Corporate Income Tax: Complete Guide for Companies and SMEs [2026]

Some taxes are paid without being fully understood. For many companies, Corporate Income Tax (CIT) is one of them. It is filed, paid, and forgotten until the following year. The problem is that this approach has a real cost: unused deductions, non-optimized tax rates, and missed deadlines due to lack of planning.

This guide exists to prevent that. It is not a technical manual for advisors, but a clear and comprehensive explanation of how CIT works—who pays it, how much, when, and most importantly, what you can do to manage it effectively.

 

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What is Corporate Income Tax?

Corporate Income Tax (CIT) is a tax levied on the profits earned by legal entities resident in Spain. In other words, if your company generates income, that income is subject to CIT.

Its logic is similar to Personal Income Tax (PIT) for individuals, but applied to entities. While a self-employed individual reports income under PIT, a company reports under CIT. They are governed by different rules, have different tax rates, and choosing between operating as a sole trader or a company has tax implications that should be carefully assessed.

CIT is regulated by the Corporate Income Tax Law and its implementing regulations. The starting point is always the company’s accounting profit: income minus expenses. From there, tax adjustments are applied, the relevant tax rate is used, and applicable deductions are subtracted.

Who must pay Corporate Income Tax?

All legal entities resident in Spain are subject to CIT, as well as certain entities without legal personality.

A company is considered resident in Spain if it meets at least one of the following criteria:

• It is incorporated under Spanish law.
• Its registered office is in Spain.
• Its place of effective management is in Spain.

Entities subject to CIT

• Commercial companies (SA, SL, SLU, partnerships, etc.)
• Civil law companies with a commercial purpose
• Cooperatives and agricultural transformation companies
• Economic Interest Groupings (EIG)
• Temporary Business Associations (UTE)
• Investment, pension, venture capital, securitization and guarantee funds
• Foundations and public/private institutions (for non-exempt income)
• Public business entities

Exempt and partially exempt entities

• Fully exempt: the State, regional governments, local authorities, the Bank of Spain, Social Security, etc.
• Partially exempt: foundations, public-interest associations, professional bodies, unions, political parties—taxed only on non-exempt income

A common question: do civil companies pay CIT or PIT?
It depends. If they carry out commercial activities, they pay CIT. If not, income is attributed to partners under PIT.

CIT tax rates in 2026

Recent legislation introduces significant changes, especially for SMEs and micro-enterprises.

Current rates in 2026

Roadmap for SMEs and micro-enterprises

The law establishes a progressive reduction for smaller companies:

SMEs (< €10M turnover):

• 2025: 24 %
• 2026: 23 %
• 2027: 22 %
• 2028: 21 %

Micro-enterprises (< €1M):

• 2025: 21% / 22%
• 2026: 19% / 21%

This has direct implications for tax planning. If your company is close to one threshold or another, it is worth reviewing how you structure your income.

How to calculate Corporate Income Tax

The calculation of CIT is not as opaque as it may seem. It follows a clear logic, although the specific details may vary depending on the company.

General structure

Accounting profit (income – expenses)
+ Positive tax adjustments
– Negative tax adjustments
= Tax base before offsets
– Loss carryforwards
= Taxable base
× Tax rate
= Gross tax liability
– Deductions
= Net tax liability
– Withholdings and instalments
= Final tax payable/refundable

Example

Let’s assume a limited company with:

• Turnover: €800,000 (micro-enterprise)
• Accounting result: €90,000

Step 1 — Taxable base:

• Accounting result: €90,000
• Non-deductible expense: +€500
• Accelerated depreciation: –€8,000
• Preliminary base: €82,500
• Previous losses: €0
• Taxable base: €82,500

Step 2 — Apply rate:

• €50,000 × 19% = €9,500
• €32,500 × 21% = €6,825
• Gross tax: €16,325

Step 3 — Deductions:

• Employment deduction: –€1,200
• Net tax: €15,125

Step 4 — Advance payments:

• Instalments: –€6,000
• Final tax payable: €9,125

Each company has its own specifics, but this structure is always the starting point.

Key deductions and incentives

One of the most underused tools in CIT is deductions—not because they are unknown, but because they require prior planning.

Key deductions include:

• R&D and innovation: up to 25% / 12%
• Employment of disabled workers: €9,000–€12,000 per employee
• Audiovisual production incentives
• Investment in startups (business angels): 20% deduction
• Donations and sponsorship
• Capitalization reserve (20% reduction of equity increase)
• Leveling reserve (SMEs only)

Instalment payments (Form 202)

CIT is not only paid in July. Companies make advance payments during the year.

Deadlines

• April
• October
• December

Calculation methods

• Based on previous tax
• Based on current year result

Annual return: Form 200

All entities must file it, even if inactive.

Deadline

• July 1–25 (calendar year companies)

Filing method

Online via the Tax Agency website.

Form 220

Used for tax groups under consolidation.

Tax refunds

If payments exceed final liability, the Tax Agency refunds the difference within six months.

Tax losses

Losses can be carried forward indefinitely, subject to limits:

• General: 70% of taxable base
• Large companies: 50% or 25%
• Minimum €1M always offsettable

CIT vs PIT: when to incorporate

• PIT: progressive up to ~47%
• CIT: flat/reduced rates (19–25%)

From around €40,000–€50,000 profit, a company is often more efficient.

But consider:

• Dividend taxation
• Director’s salary
• Administrative costs

Tax planning

Key actions before year-end:

• Review depreciation
• Apply capitalization reserve
• Apply leveling reserve
• Accelerate deductible expenses
• Review related-party transactions

Do you want to close the financial year with peace of mind? Let’s talk about how we can support you through the tax closing process.

FAQs

Do startups have reduced rates?

Yes, 15% in the first two profitable years.

What happens if I file late?

Surcharges or penalties apply.

Are dividends taxed?

Yes, but with exemptions to avoid double taxation.

Can a loss-making company pay tax?

Yes, in some cases (minimum taxation rules).

How long can losses be carried forward?

Indefinitely.

What is the SME regime?

A set of tax benefits for companies with turnover below €10M.

How Adlanter supports you

CIT is one of the taxes with the greatest room for legal optimization—and also one of the riskiest if mismanaged. The difference between doing it properly and missing deductions can amount to thousands of euros per year.

At Adlanter, we manage Corporate Income Tax for companies of all sizes, from newly created entities to complex corporate groups. Our tax advisory team works throughout the year—not just in July—because the best time to optimize tax is before the year closes.

If you have doubts about your specific situation, we’re here to help. No jargon, no fine print. Speak with our tax team.