The 2025 fiscal year-end arrives with a distinguishing feature: B2B e-invoicing is now universal, which means the company's tax information is more structured and verifiable than ever before — but also that discrepancies between electronic records and filed returns will be more easily detectable by the AEAT. This context makes year-end tax planning in 2025 as much a matter of precise compliance and documentation as of tax optimisation.
New Deductions Specific to the 2025 Close: Digitalisation and Green Assets
The 2025 fiscal year introduces two new corporate tax credits of particular relevance for companies that have made investments in digital transformation or sustainability:
Digitalisation deduction (15% tax credit)
Investments in certified business management software, AI solutions applied to production processes and advanced cybersecurity systems generate a 15% tax credit, capped at 10% of the adjusted gross tax liability. To apply this deduction, the solution must be certified by the competent body, the investment must have been brought into operational use before 31 December 2025, and the productivity impact or cost reduction must be documented in a technical report.
Green asset investment deduction (10%-15% tax credit)
Investments in equipment, technologies or installations that reduce the company’s CO₂ emissions generate a 10% credit, extendable to 15% for companies with an approved decarbonisation plan verified by IDAE. Environmental impact documentation — certified carbon footprint or report per ISO 14064 standard — is a mandatory requirement. Both deductions can be combined with the R&D&I deduction, provided they relate to distinct investments.
Transfer Pricing: Mandatory Review Before Year-End
The AEAT’s announced intensification of transfer pricing controls makes the review of related-party transaction policy and documentation a priority before 31 December:
- Updating the transfer pricing study: Market conditions in 2025 may differ from those underpinning the prior year’s benchmarking analysis. Comparables must be updated annually.
- Reviewing actual flows against documented policy: Any changes during 2025 in related-party transaction flows — new intragroup contracts, changes in functions and risks, modifications to interest or royalty pricing — must be reflected in updated documentation.
- Intragroup financing: Loan agreements between related parties must specify market interest rates, terms, collateral and conditions comparable to third-party arrangements to withstand inspection scrutiny.
Corporate Tax: Classic Levers for 2025
The structural CIT measures retain their effectiveness:
Capitalisation Reserve (Article 25 LIS): A 10% reduction of the net equity increase, with the requirement to maintain the reserve for five years. For 2025, the calculation must account for the fact that dividend distributions planned in 2026 from 2025 profits will reduce the net increase and therefore the reserve calculation base.
Levelling Reserve for SMEs (Article 105 LIS): A reduction of up to 10% of taxable income (maximum €1 million) for entities with turnover below €10 million. The deferral always has a positive economic value given the time value of money.
Accelerated depreciation: New assets acquired before 31 December by ERD-regime entities can be depreciated at double the maximum table rate. IT equipment worth €100,000 acquired in December 2025 can generate up to €50,000 of tax-deductible depreciation in the 2025 fiscal year itself.
R&D&I deduction (Article 35 LIS): Rates of up to 42% on R&D expenditure exceeding the two-year average. Technical documentation and, where applicable, a binding qualified opinion from the Ministry of Science are the strongest protection in an inspection.
Personal Income Tax and Contributions: Optimisation for Partners and Key Employees
For working partners and variable-pay employees, the fourth quarter provides the following planning opportunities:
- Tax-exempt benefits in kind: Private health insurance (up to €500 per beneficiary per year), meal vouchers (up to €11 per working day) and collective transport (up to €1,500 per year) are IRPF-exempt and CIT-deductible.
- Company pension plan contributions: Limit of €1,500 personal contributions plus €4,250 employer contribution to occupational pension plans. Additional contributions up to €8,500 are possible where there is an equivalent or greater employer contribution.
- Irregular income: Bonuses with a generation period exceeding two years benefit from the 30% IRPF reduction, significantly lowering the effective tax rate.
VAT Close and E-Invoicing Reconciliation
With the universalisation of e-invoicing in 2025, the Q4 VAT close requires a complete reconciliation between the electronic issued and received invoices register — now generated in structured format and accessible to the AEAT — and the amounts declared in Modelo 303. Any discrepancy between the electronic invoice register and the quarterly return can trigger an automatic supplementary assessment. This reconciliation must be completed before the Q4 Modelo 303 is submitted, with a filing deadline of 30 January 2026.
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