Correcting R&D&I tax deductions in Form 200 for 2024
R&D&I tax deductions: new procedure to correct Form 200 for 2024
Companies that did not correctly include their tax deductions for research, development and technological innovation activities in their 2024 Corporation Income Tax return now have a new procedure to correct the tax return for that financial year.
The main change is the incorporation of the corrective self-assessment procedure into Form 200. This new mechanism allows companies to correct, complete or modify a 2024 Form 200 return by submitting a new self-assessment for that year. As a general rule, this applies regardless of whether the correction is favourable to the company or to the Tax Administration.
This change is especially relevant for companies that generated R&D&I tax deductions in 2024 but did not include them in the tax return for the year in which they originated.
When should R&D&I tax deductions be corrected?
The procedure depends on when the Corporation Income Tax self-assessment for the year in which the deduction was generated was filed.
Self-assessments filed after 24 June 2022
When the self-assessment was filed after 24 June 2022, the R&D&I deduction must have been included in the tax return for the year in which it was generated.
If the company omitted the deduction, it must correct the self-assessment for that year within the legal four-year period in order to secure the right to apply it later. However, no correction will be necessary when the deduction had already been correctly declared and only remained pending for application in future years.
As a general rule, for companies whose financial year coincides with the calendar year, this criterion applies to deductions generated in 2021 and subsequent years.
Self-assessments filed before 24 June 2022
For self-assessments filed before that date, the criterion is different.
R&D&I tax deductions may be recognised and applied in a later tax return, even if they were not initially included in the year in which they originated, provided that the company can prove their existence, origin and amount.
For this reason, it is essential to keep all supporting documentation. This includes technical and financial reports, deduction base calculations, invoices, accounting records, reasoned reports where available, and any other evidence that can prove the activities carried out and the associated expenses.
What changes for the 2024 financial year?
The method used to correct the declared information will depend directly on the tax period that the company intends to amend:
- Financial years 2021, 2022 and 2023: in these cases, the procedure is managed through a correction request submitted via the AEAT Electronic Register, attaching the technical and financial documentation that justifies the change.
- Financial year 2024: companies must use the corrective self-assessment for Form 200. This procedure, established by Order HAC/657/2025, applies to tax returns whose periods fall within the 2024 calendar year.
This new mechanism simplifies the previous process, which required companies to distinguish between supplementary self-assessments and correction requests. Now, the company can include the changes directly in a new tax return, making it easier to regularise its tax incentives.
How is the 2024 corrective self-assessment submitted?
The procedure is completed electronically through Sociedades WEB:
- Access the previously submitted tax return for the 2024 financial year.
- Select the “Modify tax return” option.
- Go to the section for the corrective self-assessment.
- Tick the “Corrective self-assessment” box.
- Enter the reference number of the previous self-assessment.
- Indicate the reason for the correction.
- Enter the correct amount of the R&D&I tax deduction in the relevant boxes.
- Validate and submit the new self-assessment.
The Spanish Tax Agency states that the previous tax return must be expressly identified and that at least one reason for the correction must be indicated.
When the company only intends to recognise the deduction generated, without applying it at that time or changing the result of the tax return, the amount may be left as pending for application in future periods. In addition, it is recommended to provide an explanatory statement and the supporting documentation once the corrective self-assessment has been submitted.
The four-year deadline: a key point
Companies should review the deductions generated in recent years as soon as possible and check whether they were correctly included in the corresponding tax returns.
In the case of a company whose financial year coincides with the calendar year and that filed Form 200 for 2021 within the general voluntary filing period, the four-year deadline to request a correction may end on 25 July 2026. This date should be assessed individually when the return was filed late or when the tax period did not coincide with the calendar year.
An early review makes it possible to detect potential omissions, correct the tax return through the appropriate procedure and prevent the deadline for securing the right to the deduction from expiring.
What should companies review?
Before submitting a correction, companies should check:
- In which financial year the deduction was generated.
- When the self-assessment for that year was filed.
- Whether the deduction was already recorded as generated or pending application.
- What amount needs to be included.
- Whether the correction changes the result of the tax return.
- Which technical, financial and tax documentation can support the deduction.
Each case should be analysed individually, especially when the company’s financial year does not coincide with the calendar year or when several tax returns have been submitted for the same period.
Act now to protect your R&D&I tax deductions
The new corrective self-assessment simplifies the procedure for correcting Form 200 for the 2024 financial year. However, it remains essential to correctly identify the year in which the deduction originated, the applicable procedure and the available deadline.
Our team can help you review the R&D&I tax deductions generated, check whether they were correctly declared and define the necessary steps to regularise your situation.
