Company lists · Data refreshed September 2026
Top 25 Nonprofit tax compliance firms based in Spain
RevenueBase identified 264 nonprofit tax compliance firms headquartered in Spain as of September 2026 and tracks 1,234 professional contacts across them, including 117 with verified work emails. Madrid is the largest hub.
This list covers nonprofit tax compliance firms headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest nonprofit tax compliance firms based in Spain
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 36 contacts → | ||||
Partial evidence “Asesoría Unidad was established in 1973 to meet the demand for accounting, tax, and legal advisory services.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 35 contacts → | ||||
Indirect evidence “QualityConta es una compañía de profesionales del derecho y la economía, fundada en 1987, que ofrece un servicio integral de consultoría, asesoramiento y gestión a empresas y…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 35 contacts → | ||||
Indirect evidence “GRUPO DE AUDITORES PÚBLICOS es el resultado de la unión de diferentes profesionales con el objetivo de proporcionar un servicio uniforme y de alto valor añadido en los sectores de…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 34 contacts → | ||||
Indirect evidence “ABA Consultores y Auditores de Cuentas se constituye para asesorar y representar a nuestros clientes, con la mayor eficiencia y agilidad en las áreas de Auditoría de Cuentas…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 32 contacts → | ||||
Indirect evidence “GRUPO FIDELIS: ASESORAMIENTO, CONSULTORÍA Y AUDITORÍA INTEGRAL "Hacemos posible una forma diferente de gestionar empresas, ofreciendo servicios profesionales que permiten un…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 29 contacts → | ||||
Indirect evidence “pleta auditores es una firma nacional que ofrece a la empresa privada y pública servicios de auditoría y consultoría.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 27 contacts → | ||||
Indirect evidence “Auditores y Consultores del Sur, S.L.P.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 23 contacts → | ||||
Indirect evidence “We are a business group with over 50 years of experience, dedicated to provide comprehensive consulting services, consulting and management for small and medium enterprises (SMEs).” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 14 contacts → | ||||
Indirect evidence “Asesoramiento empresarial en general, jurídico, tributario, auditoría, laboral y económico financiera, todo estos servicios son realizados por profesionales con alta cualificación…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 11 contacts → | ||||
Indirect evidence “Assemsa ofrece servicio de asesoramiento integral: Asesoría Laboral, Asesoría Contable, Asesoría Fiscal, Asesoría Jurídica, Asesoría Mercantil.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 10 contacts → | ||||
Indirect evidence “DDC Consulting, un equipo de profesionales dedicados a dar servicio integral a empresas con el mejor respaldo; el conocimiento y la experiencia adquiridos durante años y el…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 10 contacts → | ||||
Indirect evidence “IGLEVA es un despacho profesional que ofrece asesoramiento a empresas en materia contable, fiscal, económica, financiera, jurídica y en auditoria interna a PYMES.Nuestra…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 9 contacts → | ||||
Indirect evidence “Asesoría de empresas en las áreas laboral, fiscal, contable, jurídica, consultoría y financiero.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 9 contacts → | ||||
Indirect evidence “Descubre nuestros servicios especializados para empresas y autónomos Asesoría Fiscal y Tributaria Asesoramiento fiscal integral para empresas y autónomos.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 9 contacts → | ||||
Partial evidence “Management consulting; financial, taxes and accounting.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 8 contacts → | ||||
Indirect evidence “Consultora de sociedades mercantiles, autónomos y profesionales, con más de treinta años de experiencia en el asesoramiento y un reconocido prestigio gracias a su trayectoria.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 7 contacts → | ||||
Indirect evidence “Lauders Partners Consulting es una firma especializada en la prestación de servicios profesionales en las áreas de contabilidad, administración y finanzas, fiscalidad y recursos…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 7 contacts → | ||||
Indirect evidence “CENTIUM es una firma multidisciplinar de servicios de auditoría, consultoría y asesoramiento empresarial.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 7 contacts → | ||||
Partial evidence “We advise the company in all fields, that is, commercial, accounting, tax and administrative and management.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 7 contacts → | ||||
Indirect evidence “En BISCAY CONSULTING tenemos como prioridad reportar a las corporaciones ese mix tan difícil: • CALIDAD a través del conocimiento de la normativa, • RIGOR TÉCNICO que reporte…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 6 contacts → | ||||
Indirect evidence “Quiénes somos?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 6 contacts → | ||||
Indirect evidence “ASSPE es una empresa dedicada al asesoramiento y consultoría de empresas, entidades y particulares, desde las vertientes contable, tributaria, mercantil, laboral y jurídica.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 5 contacts → | ||||
Indirect evidence “En Far Asesores nuestra meta es conseguir que nuestros clientes puedan dedicarse a lo que saben hacer, delegando en nosotros las áreas y funciones que una empresa necesita para su…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 5 contacts → | ||||
Indirect evidence “Este despacho profesional de asesoría tiene su origen con la implantación en el año 1969 de sus primeras instalaciones en Avilés.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 4 contacts → | ||||
Indirect evidence “Constituida en Lorca, SALMA, Asesoramiento Integral (SALMA ASESORES S.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: nonprofit tax compliance firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names nonprofit tax compliance firms.
- Partial evidence
- Its own public description names part of nonprofit tax compliance firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name nonprofit tax compliance firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 264 nonprofit tax compliance firms based in Spain
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Nonprofit tax compliance firms based in Spain at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 264 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among nonprofit tax compliance firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Spain whose own description of what they do matches “nonprofit tax compliance firms”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names nonprofit tax compliance firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among nonprofit tax compliance firms, and records with no verified work email. Companies headquartered outside Spain are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 117 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Nonprofit tax compliance firms by metro
- Nonprofit tax compliance firms in Madrid51
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names nonprofit tax compliance firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many nonprofit tax compliance firms are there based in Spain?
RevenueBase identified 264 nonprofit tax compliance firms headquartered in Spain as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Asesoría Unidad, headquartered in Santa Eularia Des Riu, tops this list with the largest team on record.
Which city has the most nonprofit tax compliance firms?
Madrid leads with 51 headquartered companies, followed by Barcelona (17) and Malaga (16).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 117 verified decision-maker contacts tracked across these 264 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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