax, audit, and advisory services. Broadly comparable service portfolio but at enterprise scale, competing for the same multinational and large Austrian clients that cSt causa also targets via INPACT.
• Deloitte Austria: Austrian arm of the Big Four accounting and consulting firm. Broadly comparable in service offerings (tax, audit, consulting) but operates at significantly larger scale with full multinational capability — represents both a competitor and a potential client destination for outgrowing cSt causa clients.

Direct peers

• TPA Steuerberatung (Treuhand Partner Austria): A leading Austrian tax advisory and audit firm with strong SME focus. Directly comparable to cSt causa in service mix (tax, accounting, payroll, consulting), Austrian geography, and boutique-to-mid-market positioning.
• BDO Austria: Austrian member of the BDO global accounting network. Closely comparable to cSt causa on the SME/mid-market tax and consulting side, but larger and with deeper international audit capability.
• Grant Thornton Austria: Mid-tier international accounting and advisory firm with Austrian operations. Comparable service mix (tax, audit, advisory) for SMEs and mid-market clients, similar boutique-to-mid-market positioning, but with global reach cSt causa lacks.
• LeitnerLeitner Steuerberatung: Austrian tax and consulting firm with strong cross-border and family-business expertise. Comparable to cSt causa in combining tax advisory, business consulting, and SME/international client focus across Austria and CEE.
• RSM Austria: Austrian member of the RSM global accounting network, focused on mid-market tax and advisory. Comparable to cSt causa on SME and mid-market engagements, with cross-border delivery through the international RSM network.
• LBG Österreich: One of Austria's largest domestic tax consulting cooperatives with broad SME and individual client coverage. Directly comparable to cSt causa across core tax, bookkeeping, and payroll services for the Austrian SME market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/cSt.causa.Steuerberatung
• LinkedInlinkedin.com/company/cst-causa-steuerberatung
• Xx.com/cSt_causa

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Cst Causa