If you need to review how the 2026 Social Security deregistrations affect you, you can write to Fernanda Vargas on WhatsApp or book an appointment on her Calendly. This article provides general legal information on the changes that came into force on August 1, 2026, and may serve as a practical guide if you are a company, an advisory firm, or a self-employed person with staff.
What changed on August 1, 2026: Royal Decree 643/2026 at a glance
Since August 1, 2026, Royal Decree 643/2026, of July 29, has been in force. It amends two important parts of the Social Security (Seguridad Social) regulations: on the one hand, the rules on company registration and on affiliation, registrations, deregistrations, and changes to data; on the other, the rules on collection and deferral of debts owed to the General Treasury of the Social Security (Tesorería General de la Seguridad Social).
The practical changes can be grouped into three areas:
- The time limit for reporting deregistrations and changes to employees’ data is extended from three to six calendar days.
- A new obligation is imposed to provide information on the CNO for staff already registered, unless that information had already been reported.
- The rules on deferral of debts are adjusted, clarifying which contributions cannot be deferred and revising the guarantee thresholds, the treatment of small debts, and interest.
In addition, one key point should be kept in mind: not everything changes. Registration must still be completed before the start of services and may be processed up to sixty calendar days in advance. In other words, the extension of the time limit affects deregistrations and changes to data, but it does not make registration a later or flexible formality in relation to the actual start of the activity.
In practice, this extension of the time limit has been viewed as an improvement for labor management, especially in environments with high turnover, because it reduces the pressure of having to submit reports within very short periods. Even so, extending the time limit does not eliminate the need to report correctly and without errors.
The new six-calendar-day time limit for deregistrations and changes to data
The main change introduced by Royal Decree 643/2026 concerns the time limit for filing applications for deregistration and changes to employees’ data. Where the time frame used to be three days, it is now six calendar days.
Applications for deregistration and changes to workers’ data must be submitted within six calendar days.
There are two important nuances in this change:
- They are calendar days, not business days.
- The calculation is made from the termination or from the moment when the change occurs.
This means that weekends and public holidays count within the time limit. For that reason, even though the new time frame is longer, it is still advisable not to leave it until the last minute. In day-to-day management, leaving reports until the last day increases the risk of clerical errors, technical issues in online filing, or discrepancies between the actual date of the event and the date ultimately reported.
For companies and law firms, this change is useful because it provides more breathing room when several deregistrations or several changes occur within a short period. But that additional margin should not be confused with authorization to report late on a systematic basis. If the report is submitted late or is incorrect, the company may incur Social Security liability under labor penalty regulations, so each specific case should be reviewed.
In practical terms, the change makes it advisable to review internal protocols: who reports, when the termination or change is recorded, how the correct date is checked, and what control system is used so that no files are left pending. The new time limit helps, but traceability remains essential.
What Does NOT Change: Registration Must Still Be Before the Start of the Activity (and up to 60 Days Before)
One of the most common mistakes after a reform is to think that everything has become more flexible. That is not the case. Royal Decree 643/2026 does not change the basic registration rule: registration must still take place before the start of services.
The maximum advance period does not change either: registration may still be reported up to sixty calendar days before the start of the activity.
Accordingly, the correct picture is as follows:
- Registrations: they must still be completed before work begins and may be filed up to 60 calendar days in advance.
- Deregistrations: they now have 6 calendar days from the termination date.
- Changes to data: they now have 6 calendar days from the moment the change occurs.
This reminder is important because the extension of the time limit affects only certain actions. If a company misinterprets the reform and stops processing registration before the actual start date, it will still be acting outside the required rule.
In practice, it is advisable to clearly separate workflows: one for prior registrations and another for deregistrations and changes within the new six-calendar-day time limit. That separation avoids conceptual errors and improves compliance.
New obligation: report the occupational classification code (CNO) for the entire workforce
The reform is not limited to time limits. It also introduces a specific obligation for companies: to report to the General Treasury of the Social Security the occupational classification code of employees who are already registered, unless that information had already been reported.
The time limit to comply with this obligation is six months from the entry into force of the regulation. Since the royal decree came into force on August 1, 2026, the practical deadline runs approximately until February 1, 2027.
This is not a minor or merely statistical piece of information. This coding makes it possible to better identify certain occupations, including arduous or hazardous ones, for purposes including, among others, the reduction coefficients applicable to retirement age.
For many companies, this obligation will require reviewing the situation of the entire registered workforce and checking whether the CNO is already on record or must be added. In other words, it is not enough to wait for new hires: companies must also look inward and validate the information already on file.
From a compliance perspective, it is advisable to work from an organized list of registered employees and verify, one by one, whether the code has already been reported. That check is especially important where there have been organizational changes, internal reclassifications, or several people managing the same company before Social Security.
- Review the workforce shown as registered on August 1, 2026.
- Check whether the CNO is already on record in each case.
- If it is not, plan the report within the six-month period.
- Keep an internal record of what has been reported to avoid duplicates or gaps.
Deferral of Social Security debts: non-deferrable contributions and new thresholds
Royal Decree 643/2026 also changes the rules on deferral of debts owed to the General Treasury of the Social Security. Here, great precision is needed, because not everything can be deferred and the new thresholds heavily affect payment strategy.
Which contributions cannot be deferred
The regulation expressly clarifies that the following cannot be deferred:
- Contributions corresponding to the employee’s contribution.
- Contributions for work accident and occupational disease contingencies.
This point is essential because it prevents deferral applications from being made as if the entire debt were subject to the same treatment. Before requesting a deferral, it is necessary to separate which part of the debt can actually be included in that request and which part is excluded.
When guarantees are not required
The reform also revises the guarantee thresholds. Guarantees are not required in the following cases:
- When the total deferred debt is equal to or less than 150,000 euros.
- When it is less than 250,000 euros, provided that at least one third is paid within ten days and the rest is spread over a maximum of two years.
Therefore, when considering a deferral, it is not enough to look only at the total amount owed: it is also necessary to assess whether that initial one-third payment can be made within ten days and whether the remainder fits within a maximum two-year schedule.
What happens with small debts
The regulation provides that deferrals are denied when the amount of the debt is less than the monthly national minimum wage, set at 1,221 euros per month in 2026, except in cases of automated processing.
This makes it necessary to be very precise before filing the application. If the debt is below that threshold, it will be necessary to check whether the case does or does not fall within automated processing; otherwise, the application will not succeed.
Interest on the deferral
Interest on the deferral is tied to the current legal interest rate. In addition, where the obligation to provide guarantees is waived due to extraordinary circumstances, a two-point increase applies.
If a company is considering requesting a deferral, the prudent course is to review the exact composition of the debt, the total amount, whether there are non-deferrable items, whether a guarantee will be required, and what financial cost may be involved. In that analysis, Fernanda Vargas, employment lawyer in Madrid, can help you.
Why this matters especially to foreign workers
The correct management of registrations, deregistrations, and changes to data is important for any worker, but it is especially sensitive in the case of foreign workers. The reason is very practical: those company reports feed into the employment history report (informe de vida laboral), which is a key document for proving work activity.
That report is often decisive in procedures such as renewals of residence and work permits and access to long-term residence. When a company reports late, reports incorrectly, or fails to record a relevant incident, it is not only the company that suffers the consequences: the worker does too, and may end up with an incomplete or inconsistent employment history report just when they need to prove their work record.
An error in dates, a deregistration filed late, or a change to data recorded incorrectly can lead to doubts about periods actually worked. And when the foreign national depends on their employment record to maintain or strengthen their administrative status in Spain, those discrepancies become much more important.
For that reason, for companies that hire foreign workers, Social Security compliance is not just a formal obligation. It is also an issue that can directly affect the documentary and administrative stability of their workforce.
- The employment history report must correctly reflect periods of work activity.
- The registration and deregistration dates must match the reality of the services provided and of the termination.
- Any changes to data that must be recorded must be reported within the legal time limit.
- If errors appear, they should be reviewed as soon as possible to prevent them from carrying over into a future immigration procedure.
If you are a foreign worker and detect inconsistencies in your employment history report, or if you are an employer and want to review whether your reports may affect residence or long-term residence procedures, it may be useful to consult Fernanda Vargas, who works in both immigration and labor and Social Security matters.
Timeline of key dates and checklist for companies and advisory firms
To make the reform concrete, this is the basic timeline to keep in mind.
| Date | Milestone | What it means in practice |
|---|---|---|
| July 30, 2026 | Publication in the BOE | Royal Decree 643/2026 is published. |
| August 1, 2026 | Entry into force | The new 6-calendar-day time limit for deregistrations and changes to data begins to apply, along with the rest of the changes. |
| From August 1, 2026 | 6-calendar-day time limit | Deregistrations and changes to data must be reported within that time limit from the termination or from the change. |
| Approximately until February 1, 2027 | Reporting the CNO for registered staff | Companies must report the CNO of registered employees, unless it had already been reported. |
And this is a useful checklist for companies, advisory firms, and self-employed persons with staff:
- Update your internal protocols to reflect that deregistrations and changes now have a 6-calendar-day time limit.
- Do not change the registration protocol: registration must still take place before the start of the activity and may be processed up to 60 calendar days beforehand.
- Keep track of the calculation in calendar days, including weekends and public holidays.
- Review the registered workforce and check whether the CNO is already on record in each case.
- Plan the filing or review of the CNO within the six months following August 1, 2026.
- Check the composition of any debt before requesting a deferral.
- Separate the non-deferrable items, especially the employee’s contribution and the contributions for work accident and occupational disease.
- Verify the guarantee thresholds and whether you can meet the one-third payment within ten days where applicable.
- Avoid filing deferral applications for debt below the monthly national minimum wage without first checking whether the case falls within automated processing.
- Cross-check the employment history report in sensitive situations, especially where there are foreign workers whose future documentation depends on the correct traceability of their employment.
When a company has volume, turnover, or a workforce with different administrative situations, a preventive review is usually far more efficient than correcting issues afterward. If you need to organize processes or review risks, Fernanda Vargas, employment lawyer in Madrid, can help you analyze your case.
Frequently Asked Questions
From when does the new six-day time limit apply?
It applies from August 1, 2026, the date on which Royal Decree 643/2026 entered into force.
Are the six days business days or calendar days?
They are calendar days. Therefore, weekends and public holidays also count.
Can registration still be reported after the person starts working?
No. Registration must still take place before the start of services. What remains unchanged is the possibility of processing it up to a maximum of sixty calendar days in advance.
Does the CNO have to be reported for the entire workforce?
Yes, with respect to employees who are registered, unless that information had already been reported. The time limit is six months from the entry into force of the regulation.
Can all Social Security debts be deferred?
No. The regulation expressly clarifies that the contributions corresponding to the employee’s contribution and the contributions for work accident and occupational disease contingencies cannot be deferred.
What happens if a deregistration or a change to data is reported late or with errors?
There may be company liability in Social Security matters under the regulations on labor infringements and penalties. The classification and specific scope depend on the case, so it is advisable to review it in detail if an issue has already arisen.
Why can this change especially affect foreign workers?
Because the registrations, deregistrations, and changes reported by the company make up the employment history report, and that document is key to proving work activity in residence and work permit renewals and in access to long-term residence. If there are errors or omissions, the worker may face problems proving their record.
Conclusion: general information, not individualized legal advice
The August 2026 reform sends a clear message: there is more time to report deregistrations and changes to data, but precision, control of time limits, and proper traceability of employment information remain essential. In addition, there is a new obligation regarding the CNO for registered staff, and the rules for requesting deferrals of Social Security debts are refined. This content is general information and does not replace the individualized analysis of a specific situation. If you want to review your case with Fernanda Vargas, you can write to her on WhatsApp or book an appointment on Calendly.