Stielstra & Partners

What Stielstra & Partners does

Stielstra & Partners B.V. is a privately held Dutch full-service accounting and advisory firm headquartered in Rijswijk with a secondary location in Wassenaar, serving the Den Haag region. The firm provides integrated professional services to MKB (small and medium-sized enterprises), ZZP self-employed clients, and DGA (director-major shareholder) holdings, with offerings spanning financial statement compilation, review and audit, tax advisory and filing, payroll administration, HR support, estate and business succession planning, due diligence, financial advisory, and statutory audits for guardianship/custodianship. The team of approximately 15 persons includes six accountants (AA), two tax advisors (RB), three Register Estate Planners, and one business economist; Sjoerd J. Stielstra (partner since 1992) and Carolien M. Brouwer-van Houdt (partner since 1999), both formerly of Deloitte, lead the firm.

The practice generates revenue through fee-for-service billing for compliance and advisory engagements. Its go-to-market is sales-led and relationship-driven: each client is supported by two contact persons at management level, and client tenure averages more than 8 years across a base of over 700 clients, with the longest relationship exceeding 30 years. Service delivery combines face-to-face consultations with online salary (HRSG) and tax (Nextens) client portals, supported by a free e-magazine ("Goed om te weten") and website news content for top-of-funnel demand generation.

The firm operates with no proprietary technology platform; its underlying technology stack comprises third-party accounting software packages and the two SaaS portals. In 2024, Stielstra & Partners entered a partnership with ETL Nederland, a national accounting and advisory network that provides continuity support, complex (international) advisory, audit, legal services, corporate finance capability, and successor-partner financing — establishing ETL as the strategic parent. The firm also maintains affiliations with Extendum for specialist training and Horus (BPBI) for guardianship/curatorship audit work.

Name

Stielstra & Partners

Legal name

Stielstra & Partners B.V.

Website

https://stielstra-partners.nl

Company type

Private

Founded year

1970

Operating status

Operating

Headcount range

1–10 employees

Short description

Stielstra & Partners is a Dutch full-service accounting and advisory firm in Rijswijk/Wassenaar serving more than 700 MKB, ZZP, and DGA clients in the Den Haag region with accounting, tax, payroll, HR, estate planning, and financial advisory services.

Ownership category

akta.pro rank

Product category

Accounting and Advisory Services

NAICS

Offices of Certified Public Accountants (541211), Accounting, Tax Preparation, Bookkeeping, and Payroll Services (54121), Trusts, Estates, and Agency Accounts (52592)

SIC

Investment Advice (6282)

akta.pro primary industry

Estate & Legacy Planning Advisory (FSAEAAAG)

akta.pro secondary industries

Family Business & Succession Advisory (FSAAADAL), Estate Planning & Trust Structuring Advisory (FSAEAKAC), Employer Retirement Plan Advisory (401(k)/Pension) (FSAEABAE)

Keywords

• Accounting services
• Tax advisory
• Payroll administration
• Estate planning
• Financial advisory

Headquarters

HQ city

Rijswijk

HQ country

Netherlands

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services - Accounting and Advisory Fees: Revenue generated through fees for accounting services (compiling, reviewing, auditing annual accounts), tax advisory and filing services, payroll administration, estate planning, financial advisory, and other professional services provided to MKB clients.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Stielstra & Partners B.V. is a full-service Dutch accountancy and advisory firm delivering accounting, tax, payroll, HR, estate planning, and financial advisory services to MKB (SMB) clients in the Den Haag region from offices in Rijswijk and Wassenaar. Services include annual accounts compilation, review and audit, tax return preparation, monthly payroll processing, estate and succession planning, and advisory on financing, restructuring, and shareholder disputes, supported by AA accountants, RB tax advisors, and Register Estate Planners.

Product overview

Stielstra & Partners is a full-service accounting and advisory firm providing integrated professional services. The firm offers a comprehensive portfolio of services including accounting and audit (jaarrekening samenstelling, controle, beoordeling), tax advisory and preparation (fiscaal), payroll administration (salarisadministratie), HR services, estate planning (bedrijfsoverdracht, testament, pensioen), and financial advisory (financieringen, herstructureringen). Services are delivered by a team of AA-accountants, Register Belastingadviseurs, and Register Estate Planners across offices in Rijswijk and Wassenaar.

Differentiator

Problem solved

Functional benefit

Products and services

• Accountantsdiensten (Accounting Services) Comprehensive accounting services for Dutch SMBs including compilation, review and audit of annual financial statements, plus administrative organization and internal control support.

Quantifiable outcome

• 700+ clients served with an average tenure of more than 8 years
• +3 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

Partnerships

Four partnerships are on record, tiered core and minor.

• ETL NederlandcoreStrategic or Co-development Partner · 1 January 2024In 2024, Stielstra & Partners entered a partnership with ETL Nederland to ensure continuity of the firm and to support with complex (international) advisory, audit, legal services, and corporate finance. ETL provides support for partnership succession, including financing of successor partners.
• ExtendumminorStrategic or Co-development PartnerStielstra & Partners is affiliated with Extendum, an organization that can bring specialist knowledge to bear on behalf of clients and also provides (internal) training and education.
• Horus (Branchevereniging voor Professionele Bewindvoerders en Inkomensbeheerders / BPBI)minorOthersStielstra & Partners is affiliated with Horus (BPBI), the Branch Association for Professional Guardians, Administrators, and Income Managers. They perform audits for the BPBI organization and are connected to the branch-specific requirements for guardianship and curatorship reporting.
• Paauw & van Duijvenbode bewindvoerdersminorStrategic or Co-development PartnerStielstra & Partners collaborates with Paauw & van Duijvenbode bewindvoerders (court-appointed administrators). They provide administrative support and financial management services for individuals under guardianship, curatorship, or mentorship.

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• ABAB: Dutch accounting and advisory firm (ABN AMRO subsidiary) with strong SME and agricultural client focus. Comparable on full-service MKB accounting, tax, and advisory offerings.
• HLB Witlox Van den Boomen: Dutch MKB-focused accounting and advisory firm with similar service portfolio and SME client base. Comparable on integrated accounting, tax, and advisory services for Dutch mid-market and family-owned businesses.
• Flynth: Large Dutch accounting and advisory firm focused on SMEs, agriculture, and mid-market clients. Directly comparable business model to Stielstra & Partners with broader geographic reach and similar full-service MKB positioning.
• Accon avm: Dutch mid-market accounting, tax, and advisory firm serving ZZP and SME clients. Closely comparable in service mix, client size focus, and integrated accounting/tax/advisory model.
• PKF Wallast: Dutch mid-market accounting, tax, and advisory firm serving entrepreneurial and family businesses. Comparable on integrated professional services for SME clients with similar fee-based model.
• DRV Accountants & Adviseurs: Dutch regional accounting and advisory firm serving SMEs and mid-market clients with accounting, tax, and advisory services. Closely comparable business model and client size focus.

Broad incumbents

• BDO Netherlands: Top 5 Dutch accounting firm with substantial MKB practice serving SME clients across the Netherlands. Comparable on SME service portfolio but operates at much larger scale and brand recognition.
• Baker Tilly Netherlands: Dutch member of the global Baker Tilly network, providing accounting, tax, and advisory to MKB and mid-market. Significantly larger than Stielstra & Partners but operates with similar SME service portfolio.
• ETL Nederland: National Dutch accounting and advisory network of which Stielstra & Partners joined as a partner firm in 2024. Provides direct comparability on MKB-focused services and represents the parent/strategic control structure now in place.
• Mazars Netherlands: Dutch arm of the Mazars international accounting network with MKB and mid-market advisory practices. Comparable on full-service accounting and advisory offerings for Dutch SMEs.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 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 Stielstra & Partners