Choosing the management software for an accounting or professional firm is one of the most long-lasting decisions its manager will ever make. It does not change every year: the learning curve, the migration of historical tax and payroll records, and staff training all carry a real cost. That is why, when the market offers established names such as Aplifisa, a3ASESOR (Wolters Kluwer) and Sage, the comparison deserves rigour, not headlines.
In this article we break down the three options from the angle that matters most to a mid-sized tax, payroll or accounting practice: what each suite covers, how it responds to the regulatory obligations of 2026-2027 (Verifactu, SII, B2B e-invoicing) and which practical criteria tip the balance one way or the other.
The software ecosystem for Spanish firms: context in 2026
The market for software aimed at Spanish advisory firms has been consolidating for years. TeamSystem, the largest Italian group for SME management software, acquired Aplifisa in July 2023, integrating it into an ecosystem that now includes nine acquisitions in Spain since 2021. For its part, Wolters Kluwer maintains a3ASESOR as a historical benchmark with decades of penetration in professional practices, while Sage competes with both its 50 range (accounting and invoicing for SMEs) and Sage 200 for mid-sized companies with greater complexity.
The regulatory backdrop is unavoidable: the Verifactu system — regulated by Royal Decree 1007/2023 and amended by RDL 15/2025 — requires invoicing software to generate verifiable invoicing records. Current deadlines set the entry into force for legal entities on 1 January 2027 and for self-employed persons on 1 July 2027. None of the three manufacturers holds an «AEAT certificate»: the legal mechanism is the manufacturer's declaration of responsibility, as established by RD 1007/2023. This deserves clarification because claims of «approved software» proliferate without any legal basis.
Aplifisa: TeamSystem's bid for the all-in-one practice
Aplifisa was founded in Salamanca in 1983 and has accumulated more than four decades of specialisation in software for advisory firms. With approximately 5,000 client practices and an estimated market share of around 10% in the Spanish advisory software segment, its catalogue covers the complete practice cycle:
- Tax Suite: Income Tax, Corporation Tax, VAT and other AEAT tax models.
- Payroll Suite: payroll processing, Social Security, SEPE models and contract management.
- Accounting with SII: direct link to the Immediate Supply of Information system for practices with clients required to use it (turnover >€6 M/year).
- FactuGes: invoicing module adapted to Verifactu.
- ApliScan: OCR for digitising client documents.
- Practice Management: case file control, tasks, fee billing and client communication.
- Employee Portal: self-service for the employees of the practice's clients.
- Property Management: specific module for homeowners' associations.
- GDPR Module: compliance management for the General Data Protection Regulation for the practice itself and its clients.
Integration into the TeamSystem group gives Aplifisa a technology roadmap backed by a group with revenue close to €1.15 billion and more than 3.1 million clients. For a practice that wants to ensure long-term support and continuous regulatory updates, that backing is a relevant factor.
If you want to learn more about how Aplifisa works in practice and which firms it suits best, you can consult our Aplifisa implementation and support service, where we detail the go-live process and migration from other systems.
a3ASESOR (Wolters Kluwer): the established benchmark
a3ASESOR is probably the most recognised software in the Spanish tax and payroll advisory market. Wolters Kluwer has developed it for decades and has built a very large installed base, particularly in mid-sized and large practices.
Its usual strengths include permanent regulatory updates (Wolters Kluwer is also a legal publishing house), depth in the tax module (a3ASESOR tax) and integration with other in-house tools (a3nom for payroll, a3con for accounting). The commercialisation model is annual subscription, with prices that vary according to the number of users, managed companies and contracted modules.
Its historical weakness has been the learning curve: the system is powerful but demands specific training. In addition, dependence on a single multinational supplier — with centralised pricing and support policies — can be a risk factor for a smaller practice.
Sage for practices: SME accounting tool or full advisory suite?
Sage 50 (the successor to ContaPlus) and Sage 200 were not originally designed as advisory software: they are accounting and financial management tools for the company itself. Many practices use them to handle the accounting of their business clients one by one, but Sage does not offer a complete tax module at the level of a3ASESOR or Aplifisa (Income Tax, Corporation Tax, integrated periodic models).
Sage is a solid option for the practice that wants to handle the accounting of SME clients with a robust and well-known tool, but it has clear limitations if the practice needs a centralised tax and payroll management system. Sage 200 adds greater power for mid-market ERP, but moves away from the pure advisory practice profile.
Direct comparison: Aplifisa vs a3ASESOR vs Sage
| Criterion | Aplifisa (TeamSystem) | a3ASESOR (Wolters Kluwer) | Sage 50 / 200 |
|---|---|---|---|
| Main orientation | All-in-one professional practice (tax, payroll, accounting) | All-in-one professional practice (tax, payroll, accounting) | Company accounting/ERP (not a pure advisory tool) |
| Complete Tax Suite | Yes (Income Tax, Corporation Tax, VAT, IRPF, models) | Yes (one of the most complete on the market) | Limited; no integrated third-party tax module |
| Payroll Suite | Yes (payroll, SS, SEPE, contracts) | Yes (a3nom) | Partial (Sage HR separate) |
| Accounting with SII | Yes | Yes (a3con) | Yes (Sage 200 advanced) |
| Verifactu-ready | Yes (FactuGes module) | Yes | Yes (confirmed roadmap) |
| OCR / document digitisation | Yes (ApliScan) | Partial (third-party integrations) | Not native |
| Practice management (case files, fees) | Yes (Practice Management module) | Yes (a3ASESOR management) | Not native |
| Property management | Yes (specific module) | Yes (WK-specific module) | No |
| GDPR module | Yes | Partial (via Wolters Kluwer Legal) | No |
| Employee portal | Yes | Yes | Via Sage HR |
| Manufacturer backing | TeamSystem (~€1.15 bn group revenue) | Wolters Kluwer (multinational publisher and software group) | Sage Group (UK multinational) |
| Indicative price | Annual subscription by modules and users (on request) | Annual subscription by modules and users (on request) | From ~€300-800/year Sage 50; Sage 200 bespoke |
Note: prices are indicative and may vary depending on configuration, number of users and current promotions. Contact the distributor for a quote tailored to your practice.
Verifactu and e-invoicing: what it means for your software in 2026-2027
Regulatory pressure is the factor that shortens decision timelines for many practices. The two key dates are:
- 1 January 2027: Verifactu mandatory for legal entities (companies).
- 1 July 2027: Verifactu mandatory for self-employed persons.
The SII (Immediate Supply of Information) is already active for companies with annual turnover above €6 million, and is mutually exclusive with Verifactu: those already on SII do not need Verifactu for those transactions.
What is important to clarify: no software obtains «approval» or «certification» from the AEAT. The legal mechanism established by RD 1007/2023 is the manufacturer's declaration of responsibility. If someone sells you software claiming it is «certified by the AEAT», there is no regulatory basis for that claim. All three manufacturers analysed — Aplifisa, Wolters Kluwer and Sage — present their products as adapted to the technical requirements of Verifactu through this declaration of responsibility.
For a practice, adapting to Verifactu is not only a matter of its own software: it also means ensuring that the clients who issue invoices using third-party software are covered. Aplifisa, through its FactuGes module, allows the practice to manage client invoicing with Verifactu compliance from within the suite itself.
The practical criteria that drive the decision
Size and profile of the practice
A practice with fewer than five staff handling mainly income tax returns and basic accounting can work with any of the three options. When a practice exceeds ten employees, manages payroll, handles property management and needs its own employee portal, the integrated suite of Aplifisa or a3ASESOR makes a significant difference compared to Sage, which is not designed for that purpose.
Integration with other tools in the group
If the practice already uses other solutions from the TeamSystem ecosystem — such as Factusol or Contasol for clients who manage their own invoicing — the consistency of data and native integration are a strong argument for Aplifisa. Similarly, those already working with Wolters Kluwer applications will find synergies in a3ASESOR.
Local support and training
This is one of the factors that practice managers most underestimate when comparing software. First-level telephone support with hours-long waiting times, or a ticket service that takes days to respond, can bring operations to a halt in the middle of the income tax campaign. Working with a specialist Aplifisa partner — providing implementation, training and ongoing support — dramatically reduces that risk compared to contracting directly with the manufacturer without local backing.
Total lifecycle cost
Catalogue figures do not tell the whole story. The real cost includes: licences or subscription, initial training, migration of historical data (especially tax returns and payroll records from previous years), the cost of switching if a future migration is decided upon, and the cost of support not included in the base subscription. Before signing, always ask for a three-year total cost estimate.
The role of the specialist partner: why it matters
None of these three manufacturers sells directly to all of its clients: they work through a network of partners and distributors who handle implementation, training and first-level support. The quality of the partner is, in many cases, more decisive for the practice's experience than the software itself.
At Summum Sistemas we have been supporting professional practices, advisory firms and SMEs since 2007 in the selection, implementation and migration of management software. We are an Official TeamSystem Partner for the group's solutions in Spain, which allows us to implement, migrate and support Aplifisa and the rest of the ecosystem (Factusol, Contasol, Nominasol, Billin, Distrito K) with direct product knowledge and access to up-to-date technical training.
That means when a practice chooses us to implement Aplifisa, it does not start from scratch: we transfer the accumulated experience of more than 2,000 digitalisation projects and avoid the most common mistakes in tax configuration, historical data migration and integration with AEAT systems.
Frequently asked questions
Does Aplifisa match a3ASESOR in functionality?
For the majority of mid-sized tax and payroll practices, Aplifisa covers the same areas as a3ASESOR: tax (Income Tax, Corporation Tax, VAT), payroll (Social Security, SEPE), accounting with SII and practice management. The differences lie in interface, workflow and the integrated ecosystem. A practice that has used a3ASESOR for many years will face a migration curve, but will not lose coverage of any regulatory obligation by switching to Aplifisa. The key is to plan the transition carefully and have support during the first few months.
Is Sage valid for an advisory firm that handles client accounting?
Sage 50 and Sage 200 are accounting and financial management tools for companies, not suites designed for advisory firms that file tax models on behalf of third parties. They can work well for a practice focused exclusively on company accounting, but if the practice also handles income tax returns, corporation tax, payroll or property management, it will need additional modules or systems that Sage does not provide in an integrated way. In that case, Aplifisa or a3ASESOR are more complete options.
When does software need to be Verifactu-compliant?
The current deadlines under RDL 15/2025 are: 1 January 2027 for legal entities (companies, S.L., S.A., etc.) and 1 July 2027 for self-employed persons. This applies to invoicing software, not directly to accounting software. However, the practice must ensure that the software its clients use for invoicing will also be compliant on time. If the practice manages client invoicing from within Aplifisa (via FactuGes), that requirement is covered by the suite. Important: no software holds «AEAT approval»; the legal mechanism is the manufacturer's declaration of responsibility (RD 1007/2023).
Is it possible to migrate from a3ASESOR or Sage to Aplifisa without losing historical data?
Yes, although the scope of the migration depends on the data and the export formats available in the source system. In general, historical accounting and payroll records can be migrated using standard import tools. Tax returns filed in previous years remain in the old system (or in AEAT PDFs), but they do not need to be re-migrated: the new system starts with current-year data. The real complexity lies in configurations (customised chart of accounts, labour agreements, model templates), which require setup in the new system. A partner with experience in these migrations reduces transition time and errors.
Conclusion: the decision depends on your profile, not on rankings
There is no «best software for advisory firms» in the abstract. Aplifisa stands out for its comprehensive coverage of the practice cycle, its native OCR module, the built-in property management module and the TeamSystem group's backing for regulatory updates. a3ASESOR is the established benchmark with the greatest historical penetration and a tax depth that is hard to match. Sage is a valid option for client company accounting, but limited if the practice needs a complete tax and payroll suite.
If you are evaluating a software change or implementing from scratch in your practice, at Summum Sistemas we can help you analyse your specific situation without any catalogue bias. Contact us and we will evaluate together which solution best fits your operations, your team and your regulatory timelines.