Concept Renkes & Partner

What Concept Renkes & Partner does

Concept Renkes & Partner mbB Steuerberatungsgesellschaft is a German tax consulting and auditing partnership headquartered in Mainz-Gonsenheim (Am Sägewerk 13), with roots tracing to Werner Renkes' 1980 individual practice and reorganized into its current mbB form in 1988. Following a 2025 structural split, tax consulting remains in the mbB while auditing was moved into a newly founded wholly-owned subsidiary, Concept Wirtschaftsprüfung GmbH. The firm operates with three active partners (Volker Hummel, Bettina Harms, Jan Saulheimer), seven salaried tax advisors, and roughly forty additional staff including an in-house IT specialist, serving a primarily Mittelstand client base of medium-sized companies across all legal forms, with additional exposure to family-owned businesses requiring succession support and to internationally active clients requiring inbound/outbound tax structuring.

The core offering is a full-service tax and business advisory portfolio: tax return preparation, annual financial statements, monthly financial and payroll accounting, audit support, corporate succession consulting, business valuation, and international tax law advisory, complemented by digitalization consulting delivered through the DATEV ecosystem (DATEV Unternehmen Online, DATEV Meine Steuern, and remote support modules) plus custom interfaces between inventory, HR, time-tracking, and document management systems. The firm was recognized as a DATEV 'Digitale Kanzlei 2025' and operates multi-lingual service delivery in German, English, and French, with geographic reach spanning Mainz, the Rhine-Main region, and nationwide clients, supplemented by foreign colleague networks for cross-border engagements.

The business model is a traditional consultative professional services model: revenue is generated per engagement under fee structures governed by the Steuerberatervergütungsverordnung (StBVV) for tax work, with pricing scoped to engagement complexity rather than publicly disclosed. New client acquisition is driven by a free initial consultation, long-term relationship development with designated contact persons, referral-based growth from the existing client base, and modest digital channels (bilingual website, Instagram, XING, plus a dual-study cooperation with Hochschule Mainz for talent). The firm has historically supplemented organic client growth with acquisitions of smaller tax practices (Kanzleizukäufe). There is no external investor, parent company, or public funding — ownership and control rest entirely with the active partners.

Name

Concept Renkes & Partner

Legal name

Concept Renkes & Partner mbB Steuerberatungsgesellschaft

Website

https://concept-tax.de

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

11–50 employees

Short description

Concept Renkes & Partner mbB is a Mainz-based German tax consulting and auditing partnership serving medium-sized Mittelstand companies, family-owned businesses, and internationally active clients with full-service tax, financial accounting, payroll, audit, succession, and international tax advisory delivered through the DATEV ecosystem.

Ownership category

akta.pro rank

Headquarters

HQ city

Mainz

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Tax Consulting Services: Core tax advisory services including tax return preparation, tax planning, and representation before tax authorities. Revenue generated through professional service fees typically based on scope and complexity of engagements.
2. Financial Statement Preparation: Preparation of annual financial statements and Einnahmen-Überschuss-Rechnungen for companies of all legal forms. Core service offering for medium-sized client base.
3. Payroll and Financial Accounting: Monthly payroll processing and financial accounting services. Includes certification and reporting processes and company audit support.
4. Auditing Services: Audit services through the associated auditing company Concept Wirtschaftsprüfung GmbH, established in 2025 as part of the firm split.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Concept Renkes & Partner mbB is a German tax consulting and auditing partnership providing comprehensive professional services to medium-sized companies of all legal forms. Its core offerings include tax advisory (return preparation, tax planning, representation before tax authorities), auditing (through the associated Concept Wirtschaftsprüfung GmbH), financial accounting, payroll accounting, annual financial statements and Einnahmen-Überschuss-Rechnungen, company founding and acquisition advisory, corporate succession planning, and international tax law advisory for inbound and outbound cases. All service delivery is built on the DATEV software ecosystem with cloud-based document exchange, custom interface configuration, and remote client support capabilities.

Product overview

Concept Renkes & Partner is a tax consulting and auditing firm (Steuerberatungsgesellschaft) offering a unified professional services portfolio. The core offering comprises tax consulting and auditing services, supported by specialized service modules including financial accounting, payroll accounting, annual financial statements, and tax return preparation—all delivered through the DATEV ecosystem with digitalization consulting provided by an in-house IT specialist. The firm also provides specialized services in corporate succession and international tax law.

Differentiator

Problem solved

Functional benefit

Products and services

• Tax Consulting Services (Steuerberatung) Comprehensive tax advisory for medium-sized companies covering tax return preparation, tax planning, and representation before tax authorities; offered as part of the firm's unified professional services portfolio.
• Auditing Services (Wirtschaftsprüfung) Statutory and voluntary audit services for companies of all legal forms, delivered through the associated Concept Wirtschaftsprüfung GmbH auditing company established in 2025.
• Financial Accounting (Finanzbuchhaltung) Preparation of ongoing financial accounting including fully electronic accounting methods, integrated with DATEV software for companies of all sizes.
• Payroll Accounting (Lohnbuchhaltung) Comprehensive payroll processing delivered by a dedicated specialist team, including certification and reporting procedures and advisory support for client-internal personnel administration, suited to companies with larger workforces.
• Annual Financial Statements (Jahresabschlüsse) Preparation of annual financial statements and Einnahmen-Überschuss-Rechnungen (revenue-excess-expenditure calculations) for companies of all legal forms.
• Tax Return Preparation (Steuererklärungen) Preparation of corporate and private tax returns, review of tax assessments, and filing of appeals.
• Corporate Succession Consulting (Unternehmensnachfolge) Advisory services for structuring business succession, including initial company valuation (Unternehmenswertschätzung) and full business valuation (Unternehmensbewertung), and preparation of company sales.
• International Tax Law (Internationales Steuerrecht) International tax advisory for outbound and inbound cases, including optimal tax structuring of domestic branches, VAT registration, and establishment of domestic subsidiaries, plus cross-border income and inheritance taxation questions.
• Digitalization Consulting (Digitalisierung) IT specialist services for client digital transformation covering needs analysis, software setup, configuration of tailored interfaces between inventory, personnel, time tracking, and document management systems into DATEV, and end-user training.

Quantifiable outcome

• Digital document exchange enables location-independent client support with permanent access to receipts and documents
• +1 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature3 records

Partnerships

One partnership is on record.

• DATEV eGcoreTechnology or IntegrationStrategic technology partnership with DATEV for accounting, tax, and payroll software. Firm is recognized as a 'Digitale Kanzlei 2025' (Digital Tax Firm 2025). Uses DATEV Unternehmen Online for client document exchange, DATEV Meine Steuern for income tax clients, and provides DATEV remote support modules to clients. IT specialist has extensive DATEV expertise with focus on DATEV Unternehmen Online, payroll and financial accounting interfaces, document management systems, and procedural documentation.

Scale indicators4 records

Recent moves10 records

Expansion highlights5 records

Broad incumbents

• BDO Germany: Global accounting network's German member firm offering full-service tax, audit and advisory. Broader scope and larger scale than Concept, but overlaps directly on Mittelstand audit, tax compliance and international tax work.
• Mazars Germany: International accounting firm's German practice offering tax, audit and advisory to mid-market and larger clients. Overlaps with Concept on German Mittelstand tax compliance and corporate succession.
• RSM Germany: Global audit network's German member serving mid-market companies with tax, audit and consulting. Comparable on client tier and integrated service delivery, though at larger scale.

Direct peers

• Ebner Stolz: German mid-market advisory firm offering tax, audit, legal and consulting to Mittelstand companies. Comparable on client profile, integrated service model, and regional German footprint with international capabilities.
• Rödl & Partner: German-origin international professional services firm with strong Mittelstand focus and integrated tax/legal/audit practice. Closely comparable on cross-border tax advisory for German SMEs and family-owned businesses.
• dhpg: German mid-market tax, audit, legal and consulting firm serving family-owned and Mittelstand clients. Directly comparable on client segment, service breadth, and corporate succession advisory.
• ETL Steuerberatung: Germany's largest tax consulting franchise network serving Mittelstand with similar full-service tax, payroll and audit offerings. Most directly comparable on business model, client segment, and DATEV-based technology stack.
• LKC Steuerberatung: German tax and audit firm with focus on medium-sized enterprises and family businesses. Comparable on service mix (tax, audit, succession) and Mittelstand client base.
• PKF Fasselt Schäfer: Part of the international PKF network, German tax/audit firm focused on mid-market companies. Comparable on client profile and DATEV-anchored service delivery.

Others

• DATEV eG: German tax-software cooperative providing the DATEV ecosystem that Concept's entire digital service delivery depends on. Not a competitor but the critical infrastructure partner that shapes the firm's operating model and Digitale Kanzlei positioning.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights5 records

Customer concentration

• LinkedInlinkedin.com/company/concept-renkes-&-partner
• Instagraminstagram.com/concept_tax

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries1 record

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 Concept Renkes & Partner