If you manage payroll for several clients from a payroll advisory firm, you know the real cost is not in the software licence: it is in the hours lost correcting collective agreement errors, reconciling contributions with Social Security, or responding to Tax Agency requirements for incorrectly filed returns. Nominasol, the payroll module from TeamSystem/DELSOL, was built precisely for that context: firms managing payroll for dozens or hundreds of companies from a single installation. In this article we explain how to implement it in an orderly way, what needs to be configured before processing the first payslip, and how to avoid the most common mistakes at go-live.
What Nominasol is and who it is designed for
Nominasol is the payroll and social contributions software from Software del Sol (DELSOL), a brand integrated into the TeamSystem Group since 2021. It is designed for payroll advisory firms and SMEs that need to manage employment contracts, monthly payslips, income tax withholdings, Social Security contributions, and the associated fiscal and labour returns (111, 190, TC2 equivalents, SILTRA, NS Conect@).
Unlike general-purpose solutions, Nominasol allows working with multiple client companies from a single desktop environment, with each company in its own independent file. This is decisive for an advisory firm: you do not want to mix collective agreements, contribution rates, or employees from different legal entities.
An important point: Nominasol is a desktop application for Windows. There is no standalone native web version, although it can be combined with the DELSOL 360 cloud suite for those who want integrated remote access.
What Nominasol manages: key modules and features
Before planning the implementation it is worth understanding the actual scope of the software. The table below summarises the areas it covers:
| Area | What Nominasol does | Connection with official bodies |
|---|---|---|
| Payroll | Calculation of salaries, supplements, overtime, bonus payments, income tax withholdings, advances and final settlements | — |
| Social Contributions | Calculation of employer and employee contributions for contingencies, unemployment, FOGASA, training and occupational accidents/diseases | SILTRA (Direct Settlement System of the TGSS) |
| Social Security communication | Registration, deregistration and changes to employee data (AFI forms) | NS Conect@ (Social Security RED System) |
| Contracts | Drafting and management of contracts according to employment relationship type and applicable collective agreement | Contrat@ (SEPE) |
| Income tax and fiscal returns | Withholding calculation, generation of Form 111 (quarterly) and Form 190 (annual) | AEAT (by file or Immediate Supply) |
| Collective agreements | Updatable agreement database; salary tables by category and seniority | — |
| Sick leave and temporary disability | Management of temporary incapacities, company supplements and communication with the mutual insurance company | Sistema Delta (AT/EP), communication with mutual insurers |
Implementation phases in a payroll advisory firm
Implementing Nominasol in an advisory firm with several active clients is not simply a matter of installing the programme and opening files. There is a logical order to follow to avoid rework.
1. Preliminary analysis and loading of client companies
The first step is to take stock of the payroll clients you are going to manage: how many companies, how many employees per company, which collective agreements apply, and whether any company has specific features (special contribution rates, multiple employment, employees posted abroad, etc.).
With that map, company files are created in Nominasol: legal name, tax ID (CIF), contribution account code (CCC), occupational accident mutual insurer, and contribution scheme. The CCC data is critical: an error here will cause SILTRA to reject the files.
2. Configuration of collective agreements and salary tables
Nominasol includes a collective agreement database that must be reviewed and updated before processing the first payslip of the year. Each agreement has its own table of professional categories, minimum salaries, and three-year or five-year increments. If your client's agreement has revised tables published in the Official State Gazette (BOE) after the last programme update, you will need to enter them manually.
This is, by far, the point where the most errors occur in implementations without specialist support: applying the wrong agreement or the previous year's tables generates discrepancies that only surface when the TGSS cross-references the data in the contributions settlement.
3. Registration of employees and contracts
With the company files created and collective agreements configured, the next step is to register the employees. Nominasol allows data to be imported from Excel files or, if you were using another software, from the export format of the previous programme (in many cases via a structured CSV file).
For each employee the following is configured: professional category, contribution group, contract type, seniority date, calculated or fixed income tax withholding percentage, and whether overtime or other agreement-specific items apply.
4. Connection with SILTRA and NS Conect@
This is the technical core of the implementation. SILTRA is the General Treasury of Social Security (TGSS) system for submitting contribution settlements (formerly TC1/TC2). NS Conect@ (also known as the RED System) allows employee registrations, deregistrations and changes to be submitted electronically.
For Nominasol to connect correctly to both systems you need:
- The advisory firm's digital certificate authorised in the RED System (authorisation to act on behalf of the client).
- The installation and configuration of SILTRA (a separate, free programme from the TGSS) on the machine running Nominasol.
- Verification that each company's CCC is linked to your advisory firm's NAF at the TGSS.
Without this prior configuration, Nominasol can calculate payslips correctly but will not be able to submit the contribution files. This is a step many advisory firms postpone, which then causes a rush on the last day of the month.
5. Pilot payroll test and reconciliation
Before processing the first real month, it is worth running a test payslip with known data: one employee with an open-ended contract, fixed salary and no incidents. You verify that the contribution calculated by Nominasol matches what SILTRA shows when validating the file, and that Form 111 correctly reflects the withholding applied.
If something does not balance in this pilot phase, that is the time to correct it. Doing so in production, with dozens of payslips already processed, multiplies the work.
Migration from another payroll programme
If the advisory firm was working with another payroll software (a3nom from Wolters Kluwer, Sage Labour, Meta4 or another), migration requires a prior step: exporting historical data on employees, contracts and, if possible, the accumulated income tax and contributions for the current year.
Nominasol does not have a universal importer for all competitor formats, so migration typically involves:
- Exporting employee master data from the source programme to Excel or CSV.
- Adapting the structure to Nominasol's import format (template available from DELSOL).
- Manually entering the accumulated income tax and Social Security figures for the current year so that Form 111 and annual reports are consistent.
- Verifying against the contribution bulletins already submitted to the TGSS.
The ideal time to migrate is at year-end (January of the new year), when accumulated figures are at zero and the collective agreement parameters start fresh. Migrating mid-year is possible but requires more reconciliation work.
Nominasol in the DELSOL 360 ecosystem
Nominasol is not a standalone solution. Within the TeamSystem/DELSOL ecosystem it can be integrated with Contasol (accounting) for automatic payroll journal entries, and with Factusol (invoicing) if the advisory firm also manages its clients' invoicing. The DELSOL 360 suite integrates these three modules in a cloud environment that allows access from any device without depending on a local Windows installation.
For advisory firms with technicians working remotely or that want to offer their clients an employee portal (with access to payslips and withholding certificates without sending them by email), the cloud version is the natural option.
If you want to explore the full scope of what Summum Sistemas can implement and support in the TeamSystem/DELSOL ecosystem, visit our Nominasol service page, where we detail the support and training plans for payroll advisory firms.
Common mistakes at go-live and how to avoid them
We have been supporting advisory firms in the digitalisation of their payroll processes since 2007. These are the problems we see most frequently in Nominasol implementations without specialist support:
- Collective agreement configured without the latest salary revision: generates contribution discrepancies that the TGSS detects in the monthly settlement.
- Incorrect CCCs or not properly linked to the advisory firm's NAF: SILTRA rejects the file and corrections must be made before the period closes.
- Expired or unauthorised digital certificate in RED: blocks the submission of registrations and deregistrations at the worst possible moment.
- Accumulated income tax figures not loaded during a mid-year migration: the annual Form 190 does not match the already submitted 111 returns.
- Not backing up the files before updating Nominasol: major programme updates may require database conversion; if something fails without a backup there is no way back.
Ongoing support: why it matters more than installation
Employment legislation changes frequently: collective agreements being revised, new additional contributions, changes to the RED System, SILTRA updates. A payroll programme that is not kept up to date can become a liability rather than an asset.
As an Official TeamSystem Partner, at Summum Sistemas we do not just implement Nominasol: we support the advisory firm through the first monthly close, verify that SILTRA files are submitted correctly, and offer a priority support channel for any issues that arise afterwards.
If your advisory firm is evaluating Nominasol, migrating from another system, or needs someone to configure the environment from scratch, contact our Systems team. We have offices in Valladolid, Burgos, Palencia, Aranda de Duero and Las Palmas.
Frequently asked questions
Does Nominasol work on Mac or Linux?
Not natively. Nominasol is a desktop application designed exclusively for Windows. It can run on Mac or Linux via virtualisation (Parallels, VMware, Wine), but this is not an officially supported configuration by DELSOL. For cross-platform access, the alternative is the DELSOL 360 cloud suite.
How many companies can Nominasol manage at the same time?
There is no fixed technical limit published by DELSOL on the number of client companies per installation. In practice, payroll advisory firms with more than a hundred managed companies use Nominasol without performance issues, provided the machine meets the minimum hardware requirements. What does vary depending on the subscription plan is the total number of active employees.
Is Nominasol already adapted to changes in the RED System and the new SILTRA?
DELSOL publishes periodic Nominasol updates to adapt it to regulatory and technical changes in the Social Security RED System. It is the responsibility of the user (or their support partner) to keep the programme updated to the latest version before each monthly settlement. Having an active support plan ensures you receive updates and change alerts without having to monitor them manually.
What is the difference between Nominasol and the Aplifisa Labour Suite?
Both are TeamSystem solutions for payroll management in professional firms, but with different profiles. Nominasol (DELSOL) is more accessible for small-to-medium advisory firms with a shorter learning curve. Aplifisa Labour Suite, developed in Salamanca since 1983, is aimed at professional firms with higher volumes or more complex needs: it also integrates practice management, an advanced employee portal, and fiscal modules in the same platform. If your advisory firm needs help choosing between the two, at Summum Sistemas we can help you evaluate the options with no commitment.