Update, 6 October 2026. What now has a firm date is mandatory B2B e-invoicing: Order HAC/1028/2026, in force since 6 October 2026, has started the deadlines of Royal Decree 238/2026 (twelve months for businesses with a turnover above €8 million and twenty-four for everyone else, i.e. October 2027 and October 2028 by our calculation). Spain's Ministry of Finance has announced that it will postpone VeriFactu to October 2028 so that it converges with e-invoicing, but that change is not yet in the BOE (Official State Gazette): until it is published, the dates set by Royal Decree-Law 15/2025 remain in force (1 January 2027 for Corporate Income Tax filers and 1 July 2027 for everyone else). We will update this page once the regulation is published.
TeamSystem is now the largest Italian management software group for SMEs, with over 3.1 million clients and nine established brands in Spain. As an Official TeamSystem Partner, Summum Sistemas handles implementation, migration and technical support for the entire ecosystem — Factusol, Contasol, Nominasol, Aplifisa, DELSOL 360 and more — so your company or accounting firm gets maximum value from day one.
In February 2021, TeamSystem S.p.A. — founded in Italy in 1979 with an approximate turnover of 1.15 billion euros in 2025 — acquired Software del Sol (DELSOL) and began an expansion in Spain that has since added eight further acquisitions: Billin, Aplifisa, Distrito K, Golden Soft, Quipu and AIG Classic, among others. The result is an ecosystem covering everything from the simplest invoicing for a freelancer (Billin, Factusol) to advanced accounting for a professional firm (Contasol, Aplifisa) and distribution or manufacturing ERP (Distrito K). Summum Sistemas, with nineteen years of experience in management software implementation, acts as a specialist consultancy across the entire catalogue.
One of the most pressing drivers of demand is Verifactu. Royal Decree-Law 15/2025 sets 1 January 2027 as the deadline for legal entities to use compliant invoicing systems; self-employed professionals have until 1 July 2027. Compliance is not obtained through an 'AEAT approval' — a concept that does not exist — but through the manufacturer's declaration of conformity provided for in RD 1007/2023. Factusol, Billin and Aplifisa's FactuGes module already incorporate Verifactu. If your company uses any of these products and has not yet completed the migration or configuration, the window is narrowing: acting in 2025–2026 avoids last-minute pressure and the risk of non-compliance.
For accounting firms and professional practices, Aplifisa — based in Salamanca with more than 35 years of history (TeamSystem), and present in approximately 10% of the advisory software market — offers a tax suite (Personal Income Tax, Corporate Tax, VAT, official forms), a payroll suite (payroll, Social Security, SEPE), accounting with SII, FactuGes with Verifactu, OCR via ApliScan and an employee portal. Summum Sistemas implements and supports the entire Aplifisa suite with the same team that handles the rest of the TeamSystem ecosystem, simplifying communication and speeding up incident resolution. If the practice prefers the Wolters Kluwer ecosystem instead of TeamSystem, we implement a3innuva with the same guarantees.
We analyse your current software, data volumes (invoices, accounting entries, payroll), existing integrations and your situation regarding Verifactu or SII. We deliver a report with the implementation or migration path, timelines and risks.
We install and configure the chosen TeamSystem product: financial year setup, chart of accounts, invoicing series, SII connection or Verifactu activation, and import of master data and historical balances from the previous system (including migrations from ContaPlus/Sage 50 to Contasol).
We train key users using real business scenarios: purchase and sales workflows in Factusol, tax return preparation in Contasol, payroll and Social Security calculations in Nominasol. We accompany you through the first closing or the first declaration to make sure everything goes smoothly.
Once live, we provide technical and functional support: version updates, incident resolution, adjustments for regulatory changes (new AEAT forms, collective agreements, income tax tables) and an annual review of the environment to identify improvements.
The operational detail: what we deliver as part of the work and what we keep alive afterwards.
Factusol — Invoicing and stock
Factusol implementation for SMEs and retailers: catalogue configuration, pricing, Verifactu invoicing series, warehouse control and TPVSOL integration. Cloud plans from approximately 19.50 EUR/month (manufacturer's indicative pricing, subject to change).
Contasol — Professional accounting
Migration from ContaPlus or other systems to Contasol, general chart of accounts configuration, SII, VAT/income tax/corporate tax forms and annual accounts. Includes training in the complete accounting workflow for firms and SMEs.
Nominasol — Payroll and Social Security
Nominasol setup for payroll management, SS Conect@/SILTRA, contracts, income tax withholding and collective agreements. Support at critical milestones: monthly closings, forms 111/190, year-end closing.
Aplifisa — Suite for professional firms
Full Aplifisa suite implementation and support: tax (Personal Income Tax/Corporate Tax/VAT), payroll (payroll/Social Security/SEPE), accounting with SII, FactuGes with Verifactu and ApliScan OCR. Ideal for practices seeking total integration on a single platform.
DELSOL 360 and Billin
DELSOL 360 configuration (integrated cloud suite combining Factusol+Contasol+Nominasol) and Billin setup for freelancers and micro-businesses needing lightweight online invoicing with Verifactu support. Billin plans from approximately 6.60 EUR/month (manufacturer's indicative pricing).
Verifactu migration before the deadline
Dedicated Verifactu compliance service for companies and firms already using Factusol, Billin or Aplifisa: audit of the current configuration, version update, VERI*FACTU record generation testing and verification of the manufacturer's declaration of conformity (RD 1007/2023).
TeamSystem software implementation is complemented by legal advice on e-invoicing and Verifactu from Summum Consultoría, and by ERP data AI copilot capabilities from Summum IA.
When implementing Contasol or Aplifisa raises questions about GDPR, SII or the legal scope of electronic invoicing, Summum Consultoría covers the regulatory angle.
View service → iaFirms working with Aplifisa or Contasol can add an AI copilot that speeds up declaration review, extracts data from invoices and answers queries about client records.
View service → sistemasDedicated Verifactu compliance service for any management software, including TeamSystem products not yet covered by automatic manufacturer updates.
View service →Not necessarily. If you already use Factusol, Billin or Aplifisa (FactuGes), the manufacturer has updated those products to be compliant through a declaration of conformity (RD 1007/2023). What you do need is to update to the correct version and configure the system properly. Summum Sistemas handles that update and the pre-deadline testing: 1 January 2027 for legal entities, 1 July 2027 for self-employed professionals.
Yes. Summum Sistemas is an Official TeamSystem Partner, which accredits us directly with the manufacturer to implement, migrate and support the entire DELSOL ecosystem: Factusol, Contasol, Nominasol, Aplifisa, Billin, DELSOL 360 and Distrito K. We have been working with management software for SMEs and professional firms in Castilla y León and the Canary Islands since 2017. Official Partner status gives us direct manufacturer support, certified training, early access to new versions and a direct escalation channel for complex incidents.
Yes. Migration from ContaPlus (now Sage 50) to Contasol is one of our most common projects. It includes exporting the chart of accounts, historical entries, opening balances, client and supplier records, and verifying that everything reconciles after the import. The process typically takes one or two days for a company with a normal volume of accounting entries.
Yes. Contasol includes an SII (Immediate Information Supply) module for companies subject to it — those exceeding 6 million euros in annual turnover or those voluntarily enrolled. SII and Verifactu are mutually exclusive regimes under current regulations: companies under SII are not required to adopt Verifactu. Summum Sistemas configures and maintains both modalities.
Aplifisa is designed to manage multiple companies from a single environment, which is exactly the working model of an accounting firm. Summum Sistemas implements the complete suite — tax, payroll, accounting and FactuGes with Verifactu — and trains the practice team in multi-client workflows, including bulk tax return submission and the use of ApliScan OCR to speed up document processing.